X-Git-Url: http://nitlanguage.org

diff --git a/c_src/parser_prod.sep.4.c b/c_src/parser_prod.sep.4.c
index 012ddca..6793291 100644
--- a/c_src/parser_prod.sep.4.c
+++ b/c_src/parser_prod.sep.4.c
@@ -1,4 +1,329 @@
 #include "parser_prod.sep.0.h"
+/* method parser_prod#ASuperExpr#n_kwsuper= for (self: ASuperExpr, TKwsuper) */
+void parser_prod__ASuperExpr__n_kwsuper_61d(val* self, val* p0) {
+val* var_node /* var node: TKwsuper */;
+var_node = p0;
+self->attrs[COLOR_parser_nodes__ASuperExpr___n_kwsuper].val = var_node; /* _n_kwsuper on <self:ASuperExpr> */
+((void (*)(val*, val*))(var_node->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_node, self) /* parent= on <var_node:TKwsuper>*/;
+RET_LABEL:;
+}
+/* method parser_prod#ASuperExpr#n_kwsuper= for (self: Object, TKwsuper) */
+void VIRTUAL_parser_prod__ASuperExpr__n_kwsuper_61d(val* self, val* p0) {
+parser_prod__ASuperExpr__n_kwsuper_61d(self, p0);
+RET_LABEL:;
+}
+/* method parser_prod#ASuperExpr#n_args= for (self: ASuperExpr, AExprs) */
+void parser_prod__ASuperExpr__n_args_61d(val* self, val* p0) {
+val* var_node /* var node: AExprs */;
+var_node = p0;
+self->attrs[COLOR_parser_nodes__ASuperExpr___n_args].val = var_node; /* _n_args on <self:ASuperExpr> */
+((void (*)(val*, val*))(var_node->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_node, self) /* parent= on <var_node:AExprs>*/;
+RET_LABEL:;
+}
+/* method parser_prod#ASuperExpr#n_args= for (self: Object, AExprs) */
+void VIRTUAL_parser_prod__ASuperExpr__n_args_61d(val* self, val* p0) {
+parser_prod__ASuperExpr__n_args_61d(self, p0);
+RET_LABEL:;
+}
+/* method parser_prod#ASuperExpr#visit_all for (self: ASuperExpr, Visitor) */
+void parser_prod__ASuperExpr__visit_all(val* self, val* p0) {
+val* var_v /* var v: Visitor */;
+val* var /* : nullable AQualified */;
+val* var1 /* : null */;
+short int var2 /* : Bool */;
+val* var3 /* : nullable AQualified */;
+val* var4 /* : TKwsuper */;
+val* var5 /* : AExprs */;
+var_v = p0;
+var = self->attrs[COLOR_parser_nodes__ASuperExpr___n_qualified].val; /* _n_qualified on <self:ASuperExpr> */
+var1 = NULL;
+if (var == NULL) {
+var2 = 0; /* is null */
+} else {
+var2 = 1; /* arg is null and recv is not */
+}
+if (var2){
+var3 = self->attrs[COLOR_parser_nodes__ASuperExpr___n_qualified].val; /* _n_qualified on <self:ASuperExpr> */
+if (var3 == NULL) {
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7773);
+show_backtrace(1);
+}
+((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var3) /* enter_visit on <var_v:Visitor>*/;
+} else {
+}
+var4 = self->attrs[COLOR_parser_nodes__ASuperExpr___n_kwsuper].val; /* _n_kwsuper on <self:ASuperExpr> */
+if (var4 == NULL) {
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwsuper");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7775);
+show_backtrace(1);
+}
+((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var4) /* enter_visit on <var_v:Visitor>*/;
+var5 = self->attrs[COLOR_parser_nodes__ASuperExpr___n_args].val; /* _n_args on <self:ASuperExpr> */
+if (var5 == NULL) {
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_args");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7776);
+show_backtrace(1);
+}
+((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var5) /* enter_visit on <var_v:Visitor>*/;
+RET_LABEL:;
+}
+/* method parser_prod#ASuperExpr#visit_all for (self: Object, Visitor) */
+void VIRTUAL_parser_prod__ASuperExpr__visit_all(val* self, val* p0) {
+parser_prod__ASuperExpr__visit_all(self, p0);
+RET_LABEL:;
+}
+/* method parser_prod#AInitExpr#empty_init for (self: AInitExpr) */
+void parser_prod__AInitExpr__empty_init(val* self) {
+RET_LABEL:;
+}
+/* method parser_prod#AInitExpr#empty_init for (self: Object) */
+void VIRTUAL_parser_prod__AInitExpr__empty_init(val* self) {
+parser_prod__AInitExpr__empty_init(self);
+RET_LABEL:;
+}
+/* method parser_prod#AInitExpr#init_ainitexpr for (self: AInitExpr, nullable AExpr, nullable TKwinit, nullable AExprs) */
+void parser_prod__AInitExpr__init_ainitexpr(val* self, val* p0, val* p1, val* p2) {
+val* var_n_expr /* var n_expr: nullable AExpr */;
+val* var_n_kwinit /* var n_kwinit: nullable TKwinit */;
+val* var_n_args /* var n_args: nullable AExprs */;
+var_n_expr = p0;
+var_n_kwinit = p1;
+var_n_args = p2;
+((void (*)(val*))(self->class->vft[COLOR_parser_prod__AInitExpr__empty_init]))(self) /* empty_init on <self:AInitExpr>*/;
+if (var_n_expr == NULL) {
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7789);
+show_backtrace(1);
+}
+self->attrs[COLOR_parser_nodes__ASendExpr___n_expr].val = var_n_expr; /* _n_expr on <self:AInitExpr> */
+if (var_n_expr == NULL) {
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7790);
+show_backtrace(1);
+} else {
+((void (*)(val*, val*))(var_n_expr->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_expr, self) /* parent= on <var_n_expr:nullable AExpr>*/;
+}
+if (var_n_kwinit == NULL) {
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7791);
+show_backtrace(1);
+}
+self->attrs[COLOR_parser_nodes__AInitExpr___n_kwinit].val = var_n_kwinit; /* _n_kwinit on <self:AInitExpr> */
+if (var_n_kwinit == NULL) {
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7792);
+show_backtrace(1);
+} else {
+((void (*)(val*, val*))(var_n_kwinit->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_kwinit, self) /* parent= on <var_n_kwinit:nullable TKwinit>*/;
+}
+if (var_n_args == NULL) {
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7793);
+show_backtrace(1);
+}
+self->attrs[COLOR_parser_nodes__AInitExpr___n_args].val = var_n_args; /* _n_args on <self:AInitExpr> */
+if (var_n_args == NULL) {
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7794);
+show_backtrace(1);
+} else {
+((void (*)(val*, val*))(var_n_args->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_args, self) /* parent= on <var_n_args:nullable AExprs>*/;
+}
+RET_LABEL:;
+}
+/* method parser_prod#AInitExpr#init_ainitexpr for (self: Object, nullable AExpr, nullable TKwinit, nullable AExprs) */
+void VIRTUAL_parser_prod__AInitExpr__init_ainitexpr(val* self, val* p0, val* p1, val* p2) {
+parser_prod__AInitExpr__init_ainitexpr(self, p0, p1, p2);
+RET_LABEL:;
+}
+/* method parser_prod#AInitExpr#replace_child for (self: AInitExpr, ANode, nullable ANode) */
+void parser_prod__AInitExpr__replace_child(val* self, val* p0, val* p1) {
+val* var_old_child /* var old_child: ANode */;
+val* var_new_child /* var new_child: nullable ANode */;
+val* var /* : AExpr */;
+short int var1 /* : Bool */;
+val* var2 /* : null */;
+short int var3 /* : Bool */;
+short int var4 /* : Bool */;
+int cltype;
+int idtype;
+val* var5 /* : TKwinit */;
+short int var6 /* : Bool */;
+val* var7 /* : null */;
+short int var8 /* : Bool */;
+short int var9 /* : Bool */;
+int cltype10;
+int idtype11;
+val* var12 /* : AExprs */;
+short int var13 /* : Bool */;
+val* var14 /* : null */;
+short int var15 /* : Bool */;
+short int var16 /* : Bool */;
+int cltype17;
+int idtype18;
+var_old_child = p0;
+var_new_child = p1;
+var = self->attrs[COLOR_parser_nodes__ASendExpr___n_expr].val; /* _n_expr on <self:AInitExpr> */
+if (var == NULL) {
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7799);
+show_backtrace(1);
+}
+var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:AExpr>*/;
+if (var1){
+var2 = NULL;
+if (var_new_child == NULL) {
+var3 = 0; /* is null */
+} else {
+var3 = 1; /* arg is null and recv is not */
+}
+if (var3){
+((void (*)(val*, val*))(var_new_child->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_new_child, self) /* parent= on <var_new_child:nullable ANode(ANode)>*/;
+/* <var_new_child:nullable ANode(ANode)> isa AExpr */
+cltype = type_parser_nodes__AExpr.color;
+idtype = type_parser_nodes__AExpr.id;
+if(cltype >= var_new_child->type->table_size) {
+var4 = 0;
+} else {
+var4 = var_new_child->type->type_table[cltype] == idtype;
+}
+if (!var4) {
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7802);
+show_backtrace(1);
+}
+self->attrs[COLOR_parser_nodes__ASendExpr___n_expr].val = var_new_child; /* _n_expr on <self:AInitExpr> */
+} else {
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7805);
+show_backtrace(1);
+}
+goto RET_LABEL;
+} else {
+}
+var5 = self->attrs[COLOR_parser_nodes__AInitExpr___n_kwinit].val; /* _n_kwinit on <self:AInitExpr> */
+if (var5 == NULL) {
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwinit");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7809);
+show_backtrace(1);
+}
+var6 = ((short int (*)(val*, val*))(var5->class->vft[COLOR_kernel__Object___61d_61d]))(var5, var_old_child) /* == on <var5:TKwinit>*/;
+if (var6){
+var7 = NULL;
+if (var_new_child == NULL) {
+var8 = 0; /* is null */
+} else {
+var8 = 1; /* arg is null and recv is not */
+}
+if (var8){
+((void (*)(val*, val*))(var_new_child->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_new_child, self) /* parent= on <var_new_child:nullable ANode(ANode)>*/;
+/* <var_new_child:nullable ANode(ANode)> isa TKwinit */
+cltype10 = type_parser_nodes__TKwinit.color;
+idtype11 = type_parser_nodes__TKwinit.id;
+if(cltype10 >= var_new_child->type->table_size) {
+var9 = 0;
+} else {
+var9 = var_new_child->type->type_table[cltype10] == idtype11;
+}
+if (!var9) {
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7812);
+show_backtrace(1);
+}
+self->attrs[COLOR_parser_nodes__AInitExpr___n_kwinit].val = var_new_child; /* _n_kwinit on <self:AInitExpr> */
+} else {
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7815);
+show_backtrace(1);
+}
+goto RET_LABEL;
+} else {
+}
+var12 = self->attrs[COLOR_parser_nodes__AInitExpr___n_args].val; /* _n_args on <self:AInitExpr> */
+if (var12 == NULL) {
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_args");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7819);
+show_backtrace(1);
+}
+var13 = ((short int (*)(val*, val*))(var12->class->vft[COLOR_kernel__Object___61d_61d]))(var12, var_old_child) /* == on <var12:AExprs>*/;
+if (var13){
+var14 = NULL;
+if (var_new_child == NULL) {
+var15 = 0; /* is null */
+} else {
+var15 = 1; /* arg is null and recv is not */
+}
+if (var15){
+((void (*)(val*, val*))(var_new_child->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_new_child, self) /* parent= on <var_new_child:nullable ANode(ANode)>*/;
+/* <var_new_child:nullable ANode(ANode)> isa AExprs */
+cltype17 = type_parser_nodes__AExprs.color;
+idtype18 = type_parser_nodes__AExprs.id;
+if(cltype17 >= var_new_child->type->table_size) {
+var16 = 0;
+} else {
+var16 = var_new_child->type->type_table[cltype17] == idtype18;
+}
+if (!var16) {
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7822);
+show_backtrace(1);
+}
+self->attrs[COLOR_parser_nodes__AInitExpr___n_args].val = var_new_child; /* _n_args on <self:AInitExpr> */
+} else {
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7825);
+show_backtrace(1);
+}
+goto RET_LABEL;
+} else {
+}
+RET_LABEL:;
+}
+/* method parser_prod#AInitExpr#replace_child for (self: Object, ANode, nullable ANode) */
+void VIRTUAL_parser_prod__AInitExpr__replace_child(val* self, val* p0, val* p1) {
+parser_prod__AInitExpr__replace_child(self, p0, p1);
+RET_LABEL:;
+}
+/* method parser_prod#AInitExpr#n_expr= for (self: AInitExpr, AExpr) */
+void parser_prod__AInitExpr__n_expr_61d(val* self, val* p0) {
+val* var_node /* var node: AExpr */;
+var_node = p0;
+self->attrs[COLOR_parser_nodes__ASendExpr___n_expr].val = var_node; /* _n_expr on <self:AInitExpr> */
+((void (*)(val*, val*))(var_node->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_node, self) /* parent= on <var_node:AExpr>*/;
+RET_LABEL:;
+}
+/* method parser_prod#AInitExpr#n_expr= for (self: Object, AExpr) */
+void VIRTUAL_parser_prod__AInitExpr__n_expr_61d(val* self, val* p0) {
+parser_prod__AInitExpr__n_expr_61d(self, p0);
+RET_LABEL:;
+}
+/* method parser_prod#AInitExpr#n_kwinit= for (self: AInitExpr, TKwinit) */
+void parser_prod__AInitExpr__n_kwinit_61d(val* self, val* p0) {
+val* var_node /* var node: TKwinit */;
+var_node = p0;
+self->attrs[COLOR_parser_nodes__AInitExpr___n_kwinit].val = var_node; /* _n_kwinit on <self:AInitExpr> */
+((void (*)(val*, val*))(var_node->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_node, self) /* parent= on <var_node:TKwinit>*/;
+RET_LABEL:;
+}
+/* method parser_prod#AInitExpr#n_kwinit= for (self: Object, TKwinit) */
+void VIRTUAL_parser_prod__AInitExpr__n_kwinit_61d(val* self, val* p0) {
+parser_prod__AInitExpr__n_kwinit_61d(self, p0);
+RET_LABEL:;
+}
+/* method parser_prod#AInitExpr#n_args= for (self: AInitExpr, AExprs) */
+void parser_prod__AInitExpr__n_args_61d(val* self, val* p0) {
+val* var_node /* var node: AExprs */;
+var_node = p0;
+self->attrs[COLOR_parser_nodes__AInitExpr___n_args].val = var_node; /* _n_args on <self:AInitExpr> */
+((void (*)(val*, val*))(var_node->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_node, self) /* parent= on <var_node:AExprs>*/;
+RET_LABEL:;
+}
+/* method parser_prod#AInitExpr#n_args= for (self: Object, AExprs) */
+void VIRTUAL_parser_prod__AInitExpr__n_args_61d(val* self, val* p0) {
+parser_prod__AInitExpr__n_args_61d(self, p0);
+RET_LABEL:;
+}
 /* method parser_prod#AInitExpr#visit_all for (self: AInitExpr, Visitor) */
 void parser_prod__AInitExpr__visit_all(val* self, val* p0) {
 val* var_v /* var v: Visitor */;
@@ -8,20 +333,23 @@ val* var2 /* : AExprs */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__ASendExpr___n_expr].val; /* _n_expr on <self:AInitExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr", "src/parser/parser_prod.nit", 8075);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7850);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 var1 = self->attrs[COLOR_parser_nodes__AInitExpr___n_kwinit].val; /* _n_kwinit on <self:AInitExpr> */
 if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_kwinit", "src/parser/parser_prod.nit", 8076);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwinit");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7851);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var1) /* enter_visit on <var_v:Visitor>*/;
 var2 = self->attrs[COLOR_parser_nodes__AInitExpr___n_args].val; /* _n_args on <self:AInitExpr> */
 if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_args", "src/parser/parser_prod.nit", 8077);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_args");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7852);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var2) /* enter_visit on <var_v:Visitor>*/;
 RET_LABEL:;
@@ -40,79 +368,44 @@ void VIRTUAL_parser_prod__ABraExpr__empty_init(val* self) {
 parser_prod__ABraExpr__empty_init(self);
 RET_LABEL:;
 }
-/* method parser_prod#ABraExpr#init_abraexpr for (self: ABraExpr, nullable AExpr, nullable AExprs, Collection[Object]) */
-void parser_prod__ABraExpr__init_abraexpr(val* self, val* p0, val* p1, val* p2) {
+/* method parser_prod#ABraExpr#init_abraexpr for (self: ABraExpr, nullable AExpr, nullable AExprs) */
+void parser_prod__ABraExpr__init_abraexpr(val* self, val* p0, val* p1) {
 val* var_n_expr /* var n_expr: nullable AExpr */;
 val* var_n_args /* var n_args: nullable AExprs */;
-val* var_n_closure_defs /* var n_closure_defs: Collection[Object] */;
-val* var /* : Iterator[nullable Object] */;
-short int var1 /* : Bool */;
-val* var2 /* : nullable Object */;
-val* var_n /* var n: Object */;
-short int var3 /* : Bool */;
-int cltype;
-int idtype;
-val* var4 /* : ANodes[AClosureDef] */;
 var_n_expr = p0;
 var_n_args = p1;
-var_n_closure_defs = p2;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__ABraExpr__empty_init]))(self) /* empty_init on <self:ABraExpr>*/;
 if (var_n_expr == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8090);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7864);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ASendExpr___n_expr].val = var_n_expr; /* _n_expr on <self:ABraExpr> */
 if (var_n_expr == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8091);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7865);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_expr->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_expr, self) /* parent= on <var_n_expr:nullable AExpr>*/;
 }
 if (var_n_args == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8092);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7866);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ABraFormExpr___n_args].val = var_n_args; /* _n_args on <self:ABraExpr> */
 if (var_n_args == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8093);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7867);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_args->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_args, self) /* parent= on <var_n_args:nullable AExprs>*/;
 }
-var = ((val* (*)(val*))(var_n_closure_defs->class->vft[COLOR_abstract_collection__Collection__iterator]))(var_n_closure_defs) /* iterator on <var_n_closure_defs:Collection[Object]>*/;
-for(;;) {
-var1 = ((short int (*)(val*))(var->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(var) /* is_ok on <var:Iterator[nullable Object]>*/;
-if(!var1) break;
-var2 = ((val* (*)(val*))(var->class->vft[COLOR_abstract_collection__Iterator__item]))(var) /* item on <var:Iterator[nullable Object]>*/;
-var_n = var2;
-/* <var_n:Object> isa AClosureDef */
-cltype = type_parser_nodes__AClosureDef.color;
-idtype = type_parser_nodes__AClosureDef.id;
-if(cltype >= var_n->type->table_size) {
-var3 = 0;
-} else {
-var3 = var_n->type->type_table[cltype] == idtype;
-}
-if (!var3) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8095);
-exit(1);
-}
-var4 = self->attrs[COLOR_parser_nodes__ASendExpr___n_closure_defs].val; /* _n_closure_defs on <self:ABraExpr> */
-if (var4 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_closure_defs", "src/parser/parser_prod.nit", 8096);
-exit(1);
-}
-((void (*)(val*, val*))(var4->class->vft[COLOR_abstract_collection__SimpleCollection__add]))(var4, var_n) /* add on <var4:ANodes[AClosureDef]>*/;
-((void (*)(val*, val*))(var_n->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n, self) /* parent= on <var_n:Object(AClosureDef)>*/;
-CONTINUE_label: (void)0;
-((void (*)(val*))(var->class->vft[COLOR_abstract_collection__Iterator__next]))(var) /* next on <var:Iterator[nullable Object]>*/;
-}
-BREAK_label: (void)0;
 RET_LABEL:;
 }
-/* method parser_prod#ABraExpr#init_abraexpr for (self: Object, nullable AExpr, nullable AExprs, Collection[Object]) */
-void VIRTUAL_parser_prod__ABraExpr__init_abraexpr(val* self, val* p0, val* p1, val* p2) {
-parser_prod__ABraExpr__init_abraexpr(self, p0, p1, p2);
+/* method parser_prod#ABraExpr#init_abraexpr for (self: Object, nullable AExpr, nullable AExprs) */
+void VIRTUAL_parser_prod__ABraExpr__init_abraexpr(val* self, val* p0, val* p1) {
+parser_prod__ABraExpr__init_abraexpr(self, p0, p1);
 RET_LABEL:;
 }
 /* method parser_prod#ABraExpr#replace_child for (self: ABraExpr, ANode, nullable ANode) */
@@ -133,33 +426,13 @@ short int var8 /* : Bool */;
 short int var9 /* : Bool */;
 int cltype10;
 int idtype11;
-val* var12 /* : Range[Int] */;
-long var13 /* : Int */;
-val* var14 /* : ANodes[AClosureDef] */;
-long var15 /* : Int */;
-val* var16 /* : Discrete */;
-val* var17 /* : Discrete */;
-val* var18 /* : Iterator[nullable Object] */;
-short int var19 /* : Bool */;
-val* var20 /* : nullable Object */;
-long var_i /* var i: Int */;
-long var21 /* : Int */;
-val* var22 /* : ANodes[AClosureDef] */;
-val* var23 /* : nullable Object */;
-short int var24 /* : Bool */;
-val* var25 /* : null */;
-short int var26 /* : Bool */;
-short int var27 /* : Bool */;
-int cltype28;
-int idtype29;
-val* var30 /* : ANodes[AClosureDef] */;
-val* var31 /* : ANodes[AClosureDef] */;
 var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__ASendExpr___n_expr].val; /* _n_expr on <self:ABraExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr", "src/parser/parser_prod.nit", 8103);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7872);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:AExpr>*/;
 if (var1){
@@ -180,21 +453,24 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8106);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7875);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ASendExpr___n_expr].val = var_new_child; /* _n_expr on <self:ABraExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8109);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7878);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var5 = self->attrs[COLOR_parser_nodes__ABraFormExpr___n_args].val; /* _n_args on <self:ABraExpr> */
 if (var5 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_args", "src/parser/parser_prod.nit", 8113);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_args");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7882);
+show_backtrace(1);
 }
 var6 = ((short int (*)(val*, val*))(var5->class->vft[COLOR_kernel__Object___61d_61d]))(var5, var_old_child) /* == on <var5:AExprs>*/;
 if (var6){
@@ -215,85 +491,19 @@ var9 = 0;
 var9 = var_new_child->type->type_table[cltype10] == idtype11;
 }
 if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8116);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7885);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ABraFormExpr___n_args].val = var_new_child; /* _n_args on <self:ABraExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8119);
-exit(1);
-}
-goto RET_LABEL;
-} else {
-}
-var12 = NEW_range__Range(&type_range__Rangekernel__Int);
-var13 = 0;
-var14 = self->attrs[COLOR_parser_nodes__ASendExpr___n_closure_defs].val; /* _n_closure_defs on <self:ABraExpr> */
-if (var14 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_closure_defs", "src/parser/parser_prod.nit", 8123);
-exit(1);
-}
-var15 = ((long (*)(val*))(var14->class->vft[COLOR_abstract_collection__Collection__length]))(var14) /* length on <var14:ANodes[AClosureDef]>*/;
-var16 = BOX_kernel__Int(var13); /* autobox from Int to Discrete */
-var17 = BOX_kernel__Int(var15); /* autobox from Int to Discrete */
-((void (*)(val*, val*, val*))(var12->class->vft[COLOR_range__Range__without_last]))(var12, var16, var17) /* without_last on <var12:Range[Int]>*/;
-CHECK_NEW_range__Range(var12);
-var18 = ((val* (*)(val*))(var12->class->vft[COLOR_abstract_collection__Collection__iterator]))(var12) /* iterator on <var12:Range[Int]>*/;
-for(;;) {
-var19 = ((short int (*)(val*))(var18->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(var18) /* is_ok on <var18:Iterator[nullable Object]>*/;
-if(!var19) break;
-var20 = ((val* (*)(val*))(var18->class->vft[COLOR_abstract_collection__Iterator__item]))(var18) /* item on <var18:Iterator[nullable Object]>*/;
-var21 = ((struct instance_kernel__Int*)var20)->value; /* autounbox from nullable Object to Int */;
-var_i = var21;
-var22 = self->attrs[COLOR_parser_nodes__ASendExpr___n_closure_defs].val; /* _n_closure_defs on <self:ABraExpr> */
-if (var22 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_closure_defs", "src/parser/parser_prod.nit", 8124);
-exit(1);
-}
-var23 = ((val* (*)(val*, long))(var22->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(var22, var_i) /* [] on <var22:ANodes[AClosureDef]>*/;
-var24 = ((short int (*)(val*, val*))(var23->class->vft[COLOR_kernel__Object___61d_61d]))(var23, var_old_child) /* == on <var23:nullable Object(AClosureDef)>*/;
-if (var24){
-var25 = NULL;
-if (var_new_child == NULL) {
-var26 = 0; /* is null */
-} else {
-var26 = 1; /* arg is null and recv is not */
-}
-if (var26){
-/* <var_new_child:nullable ANode(ANode)> isa AClosureDef */
-cltype28 = type_parser_nodes__AClosureDef.color;
-idtype29 = type_parser_nodes__AClosureDef.id;
-if(cltype28 >= var_new_child->type->table_size) {
-var27 = 0;
-} else {
-var27 = var_new_child->type->type_table[cltype28] == idtype29;
-}
-if (!var27) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8126);
-exit(1);
-}
-var30 = self->attrs[COLOR_parser_nodes__ASendExpr___n_closure_defs].val; /* _n_closure_defs on <self:ABraExpr> */
-if (var30 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_closure_defs", "src/parser/parser_prod.nit", 8127);
-exit(1);
-}
-((void (*)(val*, long, val*))(var30->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(var30, var_i, var_new_child) /* []= on <var30:ANodes[AClosureDef]>*/;
-((void (*)(val*, val*))(var_new_child->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_new_child, self) /* parent= on <var_new_child:nullable ANode(AClosureDef)>*/;
-} else {
-var31 = self->attrs[COLOR_parser_nodes__ASendExpr___n_closure_defs].val; /* _n_closure_defs on <self:ABraExpr> */
-if (var31 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_closure_defs", "src/parser/parser_prod.nit", 8130);
-exit(1);
-}
-((void (*)(val*, long))(var31->class->vft[COLOR_abstract_collection__Sequence__remove_at]))(var31, var_i) /* remove_at on <var31:ANodes[AClosureDef]>*/;
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7888);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
-CONTINUE_label: (void)0;
-((void (*)(val*))(var18->class->vft[COLOR_abstract_collection__Iterator__next]))(var18) /* next on <var18:Iterator[nullable Object]>*/;
-}
-BREAK_label: (void)0;
 RET_LABEL:;
 }
 /* method parser_prod#ABraExpr#replace_child for (self: Object, ANode, nullable ANode) */
@@ -332,40 +542,21 @@ void parser_prod__ABraExpr__visit_all(val* self, val* p0) {
 val* var_v /* var v: Visitor */;
 val* var /* : AExpr */;
 val* var1 /* : AExprs */;
-val* var2 /* : ANodes[AClosureDef] */;
-val* var3 /* : Iterator[nullable Object] */;
-short int var4 /* : Bool */;
-val* var5 /* : nullable Object */;
-val* var_n /* var n: AClosureDef */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__ASendExpr___n_expr].val; /* _n_expr on <self:ABraExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr", "src/parser/parser_prod.nit", 8151);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7908);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 var1 = self->attrs[COLOR_parser_nodes__ABraFormExpr___n_args].val; /* _n_args on <self:ABraExpr> */
 if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_args", "src/parser/parser_prod.nit", 8152);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_args");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7909);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var1) /* enter_visit on <var_v:Visitor>*/;
-var2 = self->attrs[COLOR_parser_nodes__ASendExpr___n_closure_defs].val; /* _n_closure_defs on <self:ABraExpr> */
-if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_closure_defs", "src/parser/parser_prod.nit", 8153);
-exit(1);
-}
-var3 = ((val* (*)(val*))(var2->class->vft[COLOR_abstract_collection__Collection__iterator]))(var2) /* iterator on <var2:ANodes[AClosureDef]>*/;
-for(;;) {
-var4 = ((short int (*)(val*))(var3->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(var3) /* is_ok on <var3:Iterator[nullable Object]>*/;
-if(!var4) break;
-var5 = ((val* (*)(val*))(var3->class->vft[COLOR_abstract_collection__Iterator__item]))(var3) /* item on <var3:Iterator[nullable Object]>*/;
-var_n = var5;
-((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var_n) /* enter_visit on <var_v:Visitor>*/;
-CONTINUE_label: (void)0;
-((void (*)(val*))(var3->class->vft[COLOR_abstract_collection__Iterator__next]))(var3) /* next on <var3:Iterator[nullable Object]>*/;
-}
-BREAK_label: (void)0;
 RET_LABEL:;
 }
 /* method parser_prod#ABraExpr#visit_all for (self: Object, Visitor) */
@@ -394,46 +585,54 @@ var_n_assign = p2;
 var_n_value = p3;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__ABraAssignExpr__empty_init]))(self) /* empty_init on <self:ABraAssignExpr>*/;
 if (var_n_expr == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8169);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7923);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ASendExpr___n_expr].val = var_n_expr; /* _n_expr on <self:ABraAssignExpr> */
 if (var_n_expr == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8170);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7924);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_expr->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_expr, self) /* parent= on <var_n_expr:nullable AExpr>*/;
 }
 if (var_n_args == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8171);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7925);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ABraFormExpr___n_args].val = var_n_args; /* _n_args on <self:ABraAssignExpr> */
 if (var_n_args == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8172);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7926);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_args->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_args, self) /* parent= on <var_n_args:nullable AExprs>*/;
 }
 if (var_n_assign == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8173);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7927);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAssignFormExpr___n_assign].val = var_n_assign; /* _n_assign on <self:ABraAssignExpr> */
 if (var_n_assign == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8174);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7928);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_assign->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_assign, self) /* parent= on <var_n_assign:nullable TAssign>*/;
 }
 if (var_n_value == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8175);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7929);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAssignFormExpr___n_value].val = var_n_value; /* _n_value on <self:ABraAssignExpr> */
 if (var_n_value == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8176);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7930);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_value->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_value, self) /* parent= on <var_n_value:nullable AExpr>*/;
 }
@@ -480,8 +679,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__ASendExpr___n_expr].val; /* _n_expr on <self:ABraAssignExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr", "src/parser/parser_prod.nit", 8181);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7935);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:AExpr>*/;
 if (var1){
@@ -502,21 +702,24 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8184);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7938);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ASendExpr___n_expr].val = var_new_child; /* _n_expr on <self:ABraAssignExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8187);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7941);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var5 = self->attrs[COLOR_parser_nodes__ABraFormExpr___n_args].val; /* _n_args on <self:ABraAssignExpr> */
 if (var5 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_args", "src/parser/parser_prod.nit", 8191);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_args");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7945);
+show_backtrace(1);
 }
 var6 = ((short int (*)(val*, val*))(var5->class->vft[COLOR_kernel__Object___61d_61d]))(var5, var_old_child) /* == on <var5:AExprs>*/;
 if (var6){
@@ -537,21 +740,24 @@ var9 = 0;
 var9 = var_new_child->type->type_table[cltype10] == idtype11;
 }
 if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8194);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7948);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ABraFormExpr___n_args].val = var_new_child; /* _n_args on <self:ABraAssignExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8197);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7951);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var12 = self->attrs[COLOR_parser_nodes__AAssignFormExpr___n_assign].val; /* _n_assign on <self:ABraAssignExpr> */
 if (var12 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_assign", "src/parser/parser_prod.nit", 8201);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_assign");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7955);
+show_backtrace(1);
 }
 var13 = ((short int (*)(val*, val*))(var12->class->vft[COLOR_kernel__Object___61d_61d]))(var12, var_old_child) /* == on <var12:TAssign>*/;
 if (var13){
@@ -572,21 +778,24 @@ var16 = 0;
 var16 = var_new_child->type->type_table[cltype17] == idtype18;
 }
 if (!var16) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8204);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7958);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAssignFormExpr___n_assign].val = var_new_child; /* _n_assign on <self:ABraAssignExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8207);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7961);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var19 = self->attrs[COLOR_parser_nodes__AAssignFormExpr___n_value].val; /* _n_value on <self:ABraAssignExpr> */
 if (var19 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_value", "src/parser/parser_prod.nit", 8211);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_value");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7965);
+show_backtrace(1);
 }
 var20 = ((short int (*)(val*, val*))(var19->class->vft[COLOR_kernel__Object___61d_61d]))(var19, var_old_child) /* == on <var19:AExpr>*/;
 if (var20){
@@ -607,13 +816,15 @@ var23 = 0;
 var23 = var_new_child->type->type_table[cltype24] == idtype25;
 }
 if (!var23) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8214);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7968);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAssignFormExpr___n_value].val = var_new_child; /* _n_value on <self:ABraAssignExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8217);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 7971);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -687,26 +898,30 @@ val* var3 /* : AExpr */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__ASendExpr___n_expr].val; /* _n_expr on <self:ABraAssignExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr", "src/parser/parser_prod.nit", 8247);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8001);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 var1 = self->attrs[COLOR_parser_nodes__ABraFormExpr___n_args].val; /* _n_args on <self:ABraAssignExpr> */
 if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_args", "src/parser/parser_prod.nit", 8248);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_args");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8002);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var1) /* enter_visit on <var_v:Visitor>*/;
 var2 = self->attrs[COLOR_parser_nodes__AAssignFormExpr___n_assign].val; /* _n_assign on <self:ABraAssignExpr> */
 if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_assign", "src/parser/parser_prod.nit", 8249);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_assign");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8003);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var2) /* enter_visit on <var_v:Visitor>*/;
 var3 = self->attrs[COLOR_parser_nodes__AAssignFormExpr___n_value].val; /* _n_value on <self:ABraAssignExpr> */
 if (var3 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_value", "src/parser/parser_prod.nit", 8250);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_value");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8004);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var3) /* enter_visit on <var_v:Visitor>*/;
 RET_LABEL:;
@@ -737,46 +952,54 @@ var_n_assign_op = p2;
 var_n_value = p3;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__ABraReassignExpr__empty_init]))(self) /* empty_init on <self:ABraReassignExpr>*/;
 if (var_n_expr == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8264);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8018);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ASendExpr___n_expr].val = var_n_expr; /* _n_expr on <self:ABraReassignExpr> */
 if (var_n_expr == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8265);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8019);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_expr->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_expr, self) /* parent= on <var_n_expr:nullable AExpr>*/;
 }
 if (var_n_args == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8266);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8020);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ABraFormExpr___n_args].val = var_n_args; /* _n_args on <self:ABraReassignExpr> */
 if (var_n_args == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8267);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8021);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_args->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_args, self) /* parent= on <var_n_args:nullable AExprs>*/;
 }
 if (var_n_assign_op == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8268);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8022);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AReassignFormExpr___n_assign_op].val = var_n_assign_op; /* _n_assign_op on <self:ABraReassignExpr> */
 if (var_n_assign_op == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8269);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8023);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_assign_op->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_assign_op, self) /* parent= on <var_n_assign_op:nullable AAssignOp>*/;
 }
 if (var_n_value == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8270);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8024);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AReassignFormExpr___n_value].val = var_n_value; /* _n_value on <self:ABraReassignExpr> */
 if (var_n_value == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8271);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8025);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_value->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_value, self) /* parent= on <var_n_value:nullable AExpr>*/;
 }
@@ -823,8 +1046,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__ASendExpr___n_expr].val; /* _n_expr on <self:ABraReassignExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr", "src/parser/parser_prod.nit", 8276);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8030);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:AExpr>*/;
 if (var1){
@@ -845,21 +1069,24 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8279);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8033);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ASendExpr___n_expr].val = var_new_child; /* _n_expr on <self:ABraReassignExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8282);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8036);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var5 = self->attrs[COLOR_parser_nodes__ABraFormExpr___n_args].val; /* _n_args on <self:ABraReassignExpr> */
 if (var5 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_args", "src/parser/parser_prod.nit", 8286);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_args");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8040);
+show_backtrace(1);
 }
 var6 = ((short int (*)(val*, val*))(var5->class->vft[COLOR_kernel__Object___61d_61d]))(var5, var_old_child) /* == on <var5:AExprs>*/;
 if (var6){
@@ -880,21 +1107,24 @@ var9 = 0;
 var9 = var_new_child->type->type_table[cltype10] == idtype11;
 }
 if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8289);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8043);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ABraFormExpr___n_args].val = var_new_child; /* _n_args on <self:ABraReassignExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8292);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8046);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var12 = self->attrs[COLOR_parser_nodes__AReassignFormExpr___n_assign_op].val; /* _n_assign_op on <self:ABraReassignExpr> */
 if (var12 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_assign_op", "src/parser/parser_prod.nit", 8296);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_assign_op");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8050);
+show_backtrace(1);
 }
 var13 = ((short int (*)(val*, val*))(var12->class->vft[COLOR_kernel__Object___61d_61d]))(var12, var_old_child) /* == on <var12:AAssignOp>*/;
 if (var13){
@@ -915,21 +1145,24 @@ var16 = 0;
 var16 = var_new_child->type->type_table[cltype17] == idtype18;
 }
 if (!var16) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8299);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8053);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AReassignFormExpr___n_assign_op].val = var_new_child; /* _n_assign_op on <self:ABraReassignExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8302);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8056);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var19 = self->attrs[COLOR_parser_nodes__AReassignFormExpr___n_value].val; /* _n_value on <self:ABraReassignExpr> */
 if (var19 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_value", "src/parser/parser_prod.nit", 8306);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_value");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8060);
+show_backtrace(1);
 }
 var20 = ((short int (*)(val*, val*))(var19->class->vft[COLOR_kernel__Object___61d_61d]))(var19, var_old_child) /* == on <var19:AExpr>*/;
 if (var20){
@@ -950,13 +1183,15 @@ var23 = 0;
 var23 = var_new_child->type->type_table[cltype24] == idtype25;
 }
 if (!var23) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8309);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8063);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AReassignFormExpr___n_value].val = var_new_child; /* _n_value on <self:ABraReassignExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8312);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8066);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -1030,26 +1265,30 @@ val* var3 /* : AExpr */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__ASendExpr___n_expr].val; /* _n_expr on <self:ABraReassignExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr", "src/parser/parser_prod.nit", 8342);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8096);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 var1 = self->attrs[COLOR_parser_nodes__ABraFormExpr___n_args].val; /* _n_args on <self:ABraReassignExpr> */
 if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_args", "src/parser/parser_prod.nit", 8343);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_args");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8097);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var1) /* enter_visit on <var_v:Visitor>*/;
 var2 = self->attrs[COLOR_parser_nodes__AReassignFormExpr___n_assign_op].val; /* _n_assign_op on <self:ABraReassignExpr> */
 if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_assign_op", "src/parser/parser_prod.nit", 8344);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_assign_op");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8098);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var2) /* enter_visit on <var_v:Visitor>*/;
 var3 = self->attrs[COLOR_parser_nodes__AReassignFormExpr___n_value].val; /* _n_value on <self:ABraReassignExpr> */
 if (var3 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_value", "src/parser/parser_prod.nit", 8345);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_value");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8099);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var3) /* enter_visit on <var_v:Visitor>*/;
 RET_LABEL:;
@@ -1059,370 +1298,30 @@ void VIRTUAL_parser_prod__ABraReassignExpr__visit_all(val* self, val* p0) {
 parser_prod__ABraReassignExpr__visit_all(self, p0);
 RET_LABEL:;
 }
-/* method parser_prod#AClosureCallExpr#empty_init for (self: AClosureCallExpr) */
-void parser_prod__AClosureCallExpr__empty_init(val* self) {
+/* method parser_prod#AVarExpr#empty_init for (self: AVarExpr) */
+void parser_prod__AVarExpr__empty_init(val* self) {
 RET_LABEL:;
 }
-/* method parser_prod#AClosureCallExpr#empty_init for (self: Object) */
-void VIRTUAL_parser_prod__AClosureCallExpr__empty_init(val* self) {
-parser_prod__AClosureCallExpr__empty_init(self);
+/* method parser_prod#AVarExpr#empty_init for (self: Object) */
+void VIRTUAL_parser_prod__AVarExpr__empty_init(val* self) {
+parser_prod__AVarExpr__empty_init(self);
 RET_LABEL:;
 }
-/* method parser_prod#AClosureCallExpr#init_aclosurecallexpr for (self: AClosureCallExpr, nullable TId, nullable AExprs, Collection[Object]) */
-void parser_prod__AClosureCallExpr__init_aclosurecallexpr(val* self, val* p0, val* p1, val* p2) {
-val* var_n_id /* var n_id: nullable TId */;
-val* var_n_args /* var n_args: nullable AExprs */;
-val* var_n_closure_defs /* var n_closure_defs: Collection[Object] */;
-val* var /* : Iterator[nullable Object] */;
-short int var1 /* : Bool */;
-val* var2 /* : nullable Object */;
-val* var_n /* var n: Object */;
-short int var3 /* : Bool */;
-int cltype;
-int idtype;
-val* var4 /* : ANodes[AClosureDef] */;
-var_n_id = p0;
-var_n_args = p1;
-var_n_closure_defs = p2;
-((void (*)(val*))(self->class->vft[COLOR_parser_prod__AClosureCallExpr__empty_init]))(self) /* empty_init on <self:AClosureCallExpr>*/;
-if (var_n_id == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8358);
-exit(1);
-}
-self->attrs[COLOR_parser_nodes__AClosureCallExpr___n_id].val = var_n_id; /* _n_id on <self:AClosureCallExpr> */
-if (var_n_id == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8359);
-exit(1);
-} else {
-((void (*)(val*, val*))(var_n_id->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_id, self) /* parent= on <var_n_id:nullable TId>*/;
-}
-if (var_n_args == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8360);
-exit(1);
-}
-self->attrs[COLOR_parser_nodes__AClosureCallExpr___n_args].val = var_n_args; /* _n_args on <self:AClosureCallExpr> */
-if (var_n_args == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8361);
-exit(1);
-} else {
-((void (*)(val*, val*))(var_n_args->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_args, self) /* parent= on <var_n_args:nullable AExprs>*/;
-}
-var = ((val* (*)(val*))(var_n_closure_defs->class->vft[COLOR_abstract_collection__Collection__iterator]))(var_n_closure_defs) /* iterator on <var_n_closure_defs:Collection[Object]>*/;
-for(;;) {
-var1 = ((short int (*)(val*))(var->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(var) /* is_ok on <var:Iterator[nullable Object]>*/;
-if(!var1) break;
-var2 = ((val* (*)(val*))(var->class->vft[COLOR_abstract_collection__Iterator__item]))(var) /* item on <var:Iterator[nullable Object]>*/;
-var_n = var2;
-/* <var_n:Object> isa AClosureDef */
-cltype = type_parser_nodes__AClosureDef.color;
-idtype = type_parser_nodes__AClosureDef.id;
-if(cltype >= var_n->type->table_size) {
-var3 = 0;
-} else {
-var3 = var_n->type->type_table[cltype] == idtype;
-}
-if (!var3) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8363);
-exit(1);
-}
-var4 = self->attrs[COLOR_parser_nodes__AClosureCallExpr___n_closure_defs].val; /* _n_closure_defs on <self:AClosureCallExpr> */
-if (var4 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_closure_defs", "src/parser/parser_prod.nit", 8364);
-exit(1);
-}
-((void (*)(val*, val*))(var4->class->vft[COLOR_abstract_collection__SimpleCollection__add]))(var4, var_n) /* add on <var4:ANodes[AClosureDef]>*/;
-((void (*)(val*, val*))(var_n->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n, self) /* parent= on <var_n:Object(AClosureDef)>*/;
-CONTINUE_label: (void)0;
-((void (*)(val*))(var->class->vft[COLOR_abstract_collection__Iterator__next]))(var) /* next on <var:Iterator[nullable Object]>*/;
-}
-BREAK_label: (void)0;
-RET_LABEL:;
-}
-/* method parser_prod#AClosureCallExpr#init_aclosurecallexpr for (self: Object, nullable TId, nullable AExprs, Collection[Object]) */
-void VIRTUAL_parser_prod__AClosureCallExpr__init_aclosurecallexpr(val* self, val* p0, val* p1, val* p2) {
-parser_prod__AClosureCallExpr__init_aclosurecallexpr(self, p0, p1, p2);
-RET_LABEL:;
-}
-/* method parser_prod#AClosureCallExpr#replace_child for (self: AClosureCallExpr, ANode, nullable ANode) */
-void parser_prod__AClosureCallExpr__replace_child(val* self, val* p0, val* p1) {
-val* var_old_child /* var old_child: ANode */;
-val* var_new_child /* var new_child: nullable ANode */;
-val* var /* : TId */;
-short int var1 /* : Bool */;
-val* var2 /* : null */;
-short int var3 /* : Bool */;
-short int var4 /* : Bool */;
-int cltype;
-int idtype;
-val* var5 /* : AExprs */;
-short int var6 /* : Bool */;
-val* var7 /* : null */;
-short int var8 /* : Bool */;
-short int var9 /* : Bool */;
-int cltype10;
-int idtype11;
-val* var12 /* : Range[Int] */;
-long var13 /* : Int */;
-val* var14 /* : ANodes[AClosureDef] */;
-long var15 /* : Int */;
-val* var16 /* : Discrete */;
-val* var17 /* : Discrete */;
-val* var18 /* : Iterator[nullable Object] */;
-short int var19 /* : Bool */;
-val* var20 /* : nullable Object */;
-long var_i /* var i: Int */;
-long var21 /* : Int */;
-val* var22 /* : ANodes[AClosureDef] */;
-val* var23 /* : nullable Object */;
-short int var24 /* : Bool */;
-val* var25 /* : null */;
-short int var26 /* : Bool */;
-short int var27 /* : Bool */;
-int cltype28;
-int idtype29;
-val* var30 /* : ANodes[AClosureDef] */;
-val* var31 /* : ANodes[AClosureDef] */;
-var_old_child = p0;
-var_new_child = p1;
-var = self->attrs[COLOR_parser_nodes__AClosureCallExpr___n_id].val; /* _n_id on <self:AClosureCallExpr> */
-if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_id", "src/parser/parser_prod.nit", 8371);
-exit(1);
-}
-var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:TId>*/;
-if (var1){
-var2 = NULL;
-if (var_new_child == NULL) {
-var3 = 0; /* is null */
-} else {
-var3 = 1; /* arg is null and recv is not */
-}
-if (var3){
-((void (*)(val*, val*))(var_new_child->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_new_child, self) /* parent= on <var_new_child:nullable ANode(ANode)>*/;
-/* <var_new_child:nullable ANode(ANode)> isa TId */
-cltype = type_parser_nodes__TId.color;
-idtype = type_parser_nodes__TId.id;
-if(cltype >= var_new_child->type->table_size) {
-var4 = 0;
-} else {
-var4 = var_new_child->type->type_table[cltype] == idtype;
-}
-if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8374);
-exit(1);
-}
-self->attrs[COLOR_parser_nodes__AClosureCallExpr___n_id].val = var_new_child; /* _n_id on <self:AClosureCallExpr> */
-} else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8377);
-exit(1);
-}
-goto RET_LABEL;
-} else {
-}
-var5 = self->attrs[COLOR_parser_nodes__AClosureCallExpr___n_args].val; /* _n_args on <self:AClosureCallExpr> */
-if (var5 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_args", "src/parser/parser_prod.nit", 8381);
-exit(1);
-}
-var6 = ((short int (*)(val*, val*))(var5->class->vft[COLOR_kernel__Object___61d_61d]))(var5, var_old_child) /* == on <var5:AExprs>*/;
-if (var6){
-var7 = NULL;
-if (var_new_child == NULL) {
-var8 = 0; /* is null */
-} else {
-var8 = 1; /* arg is null and recv is not */
-}
-if (var8){
-((void (*)(val*, val*))(var_new_child->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_new_child, self) /* parent= on <var_new_child:nullable ANode(ANode)>*/;
-/* <var_new_child:nullable ANode(ANode)> isa AExprs */
-cltype10 = type_parser_nodes__AExprs.color;
-idtype11 = type_parser_nodes__AExprs.id;
-if(cltype10 >= var_new_child->type->table_size) {
-var9 = 0;
-} else {
-var9 = var_new_child->type->type_table[cltype10] == idtype11;
-}
-if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8384);
-exit(1);
-}
-self->attrs[COLOR_parser_nodes__AClosureCallExpr___n_args].val = var_new_child; /* _n_args on <self:AClosureCallExpr> */
-} else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8387);
-exit(1);
-}
-goto RET_LABEL;
-} else {
-}
-var12 = NEW_range__Range(&type_range__Rangekernel__Int);
-var13 = 0;
-var14 = self->attrs[COLOR_parser_nodes__AClosureCallExpr___n_closure_defs].val; /* _n_closure_defs on <self:AClosureCallExpr> */
-if (var14 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_closure_defs", "src/parser/parser_prod.nit", 8391);
-exit(1);
-}
-var15 = ((long (*)(val*))(var14->class->vft[COLOR_abstract_collection__Collection__length]))(var14) /* length on <var14:ANodes[AClosureDef]>*/;
-var16 = BOX_kernel__Int(var13); /* autobox from Int to Discrete */
-var17 = BOX_kernel__Int(var15); /* autobox from Int to Discrete */
-((void (*)(val*, val*, val*))(var12->class->vft[COLOR_range__Range__without_last]))(var12, var16, var17) /* without_last on <var12:Range[Int]>*/;
-CHECK_NEW_range__Range(var12);
-var18 = ((val* (*)(val*))(var12->class->vft[COLOR_abstract_collection__Collection__iterator]))(var12) /* iterator on <var12:Range[Int]>*/;
-for(;;) {
-var19 = ((short int (*)(val*))(var18->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(var18) /* is_ok on <var18:Iterator[nullable Object]>*/;
-if(!var19) break;
-var20 = ((val* (*)(val*))(var18->class->vft[COLOR_abstract_collection__Iterator__item]))(var18) /* item on <var18:Iterator[nullable Object]>*/;
-var21 = ((struct instance_kernel__Int*)var20)->value; /* autounbox from nullable Object to Int */;
-var_i = var21;
-var22 = self->attrs[COLOR_parser_nodes__AClosureCallExpr___n_closure_defs].val; /* _n_closure_defs on <self:AClosureCallExpr> */
-if (var22 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_closure_defs", "src/parser/parser_prod.nit", 8392);
-exit(1);
-}
-var23 = ((val* (*)(val*, long))(var22->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(var22, var_i) /* [] on <var22:ANodes[AClosureDef]>*/;
-var24 = ((short int (*)(val*, val*))(var23->class->vft[COLOR_kernel__Object___61d_61d]))(var23, var_old_child) /* == on <var23:nullable Object(AClosureDef)>*/;
-if (var24){
-var25 = NULL;
-if (var_new_child == NULL) {
-var26 = 0; /* is null */
-} else {
-var26 = 1; /* arg is null and recv is not */
-}
-if (var26){
-/* <var_new_child:nullable ANode(ANode)> isa AClosureDef */
-cltype28 = type_parser_nodes__AClosureDef.color;
-idtype29 = type_parser_nodes__AClosureDef.id;
-if(cltype28 >= var_new_child->type->table_size) {
-var27 = 0;
-} else {
-var27 = var_new_child->type->type_table[cltype28] == idtype29;
-}
-if (!var27) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8394);
-exit(1);
-}
-var30 = self->attrs[COLOR_parser_nodes__AClosureCallExpr___n_closure_defs].val; /* _n_closure_defs on <self:AClosureCallExpr> */
-if (var30 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_closure_defs", "src/parser/parser_prod.nit", 8395);
-exit(1);
-}
-((void (*)(val*, long, val*))(var30->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(var30, var_i, var_new_child) /* []= on <var30:ANodes[AClosureDef]>*/;
-((void (*)(val*, val*))(var_new_child->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_new_child, self) /* parent= on <var_new_child:nullable ANode(AClosureDef)>*/;
-} else {
-var31 = self->attrs[COLOR_parser_nodes__AClosureCallExpr___n_closure_defs].val; /* _n_closure_defs on <self:AClosureCallExpr> */
-if (var31 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_closure_defs", "src/parser/parser_prod.nit", 8398);
-exit(1);
-}
-((void (*)(val*, long))(var31->class->vft[COLOR_abstract_collection__Sequence__remove_at]))(var31, var_i) /* remove_at on <var31:ANodes[AClosureDef]>*/;
-}
-goto RET_LABEL;
-} else {
-}
-CONTINUE_label: (void)0;
-((void (*)(val*))(var18->class->vft[COLOR_abstract_collection__Iterator__next]))(var18) /* next on <var18:Iterator[nullable Object]>*/;
-}
-BREAK_label: (void)0;
-RET_LABEL:;
-}
-/* method parser_prod#AClosureCallExpr#replace_child for (self: Object, ANode, nullable ANode) */
-void VIRTUAL_parser_prod__AClosureCallExpr__replace_child(val* self, val* p0, val* p1) {
-parser_prod__AClosureCallExpr__replace_child(self, p0, p1);
-RET_LABEL:;
-}
-/* method parser_prod#AClosureCallExpr#n_id= for (self: AClosureCallExpr, TId) */
-void parser_prod__AClosureCallExpr__n_id_61d(val* self, val* p0) {
-val* var_node /* var node: TId */;
-var_node = p0;
-self->attrs[COLOR_parser_nodes__AClosureCallExpr___n_id].val = var_node; /* _n_id on <self:AClosureCallExpr> */
-((void (*)(val*, val*))(var_node->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_node, self) /* parent= on <var_node:TId>*/;
-RET_LABEL:;
-}
-/* method parser_prod#AClosureCallExpr#n_id= for (self: Object, TId) */
-void VIRTUAL_parser_prod__AClosureCallExpr__n_id_61d(val* self, val* p0) {
-parser_prod__AClosureCallExpr__n_id_61d(self, p0);
-RET_LABEL:;
-}
-/* method parser_prod#AClosureCallExpr#n_args= for (self: AClosureCallExpr, AExprs) */
-void parser_prod__AClosureCallExpr__n_args_61d(val* self, val* p0) {
-val* var_node /* var node: AExprs */;
-var_node = p0;
-self->attrs[COLOR_parser_nodes__AClosureCallExpr___n_args].val = var_node; /* _n_args on <self:AClosureCallExpr> */
-((void (*)(val*, val*))(var_node->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_node, self) /* parent= on <var_node:AExprs>*/;
-RET_LABEL:;
-}
-/* method parser_prod#AClosureCallExpr#n_args= for (self: Object, AExprs) */
-void VIRTUAL_parser_prod__AClosureCallExpr__n_args_61d(val* self, val* p0) {
-parser_prod__AClosureCallExpr__n_args_61d(self, p0);
-RET_LABEL:;
-}
-/* method parser_prod#AClosureCallExpr#visit_all for (self: AClosureCallExpr, Visitor) */
-void parser_prod__AClosureCallExpr__visit_all(val* self, val* p0) {
-val* var_v /* var v: Visitor */;
-val* var /* : TId */;
-val* var1 /* : AExprs */;
-val* var2 /* : ANodes[AClosureDef] */;
-val* var3 /* : Iterator[nullable Object] */;
-short int var4 /* : Bool */;
-val* var5 /* : nullable Object */;
-val* var_n /* var n: AClosureDef */;
-var_v = p0;
-var = self->attrs[COLOR_parser_nodes__AClosureCallExpr___n_id].val; /* _n_id on <self:AClosureCallExpr> */
-if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_id", "src/parser/parser_prod.nit", 8419);
-exit(1);
-}
-((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
-var1 = self->attrs[COLOR_parser_nodes__AClosureCallExpr___n_args].val; /* _n_args on <self:AClosureCallExpr> */
-if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_args", "src/parser/parser_prod.nit", 8420);
-exit(1);
-}
-((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var1) /* enter_visit on <var_v:Visitor>*/;
-var2 = self->attrs[COLOR_parser_nodes__AClosureCallExpr___n_closure_defs].val; /* _n_closure_defs on <self:AClosureCallExpr> */
-if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_closure_defs", "src/parser/parser_prod.nit", 8421);
-exit(1);
-}
-var3 = ((val* (*)(val*))(var2->class->vft[COLOR_abstract_collection__Collection__iterator]))(var2) /* iterator on <var2:ANodes[AClosureDef]>*/;
-for(;;) {
-var4 = ((short int (*)(val*))(var3->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(var3) /* is_ok on <var3:Iterator[nullable Object]>*/;
-if(!var4) break;
-var5 = ((val* (*)(val*))(var3->class->vft[COLOR_abstract_collection__Iterator__item]))(var3) /* item on <var3:Iterator[nullable Object]>*/;
-var_n = var5;
-((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var_n) /* enter_visit on <var_v:Visitor>*/;
-CONTINUE_label: (void)0;
-((void (*)(val*))(var3->class->vft[COLOR_abstract_collection__Iterator__next]))(var3) /* next on <var3:Iterator[nullable Object]>*/;
-}
-BREAK_label: (void)0;
-RET_LABEL:;
-}
-/* method parser_prod#AClosureCallExpr#visit_all for (self: Object, Visitor) */
-void VIRTUAL_parser_prod__AClosureCallExpr__visit_all(val* self, val* p0) {
-parser_prod__AClosureCallExpr__visit_all(self, p0);
-RET_LABEL:;
-}
-/* method parser_prod#AVarExpr#empty_init for (self: AVarExpr) */
-void parser_prod__AVarExpr__empty_init(val* self) {
-RET_LABEL:;
-}
-/* method parser_prod#AVarExpr#empty_init for (self: Object) */
-void VIRTUAL_parser_prod__AVarExpr__empty_init(val* self) {
-parser_prod__AVarExpr__empty_init(self);
-RET_LABEL:;
-}
-/* method parser_prod#AVarExpr#init_avarexpr for (self: AVarExpr, nullable TId) */
-void parser_prod__AVarExpr__init_avarexpr(val* self, val* p0) {
+/* method parser_prod#AVarExpr#init_avarexpr for (self: AVarExpr, nullable TId) */
+void parser_prod__AVarExpr__init_avarexpr(val* self, val* p0) {
 val* var_n_id /* var n_id: nullable TId */;
 var_n_id = p0;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__AVarExpr__empty_init]))(self) /* empty_init on <self:AVarExpr>*/;
 if (var_n_id == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8434);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8110);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AVarFormExpr___n_id].val = var_n_id; /* _n_id on <self:AVarExpr> */
 if (var_n_id == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8435);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8111);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_id->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_id, self) /* parent= on <var_n_id:nullable TId>*/;
 }
@@ -1448,8 +1347,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__AVarFormExpr___n_id].val; /* _n_id on <self:AVarExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_id", "src/parser/parser_prod.nit", 8440);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_id");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8116);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:TId>*/;
 if (var1){
@@ -1470,13 +1370,15 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8443);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8119);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AVarFormExpr___n_id].val = var_new_child; /* _n_id on <self:AVarExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8446);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8122);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -1508,8 +1410,9 @@ val* var /* : TId */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__AVarFormExpr___n_id].val; /* _n_id on <self:AVarExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_id", "src/parser/parser_prod.nit", 8461);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_id");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8137);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 RET_LABEL:;
@@ -1538,35 +1441,41 @@ var_n_assign = p1;
 var_n_value = p2;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__AVarAssignExpr__empty_init]))(self) /* empty_init on <self:AVarAssignExpr>*/;
 if (var_n_id == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8474);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8150);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AVarFormExpr___n_id].val = var_n_id; /* _n_id on <self:AVarAssignExpr> */
 if (var_n_id == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8475);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8151);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_id->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_id, self) /* parent= on <var_n_id:nullable TId>*/;
 }
 if (var_n_assign == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8476);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8152);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAssignFormExpr___n_assign].val = var_n_assign; /* _n_assign on <self:AVarAssignExpr> */
 if (var_n_assign == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8477);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8153);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_assign->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_assign, self) /* parent= on <var_n_assign:nullable TAssign>*/;
 }
 if (var_n_value == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8478);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8154);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAssignFormExpr___n_value].val = var_n_value; /* _n_value on <self:AVarAssignExpr> */
 if (var_n_value == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8479);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8155);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_value->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_value, self) /* parent= on <var_n_value:nullable AExpr>*/;
 }
@@ -1606,8 +1515,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__AVarFormExpr___n_id].val; /* _n_id on <self:AVarAssignExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_id", "src/parser/parser_prod.nit", 8484);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_id");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8160);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:TId>*/;
 if (var1){
@@ -1628,21 +1538,24 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8487);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8163);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AVarFormExpr___n_id].val = var_new_child; /* _n_id on <self:AVarAssignExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8490);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8166);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var5 = self->attrs[COLOR_parser_nodes__AAssignFormExpr___n_assign].val; /* _n_assign on <self:AVarAssignExpr> */
 if (var5 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_assign", "src/parser/parser_prod.nit", 8494);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_assign");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8170);
+show_backtrace(1);
 }
 var6 = ((short int (*)(val*, val*))(var5->class->vft[COLOR_kernel__Object___61d_61d]))(var5, var_old_child) /* == on <var5:TAssign>*/;
 if (var6){
@@ -1663,21 +1576,24 @@ var9 = 0;
 var9 = var_new_child->type->type_table[cltype10] == idtype11;
 }
 if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8497);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8173);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAssignFormExpr___n_assign].val = var_new_child; /* _n_assign on <self:AVarAssignExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8500);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8176);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var12 = self->attrs[COLOR_parser_nodes__AAssignFormExpr___n_value].val; /* _n_value on <self:AVarAssignExpr> */
 if (var12 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_value", "src/parser/parser_prod.nit", 8504);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_value");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8180);
+show_backtrace(1);
 }
 var13 = ((short int (*)(val*, val*))(var12->class->vft[COLOR_kernel__Object___61d_61d]))(var12, var_old_child) /* == on <var12:AExpr>*/;
 if (var13){
@@ -1698,13 +1614,15 @@ var16 = 0;
 var16 = var_new_child->type->type_table[cltype17] == idtype18;
 }
 if (!var16) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8507);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8183);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAssignFormExpr___n_value].val = var_new_child; /* _n_value on <self:AVarAssignExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8510);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8186);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -1764,20 +1682,23 @@ val* var2 /* : AExpr */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__AVarFormExpr___n_id].val; /* _n_id on <self:AVarAssignExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_id", "src/parser/parser_prod.nit", 8535);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_id");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8211);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 var1 = self->attrs[COLOR_parser_nodes__AAssignFormExpr___n_assign].val; /* _n_assign on <self:AVarAssignExpr> */
 if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_assign", "src/parser/parser_prod.nit", 8536);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_assign");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8212);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var1) /* enter_visit on <var_v:Visitor>*/;
 var2 = self->attrs[COLOR_parser_nodes__AAssignFormExpr___n_value].val; /* _n_value on <self:AVarAssignExpr> */
 if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_value", "src/parser/parser_prod.nit", 8537);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_value");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8213);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var2) /* enter_visit on <var_v:Visitor>*/;
 RET_LABEL:;
@@ -1806,35 +1727,41 @@ var_n_assign_op = p1;
 var_n_value = p2;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__AVarReassignExpr__empty_init]))(self) /* empty_init on <self:AVarReassignExpr>*/;
 if (var_n_id == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8550);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8226);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AVarFormExpr___n_id].val = var_n_id; /* _n_id on <self:AVarReassignExpr> */
 if (var_n_id == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8551);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8227);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_id->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_id, self) /* parent= on <var_n_id:nullable TId>*/;
 }
 if (var_n_assign_op == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8552);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8228);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AReassignFormExpr___n_assign_op].val = var_n_assign_op; /* _n_assign_op on <self:AVarReassignExpr> */
 if (var_n_assign_op == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8553);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8229);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_assign_op->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_assign_op, self) /* parent= on <var_n_assign_op:nullable AAssignOp>*/;
 }
 if (var_n_value == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8554);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8230);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AReassignFormExpr___n_value].val = var_n_value; /* _n_value on <self:AVarReassignExpr> */
 if (var_n_value == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8555);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8231);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_value->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_value, self) /* parent= on <var_n_value:nullable AExpr>*/;
 }
@@ -1874,8 +1801,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__AVarFormExpr___n_id].val; /* _n_id on <self:AVarReassignExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_id", "src/parser/parser_prod.nit", 8560);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_id");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8236);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:TId>*/;
 if (var1){
@@ -1896,21 +1824,24 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8563);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8239);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AVarFormExpr___n_id].val = var_new_child; /* _n_id on <self:AVarReassignExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8566);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8242);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var5 = self->attrs[COLOR_parser_nodes__AReassignFormExpr___n_assign_op].val; /* _n_assign_op on <self:AVarReassignExpr> */
 if (var5 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_assign_op", "src/parser/parser_prod.nit", 8570);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_assign_op");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8246);
+show_backtrace(1);
 }
 var6 = ((short int (*)(val*, val*))(var5->class->vft[COLOR_kernel__Object___61d_61d]))(var5, var_old_child) /* == on <var5:AAssignOp>*/;
 if (var6){
@@ -1931,21 +1862,24 @@ var9 = 0;
 var9 = var_new_child->type->type_table[cltype10] == idtype11;
 }
 if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8573);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8249);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AReassignFormExpr___n_assign_op].val = var_new_child; /* _n_assign_op on <self:AVarReassignExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8576);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8252);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var12 = self->attrs[COLOR_parser_nodes__AReassignFormExpr___n_value].val; /* _n_value on <self:AVarReassignExpr> */
 if (var12 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_value", "src/parser/parser_prod.nit", 8580);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_value");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8256);
+show_backtrace(1);
 }
 var13 = ((short int (*)(val*, val*))(var12->class->vft[COLOR_kernel__Object___61d_61d]))(var12, var_old_child) /* == on <var12:AExpr>*/;
 if (var13){
@@ -1966,13 +1900,15 @@ var16 = 0;
 var16 = var_new_child->type->type_table[cltype17] == idtype18;
 }
 if (!var16) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8583);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8259);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AReassignFormExpr___n_value].val = var_new_child; /* _n_value on <self:AVarReassignExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8586);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8262);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -2032,20 +1968,23 @@ val* var2 /* : AExpr */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__AVarFormExpr___n_id].val; /* _n_id on <self:AVarReassignExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_id", "src/parser/parser_prod.nit", 8611);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_id");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8287);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 var1 = self->attrs[COLOR_parser_nodes__AReassignFormExpr___n_assign_op].val; /* _n_assign_op on <self:AVarReassignExpr> */
 if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_assign_op", "src/parser/parser_prod.nit", 8612);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_assign_op");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8288);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var1) /* enter_visit on <var_v:Visitor>*/;
 var2 = self->attrs[COLOR_parser_nodes__AReassignFormExpr___n_value].val; /* _n_value on <self:AVarReassignExpr> */
 if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_value", "src/parser/parser_prod.nit", 8613);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_value");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8289);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var2) /* enter_visit on <var_v:Visitor>*/;
 RET_LABEL:;
@@ -2076,24 +2015,28 @@ var_n_expr2 = p1;
 var_n_annotations = p2;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__ARangeExpr__empty_init]))(self) /* empty_init on <self:ARangeExpr>*/;
 if (var_n_expr == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8626);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8302);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ARangeExpr___n_expr].val = var_n_expr; /* _n_expr on <self:ARangeExpr> */
 if (var_n_expr == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8627);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8303);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_expr->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_expr, self) /* parent= on <var_n_expr:nullable AExpr>*/;
 }
 if (var_n_expr2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8628);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8304);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ARangeExpr___n_expr2].val = var_n_expr2; /* _n_expr2 on <self:ARangeExpr> */
 if (var_n_expr2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8629);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8305);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_expr2->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_expr2, self) /* parent= on <var_n_expr2:nullable AExpr>*/;
 }
@@ -2145,8 +2088,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__ARangeExpr___n_expr].val; /* _n_expr on <self:ARangeExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr", "src/parser/parser_prod.nit", 8638);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8314);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:AExpr>*/;
 if (var1){
@@ -2167,21 +2111,24 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8641);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8317);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ARangeExpr___n_expr].val = var_new_child; /* _n_expr on <self:ARangeExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8644);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8320);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var5 = self->attrs[COLOR_parser_nodes__ARangeExpr___n_expr2].val; /* _n_expr2 on <self:ARangeExpr> */
 if (var5 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr2", "src/parser/parser_prod.nit", 8648);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr2");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8324);
+show_backtrace(1);
 }
 var6 = ((short int (*)(val*, val*))(var5->class->vft[COLOR_kernel__Object___61d_61d]))(var5, var_old_child) /* == on <var5:AExpr>*/;
 if (var6){
@@ -2202,13 +2149,15 @@ var9 = 0;
 var9 = var_new_child->type->type_table[cltype10] == idtype11;
 }
 if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8651);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8327);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ARangeExpr___n_expr2].val = var_new_child; /* _n_expr2 on <self:ARangeExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8654);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8330);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -2237,8 +2186,9 @@ var16 = 0;
 var16 = var_new_child->type->type_table[cltype17] == idtype18;
 }
 if (!var16) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8661);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8337);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__Prod___n_annotations].val = var_new_child; /* _n_annotations on <self:ARangeExpr> */
 } else {
@@ -2317,14 +2267,16 @@ val* var5 /* : nullable AAnnotations */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__ARangeExpr___n_expr].val; /* _n_expr on <self:ARangeExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr", "src/parser/parser_prod.nit", 8691);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8367);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 var1 = self->attrs[COLOR_parser_nodes__ARangeExpr___n_expr2].val; /* _n_expr2 on <self:ARangeExpr> */
 if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr2", "src/parser/parser_prod.nit", 8692);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr2");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8368);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var1) /* enter_visit on <var_v:Visitor>*/;
 var2 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:ARangeExpr> */
@@ -2337,8 +2289,9 @@ var4 = 1; /* arg is null and recv is not */
 if (var4){
 var5 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:ARangeExpr> */
 if (var5 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8694);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8370);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var5) /* enter_visit on <var_v:Visitor>*/;
 } else {
@@ -2375,46 +2328,54 @@ var_n_cbra = p3;
 var_n_annotations = p4;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__ACrangeExpr__empty_init]))(self) /* empty_init on <self:ACrangeExpr>*/;
 if (var_n_obra == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8710);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8386);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ACrangeExpr___n_obra].val = var_n_obra; /* _n_obra on <self:ACrangeExpr> */
 if (var_n_obra == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8711);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8387);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_obra->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_obra, self) /* parent= on <var_n_obra:nullable TObra>*/;
 }
 if (var_n_expr == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8712);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8388);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ARangeExpr___n_expr].val = var_n_expr; /* _n_expr on <self:ACrangeExpr> */
 if (var_n_expr == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8713);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8389);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_expr->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_expr, self) /* parent= on <var_n_expr:nullable AExpr>*/;
 }
 if (var_n_expr2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8714);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8390);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ARangeExpr___n_expr2].val = var_n_expr2; /* _n_expr2 on <self:ACrangeExpr> */
 if (var_n_expr2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8715);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8391);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_expr2->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_expr2, self) /* parent= on <var_n_expr2:nullable AExpr>*/;
 }
 if (var_n_cbra == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8716);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8392);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ACrangeExpr___n_cbra].val = var_n_cbra; /* _n_cbra on <self:ACrangeExpr> */
 if (var_n_cbra == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8717);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8393);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_cbra->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_cbra, self) /* parent= on <var_n_cbra:nullable TCbra>*/;
 }
@@ -2480,8 +2441,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__ACrangeExpr___n_obra].val; /* _n_obra on <self:ACrangeExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_obra", "src/parser/parser_prod.nit", 8726);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_obra");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8402);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:TObra>*/;
 if (var1){
@@ -2502,21 +2464,24 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8729);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8405);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ACrangeExpr___n_obra].val = var_new_child; /* _n_obra on <self:ACrangeExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8732);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8408);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var5 = self->attrs[COLOR_parser_nodes__ARangeExpr___n_expr].val; /* _n_expr on <self:ACrangeExpr> */
 if (var5 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr", "src/parser/parser_prod.nit", 8736);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8412);
+show_backtrace(1);
 }
 var6 = ((short int (*)(val*, val*))(var5->class->vft[COLOR_kernel__Object___61d_61d]))(var5, var_old_child) /* == on <var5:AExpr>*/;
 if (var6){
@@ -2537,21 +2502,24 @@ var9 = 0;
 var9 = var_new_child->type->type_table[cltype10] == idtype11;
 }
 if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8739);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8415);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ARangeExpr___n_expr].val = var_new_child; /* _n_expr on <self:ACrangeExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8742);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8418);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var12 = self->attrs[COLOR_parser_nodes__ARangeExpr___n_expr2].val; /* _n_expr2 on <self:ACrangeExpr> */
 if (var12 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr2", "src/parser/parser_prod.nit", 8746);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr2");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8422);
+show_backtrace(1);
 }
 var13 = ((short int (*)(val*, val*))(var12->class->vft[COLOR_kernel__Object___61d_61d]))(var12, var_old_child) /* == on <var12:AExpr>*/;
 if (var13){
@@ -2572,21 +2540,24 @@ var16 = 0;
 var16 = var_new_child->type->type_table[cltype17] == idtype18;
 }
 if (!var16) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8749);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8425);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ARangeExpr___n_expr2].val = var_new_child; /* _n_expr2 on <self:ACrangeExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8752);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8428);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var19 = self->attrs[COLOR_parser_nodes__ACrangeExpr___n_cbra].val; /* _n_cbra on <self:ACrangeExpr> */
 if (var19 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_cbra", "src/parser/parser_prod.nit", 8756);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_cbra");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8432);
+show_backtrace(1);
 }
 var20 = ((short int (*)(val*, val*))(var19->class->vft[COLOR_kernel__Object___61d_61d]))(var19, var_old_child) /* == on <var19:TCbra>*/;
 if (var20){
@@ -2607,13 +2578,15 @@ var23 = 0;
 var23 = var_new_child->type->type_table[cltype24] == idtype25;
 }
 if (!var23) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8759);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8435);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ACrangeExpr___n_cbra].val = var_new_child; /* _n_cbra on <self:ACrangeExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8762);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8438);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -2642,8 +2615,9 @@ var30 = 0;
 var30 = var_new_child->type->type_table[cltype31] == idtype32;
 }
 if (!var30) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8769);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8445);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__Prod___n_annotations].val = var_new_child; /* _n_annotations on <self:ACrangeExpr> */
 } else {
@@ -2750,26 +2724,30 @@ val* var7 /* : nullable AAnnotations */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__ACrangeExpr___n_obra].val; /* _n_obra on <self:ACrangeExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_obra", "src/parser/parser_prod.nit", 8809);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_obra");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8485);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 var1 = self->attrs[COLOR_parser_nodes__ARangeExpr___n_expr].val; /* _n_expr on <self:ACrangeExpr> */
 if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr", "src/parser/parser_prod.nit", 8810);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8486);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var1) /* enter_visit on <var_v:Visitor>*/;
 var2 = self->attrs[COLOR_parser_nodes__ARangeExpr___n_expr2].val; /* _n_expr2 on <self:ACrangeExpr> */
 if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr2", "src/parser/parser_prod.nit", 8811);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr2");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8487);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var2) /* enter_visit on <var_v:Visitor>*/;
 var3 = self->attrs[COLOR_parser_nodes__ACrangeExpr___n_cbra].val; /* _n_cbra on <self:ACrangeExpr> */
 if (var3 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_cbra", "src/parser/parser_prod.nit", 8812);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_cbra");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8488);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var3) /* enter_visit on <var_v:Visitor>*/;
 var4 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:ACrangeExpr> */
@@ -2782,8 +2760,9 @@ var6 = 1; /* arg is null and recv is not */
 if (var6){
 var7 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:ACrangeExpr> */
 if (var7 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8814);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8490);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var7) /* enter_visit on <var_v:Visitor>*/;
 } else {
@@ -2820,46 +2799,54 @@ var_n_cbra = p3;
 var_n_annotations = p4;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__AOrangeExpr__empty_init]))(self) /* empty_init on <self:AOrangeExpr>*/;
 if (var_n_obra == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8830);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8506);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AOrangeExpr___n_obra].val = var_n_obra; /* _n_obra on <self:AOrangeExpr> */
 if (var_n_obra == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8831);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8507);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_obra->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_obra, self) /* parent= on <var_n_obra:nullable TObra>*/;
 }
 if (var_n_expr == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8832);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8508);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ARangeExpr___n_expr].val = var_n_expr; /* _n_expr on <self:AOrangeExpr> */
 if (var_n_expr == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8833);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8509);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_expr->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_expr, self) /* parent= on <var_n_expr:nullable AExpr>*/;
 }
 if (var_n_expr2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8834);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8510);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ARangeExpr___n_expr2].val = var_n_expr2; /* _n_expr2 on <self:AOrangeExpr> */
 if (var_n_expr2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8835);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8511);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_expr2->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_expr2, self) /* parent= on <var_n_expr2:nullable AExpr>*/;
 }
 if (var_n_cbra == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8836);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8512);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AOrangeExpr___n_cbra].val = var_n_cbra; /* _n_cbra on <self:AOrangeExpr> */
 if (var_n_cbra == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8837);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8513);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_cbra->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_cbra, self) /* parent= on <var_n_cbra:nullable TObra>*/;
 }
@@ -2925,8 +2912,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__AOrangeExpr___n_obra].val; /* _n_obra on <self:AOrangeExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_obra", "src/parser/parser_prod.nit", 8846);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_obra");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8522);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:TObra>*/;
 if (var1){
@@ -2947,21 +2935,24 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8849);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8525);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AOrangeExpr___n_obra].val = var_new_child; /* _n_obra on <self:AOrangeExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8852);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8528);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var5 = self->attrs[COLOR_parser_nodes__ARangeExpr___n_expr].val; /* _n_expr on <self:AOrangeExpr> */
 if (var5 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr", "src/parser/parser_prod.nit", 8856);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8532);
+show_backtrace(1);
 }
 var6 = ((short int (*)(val*, val*))(var5->class->vft[COLOR_kernel__Object___61d_61d]))(var5, var_old_child) /* == on <var5:AExpr>*/;
 if (var6){
@@ -2982,21 +2973,24 @@ var9 = 0;
 var9 = var_new_child->type->type_table[cltype10] == idtype11;
 }
 if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8859);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8535);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ARangeExpr___n_expr].val = var_new_child; /* _n_expr on <self:AOrangeExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8862);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8538);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var12 = self->attrs[COLOR_parser_nodes__ARangeExpr___n_expr2].val; /* _n_expr2 on <self:AOrangeExpr> */
 if (var12 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr2", "src/parser/parser_prod.nit", 8866);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr2");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8542);
+show_backtrace(1);
 }
 var13 = ((short int (*)(val*, val*))(var12->class->vft[COLOR_kernel__Object___61d_61d]))(var12, var_old_child) /* == on <var12:AExpr>*/;
 if (var13){
@@ -3017,21 +3011,24 @@ var16 = 0;
 var16 = var_new_child->type->type_table[cltype17] == idtype18;
 }
 if (!var16) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8869);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8545);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ARangeExpr___n_expr2].val = var_new_child; /* _n_expr2 on <self:AOrangeExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8872);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8548);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var19 = self->attrs[COLOR_parser_nodes__AOrangeExpr___n_cbra].val; /* _n_cbra on <self:AOrangeExpr> */
 if (var19 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_cbra", "src/parser/parser_prod.nit", 8876);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_cbra");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8552);
+show_backtrace(1);
 }
 var20 = ((short int (*)(val*, val*))(var19->class->vft[COLOR_kernel__Object___61d_61d]))(var19, var_old_child) /* == on <var19:TObra>*/;
 if (var20){
@@ -3052,13 +3049,15 @@ var23 = 0;
 var23 = var_new_child->type->type_table[cltype24] == idtype25;
 }
 if (!var23) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8879);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8555);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AOrangeExpr___n_cbra].val = var_new_child; /* _n_cbra on <self:AOrangeExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8882);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8558);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -3087,8 +3086,9 @@ var30 = 0;
 var30 = var_new_child->type->type_table[cltype31] == idtype32;
 }
 if (!var30) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8889);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8565);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__Prod___n_annotations].val = var_new_child; /* _n_annotations on <self:AOrangeExpr> */
 } else {
@@ -3195,26 +3195,30 @@ val* var7 /* : nullable AAnnotations */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__AOrangeExpr___n_obra].val; /* _n_obra on <self:AOrangeExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_obra", "src/parser/parser_prod.nit", 8929);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_obra");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8605);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 var1 = self->attrs[COLOR_parser_nodes__ARangeExpr___n_expr].val; /* _n_expr on <self:AOrangeExpr> */
 if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr", "src/parser/parser_prod.nit", 8930);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8606);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var1) /* enter_visit on <var_v:Visitor>*/;
 var2 = self->attrs[COLOR_parser_nodes__ARangeExpr___n_expr2].val; /* _n_expr2 on <self:AOrangeExpr> */
 if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr2", "src/parser/parser_prod.nit", 8931);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr2");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8607);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var2) /* enter_visit on <var_v:Visitor>*/;
 var3 = self->attrs[COLOR_parser_nodes__AOrangeExpr___n_cbra].val; /* _n_cbra on <self:AOrangeExpr> */
 if (var3 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_cbra", "src/parser/parser_prod.nit", 8932);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_cbra");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8608);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var3) /* enter_visit on <var_v:Visitor>*/;
 var4 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:AOrangeExpr> */
@@ -3227,8 +3231,9 @@ var6 = 1; /* arg is null and recv is not */
 if (var6){
 var7 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:AOrangeExpr> */
 if (var7 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8934);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8610);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var7) /* enter_visit on <var_v:Visitor>*/;
 } else {
@@ -3259,13 +3264,15 @@ var_n_exprs = p0;
 var_n_annotations = p1;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__AArrayExpr__empty_init]))(self) /* empty_init on <self:AArrayExpr>*/;
 if (var_n_exprs == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8947);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8623);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AArrayExpr___n_exprs].val = var_n_exprs; /* _n_exprs on <self:AArrayExpr> */
 if (var_n_exprs == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 8948);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8624);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_exprs->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_exprs, self) /* parent= on <var_n_exprs:nullable AExprs>*/;
 }
@@ -3310,8 +3317,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__AArrayExpr___n_exprs].val; /* _n_exprs on <self:AArrayExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 8957);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8633);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:AExprs>*/;
 if (var1){
@@ -3332,13 +3340,15 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8960);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8636);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AArrayExpr___n_exprs].val = var_new_child; /* _n_exprs on <self:AArrayExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 8963);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8639);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -3367,8 +3377,9 @@ var9 = 0;
 var9 = var_new_child->type->type_table[cltype10] == idtype11;
 }
 if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 8970);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8646);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__Prod___n_annotations].val = var_new_child; /* _n_annotations on <self:AArrayExpr> */
 } else {
@@ -3433,8 +3444,9 @@ val* var4 /* : nullable AAnnotations */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__AArrayExpr___n_exprs].val; /* _n_exprs on <self:AArrayExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 8995);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8671);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 var1 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:AArrayExpr> */
@@ -3447,8 +3459,9 @@ var3 = 1; /* arg is null and recv is not */
 if (var3){
 var4 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:AArrayExpr> */
 if (var4 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 8997);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8673);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var4) /* enter_visit on <var_v:Visitor>*/;
 } else {
@@ -3479,13 +3492,15 @@ var_n_kwself = p0;
 var_n_annotations = p1;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__ASelfExpr__empty_init]))(self) /* empty_init on <self:ASelfExpr>*/;
 if (var_n_kwself == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9010);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8686);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ASelfExpr___n_kwself].val = var_n_kwself; /* _n_kwself on <self:ASelfExpr> */
 if (var_n_kwself == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9011);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8687);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_kwself->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_kwself, self) /* parent= on <var_n_kwself:nullable TKwself>*/;
 }
@@ -3552,13 +3567,15 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9023);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8699);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ASelfExpr___n_kwself].val = var_new_child; /* _n_kwself on <self:ASelfExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 9026);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8702);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -3587,8 +3604,9 @@ var9 = 0;
 var9 = var_new_child->type->type_table[cltype10] == idtype11;
 }
 if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9033);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8709);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__Prod___n_annotations].val = var_new_child; /* _n_annotations on <self:ASelfExpr> */
 } else {
@@ -3611,8 +3629,9 @@ val* var_node /* var node: nullable TKwself */;
 var_node = p0;
 self->attrs[COLOR_parser_nodes__ASelfExpr___n_kwself].val = var_node; /* _n_kwself on <self:ASelfExpr> */
 if (var_node == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9045);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8721);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_node->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_node, self) /* parent= on <var_node:nullable TKwself>*/;
 }
@@ -3668,8 +3687,9 @@ var3 = 1; /* arg is null and recv is not */
 if (var3){
 var4 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:ASelfExpr> */
 if (var4 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9060);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8736);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var4) /* enter_visit on <var_v:Visitor>*/;
 } else {
@@ -3743,13 +3763,15 @@ var_n_kwtrue = p0;
 var_n_annotations = p1;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__ATrueExpr__empty_init]))(self) /* empty_init on <self:ATrueExpr>*/;
 if (var_n_kwtrue == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9091);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8767);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ATrueExpr___n_kwtrue].val = var_n_kwtrue; /* _n_kwtrue on <self:ATrueExpr> */
 if (var_n_kwtrue == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9092);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8768);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_kwtrue->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_kwtrue, self) /* parent= on <var_n_kwtrue:nullable TKwtrue>*/;
 }
@@ -3794,8 +3816,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__ATrueExpr___n_kwtrue].val; /* _n_kwtrue on <self:ATrueExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_kwtrue", "src/parser/parser_prod.nit", 9101);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwtrue");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8777);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:TKwtrue>*/;
 if (var1){
@@ -3816,13 +3839,15 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9104);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8780);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ATrueExpr___n_kwtrue].val = var_new_child; /* _n_kwtrue on <self:ATrueExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 9107);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8783);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -3851,8 +3876,9 @@ var9 = 0;
 var9 = var_new_child->type->type_table[cltype10] == idtype11;
 }
 if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9114);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8790);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__Prod___n_annotations].val = var_new_child; /* _n_annotations on <self:ATrueExpr> */
 } else {
@@ -3917,8 +3943,9 @@ val* var4 /* : nullable AAnnotations */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__ATrueExpr___n_kwtrue].val; /* _n_kwtrue on <self:ATrueExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_kwtrue", "src/parser/parser_prod.nit", 9139);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwtrue");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8815);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 var1 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:ATrueExpr> */
@@ -3931,8 +3958,9 @@ var3 = 1; /* arg is null and recv is not */
 if (var3){
 var4 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:ATrueExpr> */
 if (var4 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9141);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8817);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var4) /* enter_visit on <var_v:Visitor>*/;
 } else {
@@ -3963,13 +3991,15 @@ var_n_kwfalse = p0;
 var_n_annotations = p1;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__AFalseExpr__empty_init]))(self) /* empty_init on <self:AFalseExpr>*/;
 if (var_n_kwfalse == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9154);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8830);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AFalseExpr___n_kwfalse].val = var_n_kwfalse; /* _n_kwfalse on <self:AFalseExpr> */
 if (var_n_kwfalse == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9155);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8831);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_kwfalse->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_kwfalse, self) /* parent= on <var_n_kwfalse:nullable TKwfalse>*/;
 }
@@ -4014,8 +4044,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__AFalseExpr___n_kwfalse].val; /* _n_kwfalse on <self:AFalseExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_kwfalse", "src/parser/parser_prod.nit", 9164);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwfalse");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8840);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:TKwfalse>*/;
 if (var1){
@@ -4036,13 +4067,15 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9167);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8843);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AFalseExpr___n_kwfalse].val = var_new_child; /* _n_kwfalse on <self:AFalseExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 9170);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8846);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -4071,8 +4104,9 @@ var9 = 0;
 var9 = var_new_child->type->type_table[cltype10] == idtype11;
 }
 if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9177);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8853);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__Prod___n_annotations].val = var_new_child; /* _n_annotations on <self:AFalseExpr> */
 } else {
@@ -4137,8 +4171,9 @@ val* var4 /* : nullable AAnnotations */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__AFalseExpr___n_kwfalse].val; /* _n_kwfalse on <self:AFalseExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_kwfalse", "src/parser/parser_prod.nit", 9202);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwfalse");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8878);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 var1 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:AFalseExpr> */
@@ -4151,8 +4186,9 @@ var3 = 1; /* arg is null and recv is not */
 if (var3){
 var4 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:AFalseExpr> */
 if (var4 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9204);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8880);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var4) /* enter_visit on <var_v:Visitor>*/;
 } else {
@@ -4183,13 +4219,15 @@ var_n_kwnull = p0;
 var_n_annotations = p1;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__ANullExpr__empty_init]))(self) /* empty_init on <self:ANullExpr>*/;
 if (var_n_kwnull == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9217);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8893);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ANullExpr___n_kwnull].val = var_n_kwnull; /* _n_kwnull on <self:ANullExpr> */
 if (var_n_kwnull == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9218);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8894);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_kwnull->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_kwnull, self) /* parent= on <var_n_kwnull:nullable TKwnull>*/;
 }
@@ -4234,8 +4272,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__ANullExpr___n_kwnull].val; /* _n_kwnull on <self:ANullExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_kwnull", "src/parser/parser_prod.nit", 9227);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwnull");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8903);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:TKwnull>*/;
 if (var1){
@@ -4256,13 +4295,15 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9230);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8906);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ANullExpr___n_kwnull].val = var_new_child; /* _n_kwnull on <self:ANullExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 9233);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8909);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -4291,8 +4332,9 @@ var9 = 0;
 var9 = var_new_child->type->type_table[cltype10] == idtype11;
 }
 if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9240);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8916);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__Prod___n_annotations].val = var_new_child; /* _n_annotations on <self:ANullExpr> */
 } else {
@@ -4357,8 +4399,9 @@ val* var4 /* : nullable AAnnotations */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__ANullExpr___n_kwnull].val; /* _n_kwnull on <self:ANullExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_kwnull", "src/parser/parser_prod.nit", 9265);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwnull");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8941);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 var1 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:ANullExpr> */
@@ -4371,8 +4414,9 @@ var3 = 1; /* arg is null and recv is not */
 if (var3){
 var4 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:ANullExpr> */
 if (var4 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9267);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8943);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var4) /* enter_visit on <var_v:Visitor>*/;
 } else {
@@ -4403,13 +4447,15 @@ var_n_number = p0;
 var_n_annotations = p1;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__AIntExpr__empty_init]))(self) /* empty_init on <self:AIntExpr>*/;
 if (var_n_number == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9280);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8956);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AIntExpr___n_number].val = var_n_number; /* _n_number on <self:AIntExpr> */
 if (var_n_number == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9281);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8957);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_number->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_number, self) /* parent= on <var_n_number:nullable TNumber>*/;
 }
@@ -4454,8 +4500,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__AIntExpr___n_number].val; /* _n_number on <self:AIntExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_number", "src/parser/parser_prod.nit", 9290);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_number");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8966);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:TNumber>*/;
 if (var1){
@@ -4476,13 +4523,15 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9293);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8969);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AIntExpr___n_number].val = var_new_child; /* _n_number on <self:AIntExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 9296);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8972);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -4511,8 +4560,9 @@ var9 = 0;
 var9 = var_new_child->type->type_table[cltype10] == idtype11;
 }
 if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9303);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 8979);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__Prod___n_annotations].val = var_new_child; /* _n_annotations on <self:AIntExpr> */
 } else {
@@ -4577,8 +4627,9 @@ val* var4 /* : nullable AAnnotations */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__AIntExpr___n_number].val; /* _n_number on <self:AIntExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_number", "src/parser/parser_prod.nit", 9328);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_number");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9004);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 var1 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:AIntExpr> */
@@ -4591,8 +4642,9 @@ var3 = 1; /* arg is null and recv is not */
 if (var3){
 var4 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:AIntExpr> */
 if (var4 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9330);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9006);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var4) /* enter_visit on <var_v:Visitor>*/;
 } else {
@@ -4623,13 +4675,15 @@ var_n_float = p0;
 var_n_annotations = p1;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__AFloatExpr__empty_init]))(self) /* empty_init on <self:AFloatExpr>*/;
 if (var_n_float == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9343);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9019);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AFloatExpr___n_float].val = var_n_float; /* _n_float on <self:AFloatExpr> */
 if (var_n_float == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9344);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9020);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_float->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_float, self) /* parent= on <var_n_float:nullable TFloat>*/;
 }
@@ -4674,8 +4728,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__AFloatExpr___n_float].val; /* _n_float on <self:AFloatExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_float", "src/parser/parser_prod.nit", 9353);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_float");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9029);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:TFloat>*/;
 if (var1){
@@ -4696,13 +4751,15 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9356);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9032);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AFloatExpr___n_float].val = var_new_child; /* _n_float on <self:AFloatExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 9359);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9035);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -4731,8 +4788,9 @@ var9 = 0;
 var9 = var_new_child->type->type_table[cltype10] == idtype11;
 }
 if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9366);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9042);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__Prod___n_annotations].val = var_new_child; /* _n_annotations on <self:AFloatExpr> */
 } else {
@@ -4797,8 +4855,9 @@ val* var4 /* : nullable AAnnotations */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__AFloatExpr___n_float].val; /* _n_float on <self:AFloatExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_float", "src/parser/parser_prod.nit", 9391);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_float");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9067);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 var1 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:AFloatExpr> */
@@ -4811,8 +4870,9 @@ var3 = 1; /* arg is null and recv is not */
 if (var3){
 var4 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:AFloatExpr> */
 if (var4 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9393);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9069);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var4) /* enter_visit on <var_v:Visitor>*/;
 } else {
@@ -4843,13 +4903,15 @@ var_n_char = p0;
 var_n_annotations = p1;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__ACharExpr__empty_init]))(self) /* empty_init on <self:ACharExpr>*/;
 if (var_n_char == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9406);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9082);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ACharExpr___n_char].val = var_n_char; /* _n_char on <self:ACharExpr> */
 if (var_n_char == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9407);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9083);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_char->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_char, self) /* parent= on <var_n_char:nullable TChar>*/;
 }
@@ -4894,8 +4956,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__ACharExpr___n_char].val; /* _n_char on <self:ACharExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_char", "src/parser/parser_prod.nit", 9416);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_char");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9092);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:TChar>*/;
 if (var1){
@@ -4916,13 +4979,15 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9419);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9095);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ACharExpr___n_char].val = var_new_child; /* _n_char on <self:ACharExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 9422);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9098);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -4951,8 +5016,9 @@ var9 = 0;
 var9 = var_new_child->type->type_table[cltype10] == idtype11;
 }
 if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9429);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9105);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__Prod___n_annotations].val = var_new_child; /* _n_annotations on <self:ACharExpr> */
 } else {
@@ -5017,8 +5083,9 @@ val* var4 /* : nullable AAnnotations */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__ACharExpr___n_char].val; /* _n_char on <self:ACharExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_char", "src/parser/parser_prod.nit", 9454);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_char");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9130);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 var1 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:ACharExpr> */
@@ -5031,8 +5098,9 @@ var3 = 1; /* arg is null and recv is not */
 if (var3){
 var4 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:ACharExpr> */
 if (var4 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9456);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9132);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var4) /* enter_visit on <var_v:Visitor>*/;
 } else {
@@ -5063,13 +5131,15 @@ var_n_string = p0;
 var_n_annotations = p1;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__AStringExpr__empty_init]))(self) /* empty_init on <self:AStringExpr>*/;
 if (var_n_string == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9469);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9145);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AStringFormExpr___n_string].val = var_n_string; /* _n_string on <self:AStringExpr> */
 if (var_n_string == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9470);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9146);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_string->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_string, self) /* parent= on <var_n_string:nullable TString>*/;
 }
@@ -5114,8 +5184,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__AStringFormExpr___n_string].val; /* _n_string on <self:AStringExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_string", "src/parser/parser_prod.nit", 9479);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_string");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9155);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:Token>*/;
 if (var1){
@@ -5136,13 +5207,15 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9482);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9158);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AStringFormExpr___n_string].val = var_new_child; /* _n_string on <self:AStringExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 9485);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9161);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -5171,8 +5244,9 @@ var9 = 0;
 var9 = var_new_child->type->type_table[cltype10] == idtype11;
 }
 if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9492);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9168);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__Prod___n_annotations].val = var_new_child; /* _n_annotations on <self:AStringExpr> */
 } else {
@@ -5237,8 +5311,9 @@ val* var4 /* : nullable AAnnotations */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__AStringFormExpr___n_string].val; /* _n_string on <self:AStringExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_string", "src/parser/parser_prod.nit", 9517);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_string");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9193);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 var1 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:AStringExpr> */
@@ -5251,8 +5326,9 @@ var3 = 1; /* arg is null and recv is not */
 if (var3){
 var4 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:AStringExpr> */
 if (var4 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9519);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9195);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var4) /* enter_visit on <var_v:Visitor>*/;
 } else {
@@ -5279,13 +5355,15 @@ val* var_n_string /* var n_string: nullable TStartString */;
 var_n_string = p0;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__AStartStringExpr__empty_init]))(self) /* empty_init on <self:AStartStringExpr>*/;
 if (var_n_string == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9531);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9207);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AStringFormExpr___n_string].val = var_n_string; /* _n_string on <self:AStartStringExpr> */
 if (var_n_string == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9532);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9208);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_string->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_string, self) /* parent= on <var_n_string:nullable TStartString>*/;
 }
@@ -5311,8 +5389,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__AStringFormExpr___n_string].val; /* _n_string on <self:AStartStringExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_string", "src/parser/parser_prod.nit", 9537);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_string");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9213);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:Token>*/;
 if (var1){
@@ -5333,13 +5412,15 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9540);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9216);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AStringFormExpr___n_string].val = var_new_child; /* _n_string on <self:AStartStringExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 9543);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9219);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -5371,8 +5452,9 @@ val* var /* : Token */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__AStringFormExpr___n_string].val; /* _n_string on <self:AStartStringExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_string", "src/parser/parser_prod.nit", 9558);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_string");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9234);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 RET_LABEL:;
@@ -5397,13 +5479,15 @@ val* var_n_string /* var n_string: nullable TMidString */;
 var_n_string = p0;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__AMidStringExpr__empty_init]))(self) /* empty_init on <self:AMidStringExpr>*/;
 if (var_n_string == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9569);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9245);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AStringFormExpr___n_string].val = var_n_string; /* _n_string on <self:AMidStringExpr> */
 if (var_n_string == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9570);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9246);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_string->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_string, self) /* parent= on <var_n_string:nullable TMidString>*/;
 }
@@ -5429,8 +5513,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__AStringFormExpr___n_string].val; /* _n_string on <self:AMidStringExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_string", "src/parser/parser_prod.nit", 9575);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_string");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9251);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:Token>*/;
 if (var1){
@@ -5451,13 +5536,15 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9578);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9254);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AStringFormExpr___n_string].val = var_new_child; /* _n_string on <self:AMidStringExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 9581);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9257);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -5489,8 +5576,9 @@ val* var /* : Token */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__AStringFormExpr___n_string].val; /* _n_string on <self:AMidStringExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_string", "src/parser/parser_prod.nit", 9596);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_string");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9272);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 RET_LABEL:;
@@ -5515,13 +5603,15 @@ val* var_n_string /* var n_string: nullable TEndString */;
 var_n_string = p0;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__AEndStringExpr__empty_init]))(self) /* empty_init on <self:AEndStringExpr>*/;
 if (var_n_string == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9607);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9283);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AStringFormExpr___n_string].val = var_n_string; /* _n_string on <self:AEndStringExpr> */
 if (var_n_string == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9608);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9284);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_string->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_string, self) /* parent= on <var_n_string:nullable TEndString>*/;
 }
@@ -5547,8 +5637,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__AStringFormExpr___n_string].val; /* _n_string on <self:AEndStringExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_string", "src/parser/parser_prod.nit", 9613);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_string");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9289);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:Token>*/;
 if (var1){
@@ -5569,13 +5660,15 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9616);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9292);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AStringFormExpr___n_string].val = var_new_child; /* _n_string on <self:AEndStringExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 9619);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9295);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -5607,8 +5700,9 @@ val* var /* : Token */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__AStringFormExpr___n_string].val; /* _n_string on <self:AEndStringExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_string", "src/parser/parser_prod.nit", 9634);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_string");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9310);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 RET_LABEL:;
@@ -5659,13 +5753,15 @@ var3 = 0;
 var3 = var_n->type->type_table[cltype] == idtype;
 }
 if (!var3) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9647);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9323);
+show_backtrace(1);
 }
 var4 = self->attrs[COLOR_parser_nodes__ASuperstringExpr___n_exprs].val; /* _n_exprs on <self:ASuperstringExpr> */
 if (var4 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 9648);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9324);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var4->class->vft[COLOR_abstract_collection__SimpleCollection__add]))(var4, var_n) /* add on <var4:ANodes[AExpr]>*/;
 ((void (*)(val*, val*))(var_n->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n, self) /* parent= on <var_n:Object(AExpr)>*/;
@@ -5730,14 +5826,14 @@ var = NEW_range__Range(&type_range__Rangekernel__Int);
 var1 = 0;
 var2 = self->attrs[COLOR_parser_nodes__ASuperstringExpr___n_exprs].val; /* _n_exprs on <self:ASuperstringExpr> */
 if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 9659);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9335);
+show_backtrace(1);
 }
 var3 = ((long (*)(val*))(var2->class->vft[COLOR_abstract_collection__Collection__length]))(var2) /* length on <var2:ANodes[AExpr]>*/;
 var4 = BOX_kernel__Int(var1); /* autobox from Int to Discrete */
 var5 = BOX_kernel__Int(var3); /* autobox from Int to Discrete */
 ((void (*)(val*, val*, val*))(var->class->vft[COLOR_range__Range__without_last]))(var, var4, var5) /* without_last on <var:Range[Int]>*/;
-CHECK_NEW_range__Range(var);
 var6 = ((val* (*)(val*))(var->class->vft[COLOR_abstract_collection__Collection__iterator]))(var) /* iterator on <var:Range[Int]>*/;
 for(;;) {
 var7 = ((short int (*)(val*))(var6->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(var6) /* is_ok on <var6:Iterator[nullable Object]>*/;
@@ -5747,8 +5843,9 @@ var9 = ((struct instance_kernel__Int*)var8)->value; /* autounbox from nullable O
 var_i = var9;
 var10 = self->attrs[COLOR_parser_nodes__ASuperstringExpr___n_exprs].val; /* _n_exprs on <self:ASuperstringExpr> */
 if (var10 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 9660);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9336);
+show_backtrace(1);
 }
 var11 = ((val* (*)(val*, long))(var10->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(var10, var_i) /* [] on <var10:ANodes[AExpr]>*/;
 var12 = ((short int (*)(val*, val*))(var11->class->vft[COLOR_kernel__Object___61d_61d]))(var11, var_old_child) /* == on <var11:nullable Object(AExpr)>*/;
@@ -5769,21 +5866,24 @@ var15 = 0;
 var15 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var15) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9662);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9338);
+show_backtrace(1);
 }
 var16 = self->attrs[COLOR_parser_nodes__ASuperstringExpr___n_exprs].val; /* _n_exprs on <self:ASuperstringExpr> */
 if (var16 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 9663);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9339);
+show_backtrace(1);
 }
 ((void (*)(val*, long, val*))(var16->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(var16, var_i, var_new_child) /* []= on <var16:ANodes[AExpr]>*/;
 ((void (*)(val*, val*))(var_new_child->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_new_child, self) /* parent= on <var_new_child:nullable ANode(AExpr)>*/;
 } else {
 var17 = self->attrs[COLOR_parser_nodes__ASuperstringExpr___n_exprs].val; /* _n_exprs on <self:ASuperstringExpr> */
 if (var17 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 9666);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9342);
+show_backtrace(1);
 }
 ((void (*)(val*, long))(var17->class->vft[COLOR_abstract_collection__Sequence__remove_at]))(var17, var_i) /* remove_at on <var17:ANodes[AExpr]>*/;
 }
@@ -5818,8 +5918,9 @@ var22 = 0;
 var22 = var_new_child->type->type_table[cltype23] == idtype24;
 }
 if (!var22) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9674);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9350);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__Prod___n_annotations].val = var_new_child; /* _n_annotations on <self:ASuperstringExpr> */
 } else {
@@ -5875,8 +5976,9 @@ val* var7 /* : nullable AAnnotations */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__ASuperstringExpr___n_exprs].val; /* _n_exprs on <self:ASuperstringExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 9694);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9370);
+show_backtrace(1);
 }
 var1 = ((val* (*)(val*))(var->class->vft[COLOR_abstract_collection__Collection__iterator]))(var) /* iterator on <var:ANodes[AExpr]>*/;
 for(;;) {
@@ -5899,8 +6001,9 @@ var6 = 1; /* arg is null and recv is not */
 if (var6){
 var7 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:ASuperstringExpr> */
 if (var7 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9698);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9374);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var7) /* enter_visit on <var_v:Visitor>*/;
 } else {
@@ -5935,35 +6038,41 @@ var_n_cpar = p2;
 var_n_annotations = p3;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__AParExpr__empty_init]))(self) /* empty_init on <self:AParExpr>*/;
 if (var_n_opar == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9713);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9389);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AParExpr___n_opar].val = var_n_opar; /* _n_opar on <self:AParExpr> */
 if (var_n_opar == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9714);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9390);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_opar->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_opar, self) /* parent= on <var_n_opar:nullable TOpar>*/;
 }
 if (var_n_expr == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9715);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9391);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AProxyExpr___n_expr].val = var_n_expr; /* _n_expr on <self:AParExpr> */
 if (var_n_expr == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9716);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9392);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_expr->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_expr, self) /* parent= on <var_n_expr:nullable AExpr>*/;
 }
 if (var_n_cpar == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9717);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9393);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AParExpr___n_cpar].val = var_n_cpar; /* _n_cpar on <self:AParExpr> */
 if (var_n_cpar == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9718);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9394);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_cpar->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_cpar, self) /* parent= on <var_n_cpar:nullable TCpar>*/;
 }
@@ -6022,8 +6131,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__AParExpr___n_opar].val; /* _n_opar on <self:AParExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_opar", "src/parser/parser_prod.nit", 9727);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_opar");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9403);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:TOpar>*/;
 if (var1){
@@ -6044,21 +6154,24 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9730);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9406);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AParExpr___n_opar].val = var_new_child; /* _n_opar on <self:AParExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 9733);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9409);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var5 = self->attrs[COLOR_parser_nodes__AProxyExpr___n_expr].val; /* _n_expr on <self:AParExpr> */
 if (var5 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr", "src/parser/parser_prod.nit", 9737);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9413);
+show_backtrace(1);
 }
 var6 = ((short int (*)(val*, val*))(var5->class->vft[COLOR_kernel__Object___61d_61d]))(var5, var_old_child) /* == on <var5:AExpr>*/;
 if (var6){
@@ -6079,21 +6192,24 @@ var9 = 0;
 var9 = var_new_child->type->type_table[cltype10] == idtype11;
 }
 if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9740);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9416);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AProxyExpr___n_expr].val = var_new_child; /* _n_expr on <self:AParExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 9743);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9419);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var12 = self->attrs[COLOR_parser_nodes__AParExpr___n_cpar].val; /* _n_cpar on <self:AParExpr> */
 if (var12 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_cpar", "src/parser/parser_prod.nit", 9747);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_cpar");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9423);
+show_backtrace(1);
 }
 var13 = ((short int (*)(val*, val*))(var12->class->vft[COLOR_kernel__Object___61d_61d]))(var12, var_old_child) /* == on <var12:TCpar>*/;
 if (var13){
@@ -6114,13 +6230,15 @@ var16 = 0;
 var16 = var_new_child->type->type_table[cltype17] == idtype18;
 }
 if (!var16) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9750);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9426);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AParExpr___n_cpar].val = var_new_child; /* _n_cpar on <self:AParExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 9753);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9429);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -6149,8 +6267,9 @@ var23 = 0;
 var23 = var_new_child->type->type_table[cltype24] == idtype25;
 }
 if (!var23) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9760);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9436);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__Prod___n_annotations].val = var_new_child; /* _n_annotations on <self:AParExpr> */
 } else {
@@ -6243,20 +6362,23 @@ val* var6 /* : nullable AAnnotations */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__AParExpr___n_opar].val; /* _n_opar on <self:AParExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_opar", "src/parser/parser_prod.nit", 9795);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_opar");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9471);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 var1 = self->attrs[COLOR_parser_nodes__AProxyExpr___n_expr].val; /* _n_expr on <self:AParExpr> */
 if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr", "src/parser/parser_prod.nit", 9796);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9472);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var1) /* enter_visit on <var_v:Visitor>*/;
 var2 = self->attrs[COLOR_parser_nodes__AParExpr___n_cpar].val; /* _n_cpar on <self:AParExpr> */
 if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_cpar", "src/parser/parser_prod.nit", 9797);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_cpar");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9473);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var2) /* enter_visit on <var_v:Visitor>*/;
 var3 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:AParExpr> */
@@ -6269,8 +6391,9 @@ var5 = 1; /* arg is null and recv is not */
 if (var5){
 var6 = self->attrs[COLOR_parser_nodes__Prod___n_annotations].val; /* _n_annotations on <self:AParExpr> */
 if (var6 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9799);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9475);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var6) /* enter_visit on <var_v:Visitor>*/;
 } else {
@@ -6305,57 +6428,67 @@ var_n_type = p3;
 var_n_cpar = p4;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__AAsCastExpr__empty_init]))(self) /* empty_init on <self:AAsCastExpr>*/;
 if (var_n_expr == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9815);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9491);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAsCastExpr___n_expr].val = var_n_expr; /* _n_expr on <self:AAsCastExpr> */
 if (var_n_expr == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9816);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9492);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_expr->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_expr, self) /* parent= on <var_n_expr:nullable AExpr>*/;
 }
 if (var_n_kwas == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9817);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9493);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAsCastExpr___n_kwas].val = var_n_kwas; /* _n_kwas on <self:AAsCastExpr> */
 if (var_n_kwas == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9818);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9494);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_kwas->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_kwas, self) /* parent= on <var_n_kwas:nullable TKwas>*/;
 }
 if (var_n_opar == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9819);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9495);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAsCastExpr___n_opar].val = var_n_opar; /* _n_opar on <self:AAsCastExpr> */
 if (var_n_opar == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9820);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9496);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_opar->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_opar, self) /* parent= on <var_n_opar:nullable TOpar>*/;
 }
 if (var_n_type == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9821);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9497);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAsCastExpr___n_type].val = var_n_type; /* _n_type on <self:AAsCastExpr> */
 if (var_n_type == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9822);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9498);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_type->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_type, self) /* parent= on <var_n_type:nullable AType>*/;
 }
 if (var_n_cpar == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9823);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9499);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAsCastExpr___n_cpar].val = var_n_cpar; /* _n_cpar on <self:AAsCastExpr> */
 if (var_n_cpar == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9824);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9500);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_cpar->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_cpar, self) /* parent= on <var_n_cpar:nullable TCpar>*/;
 }
@@ -6409,8 +6542,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__AAsCastExpr___n_expr].val; /* _n_expr on <self:AAsCastExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr", "src/parser/parser_prod.nit", 9829);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9505);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:AExpr>*/;
 if (var1){
@@ -6431,21 +6565,24 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9832);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9508);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAsCastExpr___n_expr].val = var_new_child; /* _n_expr on <self:AAsCastExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 9835);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9511);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var5 = self->attrs[COLOR_parser_nodes__AAsCastExpr___n_kwas].val; /* _n_kwas on <self:AAsCastExpr> */
 if (var5 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_kwas", "src/parser/parser_prod.nit", 9839);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwas");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9515);
+show_backtrace(1);
 }
 var6 = ((short int (*)(val*, val*))(var5->class->vft[COLOR_kernel__Object___61d_61d]))(var5, var_old_child) /* == on <var5:TKwas>*/;
 if (var6){
@@ -6466,21 +6603,24 @@ var9 = 0;
 var9 = var_new_child->type->type_table[cltype10] == idtype11;
 }
 if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9842);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9518);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAsCastExpr___n_kwas].val = var_new_child; /* _n_kwas on <self:AAsCastExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 9845);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9521);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var12 = self->attrs[COLOR_parser_nodes__AAsCastExpr___n_opar].val; /* _n_opar on <self:AAsCastExpr> */
 if (var12 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_opar", "src/parser/parser_prod.nit", 9849);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_opar");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9525);
+show_backtrace(1);
 }
 var13 = ((short int (*)(val*, val*))(var12->class->vft[COLOR_kernel__Object___61d_61d]))(var12, var_old_child) /* == on <var12:TOpar>*/;
 if (var13){
@@ -6501,21 +6641,24 @@ var16 = 0;
 var16 = var_new_child->type->type_table[cltype17] == idtype18;
 }
 if (!var16) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9852);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9528);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAsCastExpr___n_opar].val = var_new_child; /* _n_opar on <self:AAsCastExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 9855);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9531);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var19 = self->attrs[COLOR_parser_nodes__AAsCastExpr___n_type].val; /* _n_type on <self:AAsCastExpr> */
 if (var19 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_type", "src/parser/parser_prod.nit", 9859);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_type");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9535);
+show_backtrace(1);
 }
 var20 = ((short int (*)(val*, val*))(var19->class->vft[COLOR_kernel__Object___61d_61d]))(var19, var_old_child) /* == on <var19:AType>*/;
 if (var20){
@@ -6536,21 +6679,24 @@ var23 = 0;
 var23 = var_new_child->type->type_table[cltype24] == idtype25;
 }
 if (!var23) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9862);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9538);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAsCastExpr___n_type].val = var_new_child; /* _n_type on <self:AAsCastExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 9865);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9541);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var26 = self->attrs[COLOR_parser_nodes__AAsCastExpr___n_cpar].val; /* _n_cpar on <self:AAsCastExpr> */
 if (var26 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_cpar", "src/parser/parser_prod.nit", 9869);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_cpar");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9545);
+show_backtrace(1);
 }
 var27 = ((short int (*)(val*, val*))(var26->class->vft[COLOR_kernel__Object___61d_61d]))(var26, var_old_child) /* == on <var26:TCpar>*/;
 if (var27){
@@ -6571,13 +6717,15 @@ var30 = 0;
 var30 = var_new_child->type->type_table[cltype31] == idtype32;
 }
 if (!var30) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9872);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9548);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAsCastExpr___n_cpar].val = var_new_child; /* _n_cpar on <self:AAsCastExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 9875);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9551);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -6665,32 +6813,37 @@ val* var4 /* : TCpar */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__AAsCastExpr___n_expr].val; /* _n_expr on <self:AAsCastExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr", "src/parser/parser_prod.nit", 9910);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9586);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 var1 = self->attrs[COLOR_parser_nodes__AAsCastExpr___n_kwas].val; /* _n_kwas on <self:AAsCastExpr> */
 if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_kwas", "src/parser/parser_prod.nit", 9911);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwas");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9587);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var1) /* enter_visit on <var_v:Visitor>*/;
 var2 = self->attrs[COLOR_parser_nodes__AAsCastExpr___n_opar].val; /* _n_opar on <self:AAsCastExpr> */
 if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_opar", "src/parser/parser_prod.nit", 9912);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_opar");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9588);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var2) /* enter_visit on <var_v:Visitor>*/;
 var3 = self->attrs[COLOR_parser_nodes__AAsCastExpr___n_type].val; /* _n_type on <self:AAsCastExpr> */
 if (var3 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_type", "src/parser/parser_prod.nit", 9913);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_type");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9589);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var3) /* enter_visit on <var_v:Visitor>*/;
 var4 = self->attrs[COLOR_parser_nodes__AAsCastExpr___n_cpar].val; /* _n_cpar on <self:AAsCastExpr> */
 if (var4 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_cpar", "src/parser/parser_prod.nit", 9914);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_cpar");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9590);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var4) /* enter_visit on <var_v:Visitor>*/;
 RET_LABEL:;
@@ -6725,68 +6878,80 @@ var_n_kwnull = p4;
 var_n_cpar = p5;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__AAsNotnullExpr__empty_init]))(self) /* empty_init on <self:AAsNotnullExpr>*/;
 if (var_n_expr == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9930);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9606);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAsNotnullExpr___n_expr].val = var_n_expr; /* _n_expr on <self:AAsNotnullExpr> */
 if (var_n_expr == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9931);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9607);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_expr->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_expr, self) /* parent= on <var_n_expr:nullable AExpr>*/;
 }
 if (var_n_kwas == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9932);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9608);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAsNotnullExpr___n_kwas].val = var_n_kwas; /* _n_kwas on <self:AAsNotnullExpr> */
 if (var_n_kwas == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9933);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9609);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_kwas->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_kwas, self) /* parent= on <var_n_kwas:nullable TKwas>*/;
 }
 if (var_n_opar == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9934);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9610);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAsNotnullExpr___n_opar].val = var_n_opar; /* _n_opar on <self:AAsNotnullExpr> */
 if (var_n_opar == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9935);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9611);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_opar->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_opar, self) /* parent= on <var_n_opar:nullable TOpar>*/;
 }
 if (var_n_kwnot == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9936);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9612);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAsNotnullExpr___n_kwnot].val = var_n_kwnot; /* _n_kwnot on <self:AAsNotnullExpr> */
 if (var_n_kwnot == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9937);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9613);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_kwnot->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_kwnot, self) /* parent= on <var_n_kwnot:nullable TKwnot>*/;
 }
 if (var_n_kwnull == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9938);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9614);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAsNotnullExpr___n_kwnull].val = var_n_kwnull; /* _n_kwnull on <self:AAsNotnullExpr> */
 if (var_n_kwnull == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9939);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9615);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_kwnull->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_kwnull, self) /* parent= on <var_n_kwnull:nullable TKwnull>*/;
 }
 if (var_n_cpar == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 9940);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9616);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAsNotnullExpr___n_cpar].val = var_n_cpar; /* _n_cpar on <self:AAsNotnullExpr> */
 if (var_n_cpar == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 9941);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9617);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_cpar->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_cpar, self) /* parent= on <var_n_cpar:nullable TCpar>*/;
 }
@@ -6847,8 +7012,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__AAsNotnullExpr___n_expr].val; /* _n_expr on <self:AAsNotnullExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr", "src/parser/parser_prod.nit", 9946);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9622);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:AExpr>*/;
 if (var1){
@@ -6869,21 +7035,24 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9949);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9625);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAsNotnullExpr___n_expr].val = var_new_child; /* _n_expr on <self:AAsNotnullExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 9952);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9628);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var5 = self->attrs[COLOR_parser_nodes__AAsNotnullExpr___n_kwas].val; /* _n_kwas on <self:AAsNotnullExpr> */
 if (var5 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_kwas", "src/parser/parser_prod.nit", 9956);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwas");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9632);
+show_backtrace(1);
 }
 var6 = ((short int (*)(val*, val*))(var5->class->vft[COLOR_kernel__Object___61d_61d]))(var5, var_old_child) /* == on <var5:TKwas>*/;
 if (var6){
@@ -6904,21 +7073,24 @@ var9 = 0;
 var9 = var_new_child->type->type_table[cltype10] == idtype11;
 }
 if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9959);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9635);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAsNotnullExpr___n_kwas].val = var_new_child; /* _n_kwas on <self:AAsNotnullExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 9962);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9638);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var12 = self->attrs[COLOR_parser_nodes__AAsNotnullExpr___n_opar].val; /* _n_opar on <self:AAsNotnullExpr> */
 if (var12 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_opar", "src/parser/parser_prod.nit", 9966);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_opar");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9642);
+show_backtrace(1);
 }
 var13 = ((short int (*)(val*, val*))(var12->class->vft[COLOR_kernel__Object___61d_61d]))(var12, var_old_child) /* == on <var12:TOpar>*/;
 if (var13){
@@ -6939,21 +7111,24 @@ var16 = 0;
 var16 = var_new_child->type->type_table[cltype17] == idtype18;
 }
 if (!var16) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9969);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9645);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAsNotnullExpr___n_opar].val = var_new_child; /* _n_opar on <self:AAsNotnullExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 9972);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9648);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var19 = self->attrs[COLOR_parser_nodes__AAsNotnullExpr___n_kwnot].val; /* _n_kwnot on <self:AAsNotnullExpr> */
 if (var19 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_kwnot", "src/parser/parser_prod.nit", 9976);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwnot");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9652);
+show_backtrace(1);
 }
 var20 = ((short int (*)(val*, val*))(var19->class->vft[COLOR_kernel__Object___61d_61d]))(var19, var_old_child) /* == on <var19:TKwnot>*/;
 if (var20){
@@ -6974,21 +7149,24 @@ var23 = 0;
 var23 = var_new_child->type->type_table[cltype24] == idtype25;
 }
 if (!var23) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9979);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9655);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAsNotnullExpr___n_kwnot].val = var_new_child; /* _n_kwnot on <self:AAsNotnullExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 9982);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9658);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var26 = self->attrs[COLOR_parser_nodes__AAsNotnullExpr___n_kwnull].val; /* _n_kwnull on <self:AAsNotnullExpr> */
 if (var26 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_kwnull", "src/parser/parser_prod.nit", 9986);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwnull");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9662);
+show_backtrace(1);
 }
 var27 = ((short int (*)(val*, val*))(var26->class->vft[COLOR_kernel__Object___61d_61d]))(var26, var_old_child) /* == on <var26:TKwnull>*/;
 if (var27){
@@ -7009,21 +7187,24 @@ var30 = 0;
 var30 = var_new_child->type->type_table[cltype31] == idtype32;
 }
 if (!var30) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9989);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9665);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAsNotnullExpr___n_kwnull].val = var_new_child; /* _n_kwnull on <self:AAsNotnullExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 9992);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9668);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var33 = self->attrs[COLOR_parser_nodes__AAsNotnullExpr___n_cpar].val; /* _n_cpar on <self:AAsNotnullExpr> */
 if (var33 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_cpar", "src/parser/parser_prod.nit", 9996);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_cpar");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9672);
+show_backtrace(1);
 }
 var34 = ((short int (*)(val*, val*))(var33->class->vft[COLOR_kernel__Object___61d_61d]))(var33, var_old_child) /* == on <var33:TCpar>*/;
 if (var34){
@@ -7044,13 +7225,15 @@ var37 = 0;
 var37 = var_new_child->type->type_table[cltype38] == idtype39;
 }
 if (!var37) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 9999);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9675);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAsNotnullExpr___n_cpar].val = var_new_child; /* _n_cpar on <self:AAsNotnullExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 10002);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9678);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -7152,38 +7335,44 @@ val* var5 /* : TCpar */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__AAsNotnullExpr___n_expr].val; /* _n_expr on <self:AAsNotnullExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr", "src/parser/parser_prod.nit", 10042);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9718);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 var1 = self->attrs[COLOR_parser_nodes__AAsNotnullExpr___n_kwas].val; /* _n_kwas on <self:AAsNotnullExpr> */
 if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_kwas", "src/parser/parser_prod.nit", 10043);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwas");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9719);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var1) /* enter_visit on <var_v:Visitor>*/;
 var2 = self->attrs[COLOR_parser_nodes__AAsNotnullExpr___n_opar].val; /* _n_opar on <self:AAsNotnullExpr> */
 if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_opar", "src/parser/parser_prod.nit", 10044);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_opar");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9720);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var2) /* enter_visit on <var_v:Visitor>*/;
 var3 = self->attrs[COLOR_parser_nodes__AAsNotnullExpr___n_kwnot].val; /* _n_kwnot on <self:AAsNotnullExpr> */
 if (var3 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_kwnot", "src/parser/parser_prod.nit", 10045);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwnot");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9721);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var3) /* enter_visit on <var_v:Visitor>*/;
 var4 = self->attrs[COLOR_parser_nodes__AAsNotnullExpr___n_kwnull].val; /* _n_kwnull on <self:AAsNotnullExpr> */
 if (var4 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_kwnull", "src/parser/parser_prod.nit", 10046);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwnull");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9722);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var4) /* enter_visit on <var_v:Visitor>*/;
 var5 = self->attrs[COLOR_parser_nodes__AAsNotnullExpr___n_cpar].val; /* _n_cpar on <self:AAsNotnullExpr> */
 if (var5 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_cpar", "src/parser/parser_prod.nit", 10047);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_cpar");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9723);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var5) /* enter_visit on <var_v:Visitor>*/;
 RET_LABEL:;
@@ -7212,35 +7401,41 @@ var_n_expr = p1;
 var_n_id = p2;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__AIssetAttrExpr__empty_init]))(self) /* empty_init on <self:AIssetAttrExpr>*/;
 if (var_n_kwisset == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 10060);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9736);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AIssetAttrExpr___n_kwisset].val = var_n_kwisset; /* _n_kwisset on <self:AIssetAttrExpr> */
 if (var_n_kwisset == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 10061);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9737);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_kwisset->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_kwisset, self) /* parent= on <var_n_kwisset:nullable TKwisset>*/;
 }
 if (var_n_expr == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 10062);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9738);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAttrFormExpr___n_expr].val = var_n_expr; /* _n_expr on <self:AIssetAttrExpr> */
 if (var_n_expr == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 10063);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9739);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_expr->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_expr, self) /* parent= on <var_n_expr:nullable AExpr>*/;
 }
 if (var_n_id == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 10064);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9740);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAttrFormExpr___n_id].val = var_n_id; /* _n_id on <self:AIssetAttrExpr> */
 if (var_n_id == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 10065);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9741);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_id->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_id, self) /* parent= on <var_n_id:nullable TAttrid>*/;
 }
@@ -7280,8 +7475,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__AIssetAttrExpr___n_kwisset].val; /* _n_kwisset on <self:AIssetAttrExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_kwisset", "src/parser/parser_prod.nit", 10070);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwisset");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9746);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:TKwisset>*/;
 if (var1){
@@ -7302,21 +7498,24 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10073);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9749);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AIssetAttrExpr___n_kwisset].val = var_new_child; /* _n_kwisset on <self:AIssetAttrExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 10076);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9752);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var5 = self->attrs[COLOR_parser_nodes__AAttrFormExpr___n_expr].val; /* _n_expr on <self:AIssetAttrExpr> */
 if (var5 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr", "src/parser/parser_prod.nit", 10080);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9756);
+show_backtrace(1);
 }
 var6 = ((short int (*)(val*, val*))(var5->class->vft[COLOR_kernel__Object___61d_61d]))(var5, var_old_child) /* == on <var5:AExpr>*/;
 if (var6){
@@ -7337,21 +7536,24 @@ var9 = 0;
 var9 = var_new_child->type->type_table[cltype10] == idtype11;
 }
 if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10083);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9759);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAttrFormExpr___n_expr].val = var_new_child; /* _n_expr on <self:AIssetAttrExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 10086);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9762);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var12 = self->attrs[COLOR_parser_nodes__AAttrFormExpr___n_id].val; /* _n_id on <self:AIssetAttrExpr> */
 if (var12 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_id", "src/parser/parser_prod.nit", 10090);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_id");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9766);
+show_backtrace(1);
 }
 var13 = ((short int (*)(val*, val*))(var12->class->vft[COLOR_kernel__Object___61d_61d]))(var12, var_old_child) /* == on <var12:TAttrid>*/;
 if (var13){
@@ -7372,13 +7574,15 @@ var16 = 0;
 var16 = var_new_child->type->type_table[cltype17] == idtype18;
 }
 if (!var16) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10093);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9769);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AAttrFormExpr___n_id].val = var_new_child; /* _n_id on <self:AIssetAttrExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 10096);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9772);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -7438,20 +7642,23 @@ val* var2 /* : TAttrid */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__AIssetAttrExpr___n_kwisset].val; /* _n_kwisset on <self:AIssetAttrExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_kwisset", "src/parser/parser_prod.nit", 10121);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwisset");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9797);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 var1 = self->attrs[COLOR_parser_nodes__AAttrFormExpr___n_expr].val; /* _n_expr on <self:AIssetAttrExpr> */
 if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr", "src/parser/parser_prod.nit", 10122);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9798);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var1) /* enter_visit on <var_v:Visitor>*/;
 var2 = self->attrs[COLOR_parser_nodes__AAttrFormExpr___n_id].val; /* _n_id on <self:AIssetAttrExpr> */
 if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_id", "src/parser/parser_prod.nit", 10123);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_id");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9799);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var2) /* enter_visit on <var_v:Visitor>*/;
 RET_LABEL:;
@@ -7482,46 +7689,54 @@ var_n_expr = p2;
 var_n_type = p3;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__ADebugTypeExpr__empty_init]))(self) /* empty_init on <self:ADebugTypeExpr>*/;
 if (var_n_kwdebug == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 10137);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9813);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ADebugTypeExpr___n_kwdebug].val = var_n_kwdebug; /* _n_kwdebug on <self:ADebugTypeExpr> */
 if (var_n_kwdebug == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 10138);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9814);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_kwdebug->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_kwdebug, self) /* parent= on <var_n_kwdebug:nullable TKwdebug>*/;
 }
 if (var_n_kwtype == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 10139);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9815);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ADebugTypeExpr___n_kwtype].val = var_n_kwtype; /* _n_kwtype on <self:ADebugTypeExpr> */
 if (var_n_kwtype == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 10140);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9816);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_kwtype->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_kwtype, self) /* parent= on <var_n_kwtype:nullable TKwtype>*/;
 }
 if (var_n_expr == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 10141);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9817);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ADebugTypeExpr___n_expr].val = var_n_expr; /* _n_expr on <self:ADebugTypeExpr> */
 if (var_n_expr == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 10142);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9818);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_expr->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_expr, self) /* parent= on <var_n_expr:nullable AExpr>*/;
 }
 if (var_n_type == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 10143);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9819);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ADebugTypeExpr___n_type].val = var_n_type; /* _n_type on <self:ADebugTypeExpr> */
 if (var_n_type == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 10144);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9820);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_type->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_type, self) /* parent= on <var_n_type:nullable AType>*/;
 }
@@ -7568,8 +7783,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__ADebugTypeExpr___n_kwdebug].val; /* _n_kwdebug on <self:ADebugTypeExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_kwdebug", "src/parser/parser_prod.nit", 10149);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwdebug");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9825);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:TKwdebug>*/;
 if (var1){
@@ -7590,21 +7806,24 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10152);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9828);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ADebugTypeExpr___n_kwdebug].val = var_new_child; /* _n_kwdebug on <self:ADebugTypeExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 10155);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9831);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var5 = self->attrs[COLOR_parser_nodes__ADebugTypeExpr___n_kwtype].val; /* _n_kwtype on <self:ADebugTypeExpr> */
 if (var5 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_kwtype", "src/parser/parser_prod.nit", 10159);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwtype");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9835);
+show_backtrace(1);
 }
 var6 = ((short int (*)(val*, val*))(var5->class->vft[COLOR_kernel__Object___61d_61d]))(var5, var_old_child) /* == on <var5:TKwtype>*/;
 if (var6){
@@ -7625,21 +7844,24 @@ var9 = 0;
 var9 = var_new_child->type->type_table[cltype10] == idtype11;
 }
 if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10162);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9838);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ADebugTypeExpr___n_kwtype].val = var_new_child; /* _n_kwtype on <self:ADebugTypeExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 10165);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9841);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var12 = self->attrs[COLOR_parser_nodes__ADebugTypeExpr___n_expr].val; /* _n_expr on <self:ADebugTypeExpr> */
 if (var12 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr", "src/parser/parser_prod.nit", 10169);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9845);
+show_backtrace(1);
 }
 var13 = ((short int (*)(val*, val*))(var12->class->vft[COLOR_kernel__Object___61d_61d]))(var12, var_old_child) /* == on <var12:AExpr>*/;
 if (var13){
@@ -7660,21 +7882,24 @@ var16 = 0;
 var16 = var_new_child->type->type_table[cltype17] == idtype18;
 }
 if (!var16) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10172);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9848);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ADebugTypeExpr___n_expr].val = var_new_child; /* _n_expr on <self:ADebugTypeExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 10175);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9851);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 var19 = self->attrs[COLOR_parser_nodes__ADebugTypeExpr___n_type].val; /* _n_type on <self:ADebugTypeExpr> */
 if (var19 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_type", "src/parser/parser_prod.nit", 10179);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_type");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9855);
+show_backtrace(1);
 }
 var20 = ((short int (*)(val*, val*))(var19->class->vft[COLOR_kernel__Object___61d_61d]))(var19, var_old_child) /* == on <var19:AType>*/;
 if (var20){
@@ -7695,13 +7920,15 @@ var23 = 0;
 var23 = var_new_child->type->type_table[cltype24] == idtype25;
 }
 if (!var23) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10182);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9858);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ADebugTypeExpr___n_type].val = var_new_child; /* _n_type on <self:ADebugTypeExpr> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 10185);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9861);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -7775,26 +8002,30 @@ val* var3 /* : AType */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__ADebugTypeExpr___n_kwdebug].val; /* _n_kwdebug on <self:ADebugTypeExpr> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_kwdebug", "src/parser/parser_prod.nit", 10215);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwdebug");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9891);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 var1 = self->attrs[COLOR_parser_nodes__ADebugTypeExpr___n_kwtype].val; /* _n_kwtype on <self:ADebugTypeExpr> */
 if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_kwtype", "src/parser/parser_prod.nit", 10216);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwtype");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9892);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var1) /* enter_visit on <var_v:Visitor>*/;
 var2 = self->attrs[COLOR_parser_nodes__ADebugTypeExpr___n_expr].val; /* _n_expr on <self:ADebugTypeExpr> */
 if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_expr", "src/parser/parser_prod.nit", 10217);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_expr");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9893);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var2) /* enter_visit on <var_v:Visitor>*/;
 var3 = self->attrs[COLOR_parser_nodes__ADebugTypeExpr___n_type].val; /* _n_type on <self:ADebugTypeExpr> */
 if (var3 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_type", "src/parser/parser_prod.nit", 10218);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_type");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9894);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var3) /* enter_visit on <var_v:Visitor>*/;
 RET_LABEL:;
@@ -7841,13 +8072,15 @@ var3 = 0;
 var3 = var_n->type->type_table[cltype] == idtype;
 }
 if (!var3) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10230);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9906);
+show_backtrace(1);
 }
 var4 = self->attrs[COLOR_parser_nodes__AExprs___n_exprs].val; /* _n_exprs on <self:AListExprs> */
 if (var4 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 10231);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9907);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var4->class->vft[COLOR_abstract_collection__SimpleCollection__add]))(var4, var_n) /* add on <var4:ANodes[AExpr]>*/;
 ((void (*)(val*, val*))(var_n->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n, self) /* parent= on <var_n:Object(AExpr)>*/;
@@ -7893,14 +8126,14 @@ var = NEW_range__Range(&type_range__Rangekernel__Int);
 var1 = 0;
 var2 = self->attrs[COLOR_parser_nodes__AExprs___n_exprs].val; /* _n_exprs on <self:AListExprs> */
 if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 10238);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9914);
+show_backtrace(1);
 }
 var3 = ((long (*)(val*))(var2->class->vft[COLOR_abstract_collection__Collection__length]))(var2) /* length on <var2:ANodes[AExpr]>*/;
 var4 = BOX_kernel__Int(var1); /* autobox from Int to Discrete */
 var5 = BOX_kernel__Int(var3); /* autobox from Int to Discrete */
 ((void (*)(val*, val*, val*))(var->class->vft[COLOR_range__Range__without_last]))(var, var4, var5) /* without_last on <var:Range[Int]>*/;
-CHECK_NEW_range__Range(var);
 var6 = ((val* (*)(val*))(var->class->vft[COLOR_abstract_collection__Collection__iterator]))(var) /* iterator on <var:Range[Int]>*/;
 for(;;) {
 var7 = ((short int (*)(val*))(var6->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(var6) /* is_ok on <var6:Iterator[nullable Object]>*/;
@@ -7910,8 +8143,9 @@ var9 = ((struct instance_kernel__Int*)var8)->value; /* autounbox from nullable O
 var_i = var9;
 var10 = self->attrs[COLOR_parser_nodes__AExprs___n_exprs].val; /* _n_exprs on <self:AListExprs> */
 if (var10 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 10239);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9915);
+show_backtrace(1);
 }
 var11 = ((val* (*)(val*, long))(var10->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(var10, var_i) /* [] on <var10:ANodes[AExpr]>*/;
 var12 = ((short int (*)(val*, val*))(var11->class->vft[COLOR_kernel__Object___61d_61d]))(var11, var_old_child) /* == on <var11:nullable Object(AExpr)>*/;
@@ -7932,21 +8166,24 @@ var15 = 0;
 var15 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var15) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10241);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9917);
+show_backtrace(1);
 }
 var16 = self->attrs[COLOR_parser_nodes__AExprs___n_exprs].val; /* _n_exprs on <self:AListExprs> */
 if (var16 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 10242);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9918);
+show_backtrace(1);
 }
 ((void (*)(val*, long, val*))(var16->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(var16, var_i, var_new_child) /* []= on <var16:ANodes[AExpr]>*/;
 ((void (*)(val*, val*))(var_new_child->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_new_child, self) /* parent= on <var_new_child:nullable ANode(AExpr)>*/;
 } else {
 var17 = self->attrs[COLOR_parser_nodes__AExprs___n_exprs].val; /* _n_exprs on <self:AListExprs> */
 if (var17 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 10245);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9921);
+show_backtrace(1);
 }
 ((void (*)(val*, long))(var17->class->vft[COLOR_abstract_collection__Sequence__remove_at]))(var17, var_i) /* remove_at on <var17:ANodes[AExpr]>*/;
 }
@@ -7975,8 +8212,9 @@ val* var_n /* var n: AExpr */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__AExprs___n_exprs].val; /* _n_exprs on <self:AListExprs> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 10256);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9932);
+show_backtrace(1);
 }
 var1 = ((val* (*)(val*))(var->class->vft[COLOR_abstract_collection__Collection__iterator]))(var) /* iterator on <var:ANodes[AExpr]>*/;
 for(;;) {
@@ -8023,13 +8261,15 @@ var_n_exprs = p1;
 var_n_cpar = p2;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__AParExprs__empty_init]))(self) /* empty_init on <self:AParExprs>*/;
 if (var_n_opar == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 10271);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9947);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AParExprs___n_opar].val = var_n_opar; /* _n_opar on <self:AParExprs> */
 if (var_n_opar == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 10272);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9948);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_opar->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_opar, self) /* parent= on <var_n_opar:nullable TOpar>*/;
 }
@@ -8048,13 +8288,15 @@ var3 = 0;
 var3 = var_n->type->type_table[cltype] == idtype;
 }
 if (!var3) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10274);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9950);
+show_backtrace(1);
 }
 var4 = self->attrs[COLOR_parser_nodes__AExprs___n_exprs].val; /* _n_exprs on <self:AParExprs> */
 if (var4 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 10275);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9951);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var4->class->vft[COLOR_abstract_collection__SimpleCollection__add]))(var4, var_n) /* add on <var4:ANodes[AExpr]>*/;
 ((void (*)(val*, val*))(var_n->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n, self) /* parent= on <var_n:Object(AExpr)>*/;
@@ -8063,13 +8305,15 @@ CONTINUE_label: (void)0;
 }
 BREAK_label: (void)0;
 if (var_n_cpar == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 10278);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9954);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AParExprs___n_cpar].val = var_n_cpar; /* _n_cpar on <self:AParExprs> */
 if (var_n_cpar == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 10279);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9955);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_cpar->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_cpar, self) /* parent= on <var_n_cpar:nullable TCpar>*/;
 }
@@ -8123,8 +8367,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__AParExprs___n_opar].val; /* _n_opar on <self:AParExprs> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_opar", "src/parser/parser_prod.nit", 10284);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_opar");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9960);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:TOpar>*/;
 if (var1){
@@ -8145,13 +8390,15 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10287);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9963);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AParExprs___n_opar].val = var_new_child; /* _n_opar on <self:AParExprs> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 10290);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9966);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -8160,14 +8407,14 @@ var5 = NEW_range__Range(&type_range__Rangekernel__Int);
 var6 = 0;
 var7 = self->attrs[COLOR_parser_nodes__AExprs___n_exprs].val; /* _n_exprs on <self:AParExprs> */
 if (var7 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 10294);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9970);
+show_backtrace(1);
 }
 var8 = ((long (*)(val*))(var7->class->vft[COLOR_abstract_collection__Collection__length]))(var7) /* length on <var7:ANodes[AExpr]>*/;
 var9 = BOX_kernel__Int(var6); /* autobox from Int to Discrete */
 var10 = BOX_kernel__Int(var8); /* autobox from Int to Discrete */
 ((void (*)(val*, val*, val*))(var5->class->vft[COLOR_range__Range__without_last]))(var5, var9, var10) /* without_last on <var5:Range[Int]>*/;
-CHECK_NEW_range__Range(var5);
 var11 = ((val* (*)(val*))(var5->class->vft[COLOR_abstract_collection__Collection__iterator]))(var5) /* iterator on <var5:Range[Int]>*/;
 for(;;) {
 var12 = ((short int (*)(val*))(var11->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(var11) /* is_ok on <var11:Iterator[nullable Object]>*/;
@@ -8177,8 +8424,9 @@ var14 = ((struct instance_kernel__Int*)var13)->value; /* autounbox from nullable
 var_i = var14;
 var15 = self->attrs[COLOR_parser_nodes__AExprs___n_exprs].val; /* _n_exprs on <self:AParExprs> */
 if (var15 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 10295);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9971);
+show_backtrace(1);
 }
 var16 = ((val* (*)(val*, long))(var15->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(var15, var_i) /* [] on <var15:ANodes[AExpr]>*/;
 var17 = ((short int (*)(val*, val*))(var16->class->vft[COLOR_kernel__Object___61d_61d]))(var16, var_old_child) /* == on <var16:nullable Object(AExpr)>*/;
@@ -8199,21 +8447,24 @@ var20 = 0;
 var20 = var_new_child->type->type_table[cltype21] == idtype22;
 }
 if (!var20) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10297);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9973);
+show_backtrace(1);
 }
 var23 = self->attrs[COLOR_parser_nodes__AExprs___n_exprs].val; /* _n_exprs on <self:AParExprs> */
 if (var23 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 10298);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9974);
+show_backtrace(1);
 }
 ((void (*)(val*, long, val*))(var23->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(var23, var_i, var_new_child) /* []= on <var23:ANodes[AExpr]>*/;
 ((void (*)(val*, val*))(var_new_child->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_new_child, self) /* parent= on <var_new_child:nullable ANode(AExpr)>*/;
 } else {
 var24 = self->attrs[COLOR_parser_nodes__AExprs___n_exprs].val; /* _n_exprs on <self:AParExprs> */
 if (var24 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 10301);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9977);
+show_backtrace(1);
 }
 ((void (*)(val*, long))(var24->class->vft[COLOR_abstract_collection__Sequence__remove_at]))(var24, var_i) /* remove_at on <var24:ANodes[AExpr]>*/;
 }
@@ -8226,8 +8477,9 @@ CONTINUE_label: (void)0;
 BREAK_label: (void)0;
 var25 = self->attrs[COLOR_parser_nodes__AParExprs___n_cpar].val; /* _n_cpar on <self:AParExprs> */
 if (var25 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_cpar", "src/parser/parser_prod.nit", 10306);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_cpar");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9982);
+show_backtrace(1);
 }
 var26 = ((short int (*)(val*, val*))(var25->class->vft[COLOR_kernel__Object___61d_61d]))(var25, var_old_child) /* == on <var25:TCpar>*/;
 if (var26){
@@ -8248,13 +8500,15 @@ var29 = 0;
 var29 = var_new_child->type->type_table[cltype30] == idtype31;
 }
 if (!var29) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10309);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9985);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AParExprs___n_cpar].val = var_new_child; /* _n_cpar on <self:AParExprs> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 10312);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 9988);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -8305,14 +8559,16 @@ val* var5 /* : TCpar */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__AParExprs___n_opar].val; /* _n_opar on <self:AParExprs> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_opar", "src/parser/parser_prod.nit", 10332);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_opar");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10008);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 var1 = self->attrs[COLOR_parser_nodes__AExprs___n_exprs].val; /* _n_exprs on <self:AParExprs> */
 if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 10333);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10009);
+show_backtrace(1);
 }
 var2 = ((val* (*)(val*))(var1->class->vft[COLOR_abstract_collection__Collection__iterator]))(var1) /* iterator on <var1:ANodes[AExpr]>*/;
 for(;;) {
@@ -8327,8 +8583,9 @@ CONTINUE_label: (void)0;
 BREAK_label: (void)0;
 var5 = self->attrs[COLOR_parser_nodes__AParExprs___n_cpar].val; /* _n_cpar on <self:AParExprs> */
 if (var5 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_cpar", "src/parser/parser_prod.nit", 10336);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_cpar");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10012);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var5) /* enter_visit on <var_v:Visitor>*/;
 RET_LABEL:;
@@ -8365,13 +8622,15 @@ var_n_exprs = p1;
 var_n_cbra = p2;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__ABraExprs__empty_init]))(self) /* empty_init on <self:ABraExprs>*/;
 if (var_n_obra == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 10349);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10025);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ABraExprs___n_obra].val = var_n_obra; /* _n_obra on <self:ABraExprs> */
 if (var_n_obra == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 10350);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10026);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_obra->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_obra, self) /* parent= on <var_n_obra:nullable TObra>*/;
 }
@@ -8390,13 +8649,15 @@ var3 = 0;
 var3 = var_n->type->type_table[cltype] == idtype;
 }
 if (!var3) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10352);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10028);
+show_backtrace(1);
 }
 var4 = self->attrs[COLOR_parser_nodes__AExprs___n_exprs].val; /* _n_exprs on <self:ABraExprs> */
 if (var4 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 10353);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10029);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var4->class->vft[COLOR_abstract_collection__SimpleCollection__add]))(var4, var_n) /* add on <var4:ANodes[AExpr]>*/;
 ((void (*)(val*, val*))(var_n->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n, self) /* parent= on <var_n:Object(AExpr)>*/;
@@ -8405,13 +8666,15 @@ CONTINUE_label: (void)0;
 }
 BREAK_label: (void)0;
 if (var_n_cbra == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 10356);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10032);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ABraExprs___n_cbra].val = var_n_cbra; /* _n_cbra on <self:ABraExprs> */
 if (var_n_cbra == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 10357);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10033);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_cbra->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_cbra, self) /* parent= on <var_n_cbra:nullable TCbra>*/;
 }
@@ -8465,8 +8728,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__ABraExprs___n_obra].val; /* _n_obra on <self:ABraExprs> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_obra", "src/parser/parser_prod.nit", 10362);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_obra");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10038);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:TObra>*/;
 if (var1){
@@ -8487,13 +8751,15 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10365);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10041);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ABraExprs___n_obra].val = var_new_child; /* _n_obra on <self:ABraExprs> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 10368);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10044);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -8502,14 +8768,14 @@ var5 = NEW_range__Range(&type_range__Rangekernel__Int);
 var6 = 0;
 var7 = self->attrs[COLOR_parser_nodes__AExprs___n_exprs].val; /* _n_exprs on <self:ABraExprs> */
 if (var7 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 10372);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10048);
+show_backtrace(1);
 }
 var8 = ((long (*)(val*))(var7->class->vft[COLOR_abstract_collection__Collection__length]))(var7) /* length on <var7:ANodes[AExpr]>*/;
 var9 = BOX_kernel__Int(var6); /* autobox from Int to Discrete */
 var10 = BOX_kernel__Int(var8); /* autobox from Int to Discrete */
 ((void (*)(val*, val*, val*))(var5->class->vft[COLOR_range__Range__without_last]))(var5, var9, var10) /* without_last on <var5:Range[Int]>*/;
-CHECK_NEW_range__Range(var5);
 var11 = ((val* (*)(val*))(var5->class->vft[COLOR_abstract_collection__Collection__iterator]))(var5) /* iterator on <var5:Range[Int]>*/;
 for(;;) {
 var12 = ((short int (*)(val*))(var11->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(var11) /* is_ok on <var11:Iterator[nullable Object]>*/;
@@ -8519,8 +8785,9 @@ var14 = ((struct instance_kernel__Int*)var13)->value; /* autounbox from nullable
 var_i = var14;
 var15 = self->attrs[COLOR_parser_nodes__AExprs___n_exprs].val; /* _n_exprs on <self:ABraExprs> */
 if (var15 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 10373);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10049);
+show_backtrace(1);
 }
 var16 = ((val* (*)(val*, long))(var15->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(var15, var_i) /* [] on <var15:ANodes[AExpr]>*/;
 var17 = ((short int (*)(val*, val*))(var16->class->vft[COLOR_kernel__Object___61d_61d]))(var16, var_old_child) /* == on <var16:nullable Object(AExpr)>*/;
@@ -8541,21 +8808,24 @@ var20 = 0;
 var20 = var_new_child->type->type_table[cltype21] == idtype22;
 }
 if (!var20) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10375);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10051);
+show_backtrace(1);
 }
 var23 = self->attrs[COLOR_parser_nodes__AExprs___n_exprs].val; /* _n_exprs on <self:ABraExprs> */
 if (var23 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 10376);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10052);
+show_backtrace(1);
 }
 ((void (*)(val*, long, val*))(var23->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(var23, var_i, var_new_child) /* []= on <var23:ANodes[AExpr]>*/;
 ((void (*)(val*, val*))(var_new_child->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_new_child, self) /* parent= on <var_new_child:nullable ANode(AExpr)>*/;
 } else {
 var24 = self->attrs[COLOR_parser_nodes__AExprs___n_exprs].val; /* _n_exprs on <self:ABraExprs> */
 if (var24 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 10379);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10055);
+show_backtrace(1);
 }
 ((void (*)(val*, long))(var24->class->vft[COLOR_abstract_collection__Sequence__remove_at]))(var24, var_i) /* remove_at on <var24:ANodes[AExpr]>*/;
 }
@@ -8568,8 +8838,9 @@ CONTINUE_label: (void)0;
 BREAK_label: (void)0;
 var25 = self->attrs[COLOR_parser_nodes__ABraExprs___n_cbra].val; /* _n_cbra on <self:ABraExprs> */
 if (var25 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_cbra", "src/parser/parser_prod.nit", 10384);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_cbra");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10060);
+show_backtrace(1);
 }
 var26 = ((short int (*)(val*, val*))(var25->class->vft[COLOR_kernel__Object___61d_61d]))(var25, var_old_child) /* == on <var25:TCbra>*/;
 if (var26){
@@ -8590,13 +8861,15 @@ var29 = 0;
 var29 = var_new_child->type->type_table[cltype30] == idtype31;
 }
 if (!var29) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10387);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10063);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__ABraExprs___n_cbra].val = var_new_child; /* _n_cbra on <self:ABraExprs> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 10390);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10066);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -8647,14 +8920,16 @@ val* var5 /* : TCbra */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__ABraExprs___n_obra].val; /* _n_obra on <self:ABraExprs> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_obra", "src/parser/parser_prod.nit", 10410);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_obra");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10086);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 var1 = self->attrs[COLOR_parser_nodes__AExprs___n_exprs].val; /* _n_exprs on <self:ABraExprs> */
 if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_exprs", "src/parser/parser_prod.nit", 10411);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_exprs");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10087);
+show_backtrace(1);
 }
 var2 = ((val* (*)(val*))(var1->class->vft[COLOR_abstract_collection__Collection__iterator]))(var1) /* iterator on <var1:ANodes[AExpr]>*/;
 for(;;) {
@@ -8669,8 +8944,9 @@ CONTINUE_label: (void)0;
 BREAK_label: (void)0;
 var5 = self->attrs[COLOR_parser_nodes__ABraExprs___n_cbra].val; /* _n_cbra on <self:ABraExprs> */
 if (var5 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_cbra", "src/parser/parser_prod.nit", 10414);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_cbra");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10090);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var5) /* enter_visit on <var_v:Visitor>*/;
 RET_LABEL:;
@@ -8695,13 +8971,15 @@ val* var_n_pluseq /* var n_pluseq: nullable TPluseq */;
 var_n_pluseq = p0;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__APlusAssignOp__empty_init]))(self) /* empty_init on <self:APlusAssignOp>*/;
 if (var_n_pluseq == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 10425);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10101);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__APlusAssignOp___n_pluseq].val = var_n_pluseq; /* _n_pluseq on <self:APlusAssignOp> */
 if (var_n_pluseq == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 10426);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10102);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_pluseq->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_pluseq, self) /* parent= on <var_n_pluseq:nullable TPluseq>*/;
 }
@@ -8727,8 +9005,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__APlusAssignOp___n_pluseq].val; /* _n_pluseq on <self:APlusAssignOp> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_pluseq", "src/parser/parser_prod.nit", 10431);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_pluseq");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10107);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:TPluseq>*/;
 if (var1){
@@ -8749,13 +9028,15 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10434);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10110);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__APlusAssignOp___n_pluseq].val = var_new_child; /* _n_pluseq on <self:APlusAssignOp> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 10437);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10113);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -8787,8 +9068,9 @@ val* var /* : TPluseq */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__APlusAssignOp___n_pluseq].val; /* _n_pluseq on <self:APlusAssignOp> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_pluseq", "src/parser/parser_prod.nit", 10452);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_pluseq");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10128);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 RET_LABEL:;
@@ -8813,13 +9095,15 @@ val* var_n_minuseq /* var n_minuseq: nullable TMinuseq */;
 var_n_minuseq = p0;
 ((void (*)(val*))(self->class->vft[COLOR_parser_prod__AMinusAssignOp__empty_init]))(self) /* empty_init on <self:AMinusAssignOp>*/;
 if (var_n_minuseq == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 10463);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10139);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AMinusAssignOp___n_minuseq].val = var_n_minuseq; /* _n_minuseq on <self:AMinusAssignOp> */
 if (var_n_minuseq == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 10464);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10140);
+show_backtrace(1);
 } else {
 ((void (*)(val*, val*))(var_n_minuseq->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_minuseq, self) /* parent= on <var_n_minuseq:nullable TMinuseq>*/;
 }
@@ -8845,8 +9129,9 @@ var_old_child = p0;
 var_new_child = p1;
 var = self->attrs[COLOR_parser_nodes__AMinusAssignOp___n_minuseq].val; /* _n_minuseq on <self:AMinusAssignOp> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_minuseq", "src/parser/parser_prod.nit", 10469);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_minuseq");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10145);
+show_backtrace(1);
 }
 var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:TMinuseq>*/;
 if (var1){
@@ -8867,13 +9152,15 @@ var4 = 0;
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10472);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10148);
+show_backtrace(1);
 }
 self->attrs[COLOR_parser_nodes__AMinusAssignOp___n_minuseq].val = var_new_child; /* _n_minuseq on <self:AMinusAssignOp> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 10475);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10151);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
@@ -8905,8 +9192,9 @@ val* var /* : TMinuseq */;
 var_v = p0;
 var = self->attrs[COLOR_parser_nodes__AMinusAssignOp___n_minuseq].val; /* _n_minuseq on <self:AMinusAssignOp> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_minuseq", "src/parser/parser_prod.nit", 10490);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_minuseq");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10166);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
 RET_LABEL:;
@@ -8916,206 +9204,144 @@ void VIRTUAL_parser_prod__AMinusAssignOp__visit_all(val* self, val* p0) {
 parser_prod__AMinusAssignOp__visit_all(self, p0);
 RET_LABEL:;
 }
-/* method parser_prod#AClosureDef#empty_init for (self: AClosureDef) */
-void parser_prod__AClosureDef__empty_init(val* self) {
+/* method parser_prod#AModuleName#empty_init for (self: AModuleName) */
+void parser_prod__AModuleName__empty_init(val* self) {
 RET_LABEL:;
 }
-/* method parser_prod#AClosureDef#empty_init for (self: Object) */
-void VIRTUAL_parser_prod__AClosureDef__empty_init(val* self) {
-parser_prod__AClosureDef__empty_init(self);
+/* method parser_prod#AModuleName#empty_init for (self: Object) */
+void VIRTUAL_parser_prod__AModuleName__empty_init(val* self) {
+parser_prod__AModuleName__empty_init(self);
 RET_LABEL:;
 }
-/* method parser_prod#AClosureDef#init_aclosuredef for (self: AClosureDef, nullable TBang, nullable AClosureId, Collection[Object], nullable TKwdo, nullable AExpr, nullable ALabel) */
-void parser_prod__AClosureDef__init_aclosuredef(val* self, val* p0, val* p1, val* p2, val* p3, val* p4, val* p5) {
-val* var_n_bang /* var n_bang: nullable TBang */;
-val* var_n_id /* var n_id: nullable AClosureId */;
-val* var_n_ids /* var n_ids: Collection[Object] */;
-val* var_n_kwdo /* var n_kwdo: nullable TKwdo */;
-val* var_n_expr /* var n_expr: nullable AExpr */;
-val* var_n_label /* var n_label: nullable ALabel */;
-val* var /* : Iterator[nullable Object] */;
+/* method parser_prod#AModuleName#init_amodulename for (self: AModuleName, nullable TQuad, Collection[Object], nullable TId) */
+void parser_prod__AModuleName__init_amodulename(val* self, val* p0, val* p1, val* p2) {
+val* var_n_quad /* var n_quad: nullable TQuad */;
+val* var_n_path /* var n_path: Collection[Object] */;
+val* var_n_id /* var n_id: nullable TId */;
+val* var /* : null */;
 short int var1 /* : Bool */;
-val* var2 /* : nullable Object */;
-val* var_n /* var n: Object */;
+val* var2 /* : Iterator[nullable Object] */;
 short int var3 /* : Bool */;
+val* var4 /* : nullable Object */;
+val* var_n /* var n: Object */;
+short int var5 /* : Bool */;
 int cltype;
 int idtype;
-val* var4 /* : ANodes[TId] */;
-val* var5 /* : null */;
-short int var6 /* : Bool */;
-val* var7 /* : null */;
-short int var8 /* : Bool */;
-val* var9 /* : null */;
-short int var10 /* : Bool */;
-var_n_bang = p0;
-var_n_id = p1;
-var_n_ids = p2;
-var_n_kwdo = p3;
-var_n_expr = p4;
-var_n_label = p5;
-((void (*)(val*))(self->class->vft[COLOR_parser_prod__AClosureDef__empty_init]))(self) /* empty_init on <self:AClosureDef>*/;
-if (var_n_bang == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 10506);
-exit(1);
-}
-self->attrs[COLOR_parser_nodes__AClosureDef___n_bang].val = var_n_bang; /* _n_bang on <self:AClosureDef> */
-if (var_n_bang == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 10507);
-exit(1);
-} else {
-((void (*)(val*, val*))(var_n_bang->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_bang, self) /* parent= on <var_n_bang:nullable TBang>*/;
-}
-if (var_n_id == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 10508);
-exit(1);
+val* var6 /* : ANodes[TId] */;
+var_n_quad = p0;
+var_n_path = p1;
+var_n_id = p2;
+((void (*)(val*))(self->class->vft[COLOR_parser_prod__AModuleName__empty_init]))(self) /* empty_init on <self:AModuleName>*/;
+self->attrs[COLOR_parser_nodes__AModuleName___n_quad].val = var_n_quad; /* _n_quad on <self:AModuleName> */
+var = NULL;
+if (var_n_quad == NULL) {
+var1 = 0; /* is null */
+} else {
+var1 = 1; /* arg is null and recv is not */
 }
-self->attrs[COLOR_parser_nodes__AClosureDef___n_id].val = var_n_id; /* _n_id on <self:AClosureDef> */
-if (var_n_id == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 10509);
-exit(1);
+if (var1){
+((void (*)(val*, val*))(var_n_quad->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_quad, self) /* parent= on <var_n_quad:nullable TQuad(TQuad)>*/;
 } else {
-((void (*)(val*, val*))(var_n_id->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_id, self) /* parent= on <var_n_id:nullable AClosureId>*/;
 }
-var = ((val* (*)(val*))(var_n_ids->class->vft[COLOR_abstract_collection__Collection__iterator]))(var_n_ids) /* iterator on <var_n_ids:Collection[Object]>*/;
+var2 = ((val* (*)(val*))(var_n_path->class->vft[COLOR_abstract_collection__Collection__iterator]))(var_n_path) /* iterator on <var_n_path:Collection[Object]>*/;
 for(;;) {
-var1 = ((short int (*)(val*))(var->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(var) /* is_ok on <var:Iterator[nullable Object]>*/;
-if(!var1) break;
-var2 = ((val* (*)(val*))(var->class->vft[COLOR_abstract_collection__Iterator__item]))(var) /* item on <var:Iterator[nullable Object]>*/;
-var_n = var2;
+var3 = ((short int (*)(val*))(var2->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(var2) /* is_ok on <var2:Iterator[nullable Object]>*/;
+if(!var3) break;
+var4 = ((val* (*)(val*))(var2->class->vft[COLOR_abstract_collection__Iterator__item]))(var2) /* item on <var2:Iterator[nullable Object]>*/;
+var_n = var4;
 /* <var_n:Object> isa TId */
 cltype = type_parser_nodes__TId.color;
 idtype = type_parser_nodes__TId.id;
 if(cltype >= var_n->type->table_size) {
-var3 = 0;
+var5 = 0;
 } else {
-var3 = var_n->type->type_table[cltype] == idtype;
+var5 = var_n->type->type_table[cltype] == idtype;
 }
-if (!var3) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10511);
-exit(1);
+if (!var5) {
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10184);
+show_backtrace(1);
 }
-var4 = self->attrs[COLOR_parser_nodes__AClosureDef___n_ids].val; /* _n_ids on <self:AClosureDef> */
-if (var4 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_ids", "src/parser/parser_prod.nit", 10512);
-exit(1);
+var6 = self->attrs[COLOR_parser_nodes__AModuleName___n_path].val; /* _n_path on <self:AModuleName> */
+if (var6 == NULL) {
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_path");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10185);
+show_backtrace(1);
 }
-((void (*)(val*, val*))(var4->class->vft[COLOR_abstract_collection__SimpleCollection__add]))(var4, var_n) /* add on <var4:ANodes[TId]>*/;
+((void (*)(val*, val*))(var6->class->vft[COLOR_abstract_collection__SimpleCollection__add]))(var6, var_n) /* add on <var6:ANodes[TId]>*/;
 ((void (*)(val*, val*))(var_n->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n, self) /* parent= on <var_n:Object(TId)>*/;
 CONTINUE_label: (void)0;
-((void (*)(val*))(var->class->vft[COLOR_abstract_collection__Iterator__next]))(var) /* next on <var:Iterator[nullable Object]>*/;
+((void (*)(val*))(var2->class->vft[COLOR_abstract_collection__Iterator__next]))(var2) /* next on <var2:Iterator[nullable Object]>*/;
 }
 BREAK_label: (void)0;
-self->attrs[COLOR_parser_nodes__AClosureDef___n_kwdo].val = var_n_kwdo; /* _n_kwdo on <self:AClosureDef> */
-var5 = NULL;
-if (var_n_kwdo == NULL) {
-var6 = 0; /* is null */
-} else {
-var6 = 1; /* arg is null and recv is not */
+if (var_n_id == NULL) {
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10188);
+show_backtrace(1);
 }
-if (var6){
-((void (*)(val*, val*))(var_n_kwdo->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_kwdo, self) /* parent= on <var_n_kwdo:nullable TKwdo(TKwdo)>*/;
-} else {
-}
-self->attrs[COLOR_parser_nodes__AClosureDef___n_expr].val = var_n_expr; /* _n_expr on <self:AClosureDef> */
-var7 = NULL;
-if (var_n_expr == NULL) {
-var8 = 0; /* is null */
-} else {
-var8 = 1; /* arg is null and recv is not */
-}
-if (var8){
-((void (*)(val*, val*))(var_n_expr->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_expr, self) /* parent= on <var_n_expr:nullable AExpr(AExpr)>*/;
-} else {
-}
-self->attrs[COLOR_parser_nodes__ALabelable___n_label].val = var_n_label; /* _n_label on <self:AClosureDef> */
-var9 = NULL;
-if (var_n_label == NULL) {
-var10 = 0; /* is null */
-} else {
-var10 = 1; /* arg is null and recv is not */
-}
-if (var10){
-((void (*)(val*, val*))(var_n_label->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_label, self) /* parent= on <var_n_label:nullable ALabel(ALabel)>*/;
+self->attrs[COLOR_parser_nodes__AModuleName___n_id].val = var_n_id; /* _n_id on <self:AModuleName> */
+if (var_n_id == NULL) {
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10189);
+show_backtrace(1);
 } else {
+((void (*)(val*, val*))(var_n_id->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_id, self) /* parent= on <var_n_id:nullable TId>*/;
 }
 RET_LABEL:;
 }
-/* method parser_prod#AClosureDef#init_aclosuredef for (self: Object, nullable TBang, nullable AClosureId, Collection[Object], nullable TKwdo, nullable AExpr, nullable ALabel) */
-void VIRTUAL_parser_prod__AClosureDef__init_aclosuredef(val* self, val* p0, val* p1, val* p2, val* p3, val* p4, val* p5) {
-parser_prod__AClosureDef__init_aclosuredef(self, p0, p1, p2, p3, p4, p5);
+/* method parser_prod#AModuleName#init_amodulename for (self: Object, nullable TQuad, Collection[Object], nullable TId) */
+void VIRTUAL_parser_prod__AModuleName__init_amodulename(val* self, val* p0, val* p1, val* p2) {
+parser_prod__AModuleName__init_amodulename(self, p0, p1, p2);
 RET_LABEL:;
 }
-/* method parser_prod#AClosureDef#replace_child for (self: AClosureDef, ANode, nullable ANode) */
-void parser_prod__AClosureDef__replace_child(val* self, val* p0, val* p1) {
+/* method parser_prod#AModuleName#replace_child for (self: AModuleName, ANode, nullable ANode) */
+void parser_prod__AModuleName__replace_child(val* self, val* p0, val* p1) {
 val* var_old_child /* var old_child: ANode */;
 val* var_new_child /* var new_child: nullable ANode */;
-val* var /* : TBang */;
+val* var /* : nullable TQuad */;
 short int var1 /* : Bool */;
 val* var2 /* : null */;
 short int var3 /* : Bool */;
 short int var4 /* : Bool */;
 int cltype;
 int idtype;
-val* var5 /* : AClosureId */;
-short int var6 /* : Bool */;
-val* var7 /* : null */;
-short int var8 /* : Bool */;
-short int var9 /* : Bool */;
-int cltype10;
-int idtype11;
-val* var12 /* : Range[Int] */;
-long var13 /* : Int */;
-val* var14 /* : ANodes[TId] */;
-long var15 /* : Int */;
-val* var16 /* : Discrete */;
-val* var17 /* : Discrete */;
-val* var18 /* : Iterator[nullable Object] */;
-short int var19 /* : Bool */;
-val* var20 /* : nullable Object */;
+val* var5 /* : null */;
+val* var6 /* : Range[Int] */;
+long var7 /* : Int */;
+val* var8 /* : ANodes[TId] */;
+long var9 /* : Int */;
+val* var10 /* : Discrete */;
+val* var11 /* : Discrete */;
+val* var12 /* : Iterator[nullable Object] */;
+short int var13 /* : Bool */;
+val* var14 /* : nullable Object */;
 long var_i /* var i: Int */;
-long var21 /* : Int */;
-val* var22 /* : ANodes[TId] */;
-val* var23 /* : nullable Object */;
-short int var24 /* : Bool */;
-val* var25 /* : null */;
-short int var26 /* : Bool */;
+long var15 /* : Int */;
+val* var16 /* : ANodes[TId] */;
+val* var17 /* : nullable Object */;
+short int var18 /* : Bool */;
+val* var19 /* : null */;
+short int var20 /* : Bool */;
+short int var21 /* : Bool */;
+int cltype22;
+int idtype23;
+val* var24 /* : ANodes[TId] */;
+val* var25 /* : ANodes[TId] */;
+val* var26 /* : TId */;
 short int var27 /* : Bool */;
-int cltype28;
-int idtype29;
-val* var30 /* : ANodes[TId] */;
-val* var31 /* : ANodes[TId] */;
-val* var32 /* : nullable TKwdo */;
-short int var33 /* : Bool */;
-val* var34 /* : null */;
-short int var35 /* : Bool */;
-short int var36 /* : Bool */;
-int cltype37;
-int idtype38;
-val* var39 /* : null */;
-val* var40 /* : nullable AExpr */;
-short int var41 /* : Bool */;
-val* var42 /* : null */;
-short int var43 /* : Bool */;
-short int var44 /* : Bool */;
-int cltype45;
-int idtype46;
-val* var47 /* : null */;
-val* var48 /* : nullable ALabel */;
-short int var49 /* : Bool */;
-val* var50 /* : null */;
-short int var51 /* : Bool */;
-short int var52 /* : Bool */;
-int cltype53;
-int idtype54;
-val* var55 /* : null */;
+val* var28 /* : null */;
+short int var29 /* : Bool */;
+short int var30 /* : Bool */;
+int cltype31;
+int idtype32;
 var_old_child = p0;
 var_new_child = p1;
-var = self->attrs[COLOR_parser_nodes__AClosureDef___n_bang].val; /* _n_bang on <self:AClosureDef> */
+var = self->attrs[COLOR_parser_nodes__AModuleName___n_quad].val; /* _n_quad on <self:AModuleName> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_bang", "src/parser/parser_prod.nit", 10531);
-exit(1);
+var1 = 0; /* <var_old_child:ANode> cannot be null */
+} else {
+var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:nullable TQuad>*/;
 }
-var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:TBang>*/;
 if (var1){
 var2 = NULL;
 if (var_new_child == NULL) {
@@ -9125,274 +9351,151 @@ var3 = 1; /* arg is null and recv is not */
 }
 if (var3){
 ((void (*)(val*, val*))(var_new_child->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_new_child, self) /* parent= on <var_new_child:nullable ANode(ANode)>*/;
-/* <var_new_child:nullable ANode(ANode)> isa TBang */
-cltype = type_parser_nodes__TBang.color;
-idtype = type_parser_nodes__TBang.id;
+/* <var_new_child:nullable ANode(ANode)> isa TQuad */
+cltype = type_parser_nodes__TQuad.color;
+idtype = type_parser_nodes__TQuad.id;
 if(cltype >= var_new_child->type->table_size) {
 var4 = 0;
 } else {
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10534);
-exit(1);
-}
-self->attrs[COLOR_parser_nodes__AClosureDef___n_bang].val = var_new_child; /* _n_bang on <self:AClosureDef> */
-} else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 10537);
-exit(1);
-}
-goto RET_LABEL;
-} else {
-}
-var5 = self->attrs[COLOR_parser_nodes__AClosureDef___n_id].val; /* _n_id on <self:AClosureDef> */
-if (var5 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_id", "src/parser/parser_prod.nit", 10541);
-exit(1);
-}
-var6 = ((short int (*)(val*, val*))(var5->class->vft[COLOR_kernel__Object___61d_61d]))(var5, var_old_child) /* == on <var5:AClosureId>*/;
-if (var6){
-var7 = NULL;
-if (var_new_child == NULL) {
-var8 = 0; /* is null */
-} else {
-var8 = 1; /* arg is null and recv is not */
-}
-if (var8){
-((void (*)(val*, val*))(var_new_child->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_new_child, self) /* parent= on <var_new_child:nullable ANode(ANode)>*/;
-/* <var_new_child:nullable ANode(ANode)> isa AClosureId */
-cltype10 = type_parser_nodes__AClosureId.color;
-idtype11 = type_parser_nodes__AClosureId.id;
-if(cltype10 >= var_new_child->type->table_size) {
-var9 = 0;
-} else {
-var9 = var_new_child->type->type_table[cltype10] == idtype11;
-}
-if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10544);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10197);
+show_backtrace(1);
 }
-self->attrs[COLOR_parser_nodes__AClosureDef___n_id].val = var_new_child; /* _n_id on <self:AClosureDef> */
+self->attrs[COLOR_parser_nodes__AModuleName___n_quad].val = var_new_child; /* _n_quad on <self:AModuleName> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 10547);
-exit(1);
+var5 = NULL;
+self->attrs[COLOR_parser_nodes__AModuleName___n_quad].val = var5; /* _n_quad on <self:AModuleName> */
 }
 goto RET_LABEL;
 } else {
 }
-var12 = NEW_range__Range(&type_range__Rangekernel__Int);
-var13 = 0;
-var14 = self->attrs[COLOR_parser_nodes__AClosureDef___n_ids].val; /* _n_ids on <self:AClosureDef> */
-if (var14 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_ids", "src/parser/parser_prod.nit", 10551);
-exit(1);
+var6 = NEW_range__Range(&type_range__Rangekernel__Int);
+var7 = 0;
+var8 = self->attrs[COLOR_parser_nodes__AModuleName___n_path].val; /* _n_path on <self:AModuleName> */
+if (var8 == NULL) {
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_path");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10204);
+show_backtrace(1);
 }
-var15 = ((long (*)(val*))(var14->class->vft[COLOR_abstract_collection__Collection__length]))(var14) /* length on <var14:ANodes[TId]>*/;
-var16 = BOX_kernel__Int(var13); /* autobox from Int to Discrete */
-var17 = BOX_kernel__Int(var15); /* autobox from Int to Discrete */
-((void (*)(val*, val*, val*))(var12->class->vft[COLOR_range__Range__without_last]))(var12, var16, var17) /* without_last on <var12:Range[Int]>*/;
-CHECK_NEW_range__Range(var12);
-var18 = ((val* (*)(val*))(var12->class->vft[COLOR_abstract_collection__Collection__iterator]))(var12) /* iterator on <var12:Range[Int]>*/;
+var9 = ((long (*)(val*))(var8->class->vft[COLOR_abstract_collection__Collection__length]))(var8) /* length on <var8:ANodes[TId]>*/;
+var10 = BOX_kernel__Int(var7); /* autobox from Int to Discrete */
+var11 = BOX_kernel__Int(var9); /* autobox from Int to Discrete */
+((void (*)(val*, val*, val*))(var6->class->vft[COLOR_range__Range__without_last]))(var6, var10, var11) /* without_last on <var6:Range[Int]>*/;
+var12 = ((val* (*)(val*))(var6->class->vft[COLOR_abstract_collection__Collection__iterator]))(var6) /* iterator on <var6:Range[Int]>*/;
 for(;;) {
-var19 = ((short int (*)(val*))(var18->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(var18) /* is_ok on <var18:Iterator[nullable Object]>*/;
-if(!var19) break;
-var20 = ((val* (*)(val*))(var18->class->vft[COLOR_abstract_collection__Iterator__item]))(var18) /* item on <var18:Iterator[nullable Object]>*/;
-var21 = ((struct instance_kernel__Int*)var20)->value; /* autounbox from nullable Object to Int */;
-var_i = var21;
-var22 = self->attrs[COLOR_parser_nodes__AClosureDef___n_ids].val; /* _n_ids on <self:AClosureDef> */
-if (var22 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_ids", "src/parser/parser_prod.nit", 10552);
-exit(1);
-}
-var23 = ((val* (*)(val*, long))(var22->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(var22, var_i) /* [] on <var22:ANodes[TId]>*/;
-var24 = ((short int (*)(val*, val*))(var23->class->vft[COLOR_kernel__Object___61d_61d]))(var23, var_old_child) /* == on <var23:nullable Object(TId)>*/;
-if (var24){
-var25 = NULL;
+var13 = ((short int (*)(val*))(var12->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(var12) /* is_ok on <var12:Iterator[nullable Object]>*/;
+if(!var13) break;
+var14 = ((val* (*)(val*))(var12->class->vft[COLOR_abstract_collection__Iterator__item]))(var12) /* item on <var12:Iterator[nullable Object]>*/;
+var15 = ((struct instance_kernel__Int*)var14)->value; /* autounbox from nullable Object to Int */;
+var_i = var15;
+var16 = self->attrs[COLOR_parser_nodes__AModuleName___n_path].val; /* _n_path on <self:AModuleName> */
+if (var16 == NULL) {
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_path");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10205);
+show_backtrace(1);
+}
+var17 = ((val* (*)(val*, long))(var16->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(var16, var_i) /* [] on <var16:ANodes[TId]>*/;
+var18 = ((short int (*)(val*, val*))(var17->class->vft[COLOR_kernel__Object___61d_61d]))(var17, var_old_child) /* == on <var17:nullable Object(TId)>*/;
+if (var18){
+var19 = NULL;
 if (var_new_child == NULL) {
-var26 = 0; /* is null */
+var20 = 0; /* is null */
 } else {
-var26 = 1; /* arg is null and recv is not */
+var20 = 1; /* arg is null and recv is not */
 }
-if (var26){
+if (var20){
 /* <var_new_child:nullable ANode(ANode)> isa TId */
-cltype28 = type_parser_nodes__TId.color;
-idtype29 = type_parser_nodes__TId.id;
-if(cltype28 >= var_new_child->type->table_size) {
-var27 = 0;
+cltype22 = type_parser_nodes__TId.color;
+idtype23 = type_parser_nodes__TId.id;
+if(cltype22 >= var_new_child->type->table_size) {
+var21 = 0;
 } else {
-var27 = var_new_child->type->type_table[cltype28] == idtype29;
+var21 = var_new_child->type->type_table[cltype22] == idtype23;
 }
-if (!var27) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10554);
-exit(1);
+if (!var21) {
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10207);
+show_backtrace(1);
 }
-var30 = self->attrs[COLOR_parser_nodes__AClosureDef___n_ids].val; /* _n_ids on <self:AClosureDef> */
-if (var30 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_ids", "src/parser/parser_prod.nit", 10555);
-exit(1);
+var24 = self->attrs[COLOR_parser_nodes__AModuleName___n_path].val; /* _n_path on <self:AModuleName> */
+if (var24 == NULL) {
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_path");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10208);
+show_backtrace(1);
 }
-((void (*)(val*, long, val*))(var30->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(var30, var_i, var_new_child) /* []= on <var30:ANodes[TId]>*/;
+((void (*)(val*, long, val*))(var24->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(var24, var_i, var_new_child) /* []= on <var24:ANodes[TId]>*/;
 ((void (*)(val*, val*))(var_new_child->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_new_child, self) /* parent= on <var_new_child:nullable ANode(TId)>*/;
 } else {
-var31 = self->attrs[COLOR_parser_nodes__AClosureDef___n_ids].val; /* _n_ids on <self:AClosureDef> */
-if (var31 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_ids", "src/parser/parser_prod.nit", 10558);
-exit(1);
+var25 = self->attrs[COLOR_parser_nodes__AModuleName___n_path].val; /* _n_path on <self:AModuleName> */
+if (var25 == NULL) {
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_path");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10211);
+show_backtrace(1);
 }
-((void (*)(val*, long))(var31->class->vft[COLOR_abstract_collection__Sequence__remove_at]))(var31, var_i) /* remove_at on <var31:ANodes[TId]>*/;
+((void (*)(val*, long))(var25->class->vft[COLOR_abstract_collection__Sequence__remove_at]))(var25, var_i) /* remove_at on <var25:ANodes[TId]>*/;
 }
 goto RET_LABEL;
 } else {
 }
 CONTINUE_label: (void)0;
-((void (*)(val*))(var18->class->vft[COLOR_abstract_collection__Iterator__next]))(var18) /* next on <var18:Iterator[nullable Object]>*/;
+((void (*)(val*))(var12->class->vft[COLOR_abstract_collection__Iterator__next]))(var12) /* next on <var12:Iterator[nullable Object]>*/;
 }
 BREAK_label: (void)0;
-var32 = self->attrs[COLOR_parser_nodes__AClosureDef___n_kwdo].val; /* _n_kwdo on <self:AClosureDef> */
-if (var32 == NULL) {
-var33 = 0; /* <var_old_child:ANode> cannot be null */
-} else {
-var33 = ((short int (*)(val*, val*))(var32->class->vft[COLOR_kernel__Object___61d_61d]))(var32, var_old_child) /* == on <var32:nullable TKwdo>*/;
-}
-if (var33){
-var34 = NULL;
-if (var_new_child == NULL) {
-var35 = 0; /* is null */
-} else {
-var35 = 1; /* arg is null and recv is not */
-}
-if (var35){
-((void (*)(val*, val*))(var_new_child->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_new_child, self) /* parent= on <var_new_child:nullable ANode(ANode)>*/;
-/* <var_new_child:nullable ANode(ANode)> isa TKwdo */
-cltype37 = type_parser_nodes__TKwdo.color;
-idtype38 = type_parser_nodes__TKwdo.id;
-if(cltype37 >= var_new_child->type->table_size) {
-var36 = 0;
-} else {
-var36 = var_new_child->type->type_table[cltype37] == idtype38;
-}
-if (!var36) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10566);
-exit(1);
-}
-self->attrs[COLOR_parser_nodes__AClosureDef___n_kwdo].val = var_new_child; /* _n_kwdo on <self:AClosureDef> */
-} else {
-var39 = NULL;
-self->attrs[COLOR_parser_nodes__AClosureDef___n_kwdo].val = var39; /* _n_kwdo on <self:AClosureDef> */
-}
-goto RET_LABEL;
-} else {
-}
-var40 = self->attrs[COLOR_parser_nodes__AClosureDef___n_expr].val; /* _n_expr on <self:AClosureDef> */
-if (var40 == NULL) {
-var41 = 0; /* <var_old_child:ANode> cannot be null */
-} else {
-var41 = ((short int (*)(val*, val*))(var40->class->vft[COLOR_kernel__Object___61d_61d]))(var40, var_old_child) /* == on <var40:nullable AExpr>*/;
-}
-if (var41){
-var42 = NULL;
-if (var_new_child == NULL) {
-var43 = 0; /* is null */
-} else {
-var43 = 1; /* arg is null and recv is not */
-}
-if (var43){
-((void (*)(val*, val*))(var_new_child->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_new_child, self) /* parent= on <var_new_child:nullable ANode(ANode)>*/;
-/* <var_new_child:nullable ANode(ANode)> isa AExpr */
-cltype45 = type_parser_nodes__AExpr.color;
-idtype46 = type_parser_nodes__AExpr.id;
-if(cltype45 >= var_new_child->type->table_size) {
-var44 = 0;
-} else {
-var44 = var_new_child->type->type_table[cltype45] == idtype46;
-}
-if (!var44) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10576);
-exit(1);
-}
-self->attrs[COLOR_parser_nodes__AClosureDef___n_expr].val = var_new_child; /* _n_expr on <self:AClosureDef> */
-} else {
-var47 = NULL;
-self->attrs[COLOR_parser_nodes__AClosureDef___n_expr].val = var47; /* _n_expr on <self:AClosureDef> */
-}
-goto RET_LABEL;
-} else {
-}
-var48 = self->attrs[COLOR_parser_nodes__ALabelable___n_label].val; /* _n_label on <self:AClosureDef> */
-if (var48 == NULL) {
-var49 = 0; /* <var_old_child:ANode> cannot be null */
-} else {
-var49 = ((short int (*)(val*, val*))(var48->class->vft[COLOR_kernel__Object___61d_61d]))(var48, var_old_child) /* == on <var48:nullable ALabel>*/;
+var26 = self->attrs[COLOR_parser_nodes__AModuleName___n_id].val; /* _n_id on <self:AModuleName> */
+if (var26 == NULL) {
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_id");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10216);
+show_backtrace(1);
 }
-if (var49){
-var50 = NULL;
+var27 = ((short int (*)(val*, val*))(var26->class->vft[COLOR_kernel__Object___61d_61d]))(var26, var_old_child) /* == on <var26:TId>*/;
+if (var27){
+var28 = NULL;
 if (var_new_child == NULL) {
-var51 = 0; /* is null */
+var29 = 0; /* is null */
 } else {
-var51 = 1; /* arg is null and recv is not */
+var29 = 1; /* arg is null and recv is not */
 }
-if (var51){
+if (var29){
 ((void (*)(val*, val*))(var_new_child->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_new_child, self) /* parent= on <var_new_child:nullable ANode(ANode)>*/;
-/* <var_new_child:nullable ANode(ANode)> isa ALabel */
-cltype53 = type_parser_nodes__ALabel.color;
-idtype54 = type_parser_nodes__ALabel.id;
-if(cltype53 >= var_new_child->type->table_size) {
-var52 = 0;
+/* <var_new_child:nullable ANode(ANode)> isa TId */
+cltype31 = type_parser_nodes__TId.color;
+idtype32 = type_parser_nodes__TId.id;
+if(cltype31 >= var_new_child->type->table_size) {
+var30 = 0;
 } else {
-var52 = var_new_child->type->type_table[cltype53] == idtype54;
+var30 = var_new_child->type->type_table[cltype31] == idtype32;
 }
-if (!var52) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10586);
-exit(1);
+if (!var30) {
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10219);
+show_backtrace(1);
 }
-self->attrs[COLOR_parser_nodes__ALabelable___n_label].val = var_new_child; /* _n_label on <self:AClosureDef> */
+self->attrs[COLOR_parser_nodes__AModuleName___n_id].val = var_new_child; /* _n_id on <self:AModuleName> */
 } else {
-var55 = NULL;
-self->attrs[COLOR_parser_nodes__ALabelable___n_label].val = var55; /* _n_label on <self:AClosureDef> */
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10222);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 RET_LABEL:;
 }
-/* method parser_prod#AClosureDef#replace_child for (self: Object, ANode, nullable ANode) */
-void VIRTUAL_parser_prod__AClosureDef__replace_child(val* self, val* p0, val* p1) {
-parser_prod__AClosureDef__replace_child(self, p0, p1);
-RET_LABEL:;
-}
-/* method parser_prod#AClosureDef#n_bang= for (self: AClosureDef, TBang) */
-void parser_prod__AClosureDef__n_bang_61d(val* self, val* p0) {
-val* var_node /* var node: TBang */;
-var_node = p0;
-self->attrs[COLOR_parser_nodes__AClosureDef___n_bang].val = var_node; /* _n_bang on <self:AClosureDef> */
-((void (*)(val*, val*))(var_node->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_node, self) /* parent= on <var_node:TBang>*/;
+/* method parser_prod#AModuleName#replace_child for (self: Object, ANode, nullable ANode) */
+void VIRTUAL_parser_prod__AModuleName__replace_child(val* self, val* p0, val* p1) {
+parser_prod__AModuleName__replace_child(self, p0, p1);
 RET_LABEL:;
 }
-/* method parser_prod#AClosureDef#n_bang= for (self: Object, TBang) */
-void VIRTUAL_parser_prod__AClosureDef__n_bang_61d(val* self, val* p0) {
-parser_prod__AClosureDef__n_bang_61d(self, p0);
-RET_LABEL:;
-}
-/* method parser_prod#AClosureDef#n_id= for (self: AClosureDef, AClosureId) */
-void parser_prod__AClosureDef__n_id_61d(val* self, val* p0) {
-val* var_node /* var node: AClosureId */;
-var_node = p0;
-self->attrs[COLOR_parser_nodes__AClosureDef___n_id].val = var_node; /* _n_id on <self:AClosureDef> */
-((void (*)(val*, val*))(var_node->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_node, self) /* parent= on <var_node:AClosureId>*/;
-RET_LABEL:;
-}
-/* method parser_prod#AClosureDef#n_id= for (self: Object, AClosureId) */
-void VIRTUAL_parser_prod__AClosureDef__n_id_61d(val* self, val* p0) {
-parser_prod__AClosureDef__n_id_61d(self, p0);
-RET_LABEL:;
-}
-/* method parser_prod#AClosureDef#n_kwdo= for (self: AClosureDef, nullable TKwdo) */
-void parser_prod__AClosureDef__n_kwdo_61d(val* self, val* p0) {
-val* var_node /* var node: nullable TKwdo */;
+/* method parser_prod#AModuleName#n_quad= for (self: AModuleName, nullable TQuad) */
+void parser_prod__AModuleName__n_quad_61d(val* self, val* p0) {
+val* var_node /* var node: nullable TQuad */;
 val* var /* : null */;
 short int var1 /* : Bool */;
 var_node = p0;
-self->attrs[COLOR_parser_nodes__AClosureDef___n_kwdo].val = var_node; /* _n_kwdo on <self:AClosureDef> */
+self->attrs[COLOR_parser_nodes__AModuleName___n_quad].val = var_node; /* _n_quad on <self:AModuleName> */
 var = NULL;
 if (var_node == NULL) {
 var1 = 0; /* is null */
@@ -9400,221 +9503,207 @@ var1 = 0; /* is null */
 var1 = 1; /* arg is null and recv is not */
 }
 if (var1){
-((void (*)(val*, val*))(var_node->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_node, self) /* parent= on <var_node:nullable TKwdo(TKwdo)>*/;
+((void (*)(val*, val*))(var_node->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_node, self) /* parent= on <var_node:nullable TQuad(TQuad)>*/;
 } else {
 }
 RET_LABEL:;
 }
-/* method parser_prod#AClosureDef#n_kwdo= for (self: Object, nullable TKwdo) */
-void VIRTUAL_parser_prod__AClosureDef__n_kwdo_61d(val* self, val* p0) {
-parser_prod__AClosureDef__n_kwdo_61d(self, p0);
+/* method parser_prod#AModuleName#n_quad= for (self: Object, nullable TQuad) */
+void VIRTUAL_parser_prod__AModuleName__n_quad_61d(val* self, val* p0) {
+parser_prod__AModuleName__n_quad_61d(self, p0);
 RET_LABEL:;
 }
-/* method parser_prod#AClosureDef#n_expr= for (self: AClosureDef, nullable AExpr) */
-void parser_prod__AClosureDef__n_expr_61d(val* self, val* p0) {
-val* var_node /* var node: nullable AExpr */;
-val* var /* : null */;
-short int var1 /* : Bool */;
-var_node = p0;
-self->attrs[COLOR_parser_nodes__AClosureDef___n_expr].val = var_node; /* _n_expr on <self:AClosureDef> */
-var = NULL;
-if (var_node == NULL) {
-var1 = 0; /* is null */
-} else {
-var1 = 1; /* arg is null and recv is not */
-}
-if (var1){
-((void (*)(val*, val*))(var_node->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_node, self) /* parent= on <var_node:nullable AExpr(AExpr)>*/;
-} else {
-}
-RET_LABEL:;
-}
-/* method parser_prod#AClosureDef#n_expr= for (self: Object, nullable AExpr) */
-void VIRTUAL_parser_prod__AClosureDef__n_expr_61d(val* self, val* p0) {
-parser_prod__AClosureDef__n_expr_61d(self, p0);
-RET_LABEL:;
-}
-/* method parser_prod#AClosureDef#n_label= for (self: AClosureDef, nullable ALabel) */
-void parser_prod__AClosureDef__n_label_61d(val* self, val* p0) {
-val* var_node /* var node: nullable ALabel */;
-val* var /* : null */;
-short int var1 /* : Bool */;
+/* method parser_prod#AModuleName#n_id= for (self: AModuleName, TId) */
+void parser_prod__AModuleName__n_id_61d(val* self, val* p0) {
+val* var_node /* var node: TId */;
 var_node = p0;
-self->attrs[COLOR_parser_nodes__ALabelable___n_label].val = var_node; /* _n_label on <self:AClosureDef> */
-var = NULL;
-if (var_node == NULL) {
-var1 = 0; /* is null */
-} else {
-var1 = 1; /* arg is null and recv is not */
-}
-if (var1){
-((void (*)(val*, val*))(var_node->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_node, self) /* parent= on <var_node:nullable ALabel(ALabel)>*/;
-} else {
-}
+self->attrs[COLOR_parser_nodes__AModuleName___n_id].val = var_node; /* _n_id on <self:AModuleName> */
+((void (*)(val*, val*))(var_node->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_node, self) /* parent= on <var_node:TId>*/;
 RET_LABEL:;
 }
-/* method parser_prod#AClosureDef#n_label= for (self: Object, nullable ALabel) */
-void VIRTUAL_parser_prod__AClosureDef__n_label_61d(val* self, val* p0) {
-parser_prod__AClosureDef__n_label_61d(self, p0);
+/* method parser_prod#AModuleName#n_id= for (self: Object, TId) */
+void VIRTUAL_parser_prod__AModuleName__n_id_61d(val* self, val* p0) {
+parser_prod__AModuleName__n_id_61d(self, p0);
 RET_LABEL:;
 }
-/* method parser_prod#AClosureDef#visit_all for (self: AClosureDef, Visitor) */
-void parser_prod__AClosureDef__visit_all(val* self, val* p0) {
+/* method parser_prod#AModuleName#visit_all for (self: AModuleName, Visitor) */
+void parser_prod__AModuleName__visit_all(val* self, val* p0) {
 val* var_v /* var v: Visitor */;
-val* var /* : TBang */;
-val* var1 /* : AClosureId */;
-val* var2 /* : ANodes[TId] */;
-val* var3 /* : Iterator[nullable Object] */;
-short int var4 /* : Bool */;
-val* var5 /* : nullable Object */;
+val* var /* : nullable TQuad */;
+val* var1 /* : null */;
+short int var2 /* : Bool */;
+val* var3 /* : nullable TQuad */;
+val* var4 /* : ANodes[TId] */;
+val* var5 /* : Iterator[nullable Object] */;
+short int var6 /* : Bool */;
+val* var7 /* : nullable Object */;
 val* var_n /* var n: TId */;
-val* var6 /* : nullable TKwdo */;
-val* var7 /* : null */;
-short int var8 /* : Bool */;
-val* var9 /* : nullable TKwdo */;
-val* var10 /* : nullable AExpr */;
-val* var11 /* : null */;
-short int var12 /* : Bool */;
-val* var13 /* : nullable AExpr */;
-val* var14 /* : nullable ALabel */;
-val* var15 /* : null */;
-short int var16 /* : Bool */;
-val* var17 /* : nullable ALabel */;
+val* var8 /* : TId */;
 var_v = p0;
-var = self->attrs[COLOR_parser_nodes__AClosureDef___n_bang].val; /* _n_bang on <self:AClosureDef> */
+var = self->attrs[COLOR_parser_nodes__AModuleName___n_quad].val; /* _n_quad on <self:AModuleName> */
+var1 = NULL;
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_bang", "src/parser/parser_prod.nit", 10630);
-exit(1);
+var2 = 0; /* is null */
+} else {
+var2 = 1; /* arg is null and recv is not */
 }
-((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
-var1 = self->attrs[COLOR_parser_nodes__AClosureDef___n_id].val; /* _n_id on <self:AClosureDef> */
-if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_id", "src/parser/parser_prod.nit", 10631);
-exit(1);
+if (var2){
+var3 = self->attrs[COLOR_parser_nodes__AModuleName___n_quad].val; /* _n_quad on <self:AModuleName> */
+if (var3 == NULL) {
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10245);
+show_backtrace(1);
 }
-((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var1) /* enter_visit on <var_v:Visitor>*/;
-var2 = self->attrs[COLOR_parser_nodes__AClosureDef___n_ids].val; /* _n_ids on <self:AClosureDef> */
-if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_ids", "src/parser/parser_prod.nit", 10632);
-exit(1);
+((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var3) /* enter_visit on <var_v:Visitor>*/;
+} else {
 }
-var3 = ((val* (*)(val*))(var2->class->vft[COLOR_abstract_collection__Collection__iterator]))(var2) /* iterator on <var2:ANodes[TId]>*/;
+var4 = self->attrs[COLOR_parser_nodes__AModuleName___n_path].val; /* _n_path on <self:AModuleName> */
+if (var4 == NULL) {
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_path");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10247);
+show_backtrace(1);
+}
+var5 = ((val* (*)(val*))(var4->class->vft[COLOR_abstract_collection__Collection__iterator]))(var4) /* iterator on <var4:ANodes[TId]>*/;
 for(;;) {
-var4 = ((short int (*)(val*))(var3->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(var3) /* is_ok on <var3:Iterator[nullable Object]>*/;
-if(!var4) break;
-var5 = ((val* (*)(val*))(var3->class->vft[COLOR_abstract_collection__Iterator__item]))(var3) /* item on <var3:Iterator[nullable Object]>*/;
-var_n = var5;
+var6 = ((short int (*)(val*))(var5->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(var5) /* is_ok on <var5:Iterator[nullable Object]>*/;
+if(!var6) break;
+var7 = ((val* (*)(val*))(var5->class->vft[COLOR_abstract_collection__Iterator__item]))(var5) /* item on <var5:Iterator[nullable Object]>*/;
+var_n = var7;
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var_n) /* enter_visit on <var_v:Visitor>*/;
 CONTINUE_label: (void)0;
-((void (*)(val*))(var3->class->vft[COLOR_abstract_collection__Iterator__next]))(var3) /* next on <var3:Iterator[nullable Object]>*/;
+((void (*)(val*))(var5->class->vft[COLOR_abstract_collection__Iterator__next]))(var5) /* next on <var5:Iterator[nullable Object]>*/;
 }
 BREAK_label: (void)0;
-var6 = self->attrs[COLOR_parser_nodes__AClosureDef___n_kwdo].val; /* _n_kwdo on <self:AClosureDef> */
-var7 = NULL;
-if (var6 == NULL) {
-var8 = 0; /* is null */
-} else {
-var8 = 1; /* arg is null and recv is not */
-}
-if (var8){
-var9 = self->attrs[COLOR_parser_nodes__AClosureDef___n_kwdo].val; /* _n_kwdo on <self:AClosureDef> */
-if (var9 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 10636);
-exit(1);
-}
-((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var9) /* enter_visit on <var_v:Visitor>*/;
-} else {
-}
-var10 = self->attrs[COLOR_parser_nodes__AClosureDef___n_expr].val; /* _n_expr on <self:AClosureDef> */
-var11 = NULL;
-if (var10 == NULL) {
-var12 = 0; /* is null */
-} else {
-var12 = 1; /* arg is null and recv is not */
-}
-if (var12){
-var13 = self->attrs[COLOR_parser_nodes__AClosureDef___n_expr].val; /* _n_expr on <self:AClosureDef> */
-if (var13 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 10639);
-exit(1);
-}
-((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var13) /* enter_visit on <var_v:Visitor>*/;
-} else {
-}
-var14 = self->attrs[COLOR_parser_nodes__ALabelable___n_label].val; /* _n_label on <self:AClosureDef> */
-var15 = NULL;
-if (var14 == NULL) {
-var16 = 0; /* is null */
-} else {
-var16 = 1; /* arg is null and recv is not */
-}
-if (var16){
-var17 = self->attrs[COLOR_parser_nodes__ALabelable___n_label].val; /* _n_label on <self:AClosureDef> */
-if (var17 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 10642);
-exit(1);
-}
-((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var17) /* enter_visit on <var_v:Visitor>*/;
-} else {
+var8 = self->attrs[COLOR_parser_nodes__AModuleName___n_id].val; /* _n_id on <self:AModuleName> */
+if (var8 == NULL) {
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_id");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10250);
+show_backtrace(1);
 }
+((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var8) /* enter_visit on <var_v:Visitor>*/;
 RET_LABEL:;
 }
-/* method parser_prod#AClosureDef#visit_all for (self: Object, Visitor) */
-void VIRTUAL_parser_prod__AClosureDef__visit_all(val* self, val* p0) {
-parser_prod__AClosureDef__visit_all(self, p0);
+/* method parser_prod#AModuleName#visit_all for (self: Object, Visitor) */
+void VIRTUAL_parser_prod__AModuleName__visit_all(val* self, val* p0) {
+parser_prod__AModuleName__visit_all(self, p0);
 RET_LABEL:;
 }
-/* method parser_prod#ASimpleClosureId#empty_init for (self: ASimpleClosureId) */
-void parser_prod__ASimpleClosureId__empty_init(val* self) {
+/* method parser_prod#AExternCalls#empty_init for (self: AExternCalls) */
+void parser_prod__AExternCalls__empty_init(val* self) {
 RET_LABEL:;
 }
-/* method parser_prod#ASimpleClosureId#empty_init for (self: Object) */
-void VIRTUAL_parser_prod__ASimpleClosureId__empty_init(val* self) {
-parser_prod__ASimpleClosureId__empty_init(self);
+/* method parser_prod#AExternCalls#empty_init for (self: Object) */
+void VIRTUAL_parser_prod__AExternCalls__empty_init(val* self) {
+parser_prod__AExternCalls__empty_init(self);
 RET_LABEL:;
 }
-/* method parser_prod#ASimpleClosureId#init_asimpleclosureid for (self: ASimpleClosureId, nullable TId) */
-void parser_prod__ASimpleClosureId__init_asimpleclosureid(val* self, val* p0) {
-val* var_n_id /* var n_id: nullable TId */;
-var_n_id = p0;
-((void (*)(val*))(self->class->vft[COLOR_parser_prod__ASimpleClosureId__empty_init]))(self) /* empty_init on <self:ASimpleClosureId>*/;
-if (var_n_id == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 10654);
-exit(1);
-}
-self->attrs[COLOR_parser_nodes__ASimpleClosureId___n_id].val = var_n_id; /* _n_id on <self:ASimpleClosureId> */
-if (var_n_id == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 10655);
-exit(1);
+/* method parser_prod#AExternCalls#init_aexterncalls for (self: AExternCalls, nullable TKwimport, Collection[Object]) */
+void parser_prod__AExternCalls__init_aexterncalls(val* self, val* p0, val* p1) {
+val* var_n_kwimport /* var n_kwimport: nullable TKwimport */;
+val* var_n_extern_calls /* var n_extern_calls: Collection[Object] */;
+val* var /* : Iterator[nullable Object] */;
+short int var1 /* : Bool */;
+val* var2 /* : nullable Object */;
+val* var_n /* var n: Object */;
+short int var3 /* : Bool */;
+int cltype;
+int idtype;
+val* var4 /* : ANodes[AExternCall] */;
+var_n_kwimport = p0;
+var_n_extern_calls = p1;
+((void (*)(val*))(self->class->vft[COLOR_parser_prod__AExternCalls__empty_init]))(self) /* empty_init on <self:AExternCalls>*/;
+if (var_n_kwimport == NULL) {
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10262);
+show_backtrace(1);
+}
+self->attrs[COLOR_parser_nodes__AExternCalls___n_kwimport].val = var_n_kwimport; /* _n_kwimport on <self:AExternCalls> */
+if (var_n_kwimport == NULL) {
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10263);
+show_backtrace(1);
+} else {
+((void (*)(val*, val*))(var_n_kwimport->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_kwimport, self) /* parent= on <var_n_kwimport:nullable TKwimport>*/;
+}
+var = ((val* (*)(val*))(var_n_extern_calls->class->vft[COLOR_abstract_collection__Collection__iterator]))(var_n_extern_calls) /* iterator on <var_n_extern_calls:Collection[Object]>*/;
+for(;;) {
+var1 = ((short int (*)(val*))(var->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(var) /* is_ok on <var:Iterator[nullable Object]>*/;
+if(!var1) break;
+var2 = ((val* (*)(val*))(var->class->vft[COLOR_abstract_collection__Iterator__item]))(var) /* item on <var:Iterator[nullable Object]>*/;
+var_n = var2;
+/* <var_n:Object> isa AExternCall */
+cltype = type_parser_nodes__AExternCall.color;
+idtype = type_parser_nodes__AExternCall.id;
+if(cltype >= var_n->type->table_size) {
+var3 = 0;
 } else {
-((void (*)(val*, val*))(var_n_id->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_id, self) /* parent= on <var_n_id:nullable TId>*/;
+var3 = var_n->type->type_table[cltype] == idtype;
+}
+if (!var3) {
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10265);
+show_backtrace(1);
+}
+var4 = self->attrs[COLOR_parser_nodes__AExternCalls___n_extern_calls].val; /* _n_extern_calls on <self:AExternCalls> */
+if (var4 == NULL) {
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_extern_calls");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10266);
+show_backtrace(1);
 }
+((void (*)(val*, val*))(var4->class->vft[COLOR_abstract_collection__SimpleCollection__add]))(var4, var_n) /* add on <var4:ANodes[AExternCall]>*/;
+((void (*)(val*, val*))(var_n->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n, self) /* parent= on <var_n:Object(AExternCall)>*/;
+CONTINUE_label: (void)0;
+((void (*)(val*))(var->class->vft[COLOR_abstract_collection__Iterator__next]))(var) /* next on <var:Iterator[nullable Object]>*/;
+}
+BREAK_label: (void)0;
 RET_LABEL:;
 }
-/* method parser_prod#ASimpleClosureId#init_asimpleclosureid for (self: Object, nullable TId) */
-void VIRTUAL_parser_prod__ASimpleClosureId__init_asimpleclosureid(val* self, val* p0) {
-parser_prod__ASimpleClosureId__init_asimpleclosureid(self, p0);
+/* method parser_prod#AExternCalls#init_aexterncalls for (self: Object, nullable TKwimport, Collection[Object]) */
+void VIRTUAL_parser_prod__AExternCalls__init_aexterncalls(val* self, val* p0, val* p1) {
+parser_prod__AExternCalls__init_aexterncalls(self, p0, p1);
 RET_LABEL:;
 }
-/* method parser_prod#ASimpleClosureId#replace_child for (self: ASimpleClosureId, ANode, nullable ANode) */
-void parser_prod__ASimpleClosureId__replace_child(val* self, val* p0, val* p1) {
+/* method parser_prod#AExternCalls#replace_child for (self: AExternCalls, ANode, nullable ANode) */
+void parser_prod__AExternCalls__replace_child(val* self, val* p0, val* p1) {
 val* var_old_child /* var old_child: ANode */;
 val* var_new_child /* var new_child: nullable ANode */;
-val* var /* : TId */;
+val* var /* : TKwimport */;
 short int var1 /* : Bool */;
 val* var2 /* : null */;
 short int var3 /* : Bool */;
 short int var4 /* : Bool */;
 int cltype;
 int idtype;
+val* var5 /* : Range[Int] */;
+long var6 /* : Int */;
+val* var7 /* : ANodes[AExternCall] */;
+long var8 /* : Int */;
+val* var9 /* : Discrete */;
+val* var10 /* : Discrete */;
+val* var11 /* : Iterator[nullable Object] */;
+short int var12 /* : Bool */;
+val* var13 /* : nullable Object */;
+long var_i /* var i: Int */;
+long var14 /* : Int */;
+val* var15 /* : ANodes[AExternCall] */;
+val* var16 /* : nullable Object */;
+short int var17 /* : Bool */;
+val* var18 /* : null */;
+short int var19 /* : Bool */;
+short int var20 /* : Bool */;
+int cltype21;
+int idtype22;
+val* var23 /* : ANodes[AExternCall] */;
+val* var24 /* : ANodes[AExternCall] */;
 var_old_child = p0;
 var_new_child = p1;
-var = self->attrs[COLOR_parser_nodes__ASimpleClosureId___n_id].val; /* _n_id on <self:ASimpleClosureId> */
+var = self->attrs[COLOR_parser_nodes__AExternCalls___n_kwimport].val; /* _n_kwimport on <self:AExternCalls> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_id", "src/parser/parser_prod.nit", 10660);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwimport");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10273);
+show_backtrace(1);
 }
-var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:TId>*/;
+var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:TKwimport>*/;
 if (var1){
 var2 = NULL;
 if (var_new_child == NULL) {
@@ -9624,101 +9713,243 @@ var3 = 1; /* arg is null and recv is not */
 }
 if (var3){
 ((void (*)(val*, val*))(var_new_child->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_new_child, self) /* parent= on <var_new_child:nullable ANode(ANode)>*/;
-/* <var_new_child:nullable ANode(ANode)> isa TId */
-cltype = type_parser_nodes__TId.color;
-idtype = type_parser_nodes__TId.id;
+/* <var_new_child:nullable ANode(ANode)> isa TKwimport */
+cltype = type_parser_nodes__TKwimport.color;
+idtype = type_parser_nodes__TKwimport.id;
 if(cltype >= var_new_child->type->table_size) {
 var4 = 0;
 } else {
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10663);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10276);
+show_backtrace(1);
+}
+self->attrs[COLOR_parser_nodes__AExternCalls___n_kwimport].val = var_new_child; /* _n_kwimport on <self:AExternCalls> */
+} else {
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10279);
+show_backtrace(1);
+}
+goto RET_LABEL;
+} else {
+}
+var5 = NEW_range__Range(&type_range__Rangekernel__Int);
+var6 = 0;
+var7 = self->attrs[COLOR_parser_nodes__AExternCalls___n_extern_calls].val; /* _n_extern_calls on <self:AExternCalls> */
+if (var7 == NULL) {
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_extern_calls");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10283);
+show_backtrace(1);
+}
+var8 = ((long (*)(val*))(var7->class->vft[COLOR_abstract_collection__Collection__length]))(var7) /* length on <var7:ANodes[AExternCall]>*/;
+var9 = BOX_kernel__Int(var6); /* autobox from Int to Discrete */
+var10 = BOX_kernel__Int(var8); /* autobox from Int to Discrete */
+((void (*)(val*, val*, val*))(var5->class->vft[COLOR_range__Range__without_last]))(var5, var9, var10) /* without_last on <var5:Range[Int]>*/;
+var11 = ((val* (*)(val*))(var5->class->vft[COLOR_abstract_collection__Collection__iterator]))(var5) /* iterator on <var5:Range[Int]>*/;
+for(;;) {
+var12 = ((short int (*)(val*))(var11->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(var11) /* is_ok on <var11:Iterator[nullable Object]>*/;
+if(!var12) break;
+var13 = ((val* (*)(val*))(var11->class->vft[COLOR_abstract_collection__Iterator__item]))(var11) /* item on <var11:Iterator[nullable Object]>*/;
+var14 = ((struct instance_kernel__Int*)var13)->value; /* autounbox from nullable Object to Int */;
+var_i = var14;
+var15 = self->attrs[COLOR_parser_nodes__AExternCalls___n_extern_calls].val; /* _n_extern_calls on <self:AExternCalls> */
+if (var15 == NULL) {
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_extern_calls");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10284);
+show_backtrace(1);
+}
+var16 = ((val* (*)(val*, long))(var15->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(var15, var_i) /* [] on <var15:ANodes[AExternCall]>*/;
+var17 = ((short int (*)(val*, val*))(var16->class->vft[COLOR_kernel__Object___61d_61d]))(var16, var_old_child) /* == on <var16:nullable Object(AExternCall)>*/;
+if (var17){
+var18 = NULL;
+if (var_new_child == NULL) {
+var19 = 0; /* is null */
+} else {
+var19 = 1; /* arg is null and recv is not */
 }
-self->attrs[COLOR_parser_nodes__ASimpleClosureId___n_id].val = var_new_child; /* _n_id on <self:ASimpleClosureId> */
+if (var19){
+/* <var_new_child:nullable ANode(ANode)> isa AExternCall */
+cltype21 = type_parser_nodes__AExternCall.color;
+idtype22 = type_parser_nodes__AExternCall.id;
+if(cltype21 >= var_new_child->type->table_size) {
+var20 = 0;
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 10666);
-exit(1);
+var20 = var_new_child->type->type_table[cltype21] == idtype22;
+}
+if (!var20) {
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10286);
+show_backtrace(1);
+}
+var23 = self->attrs[COLOR_parser_nodes__AExternCalls___n_extern_calls].val; /* _n_extern_calls on <self:AExternCalls> */
+if (var23 == NULL) {
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_extern_calls");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10287);
+show_backtrace(1);
+}
+((void (*)(val*, long, val*))(var23->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(var23, var_i, var_new_child) /* []= on <var23:ANodes[AExternCall]>*/;
+((void (*)(val*, val*))(var_new_child->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_new_child, self) /* parent= on <var_new_child:nullable ANode(AExternCall)>*/;
+} else {
+var24 = self->attrs[COLOR_parser_nodes__AExternCalls___n_extern_calls].val; /* _n_extern_calls on <self:AExternCalls> */
+if (var24 == NULL) {
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_extern_calls");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10290);
+show_backtrace(1);
+}
+((void (*)(val*, long))(var24->class->vft[COLOR_abstract_collection__Sequence__remove_at]))(var24, var_i) /* remove_at on <var24:ANodes[AExternCall]>*/;
 }
 goto RET_LABEL;
 } else {
 }
+CONTINUE_label: (void)0;
+((void (*)(val*))(var11->class->vft[COLOR_abstract_collection__Iterator__next]))(var11) /* next on <var11:Iterator[nullable Object]>*/;
+}
+BREAK_label: (void)0;
 RET_LABEL:;
 }
-/* method parser_prod#ASimpleClosureId#replace_child for (self: Object, ANode, nullable ANode) */
-void VIRTUAL_parser_prod__ASimpleClosureId__replace_child(val* self, val* p0, val* p1) {
-parser_prod__ASimpleClosureId__replace_child(self, p0, p1);
+/* method parser_prod#AExternCalls#replace_child for (self: Object, ANode, nullable ANode) */
+void VIRTUAL_parser_prod__AExternCalls__replace_child(val* self, val* p0, val* p1) {
+parser_prod__AExternCalls__replace_child(self, p0, p1);
 RET_LABEL:;
 }
-/* method parser_prod#ASimpleClosureId#n_id= for (self: ASimpleClosureId, TId) */
-void parser_prod__ASimpleClosureId__n_id_61d(val* self, val* p0) {
-val* var_node /* var node: TId */;
+/* method parser_prod#AExternCalls#n_kwimport= for (self: AExternCalls, TKwimport) */
+void parser_prod__AExternCalls__n_kwimport_61d(val* self, val* p0) {
+val* var_node /* var node: TKwimport */;
 var_node = p0;
-self->attrs[COLOR_parser_nodes__ASimpleClosureId___n_id].val = var_node; /* _n_id on <self:ASimpleClosureId> */
-((void (*)(val*, val*))(var_node->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_node, self) /* parent= on <var_node:TId>*/;
+self->attrs[COLOR_parser_nodes__AExternCalls___n_kwimport].val = var_node; /* _n_kwimport on <self:AExternCalls> */
+((void (*)(val*, val*))(var_node->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_node, self) /* parent= on <var_node:TKwimport>*/;
 RET_LABEL:;
 }
-/* method parser_prod#ASimpleClosureId#n_id= for (self: Object, TId) */
-void VIRTUAL_parser_prod__ASimpleClosureId__n_id_61d(val* self, val* p0) {
-parser_prod__ASimpleClosureId__n_id_61d(self, p0);
+/* method parser_prod#AExternCalls#n_kwimport= for (self: Object, TKwimport) */
+void VIRTUAL_parser_prod__AExternCalls__n_kwimport_61d(val* self, val* p0) {
+parser_prod__AExternCalls__n_kwimport_61d(self, p0);
 RET_LABEL:;
 }
-/* method parser_prod#ASimpleClosureId#visit_all for (self: ASimpleClosureId, Visitor) */
-void parser_prod__ASimpleClosureId__visit_all(val* self, val* p0) {
+/* method parser_prod#AExternCalls#visit_all for (self: AExternCalls, Visitor) */
+void parser_prod__AExternCalls__visit_all(val* self, val* p0) {
 val* var_v /* var v: Visitor */;
-val* var /* : TId */;
+val* var /* : TKwimport */;
+val* var1 /* : ANodes[AExternCall] */;
+val* var2 /* : Iterator[nullable Object] */;
+short int var3 /* : Bool */;
+val* var4 /* : nullable Object */;
+val* var_n /* var n: AExternCall */;
 var_v = p0;
-var = self->attrs[COLOR_parser_nodes__ASimpleClosureId___n_id].val; /* _n_id on <self:ASimpleClosureId> */
+var = self->attrs[COLOR_parser_nodes__AExternCalls___n_kwimport].val; /* _n_kwimport on <self:AExternCalls> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_id", "src/parser/parser_prod.nit", 10681);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwimport");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10306);
+show_backtrace(1);
 }
 ((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
+var1 = self->attrs[COLOR_parser_nodes__AExternCalls___n_extern_calls].val; /* _n_extern_calls on <self:AExternCalls> */
+if (var1 == NULL) {
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_extern_calls");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10307);
+show_backtrace(1);
+}
+var2 = ((val* (*)(val*))(var1->class->vft[COLOR_abstract_collection__Collection__iterator]))(var1) /* iterator on <var1:ANodes[AExternCall]>*/;
+for(;;) {
+var3 = ((short int (*)(val*))(var2->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(var2) /* is_ok on <var2:Iterator[nullable Object]>*/;
+if(!var3) break;
+var4 = ((val* (*)(val*))(var2->class->vft[COLOR_abstract_collection__Iterator__item]))(var2) /* item on <var2:Iterator[nullable Object]>*/;
+var_n = var4;
+((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var_n) /* enter_visit on <var_v:Visitor>*/;
+CONTINUE_label: (void)0;
+((void (*)(val*))(var2->class->vft[COLOR_abstract_collection__Iterator__next]))(var2) /* next on <var2:Iterator[nullable Object]>*/;
+}
+BREAK_label: (void)0;
+RET_LABEL:;
+}
+/* method parser_prod#AExternCalls#visit_all for (self: Object, Visitor) */
+void VIRTUAL_parser_prod__AExternCalls__visit_all(val* self, val* p0) {
+parser_prod__AExternCalls__visit_all(self, p0);
 RET_LABEL:;
 }
-/* method parser_prod#ASimpleClosureId#visit_all for (self: Object, Visitor) */
-void VIRTUAL_parser_prod__ASimpleClosureId__visit_all(val* self, val* p0) {
-parser_prod__ASimpleClosureId__visit_all(self, p0);
+/* method parser_prod#AExternCall#empty_init for (self: AExternCall) */
+void parser_prod__AExternCall__empty_init(val* self) {
 RET_LABEL:;
 }
-/* method parser_prod#ABreakClosureId#empty_init for (self: ABreakClosureId) */
-void parser_prod__ABreakClosureId__empty_init(val* self) {
+/* method parser_prod#AExternCall#empty_init for (self: Object) */
+void VIRTUAL_parser_prod__AExternCall__empty_init(val* self) {
+parser_prod__AExternCall__empty_init(self);
 RET_LABEL:;
 }
-/* method parser_prod#ABreakClosureId#empty_init for (self: Object) */
-void VIRTUAL_parser_prod__ABreakClosureId__empty_init(val* self) {
-parser_prod__ABreakClosureId__empty_init(self);
+/* method parser_prod#AExternCall#init_aexterncall for (self: AExternCall) */
+void parser_prod__AExternCall__init_aexterncall(val* self) {
+((void (*)(val*))(self->class->vft[COLOR_parser_prod__AExternCall__empty_init]))(self) /* empty_init on <self:AExternCall>*/;
 RET_LABEL:;
 }
-/* method parser_prod#ABreakClosureId#init_abreakclosureid for (self: ABreakClosureId, nullable TKwbreak) */
-void parser_prod__ABreakClosureId__init_abreakclosureid(val* self, val* p0) {
-val* var_n_kwbreak /* var n_kwbreak: nullable TKwbreak */;
-var_n_kwbreak = p0;
-((void (*)(val*))(self->class->vft[COLOR_parser_prod__ABreakClosureId__empty_init]))(self) /* empty_init on <self:ABreakClosureId>*/;
-if (var_n_kwbreak == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 10692);
-exit(1);
+/* method parser_prod#AExternCall#init_aexterncall for (self: Object) */
+void VIRTUAL_parser_prod__AExternCall__init_aexterncall(val* self) {
+parser_prod__AExternCall__init_aexterncall(self);
+RET_LABEL:;
+}
+/* method parser_prod#AExternCall#replace_child for (self: AExternCall, ANode, nullable ANode) */
+void parser_prod__AExternCall__replace_child(val* self, val* p0, val* p1) {
+val* var_old_child /* var old_child: ANode */;
+val* var_new_child /* var new_child: nullable ANode */;
+var_old_child = p0;
+var_new_child = p1;
+RET_LABEL:;
+}
+/* method parser_prod#AExternCall#replace_child for (self: Object, ANode, nullable ANode) */
+void VIRTUAL_parser_prod__AExternCall__replace_child(val* self, val* p0, val* p1) {
+parser_prod__AExternCall__replace_child(self, p0, p1);
+RET_LABEL:;
 }
-self->attrs[COLOR_parser_nodes__ABreakClosureId___n_kwbreak].val = var_n_kwbreak; /* _n_kwbreak on <self:ABreakClosureId> */
-if (var_n_kwbreak == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 10693);
-exit(1);
+/* method parser_prod#AExternCall#visit_all for (self: AExternCall, Visitor) */
+void parser_prod__AExternCall__visit_all(val* self, val* p0) {
+val* var_v /* var v: Visitor */;
+var_v = p0;
+RET_LABEL:;
+}
+/* method parser_prod#AExternCall#visit_all for (self: Object, Visitor) */
+void VIRTUAL_parser_prod__AExternCall__visit_all(val* self, val* p0) {
+parser_prod__AExternCall__visit_all(self, p0);
+RET_LABEL:;
+}
+/* method parser_prod#ASuperExternCall#empty_init for (self: ASuperExternCall) */
+void parser_prod__ASuperExternCall__empty_init(val* self) {
+RET_LABEL:;
+}
+/* method parser_prod#ASuperExternCall#empty_init for (self: Object) */
+void VIRTUAL_parser_prod__ASuperExternCall__empty_init(val* self) {
+parser_prod__ASuperExternCall__empty_init(self);
+RET_LABEL:;
+}
+/* method parser_prod#ASuperExternCall#init_asuperexterncall for (self: ASuperExternCall, nullable TKwsuper) */
+void parser_prod__ASuperExternCall__init_asuperexterncall(val* self, val* p0) {
+val* var_n_kwsuper /* var n_kwsuper: nullable TKwsuper */;
+var_n_kwsuper = p0;
+((void (*)(val*))(self->class->vft[COLOR_parser_prod__ASuperExternCall__empty_init]))(self) /* empty_init on <self:ASuperExternCall>*/;
+if (var_n_kwsuper == NULL) {
+fprintf(stderr, "Runtime error: %s", "Cast failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10338);
+show_backtrace(1);
+}
+self->attrs[COLOR_parser_nodes__ASuperExternCall___n_kwsuper].val = var_n_kwsuper; /* _n_kwsuper on <self:ASuperExternCall> */
+if (var_n_kwsuper == NULL) {
+fprintf(stderr, "Runtime error: %s", "Receiver is null");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10339);
+show_backtrace(1);
 } else {
-((void (*)(val*, val*))(var_n_kwbreak->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_kwbreak, self) /* parent= on <var_n_kwbreak:nullable TKwbreak>*/;
+((void (*)(val*, val*))(var_n_kwsuper->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_kwsuper, self) /* parent= on <var_n_kwsuper:nullable TKwsuper>*/;
 }
 RET_LABEL:;
 }
-/* method parser_prod#ABreakClosureId#init_abreakclosureid for (self: Object, nullable TKwbreak) */
-void VIRTUAL_parser_prod__ABreakClosureId__init_abreakclosureid(val* self, val* p0) {
-parser_prod__ABreakClosureId__init_abreakclosureid(self, p0);
+/* method parser_prod#ASuperExternCall#init_asuperexterncall for (self: Object, nullable TKwsuper) */
+void VIRTUAL_parser_prod__ASuperExternCall__init_asuperexterncall(val* self, val* p0) {
+parser_prod__ASuperExternCall__init_asuperexterncall(self, p0);
 RET_LABEL:;
 }
-/* method parser_prod#ABreakClosureId#replace_child for (self: ABreakClosureId, ANode, nullable ANode) */
-void parser_prod__ABreakClosureId__replace_child(val* self, val* p0, val* p1) {
+/* method parser_prod#ASuperExternCall#replace_child for (self: ASuperExternCall, ANode, nullable ANode) */
+void parser_prod__ASuperExternCall__replace_child(val* self, val* p0, val* p1) {
 val* var_old_child /* var old_child: ANode */;
 val* var_new_child /* var new_child: nullable ANode */;
-val* var /* : TKwbreak */;
+val* var /* : TKwsuper */;
 short int var1 /* : Bool */;
 val* var2 /* : null */;
 short int var3 /* : Bool */;
@@ -9727,12 +9958,13 @@ int cltype;
 int idtype;
 var_old_child = p0;
 var_new_child = p1;
-var = self->attrs[COLOR_parser_nodes__ABreakClosureId___n_kwbreak].val; /* _n_kwbreak on <self:ABreakClosureId> */
+var = self->attrs[COLOR_parser_nodes__ASuperExternCall___n_kwsuper].val; /* _n_kwsuper on <self:ASuperExternCall> */
 if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_kwbreak", "src/parser/parser_prod.nit", 10698);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Uninitialized attribute _n_kwsuper");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10344);
+show_backtrace(1);
 }
-var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:TKwbreak>*/;
+var1 = ((short int (*)(val*, val*))(var->class->vft[COLOR_kernel__Object___61d_61d]))(var, var_old_child) /* == on <var:TKwsuper>*/;
 if (var1){
 var2 = NULL;
 if (var_new_child == NULL) {
@@ -9742,147 +9974,27 @@ var3 = 1; /* arg is null and recv is not */
 }
 if (var3){
 ((void (*)(val*, val*))(var_new_child->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_new_child, self) /* parent= on <var_new_child:nullable ANode(ANode)>*/;
-/* <var_new_child:nullable ANode(ANode)> isa TKwbreak */
-cltype = type_parser_nodes__TKwbreak.color;
-idtype = type_parser_nodes__TKwbreak.id;
+/* <var_new_child:nullable ANode(ANode)> isa TKwsuper */
+cltype = type_parser_nodes__TKwsuper.color;
+idtype = type_parser_nodes__TKwsuper.id;
 if(cltype >= var_new_child->type->table_size) {
 var4 = 0;
 } else {
 var4 = var_new_child->type->type_table[cltype] == idtype;
 }
 if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10701);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Assert failed");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10347);
+show_backtrace(1);
 }
-self->attrs[COLOR_parser_nodes__ABreakClosureId___n_kwbreak].val = var_new_child; /* _n_kwbreak on <self:ABreakClosureId> */
+self->attrs[COLOR_parser_nodes__ASuperExternCall___n_kwsuper].val = var_new_child; /* _n_kwsuper on <self:ASuperExternCall> */
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "src/parser/parser_prod.nit", 10704);
-exit(1);
+fprintf(stderr, "Runtime error: %s", "Aborted");
+fprintf(stderr, " (%s:%d)\n", "src/parser/parser_prod.nit", 10350);
+show_backtrace(1);
 }
 goto RET_LABEL;
 } else {
 }
 RET_LABEL:;
 }
-/* method parser_prod#ABreakClosureId#replace_child for (self: Object, ANode, nullable ANode) */
-void VIRTUAL_parser_prod__ABreakClosureId__replace_child(val* self, val* p0, val* p1) {
-parser_prod__ABreakClosureId__replace_child(self, p0, p1);
-RET_LABEL:;
-}
-/* method parser_prod#ABreakClosureId#n_kwbreak= for (self: ABreakClosureId, TKwbreak) */
-void parser_prod__ABreakClosureId__n_kwbreak_61d(val* self, val* p0) {
-val* var_node /* var node: TKwbreak */;
-var_node = p0;
-self->attrs[COLOR_parser_nodes__ABreakClosureId___n_kwbreak].val = var_node; /* _n_kwbreak on <self:ABreakClosureId> */
-((void (*)(val*, val*))(var_node->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_node, self) /* parent= on <var_node:TKwbreak>*/;
-RET_LABEL:;
-}
-/* method parser_prod#ABreakClosureId#n_kwbreak= for (self: Object, TKwbreak) */
-void VIRTUAL_parser_prod__ABreakClosureId__n_kwbreak_61d(val* self, val* p0) {
-parser_prod__ABreakClosureId__n_kwbreak_61d(self, p0);
-RET_LABEL:;
-}
-/* method parser_prod#ABreakClosureId#visit_all for (self: ABreakClosureId, Visitor) */
-void parser_prod__ABreakClosureId__visit_all(val* self, val* p0) {
-val* var_v /* var v: Visitor */;
-val* var /* : TKwbreak */;
-var_v = p0;
-var = self->attrs[COLOR_parser_nodes__ABreakClosureId___n_kwbreak].val; /* _n_kwbreak on <self:ABreakClosureId> */
-if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_kwbreak", "src/parser/parser_prod.nit", 10719);
-exit(1);
-}
-((void (*)(val*, val*))(var_v->class->vft[COLOR_parser_nodes__Visitor__enter_visit]))(var_v, var) /* enter_visit on <var_v:Visitor>*/;
-RET_LABEL:;
-}
-/* method parser_prod#ABreakClosureId#visit_all for (self: Object, Visitor) */
-void VIRTUAL_parser_prod__ABreakClosureId__visit_all(val* self, val* p0) {
-parser_prod__ABreakClosureId__visit_all(self, p0);
-RET_LABEL:;
-}
-/* method parser_prod#AModuleName#empty_init for (self: AModuleName) */
-void parser_prod__AModuleName__empty_init(val* self) {
-RET_LABEL:;
-}
-/* method parser_prod#AModuleName#empty_init for (self: Object) */
-void VIRTUAL_parser_prod__AModuleName__empty_init(val* self) {
-parser_prod__AModuleName__empty_init(self);
-RET_LABEL:;
-}
-/* method parser_prod#AModuleName#init_amodulename for (self: AModuleName, nullable TQuad, Collection[Object], nullable TId) */
-void parser_prod__AModuleName__init_amodulename(val* self, val* p0, val* p1, val* p2) {
-val* var_n_quad /* var n_quad: nullable TQuad */;
-val* var_n_path /* var n_path: Collection[Object] */;
-val* var_n_id /* var n_id: nullable TId */;
-val* var /* : null */;
-short int var1 /* : Bool */;
-val* var2 /* : Iterator[nullable Object] */;
-short int var3 /* : Bool */;
-val* var4 /* : nullable Object */;
-val* var_n /* var n: Object */;
-short int var5 /* : Bool */;
-int cltype;
-int idtype;
-val* var6 /* : ANodes[TId] */;
-var_n_quad = p0;
-var_n_path = p1;
-var_n_id = p2;
-((void (*)(val*))(self->class->vft[COLOR_parser_prod__AModuleName__empty_init]))(self) /* empty_init on <self:AModuleName>*/;
-self->attrs[COLOR_parser_nodes__AModuleName___n_quad].val = var_n_quad; /* _n_quad on <self:AModuleName> */
-var = NULL;
-if (var_n_quad == NULL) {
-var1 = 0; /* is null */
-} else {
-var1 = 1; /* arg is null and recv is not */
-}
-if (var1){
-((void (*)(val*, val*))(var_n_quad->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_quad, self) /* parent= on <var_n_quad:nullable TQuad(TQuad)>*/;
-} else {
-}
-var2 = ((val* (*)(val*))(var_n_path->class->vft[COLOR_abstract_collection__Collection__iterator]))(var_n_path) /* iterator on <var_n_path:Collection[Object]>*/;
-for(;;) {
-var3 = ((short int (*)(val*))(var2->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(var2) /* is_ok on <var2:Iterator[nullable Object]>*/;
-if(!var3) break;
-var4 = ((val* (*)(val*))(var2->class->vft[COLOR_abstract_collection__Iterator__item]))(var2) /* item on <var2:Iterator[nullable Object]>*/;
-var_n = var4;
-/* <var_n:Object> isa TId */
-cltype = type_parser_nodes__TId.color;
-idtype = type_parser_nodes__TId.id;
-if(cltype >= var_n->type->table_size) {
-var5 = 0;
-} else {
-var5 = var_n->type->type_table[cltype] == idtype;
-}
-if (!var5) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "src/parser/parser_prod.nit", 10737);
-exit(1);
-}
-var6 = self->attrs[COLOR_parser_nodes__AModuleName___n_path].val; /* _n_path on <self:AModuleName> */
-if (var6 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _n_path", "src/parser/parser_prod.nit", 10738);
-exit(1);
-}
-((void (*)(val*, val*))(var6->class->vft[COLOR_abstract_collection__SimpleCollection__add]))(var6, var_n) /* add on <var6:ANodes[TId]>*/;
-((void (*)(val*, val*))(var_n->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n, self) /* parent= on <var_n:Object(TId)>*/;
-CONTINUE_label: (void)0;
-((void (*)(val*))(var2->class->vft[COLOR_abstract_collection__Iterator__next]))(var2) /* next on <var2:Iterator[nullable Object]>*/;
-}
-BREAK_label: (void)0;
-if (var_n_id == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "src/parser/parser_prod.nit", 10741);
-exit(1);
-}
-self->attrs[COLOR_parser_nodes__AModuleName___n_id].val = var_n_id; /* _n_id on <self:AModuleName> */
-if (var_n_id == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "src/parser/parser_prod.nit", 10742);
-exit(1);
-} else {
-((void (*)(val*, val*))(var_n_id->class->vft[COLOR_parser_nodes__ANode__parent_61d]))(var_n_id, self) /* parent= on <var_n_id:nullable TId>*/;
-}
-RET_LABEL:;
-}
-/* method parser_prod#AModuleName#init_amodulename for (self: Object, nullable TQuad, Collection[Object], nullable TId) */
-void VIRTUAL_parser_prod__AModuleName__init_amodulename(val* self, val* p0, val* p1, val* p2) {
-parser_prod__AModuleName__init_amodulename(self, p0, p1, p2);
-RET_LABEL:;
-}