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

diff --git a/c_src/array.sep.1.c b/c_src/array.sep.1.c
index 25048d6..6368793 100644
--- a/c_src/array.sep.1.c
+++ b/c_src/array.sep.1.c
@@ -12,7 +12,12 @@ return var;
 long VIRTUAL_array__AbstractArrayRead__length(val* self) {
 long var /* : Int */;
 long var1 /* : Int */;
-var1 = array__AbstractArrayRead__length(self);
+long var3 /* : Int */;
+{ /* Inline array#AbstractArrayRead#length (self) on <self:Object(AbstractArrayRead[nullable Object])> */
+var3 = self->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <self:Object(AbstractArrayRead[nullable Object])> */
+var1 = var3;
+RET_LABEL2:(void)0;
+}
 var = var1;
 RET_LABEL:;
 return var;
@@ -23,14 +28,18 @@ short int var /* : Bool */;
 long var1 /* : Int */;
 long var2 /* : Int */;
 short int var3 /* : Bool */;
-short int var5 /* : Bool */;
+short int var4 /* : Bool */;
+short int var6 /* : Bool */;
 var1 = self->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <self:AbstractArrayRead[nullable Object]> */
 var2 = 0;
-{ /* Inline kernel#Int#== (var1,var2) */
-var5 = var1 == var2;
-var3 = var5;
-goto RET_LABEL4;
-RET_LABEL4:(void)0;
+{
+{ /* Inline kernel#Int#== (var1,var2) on <var1:Int> */
+var6 = var1 == var2;
+var4 = var6;
+goto RET_LABEL5;
+RET_LABEL5:(void)0;
+}
+var3 = var4;
 }
 var = var3;
 goto RET_LABEL;
@@ -54,25 +63,33 @@ int cltype;
 int idtype;
 const struct type* type_struct;
 short int is_nullable;
+const char* var_class_name;
 val* var_item /* var item: nullable Object */;
 long var2 /* : Int */;
 long var_i /* var i: Int */;
 long var3 /* : Int */;
+long var5 /* : Int */;
 long var_l /* var l: Int */;
-short int var4 /* : Bool */;
 short int var6 /* : Bool */;
-int cltype7;
-int idtype8;
-short int var9 /* : Bool */;
-val* var10 /* : nullable Object */;
-short int var11 /* : Bool */;
+short int var8 /* : Bool */;
+int cltype9;
+int idtype10;
+const char* var_class_name11;
 short int var12 /* : Bool */;
-long var13 /* : Int */;
-long var14 /* : Int */;
-long var16 /* : Int */;
-short int var17 /* : Bool */;
-/* Covariant cast for argument 0 (item) <p0:nullable Object> isa Collection#0 */
-/* <p0:nullable Object> isa Collection#0 */
+val* var13 /* : nullable Object */;
+short int var14 /* : Bool */;
+short int var15 /* : Bool */;
+short int var16 /* : Bool */;
+long var17 /* : Int */;
+long var18 /* : Int */;
+short int var20 /* : Bool */;
+int cltype21;
+int idtype22;
+const char* var_class_name23;
+long var24 /* : Int */;
+short int var25 /* : Bool */;
+/* Covariant cast for argument 0 (item) <p0:nullable Object> isa E */
+/* <p0:nullable Object> isa E */
 type_struct = self->type->resolution_table->types[COLOR_abstract_collection__Collection_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -86,55 +103,83 @@ var1 = 0;
 var1 = p0->type->type_table[cltype] == idtype;
 }
 }
-if (!var1) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 28);
-exit(1);
+if (unlikely(!var1)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "E", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 28);
+show_backtrace(1);
 }
 var_item = p0;
 var2 = 0;
 var_i = var2;
-var3 = ((long (*)(val*))(self->class->vft[COLOR_abstract_collection__Collection__length]))(self) /* length on <self:AbstractArrayRead[nullable Object]>*/;
+{
+{ /* Inline array#AbstractArrayRead#length (self) on <self:AbstractArrayRead[nullable Object]> */
+var5 = self->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <self:AbstractArrayRead[nullable Object]> */
+var3 = var5;
+RET_LABEL4:(void)0;
+}
+}
 var_l = var3;
 for(;;) {
-{ /* Inline kernel#Int#< (var_i,var_l) */
+{
+{ /* Inline kernel#Int#< (var_i,var_l) on <var_i:Int> */
 /* Covariant cast for argument 0 (i) <var_l:Int> isa OTHER */
 /* <var_l:Int> isa OTHER */
-var6 = 1; /* easy <var_l:Int> isa OTHER*/
-if (!var6) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 257);
-exit(1);
+var8 = 1; /* easy <var_l:Int> isa OTHER*/
+if (unlikely(!var8)) {
+var_class_name11 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name11);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 371);
+show_backtrace(1);
 }
-var9 = var_i < var_l;
-var4 = var9;
-goto RET_LABEL5;
-RET_LABEL5:(void)0;
+var12 = var_i < var_l;
+var6 = var12;
+goto RET_LABEL7;
+RET_LABEL7:(void)0;
 }
-if (!var4) break;
-var10 = ((val* (*)(val*, long))(self->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(self, var_i) /* [] on <self:AbstractArrayRead[nullable Object]>*/;
-if (var10 == NULL) {
-var11 = (var_item == NULL);
+}
+if (var6){
+{
+var13 = array__Array___91d_93d(self, var_i);
+}
+if (var13 == NULL) {
+var14 = (var_item == NULL);
 } else {
-var11 = ((short int (*)(val*, val*))(var10->class->vft[COLOR_kernel__Object___61d_61d]))(var10, var_item) /* == on <var10:nullable Object>*/;
+var15 = ((short int (*)(val*, val*))(var13->class->vft[COLOR_kernel__Object___61d_61d]))(var13, var_item) /* == on <var13:nullable Object>*/;
+var14 = var15;
 }
-if (var11){
-var12 = 1;
-var = var12;
+if (var14){
+var16 = 1;
+var = var16;
 goto RET_LABEL;
 } else {
 }
-var13 = 1;
-{ /* Inline kernel#Int#+ (var_i,var13) */
-var16 = var_i + var13;
-var14 = var16;
-goto RET_LABEL15;
-RET_LABEL15:(void)0;
+var17 = 1;
+{
+{ /* Inline kernel#Int#+ (var_i,var17) on <var_i:Int> */
+/* Covariant cast for argument 0 (i) <var17:Int> isa OTHER */
+/* <var17:Int> isa OTHER */
+var20 = 1; /* easy <var17:Int> isa OTHER*/
+if (unlikely(!var20)) {
+var_class_name23 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name23);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 374);
+show_backtrace(1);
+}
+var24 = var_i + var17;
+var18 = var24;
+goto RET_LABEL19;
+RET_LABEL19:(void)0;
+}
+}
+var_i = var18;
+} else {
+goto BREAK_label;
 }
-var_i = var14;
-CONTINUE_label: (void)0;
 }
 BREAK_label: (void)0;
-var17 = 0;
-var = var17;
+var25 = 0;
+var = var25;
 goto RET_LABEL;
 RET_LABEL:;
 return var;
@@ -148,34 +193,21 @@ var = var1;
 RET_LABEL:;
 return var;
 }
-/* method array#AbstractArrayRead#has_only for (self: AbstractArrayRead[nullable Object], nullable Object): Bool */
-short int array__AbstractArrayRead__has_only(val* self, val* p0) {
-short int var /* : Bool */;
+/* method array#AbstractArrayRead#index_of for (self: AbstractArrayRead[nullable Object], nullable Object): Int */
+long array__AbstractArrayRead__index_of(val* self, val* p0) {
+long var /* : Int */;
 short int var1 /* : Bool */;
 int cltype;
 int idtype;
 const struct type* type_struct;
 short int is_nullable;
+const char* var_class_name;
 val* var_item /* var item: nullable Object */;
 long var2 /* : Int */;
-long var_i /* var i: Int */;
 long var3 /* : Int */;
-long var_l /* var l: Int */;
-short int var4 /* : Bool */;
-short int var6 /* : Bool */;
-int cltype7;
-int idtype8;
-short int var9 /* : Bool */;
-val* var10 /* : nullable Object */;
-short int var11 /* : Bool */;
-short int var12 /* : Bool */;
-long var13 /* : Int */;
-long var14 /* : Int */;
-long var16 /* : Int */;
-short int var17 /* : Bool */;
-/* Covariant cast for argument 0 (item) <p0:nullable Object> isa Collection#0 */
-/* <p0:nullable Object> isa Collection#0 */
-type_struct = self->type->resolution_table->types[COLOR_abstract_collection__Collection_FT0];
+/* Covariant cast for argument 0 (item) <p0:nullable Object> isa E */
+/* <p0:nullable Object> isa E */
+type_struct = self->type->resolution_table->types[COLOR_abstract_collection__SequenceRead_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
 is_nullable = type_struct->is_nullable;
@@ -188,99 +220,54 @@ var1 = 0;
 var1 = p0->type->type_table[cltype] == idtype;
 }
 }
-if (!var1) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 39);
-exit(1);
+if (unlikely(!var1)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "E", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 62);
+show_backtrace(1);
 }
 var_item = p0;
 var2 = 0;
-var_i = var2;
-var3 = ((long (*)(val*))(self->class->vft[COLOR_abstract_collection__Collection__length]))(self) /* length on <self:AbstractArrayRead[nullable Object]>*/;
-var_l = var3;
-for(;;) {
-{ /* Inline kernel#Int#< (var_i,var_l) */
-/* Covariant cast for argument 0 (i) <var_l:Int> isa OTHER */
-/* <var_l:Int> isa OTHER */
-var6 = 1; /* easy <var_l:Int> isa OTHER*/
-if (!var6) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 257);
-exit(1);
-}
-var9 = var_i < var_l;
-var4 = var9;
-goto RET_LABEL5;
-RET_LABEL5:(void)0;
-}
-if (!var4) break;
-var10 = ((val* (*)(val*, long))(self->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(self, var_i) /* [] on <self:AbstractArrayRead[nullable Object]>*/;
-if (var10 == NULL) {
-var11 = (var_item != NULL);
-} else {
-var11 = ((short int (*)(val*, val*))(var10->class->vft[COLOR_kernel__Object___33d_61d]))(var10, var_item) /* != on <var10:nullable Object>*/;
-}
-if (var11){
-var12 = 0;
-var = var12;
-goto RET_LABEL;
-} else {
-}
-var13 = 1;
-{ /* Inline kernel#Int#+ (var_i,var13) */
-var16 = var_i + var13;
-var14 = var16;
-goto RET_LABEL15;
-RET_LABEL15:(void)0;
-}
-var_i = var14;
-CONTINUE_label: (void)0;
+{
+var3 = array__AbstractArrayRead__index_of_from(self, var_item, var2);
 }
-BREAK_label: (void)0;
-var17 = 1;
-var = var17;
+var = var3;
 goto RET_LABEL;
 RET_LABEL:;
 return var;
 }
-/* method array#AbstractArrayRead#has_only for (self: Object, nullable Object): Bool */
-short int VIRTUAL_array__AbstractArrayRead__has_only(val* self, val* p0) {
-short int var /* : Bool */;
-short int var1 /* : Bool */;
-var1 = array__AbstractArrayRead__has_only(self, p0);
+/* method array#AbstractArrayRead#index_of for (self: Object, nullable Object): Int */
+long VIRTUAL_array__AbstractArrayRead__index_of(val* self, val* p0) {
+long var /* : Int */;
+long var1 /* : Int */;
+var1 = array__AbstractArrayRead__index_of(self, p0);
 var = var1;
 RET_LABEL:;
 return var;
 }
-/* method array#AbstractArrayRead#count for (self: AbstractArrayRead[nullable Object], nullable Object): Int */
-long array__AbstractArrayRead__count(val* self, val* p0) {
+/* method array#AbstractArrayRead#last_index_of for (self: AbstractArrayRead[nullable Object], nullable Object): Int */
+long array__AbstractArrayRead__last_index_of(val* self, val* p0) {
 long var /* : Int */;
 short int var1 /* : Bool */;
 int cltype;
 int idtype;
 const struct type* type_struct;
 short int is_nullable;
+const char* var_class_name;
 val* var_item /* var item: nullable Object */;
 long var2 /* : Int */;
-long var_res /* var res: Int */;
-long var3 /* : Int */;
-long var_i /* var i: Int */;
 long var4 /* : Int */;
-long var_l /* var l: Int */;
-short int var5 /* : Bool */;
-short int var7 /* : Bool */;
-int cltype8;
-int idtype9;
-short int var10 /* : Bool */;
-val* var11 /* : nullable Object */;
-short int var12 /* : Bool */;
+long var5 /* : Int */;
+long var6 /* : Int */;
+short int var8 /* : Bool */;
+int cltype9;
+int idtype10;
+const char* var_class_name11;
+long var12 /* : Int */;
 long var13 /* : Int */;
-long var14 /* : Int */;
-long var16 /* : Int */;
-long var17 /* : Int */;
-long var18 /* : Int */;
-long var20 /* : Int */;
-/* Covariant cast for argument 0 (item) <p0:nullable Object> isa Collection#0 */
-/* <p0:nullable Object> isa Collection#0 */
-type_struct = self->type->resolution_table->types[COLOR_abstract_collection__Collection_FT0];
+/* Covariant cast for argument 0 (item) <p0:nullable Object> isa E */
+/* <p0:nullable Object> isa E */
+type_struct = self->type->resolution_table->types[COLOR_array__AbstractArrayRead_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
 is_nullable = type_struct->is_nullable;
@@ -293,88 +280,92 @@ var1 = 0;
 var1 = p0->type->type_table[cltype] == idtype;
 }
 }
-if (!var1) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 50);
-exit(1);
+if (unlikely(!var1)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "E", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 64);
+show_backtrace(1);
 }
 var_item = p0;
-var2 = 0;
-var_res = var2;
-var3 = 0;
-var_i = var3;
-var4 = ((long (*)(val*))(self->class->vft[COLOR_abstract_collection__Collection__length]))(self) /* length on <self:AbstractArrayRead[nullable Object]>*/;
-var_l = var4;
-for(;;) {
-{ /* Inline kernel#Int#< (var_i,var_l) */
-/* Covariant cast for argument 0 (i) <var_l:Int> isa OTHER */
-/* <var_l:Int> isa OTHER */
-var7 = 1; /* easy <var_l:Int> isa OTHER*/
-if (!var7) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 257);
-exit(1);
-}
-var10 = var_i < var_l;
-var5 = var10;
-goto RET_LABEL6;
-RET_LABEL6:(void)0;
-}
-if (!var5) break;
-var11 = ((val* (*)(val*, long))(self->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(self, var_i) /* [] on <self:AbstractArrayRead[nullable Object]>*/;
-if (var11 == NULL) {
-var12 = (var_item == NULL);
-} else {
-var12 = ((short int (*)(val*, val*))(var11->class->vft[COLOR_kernel__Object___61d_61d]))(var11, var_item) /* == on <var11:nullable Object>*/;
+{
+{ /* Inline array#AbstractArrayRead#length (self) on <self:AbstractArrayRead[nullable Object]> */
+var4 = self->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <self:AbstractArrayRead[nullable Object]> */
+var2 = var4;
+RET_LABEL3:(void)0;
 }
-if (var12){
-var13 = 1;
-{ /* Inline kernel#Int#+ (var_res,var13) */
-var16 = var_res + var13;
-var14 = var16;
-goto RET_LABEL15;
-RET_LABEL15:(void)0;
 }
-var_res = var14;
-} else {
+var5 = 1;
+{
+{ /* Inline kernel#Int#- (var2,var5) on <var2:Int> */
+/* Covariant cast for argument 0 (i) <var5:Int> isa OTHER */
+/* <var5:Int> isa OTHER */
+var8 = 1; /* easy <var5:Int> isa OTHER*/
+if (unlikely(!var8)) {
+var_class_name11 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name11);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 377);
+show_backtrace(1);
+}
+var12 = var2 - var5;
+var6 = var12;
+goto RET_LABEL7;
+RET_LABEL7:(void)0;
 }
-var17 = 1;
-{ /* Inline kernel#Int#+ (var_i,var17) */
-var20 = var_i + var17;
-var18 = var20;
-goto RET_LABEL19;
-RET_LABEL19:(void)0;
 }
-var_i = var18;
-CONTINUE_label: (void)0;
+{
+var13 = array__AbstractArrayRead__last_index_of_from(self, var_item, var6);
 }
-BREAK_label: (void)0;
-var = var_res;
+var = var13;
 goto RET_LABEL;
 RET_LABEL:;
 return var;
 }
-/* method array#AbstractArrayRead#count for (self: Object, nullable Object): Int */
-long VIRTUAL_array__AbstractArrayRead__count(val* self, val* p0) {
+/* method array#AbstractArrayRead#last_index_of for (self: Object, nullable Object): Int */
+long VIRTUAL_array__AbstractArrayRead__last_index_of(val* self, val* p0) {
 long var /* : Int */;
 long var1 /* : Int */;
-var1 = array__AbstractArrayRead__count(self, p0);
+var1 = array__AbstractArrayRead__last_index_of(self, p0);
 var = var1;
 RET_LABEL:;
 return var;
 }
-/* method array#AbstractArrayRead#index_of for (self: AbstractArrayRead[nullable Object], nullable Object): Int */
-long array__AbstractArrayRead__index_of(val* self, val* p0) {
+/* method array#AbstractArrayRead#index_of_from for (self: AbstractArrayRead[nullable Object], nullable Object, Int): Int */
+long array__AbstractArrayRead__index_of_from(val* self, val* p0, long p1) {
 long var /* : Int */;
 short int var1 /* : Bool */;
 int cltype;
 int idtype;
 const struct type* type_struct;
 short int is_nullable;
+const char* var_class_name;
 val* var_item /* var item: nullable Object */;
+long var_pos /* var pos: Int */;
+long var_i /* var i: Int */;
 long var2 /* : Int */;
-long var3 /* : Int */;
-/* Covariant cast for argument 0 (item) <p0:nullable Object> isa SequenceRead#0 */
-/* <p0:nullable Object> isa SequenceRead#0 */
-type_struct = self->type->resolution_table->types[COLOR_abstract_collection__SequenceRead_FT0];
+long var4 /* : Int */;
+long var_len /* var len: Int */;
+short int var5 /* : Bool */;
+short int var7 /* : Bool */;
+int cltype8;
+int idtype9;
+const char* var_class_name10;
+short int var11 /* : Bool */;
+val* var12 /* : nullable Object */;
+short int var13 /* : Bool */;
+short int var14 /* : Bool */;
+long var15 /* : Int */;
+long var16 /* : Int */;
+short int var18 /* : Bool */;
+int cltype19;
+int idtype20;
+const char* var_class_name21;
+long var22 /* : Int */;
+long var23 /* : Int */;
+long var24 /* : Int */;
+long var26 /* : Int */;
+/* Covariant cast for argument 0 (item) <p0:nullable Object> isa E */
+/* <p0:nullable Object> isa E */
+type_struct = self->type->resolution_table->types[COLOR_array__AbstractArrayRead_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
 is_nullable = type_struct->is_nullable;
@@ -387,219 +378,137 @@ var1 = 0;
 var1 = p0->type->type_table[cltype] == idtype;
 }
 }
-if (!var1) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 62);
-exit(1);
+if (unlikely(!var1)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "E", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 66);
+show_backtrace(1);
 }
 var_item = p0;
-var2 = 0;
-var3 = ((long (*)(val*, val*, long))(self->class->vft[COLOR_array__AbstractArrayRead__index_of_from]))(self, var_item, var2) /* index_of_from on <self:AbstractArrayRead[nullable Object]>*/;
-var = var3;
+var_pos = p1;
+var_i = var_pos;
+{
+{ /* Inline array#AbstractArrayRead#length (self) on <self:AbstractArrayRead[nullable Object]> */
+var4 = self->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <self:AbstractArrayRead[nullable Object]> */
+var2 = var4;
+RET_LABEL3:(void)0;
+}
+}
+var_len = var2;
+for(;;) {
+{
+{ /* Inline kernel#Int#< (var_i,var_len) on <var_i:Int> */
+/* Covariant cast for argument 0 (i) <var_len:Int> isa OTHER */
+/* <var_len:Int> isa OTHER */
+var7 = 1; /* easy <var_len:Int> isa OTHER*/
+if (unlikely(!var7)) {
+var_class_name10 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name10);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 371);
+show_backtrace(1);
+}
+var11 = var_i < var_len;
+var5 = var11;
+goto RET_LABEL6;
+RET_LABEL6:(void)0;
+}
+}
+if (var5){
+{
+var12 = array__Array___91d_93d(self, var_i);
+}
+if (var12 == NULL) {
+var13 = (var_item == NULL);
+} else {
+var14 = ((short int (*)(val*, val*))(var12->class->vft[COLOR_kernel__Object___61d_61d]))(var12, var_item) /* == on <var12:nullable Object>*/;
+var13 = var14;
+}
+if (var13){
+var = var_i;
+goto RET_LABEL;
+} else {
+}
+var15 = 1;
+{
+{ /* Inline kernel#Int#+ (var_i,var15) on <var_i:Int> */
+/* Covariant cast for argument 0 (i) <var15:Int> isa OTHER */
+/* <var15:Int> isa OTHER */
+var18 = 1; /* easy <var15:Int> isa OTHER*/
+if (unlikely(!var18)) {
+var_class_name21 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name21);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 374);
+show_backtrace(1);
+}
+var22 = var_i + var15;
+var16 = var22;
+goto RET_LABEL17;
+RET_LABEL17:(void)0;
+}
+}
+var_i = var16;
+} else {
+goto BREAK_label;
+}
+}
+BREAK_label: (void)0;
+var23 = 1;
+{
+{ /* Inline kernel#Int#unary - (var23) on <var23:Int> */
+var26 = -var23;
+var24 = var26;
+goto RET_LABEL25;
+RET_LABEL25:(void)0;
+}
+}
+var = var24;
 goto RET_LABEL;
 RET_LABEL:;
 return var;
 }
-/* method array#AbstractArrayRead#index_of for (self: Object, nullable Object): Int */
-long VIRTUAL_array__AbstractArrayRead__index_of(val* self, val* p0) {
+/* method array#AbstractArrayRead#index_of_from for (self: Object, nullable Object, Int): Int */
+long VIRTUAL_array__AbstractArrayRead__index_of_from(val* self, val* p0, long p1) {
 long var /* : Int */;
 long var1 /* : Int */;
-var1 = array__AbstractArrayRead__index_of(self, p0);
+var1 = array__AbstractArrayRead__index_of_from(self, p0, p1);
 var = var1;
 RET_LABEL:;
 return var;
 }
-/* method array#AbstractArrayRead#last_index_of for (self: AbstractArrayRead[nullable Object], nullable Object): Int */
-long array__AbstractArrayRead__last_index_of(val* self, val* p0) {
+/* method array#AbstractArrayRead#last_index_of_from for (self: AbstractArrayRead[nullable Object], nullable Object, Int): Int */
+long array__AbstractArrayRead__last_index_of_from(val* self, val* p0, long p1) {
 long var /* : Int */;
 short int var1 /* : Bool */;
 int cltype;
 int idtype;
 const struct type* type_struct;
 short int is_nullable;
+const char* var_class_name;
 val* var_item /* var item: nullable Object */;
-long var2 /* : Int */;
-long var3 /* : Int */;
-long var4 /* : Int */;
-long var6 /* : Int */;
-long var7 /* : Int */;
-/* Covariant cast for argument 0 (item) <p0:nullable Object> isa AbstractArrayRead#0 */
-/* <p0:nullable Object> isa AbstractArrayRead#0 */
-type_struct = self->type->resolution_table->types[COLOR_array__AbstractArrayRead_FT0];
-cltype = type_struct->color;
-idtype = type_struct->id;
-is_nullable = type_struct->is_nullable;
-if(p0 == NULL) {
-var1 = is_nullable;
-} else {
-if(cltype >= p0->type->table_size) {
-var1 = 0;
-} else {
-var1 = p0->type->type_table[cltype] == idtype;
-}
-}
-if (!var1) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 64);
-exit(1);
-}
-var_item = p0;
-var2 = ((long (*)(val*))(self->class->vft[COLOR_abstract_collection__Collection__length]))(self) /* length on <self:AbstractArrayRead[nullable Object]>*/;
-var3 = 1;
-{ /* Inline kernel#Int#- (var2,var3) */
-var6 = var2 - var3;
-var4 = var6;
-goto RET_LABEL5;
-RET_LABEL5:(void)0;
-}
-var7 = ((long (*)(val*, val*, long))(self->class->vft[COLOR_array__AbstractArrayRead__last_index_of_from]))(self, var_item, var4) /* last_index_of_from on <self:AbstractArrayRead[nullable Object]>*/;
-var = var7;
-goto RET_LABEL;
-RET_LABEL:;
-return var;
-}
-/* method array#AbstractArrayRead#last_index_of for (self: Object, nullable Object): Int */
-long VIRTUAL_array__AbstractArrayRead__last_index_of(val* self, val* p0) {
-long var /* : Int */;
-long var1 /* : Int */;
-var1 = array__AbstractArrayRead__last_index_of(self, p0);
-var = var1;
-RET_LABEL:;
-return var;
-}
-/* method array#AbstractArrayRead#index_of_from for (self: AbstractArrayRead[nullable Object], nullable Object, Int): Int */
-long array__AbstractArrayRead__index_of_from(val* self, val* p0, long p1) {
-long var /* : Int */;
-short int var1 /* : Bool */;
-int cltype;
-int idtype;
-const struct type* type_struct;
-short int is_nullable;
-val* var_item /* var item: nullable Object */;
-long var_pos /* var pos: Int */;
-long var_i /* var i: Int */;
-long var2 /* : Int */;
-long var_len /* var len: Int */;
-short int var3 /* : Bool */;
-short int var5 /* : Bool */;
-int cltype6;
-int idtype7;
-short int var8 /* : Bool */;
-val* var9 /* : nullable Object */;
-short int var10 /* : Bool */;
-long var11 /* : Int */;
-long var12 /* : Int */;
-long var14 /* : Int */;
-long var15 /* : Int */;
-long var16 /* : Int */;
-long var18 /* : Int */;
-/* Covariant cast for argument 0 (item) <p0:nullable Object> isa AbstractArrayRead#0 */
-/* <p0:nullable Object> isa AbstractArrayRead#0 */
-type_struct = self->type->resolution_table->types[COLOR_array__AbstractArrayRead_FT0];
-cltype = type_struct->color;
-idtype = type_struct->id;
-is_nullable = type_struct->is_nullable;
-if(p0 == NULL) {
-var1 = is_nullable;
-} else {
-if(cltype >= p0->type->table_size) {
-var1 = 0;
-} else {
-var1 = p0->type->type_table[cltype] == idtype;
-}
-}
-if (!var1) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 68);
-exit(1);
-}
-var_item = p0;
-var_pos = p1;
-var_i = var_pos;
-var2 = ((long (*)(val*))(self->class->vft[COLOR_abstract_collection__Collection__length]))(self) /* length on <self:AbstractArrayRead[nullable Object]>*/;
-var_len = var2;
-for(;;) {
-{ /* Inline kernel#Int#< (var_i,var_len) */
-/* Covariant cast for argument 0 (i) <var_len:Int> isa OTHER */
-/* <var_len:Int> isa OTHER */
-var5 = 1; /* easy <var_len:Int> isa OTHER*/
-if (!var5) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 257);
-exit(1);
-}
-var8 = var_i < var_len;
-var3 = var8;
-goto RET_LABEL4;
-RET_LABEL4:(void)0;
-}
-if (!var3) break;
-var9 = ((val* (*)(val*, long))(self->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(self, var_i) /* [] on <self:AbstractArrayRead[nullable Object]>*/;
-if (var9 == NULL) {
-var10 = (var_item == NULL);
-} else {
-var10 = ((short int (*)(val*, val*))(var9->class->vft[COLOR_kernel__Object___61d_61d]))(var9, var_item) /* == on <var9:nullable Object>*/;
-}
-if (var10){
-var = var_i;
-goto RET_LABEL;
-} else {
-}
-var11 = 1;
-{ /* Inline kernel#Int#+ (var_i,var11) */
-var14 = var_i + var11;
-var12 = var14;
-goto RET_LABEL13;
-RET_LABEL13:(void)0;
-}
-var_i = var12;
-CONTINUE_label: (void)0;
-}
-BREAK_label: (void)0;
-var15 = 1;
-{ /* Inline kernel#Int#unary - (var15) */
-var18 = -var15;
-var16 = var18;
-goto RET_LABEL17;
-RET_LABEL17:(void)0;
-}
-var = var16;
-goto RET_LABEL;
-RET_LABEL:;
-return var;
-}
-/* method array#AbstractArrayRead#index_of_from for (self: Object, nullable Object, Int): Int */
-long VIRTUAL_array__AbstractArrayRead__index_of_from(val* self, val* p0, long p1) {
-long var /* : Int */;
-long var1 /* : Int */;
-var1 = array__AbstractArrayRead__index_of_from(self, p0, p1);
-var = var1;
-RET_LABEL:;
-return var;
-}
-/* method array#AbstractArrayRead#last_index_of_from for (self: AbstractArrayRead[nullable Object], nullable Object, Int): Int */
-long array__AbstractArrayRead__last_index_of_from(val* self, val* p0, long p1) {
-long var /* : Int */;
-short int var1 /* : Bool */;
-int cltype;
-int idtype;
-const struct type* type_struct;
-short int is_nullable;
-val* var_item /* var item: nullable Object */;
-long var_pos /* var pos: Int */;
-long var_i /* var i: Int */;
+long var_pos /* var pos: Int */;
+long var_i /* var i: Int */;
 long var2 /* : Int */;
 short int var3 /* : Bool */;
 short int var5 /* : Bool */;
 int cltype6;
 int idtype7;
-short int var8 /* : Bool */;
-val* var9 /* : nullable Object */;
-short int var10 /* : Bool */;
-long var11 /* : Int */;
-long var12 /* : Int */;
+const char* var_class_name8;
+short int var9 /* : Bool */;
+val* var10 /* : nullable Object */;
+short int var11 /* : Bool */;
+short int var12 /* : Bool */;
+long var13 /* : Int */;
 long var14 /* : Int */;
-long var15 /* : Int */;
-long var16 /* : Int */;
-long var18 /* : Int */;
-/* Covariant cast for argument 0 (item) <p0:nullable Object> isa AbstractArrayRead#0 */
-/* <p0:nullable Object> isa AbstractArrayRead#0 */
+short int var16 /* : Bool */;
+int cltype17;
+int idtype18;
+const char* var_class_name19;
+long var20 /* : Int */;
+long var21 /* : Int */;
+long var22 /* : Int */;
+long var24 /* : Int */;
+/* Covariant cast for argument 0 (item) <p0:nullable Object> isa E */
+/* <p0:nullable Object> isa E */
 type_struct = self->type->resolution_table->types[COLOR_array__AbstractArrayRead_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -613,59 +522,83 @@ var1 = 0;
 var1 = p0->type->type_table[cltype] == idtype;
 }
 }
-if (!var1) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 83);
-exit(1);
+if (unlikely(!var1)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "E", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 79);
+show_backtrace(1);
 }
 var_item = p0;
 var_pos = p1;
 var_i = var_pos;
 for(;;) {
 var2 = 0;
-{ /* Inline kernel#Int#>= (var_i,var2) */
+{
+{ /* Inline kernel#Int#>= (var_i,var2) on <var_i:Int> */
 /* Covariant cast for argument 0 (i) <var2:Int> isa OTHER */
 /* <var2:Int> isa OTHER */
 var5 = 1; /* easy <var2:Int> isa OTHER*/
-if (!var5) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 258);
-exit(1);
-}
-var8 = var_i >= var2;
-var3 = var8;
+if (unlikely(!var5)) {
+var_class_name8 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name8);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 372);
+show_backtrace(1);
+}
+var9 = var_i >= var2;
+var3 = var9;
 goto RET_LABEL4;
 RET_LABEL4:(void)0;
 }
-if (!var3) break;
-var9 = ((val* (*)(val*, long))(self->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(self, var_i) /* [] on <self:AbstractArrayRead[nullable Object]>*/;
-if (var9 == NULL) {
-var10 = (var_item == NULL);
+}
+if (var3){
+{
+var10 = array__Array___91d_93d(self, var_i);
+}
+if (var10 == NULL) {
+var11 = (var_item == NULL);
 } else {
-var10 = ((short int (*)(val*, val*))(var9->class->vft[COLOR_kernel__Object___61d_61d]))(var9, var_item) /* == on <var9:nullable Object>*/;
+var12 = ((short int (*)(val*, val*))(var10->class->vft[COLOR_kernel__Object___61d_61d]))(var10, var_item) /* == on <var10:nullable Object>*/;
+var11 = var12;
 }
-if (var10){
+if (var11){
 var = var_i;
 goto RET_LABEL;
 } else {
-var11 = 1;
-{ /* Inline kernel#Int#- (var_i,var11) */
-var14 = var_i - var11;
-var12 = var14;
-goto RET_LABEL13;
-RET_LABEL13:(void)0;
+var13 = 1;
+{
+{ /* Inline kernel#Int#- (var_i,var13) on <var_i:Int> */
+/* Covariant cast for argument 0 (i) <var13:Int> isa OTHER */
+/* <var13:Int> isa OTHER */
+var16 = 1; /* easy <var13:Int> isa OTHER*/
+if (unlikely(!var16)) {
+var_class_name19 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name19);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 377);
+show_backtrace(1);
+}
+var20 = var_i - var13;
+var14 = var20;
+goto RET_LABEL15;
+RET_LABEL15:(void)0;
+}
+}
+var_i = var14;
 }
-var_i = var12;
+} else {
+goto BREAK_label;
 }
-CONTINUE_label: (void)0;
 }
 BREAK_label: (void)0;
-var15 = 1;
-{ /* Inline kernel#Int#unary - (var15) */
-var18 = -var15;
-var16 = var18;
-goto RET_LABEL17;
-RET_LABEL17:(void)0;
+var21 = 1;
+{
+{ /* Inline kernel#Int#unary - (var21) on <var21:Int> */
+var24 = -var21;
+var22 = var24;
+goto RET_LABEL23;
+RET_LABEL23:(void)0;
 }
-var = var16;
+}
+var = var22;
 goto RET_LABEL;
 RET_LABEL:;
 return var;
@@ -691,44 +624,71 @@ short int var4 /* : Bool */;
 short int var6 /* : Bool */;
 int cltype;
 int idtype;
+const char* var_class_name;
 short int var7 /* : Bool */;
 long var8 /* : Int */;
 long var9 /* : Int */;
-long var11 /* : Int */;
-val* var12 /* : nullable Object */;
+short int var11 /* : Bool */;
+int cltype12;
+int idtype13;
+const char* var_class_name14;
+long var15 /* : Int */;
+val* var16 /* : nullable Object */;
 var1 = self->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <self:AbstractArrayRead[nullable Object]> */
 var_cmp = var1;
 var2 = NEW_array__Array(self->type->resolution_table->types[COLOR_array__Arrayarray__AbstractArrayRead_FT0]);
-((void (*)(val*, long))(var2->class->vft[COLOR_array__Array__with_capacity]))(var2, var_cmp) /* with_capacity on <var2:Array[nullable Object]>*/;
-CHECK_NEW_array__Array(var2);
+{
+array__Array__with_capacity(var2, var_cmp); /* Direct call array#Array#with_capacity on <var2:Array[nullable Object]>*/
+}
 var_result = var2;
 for(;;) {
 var3 = 0;
-{ /* Inline kernel#Int#> (var_cmp,var3) */
+{
+{ /* Inline kernel#Int#> (var_cmp,var3) on <var_cmp:Int> */
 /* Covariant cast for argument 0 (i) <var3:Int> isa OTHER */
 /* <var3:Int> isa OTHER */
 var6 = 1; /* easy <var3:Int> isa OTHER*/
-if (!var6) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 259);
-exit(1);
+if (unlikely(!var6)) {
+var_class_name = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 373);
+show_backtrace(1);
 }
 var7 = var_cmp > var3;
 var4 = var7;
 goto RET_LABEL5;
 RET_LABEL5:(void)0;
 }
-if (!var4) break;
+}
+if (var4){
 var8 = 1;
-{ /* Inline kernel#Int#- (var_cmp,var8) */
-var11 = var_cmp - var8;
-var9 = var11;
+{
+{ /* Inline kernel#Int#- (var_cmp,var8) on <var_cmp:Int> */
+/* Covariant cast for argument 0 (i) <var8:Int> isa OTHER */
+/* <var8:Int> isa OTHER */
+var11 = 1; /* easy <var8:Int> isa OTHER*/
+if (unlikely(!var11)) {
+var_class_name14 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name14);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 377);
+show_backtrace(1);
+}
+var15 = var_cmp - var8;
+var9 = var15;
 goto RET_LABEL10;
 RET_LABEL10:(void)0;
 }
+}
 var_cmp = var9;
-var12 = ((val* (*)(val*, long))(self->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(self, var_cmp) /* [] on <self:AbstractArrayRead[nullable Object]>*/;
-((void (*)(val*, val*))(var_result->class->vft[COLOR_abstract_collection__SimpleCollection__add]))(var_result, var12) /* add on <var_result:Array[nullable Object]>*/;
-CONTINUE_label: (void)0;
+{
+var16 = array__Array___91d_93d(self, var_cmp);
+}
+{
+array__Array__add(var_result, var16); /* Direct call array#Array#add on <var_result:Array[nullable Object]>*/
+}
+} else {
+goto BREAK_label;
+}
 }
 BREAK_label: (void)0;
 var = var_result;
@@ -751,6 +711,7 @@ short int var /* : Bool */;
 int cltype;
 int idtype;
 const struct type* type_struct;
+const char* var_class_name;
 long var_start /* var start: Int */;
 long var_len /* var len: Int */;
 val* var_dest /* var dest: AbstractArray[nullable Object] */;
@@ -761,17 +722,30 @@ short int var2 /* : Bool */;
 short int var4 /* : Bool */;
 int cltype5;
 int idtype6;
-short int var7 /* : Bool */;
-long var8 /* : Int */;
+const char* var_class_name7;
+short int var8 /* : Bool */;
 long var9 /* : Int */;
-long var11 /* : Int */;
-long var12 /* : Int */;
-long var14 /* : Int */;
-long var15 /* : Int */;
+long var10 /* : Int */;
+short int var12 /* : Bool */;
+int cltype13;
+int idtype14;
+const char* var_class_name15;
+long var16 /* : Int */;
 long var17 /* : Int */;
-val* var18 /* : nullable Object */;
-/* Covariant cast for argument 2 (dest) <p2:AbstractArray[nullable Object]> isa AbstractArray[AbstractArrayRead#0] */
-/* <p2:AbstractArray[nullable Object]> isa AbstractArray[AbstractArrayRead#0] */
+short int var19 /* : Bool */;
+int cltype20;
+int idtype21;
+const char* var_class_name22;
+long var23 /* : Int */;
+long var24 /* : Int */;
+short int var26 /* : Bool */;
+int cltype27;
+int idtype28;
+const char* var_class_name29;
+long var30 /* : Int */;
+val* var31 /* : nullable Object */;
+/* Covariant cast for argument 2 (dest) <p2:AbstractArray[nullable Object]> isa AbstractArray[E] */
+/* <p2:AbstractArray[nullable Object]> isa AbstractArray[E] */
 type_struct = self->type->resolution_table->types[COLOR_array__AbstractArrayarray__AbstractArrayRead_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -780,9 +754,11 @@ var = 0;
 } else {
 var = p2->type->type_table[cltype] == idtype;
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 112);
-exit(1);
+if (unlikely(!var)) {
+var_class_name = p2 == NULL ? "null" : p2->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "AbstractArray[E]", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 106);
+show_backtrace(1);
 }
 var_start = p0;
 var_len = p1;
@@ -791,122 +767,93 @@ var_new_start = p3;
 var_i = var_len;
 for(;;) {
 var1 = 0;
-{ /* Inline kernel#Int#> (var_i,var1) */
+{
+{ /* Inline kernel#Int#> (var_i,var1) on <var_i:Int> */
 /* Covariant cast for argument 0 (i) <var1:Int> isa OTHER */
 /* <var1:Int> isa OTHER */
 var4 = 1; /* easy <var1:Int> isa OTHER*/
-if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 259);
-exit(1);
-}
-var7 = var_i > var1;
-var2 = var7;
+if (unlikely(!var4)) {
+var_class_name7 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name7);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 373);
+show_backtrace(1);
+}
+var8 = var_i > var1;
+var2 = var8;
 goto RET_LABEL3;
 RET_LABEL3:(void)0;
 }
-if (!var2) break;
-var8 = 1;
-{ /* Inline kernel#Int#- (var_i,var8) */
-var11 = var_i - var8;
-var9 = var11;
-goto RET_LABEL10;
-RET_LABEL10:(void)0;
 }
-var_i = var9;
-{ /* Inline kernel#Int#+ (var_new_start,var_i) */
-var14 = var_new_start + var_i;
-var12 = var14;
-goto RET_LABEL13;
-RET_LABEL13:(void)0;
+if (var2){
+var9 = 1;
+{
+{ /* Inline kernel#Int#- (var_i,var9) on <var_i:Int> */
+/* Covariant cast for argument 0 (i) <var9:Int> isa OTHER */
+/* <var9:Int> isa OTHER */
+var12 = 1; /* easy <var9:Int> isa OTHER*/
+if (unlikely(!var12)) {
+var_class_name15 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name15);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 377);
+show_backtrace(1);
+}
+var16 = var_i - var9;
+var10 = var16;
+goto RET_LABEL11;
+RET_LABEL11:(void)0;
 }
-{ /* Inline kernel#Int#+ (var_start,var_i) */
-var17 = var_start + var_i;
-var15 = var17;
-goto RET_LABEL16;
-RET_LABEL16:(void)0;
 }
-var18 = ((val* (*)(val*, long))(self->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(self, var15) /* [] on <self:AbstractArrayRead[nullable Object]>*/;
-((void (*)(val*, long, val*))(var_dest->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(var_dest, var12, var18) /* []= on <var_dest:AbstractArray[nullable Object]>*/;
-CONTINUE_label: (void)0;
+var_i = var10;
+{
+{ /* Inline kernel#Int#+ (var_new_start,var_i) on <var_new_start:Int> */
+/* Covariant cast for argument 0 (i) <var_i:Int> isa OTHER */
+/* <var_i:Int> isa OTHER */
+var19 = 1; /* easy <var_i:Int> isa OTHER*/
+if (unlikely(!var19)) {
+var_class_name22 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name22);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 374);
+show_backtrace(1);
+}
+var23 = var_new_start + var_i;
+var17 = var23;
+goto RET_LABEL18;
+RET_LABEL18:(void)0;
+}
+}
+{
+{ /* Inline kernel#Int#+ (var_start,var_i) on <var_start:Int> */
+/* Covariant cast for argument 0 (i) <var_i:Int> isa OTHER */
+/* <var_i:Int> isa OTHER */
+var26 = 1; /* easy <var_i:Int> isa OTHER*/
+if (unlikely(!var26)) {
+var_class_name29 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name29);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 374);
+show_backtrace(1);
+}
+var30 = var_start + var_i;
+var24 = var30;
+goto RET_LABEL25;
+RET_LABEL25:(void)0;
+}
+}
+{
+var31 = array__Array___91d_93d(self, var24);
+}
+{
+array__Array___91d_93d_61d(var_dest, var17, var31); /* Direct call array#Array#[]= on <var_dest:AbstractArray[nullable Object]>*/
+}
+} else {
+goto BREAK_label;
+}
 }
 BREAK_label: (void)0;
 RET_LABEL:;
 }
 /* method array#AbstractArrayRead#copy_to for (self: Object, Int, Int, AbstractArray[nullable Object], Int) */
 void VIRTUAL_array__AbstractArrayRead__copy_to(val* self, long p0, long p1, val* p2, long p3) {
-array__AbstractArrayRead__copy_to(self, p0, p1, p2, p3);
-RET_LABEL:;
-}
-/* method array#AbstractArrayRead#output for (self: AbstractArrayRead[nullable Object]) */
-void array__AbstractArrayRead__output(val* self) {
-long var /* : Int */;
-long var_i /* var i: Int */;
-long var1 /* : Int */;
-long var_l /* var l: Int */;
-short int var2 /* : Bool */;
-short int var4 /* : Bool */;
-int cltype;
-int idtype;
-short int var5 /* : Bool */;
-val* var6 /* : nullable Object */;
-val* var_e /* var e: nullable Object */;
-val* var7 /* : null */;
-short int var8 /* : Bool */;
-long var9 /* : Int */;
-long var10 /* : Int */;
-long var12 /* : Int */;
-var = 0;
-var_i = var;
-var1 = ((long (*)(val*))(self->class->vft[COLOR_abstract_collection__Collection__length]))(self) /* length on <self:AbstractArrayRead[nullable Object]>*/;
-var_l = var1;
-for(;;) {
-{ /* Inline kernel#Int#< (var_i,var_l) */
-/* Covariant cast for argument 0 (i) <var_l:Int> isa OTHER */
-/* <var_l:Int> isa OTHER */
-var4 = 1; /* easy <var_l:Int> isa OTHER*/
-if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 257);
-exit(1);
-}
-var5 = var_i < var_l;
-var2 = var5;
-goto RET_LABEL3;
-RET_LABEL3:(void)0;
-}
-if (!var2) break;
-var6 = ((val* (*)(val*, long))(self->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(self, var_i) /* [] on <self:AbstractArrayRead[nullable Object]>*/;
-var_e = var6;
-var7 = NULL;
-if (var_e == NULL) {
-var8 = 0; /* is null */
-} else {
-var8 = 1; /* arg is null and recv is not */
-}
-if (var8){
-if (var_e == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "lib/standard/collection/array.nit", 134);
-exit(1);
-} else {
-((void (*)(val*))(var_e->class->vft[COLOR_kernel__Object__output]))(var_e) /* output on <var_e:nullable Object>*/;
-}
-} else {
-}
-var9 = 1;
-{ /* Inline kernel#Int#+ (var_i,var9) */
-var12 = var_i + var9;
-var10 = var12;
-goto RET_LABEL11;
-RET_LABEL11:(void)0;
-}
-var_i = var10;
-CONTINUE_label: (void)0;
-}
-BREAK_label: (void)0;
-RET_LABEL:;
-}
-/* method array#AbstractArrayRead#output for (self: Object) */
-void VIRTUAL_array__AbstractArrayRead__output(val* self) {
-array__AbstractArrayRead__output(self);
+array__AbstractArrayRead__copy_to(self, p0, p1, p2, p3); /* Direct call array#AbstractArrayRead#copy_to on <self:Object(AbstractArrayRead[nullable Object])>*/
 RET_LABEL:;
 }
 /* method array#AbstractArrayRead#iterator for (self: AbstractArrayRead[nullable Object]): ArrayIterator[nullable Object] */
@@ -914,8 +861,9 @@ val* array__AbstractArrayRead__iterator(val* self) {
 val* var /* : ArrayIterator[nullable Object] */;
 val* var1 /* : ArrayIterator[nullable Object] */;
 var1 = NEW_array__ArrayIterator(self->type->resolution_table->types[COLOR_array__ArrayIteratorarray__AbstractArrayRead_FT0]);
-((void (*)(val*, val*))(var1->class->vft[COLOR_array__ArrayIterator__init]))(var1, self) /* init on <var1:ArrayIterator[nullable Object]>*/;
-CHECK_NEW_array__ArrayIterator(var1);
+{
+array__ArrayIterator__init(var1, self); /* Direct call array#ArrayIterator#init on <var1:ArrayIterator[nullable Object]>*/
+}
 var = var1;
 goto RET_LABEL;
 RET_LABEL:;
@@ -930,26 +878,6 @@ var = var1;
 RET_LABEL:;
 return var;
 }
-/* method array#AbstractArrayRead#init for (self: AbstractArrayRead[nullable Object]) */
-void array__AbstractArrayRead__init(val* self) {
-RET_LABEL:;
-}
-/* method array#AbstractArrayRead#init for (self: Object) */
-void VIRTUAL_array__AbstractArrayRead__init(val* self) {
-array__AbstractArrayRead__init(self);
-RET_LABEL:;
-}
-/* method array#AbstractArray#enlarge for (self: AbstractArray[nullable Object], Int) */
-void array__AbstractArray__enlarge(val* self, long p0) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Deferred method called", "lib/standard/collection/array.nit", 147);
-exit(1);
-RET_LABEL:;
-}
-/* method array#AbstractArray#enlarge for (self: Object, Int) */
-void VIRTUAL_array__AbstractArray__enlarge(val* self, long p0) {
-array__AbstractArray__enlarge(self, p0);
-RET_LABEL:;
-}
 /* method array#AbstractArray#push for (self: AbstractArray[nullable Object], nullable Object) */
 void array__AbstractArray__push(val* self, val* p0) {
 short int var /* : Bool */;
@@ -957,9 +885,10 @@ int cltype;
 int idtype;
 const struct type* type_struct;
 short int is_nullable;
+const char* var_class_name;
 val* var_item /* var item: nullable Object */;
-/* Covariant cast for argument 0 (item) <p0:nullable Object> isa Sequence#0 */
-/* <p0:nullable Object> isa Sequence#0 */
+/* Covariant cast for argument 0 (item) <p0:nullable Object> isa E */
+/* <p0:nullable Object> isa E */
 type_struct = self->type->resolution_table->types[COLOR_abstract_collection__Sequence_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -973,17 +902,21 @@ var = 0;
 var = p0->type->type_table[cltype] == idtype;
 }
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 152);
-exit(1);
+if (unlikely(!var)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "E", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 147);
+show_backtrace(1);
 }
 var_item = p0;
-((void (*)(val*, val*))(self->class->vft[COLOR_abstract_collection__SimpleCollection__add]))(self, var_item) /* add on <self:AbstractArray[nullable Object]>*/;
+{
+array__Array__add(self, var_item); /* Direct call array#Array#add on <self:AbstractArray[nullable Object]>*/
+}
 RET_LABEL:;
 }
 /* method array#AbstractArray#push for (self: Object, nullable Object) */
 void VIRTUAL_array__AbstractArray__push(val* self, val* p0) {
-array__AbstractArray__push(self, p0);
+array__AbstractArray__push(self, p0); /* Direct call array#AbstractArray#push on <self:Object(AbstractArray[nullable Object])>*/
 RET_LABEL:;
 }
 /* method array#AbstractArray#pop for (self: AbstractArray[nullable Object]): nullable Object */
@@ -997,24 +930,44 @@ val* var_ /* var : AbstractArray[nullable Object] */;
 long var4 /* : Int */;
 long var5 /* : Int */;
 long var6 /* : Int */;
-long var8 /* : Int */;
-var1 = ((short int (*)(val*))(self->class->vft[COLOR_abstract_collection__Collection__is_empty]))(self) /* is_empty on <self:AbstractArray[nullable Object]>*/;
+short int var8 /* : Bool */;
+int cltype;
+int idtype;
+const char* var_class_name;
+long var9 /* : Int */;
+{
+var1 = array__AbstractArrayRead__is_empty(self);
+}
 var2 = !var1;
-if (!var2) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert \'not_empty\' failed", "lib/standard/collection/array.nit", 156);
-exit(1);
+if (unlikely(!var2)) {
+PRINT_ERROR("Runtime error: %s", "Assert \'not_empty\' failed");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 151);
+show_backtrace(1);
+}
+{
+var3 = abstract_collection__SequenceRead__last(self);
 }
-var3 = ((val* (*)(val*))(self->class->vft[COLOR_abstract_collection__SequenceRead__last]))(self) /* last on <self:AbstractArray[nullable Object]>*/;
 var_r = var3;
 var_ = self;
 var4 = var_->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <var_:AbstractArray[nullable Object]> */
 var5 = 1;
-{ /* Inline kernel#Int#- (var4,var5) */
-var8 = var4 - var5;
-var6 = var8;
+{
+{ /* Inline kernel#Int#- (var4,var5) on <var4:Int> */
+/* Covariant cast for argument 0 (i) <var5:Int> isa OTHER */
+/* <var5:Int> isa OTHER */
+var8 = 1; /* easy <var5:Int> isa OTHER*/
+if (unlikely(!var8)) {
+var_class_name = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 377);
+show_backtrace(1);
+}
+var9 = var4 - var5;
+var6 = var9;
 goto RET_LABEL7;
 RET_LABEL7:(void)0;
 }
+}
 var_->attrs[COLOR_array__AbstractArrayRead___length].l = var6; /* _length on <var_:AbstractArray[nullable Object]> */
 var = var_r;
 goto RET_LABEL;
@@ -1040,77 +993,145 @@ val* var_r /* var r: nullable Object */;
 long var4 /* : Int */;
 long var_i /* var i: Int */;
 long var5 /* : Int */;
+long var7 /* : Int */;
 long var_l /* var l: Int */;
-short int var6 /* : Bool */;
 short int var8 /* : Bool */;
+short int var10 /* : Bool */;
 int cltype;
 int idtype;
-short int var9 /* : Bool */;
-long var10 /* : Int */;
-long var11 /* : Int */;
+const char* var_class_name;
+short int var11 /* : Bool */;
+long var12 /* : Int */;
 long var13 /* : Int */;
-val* var14 /* : nullable Object */;
-long var15 /* : Int */;
-long var16 /* : Int */;
-long var18 /* : Int */;
+short int var15 /* : Bool */;
+int cltype16;
+int idtype17;
+const char* var_class_name18;
 long var19 /* : Int */;
-long var20 /* : Int */;
+val* var20 /* : nullable Object */;
+long var21 /* : Int */;
 long var22 /* : Int */;
-var1 = ((short int (*)(val*))(self->class->vft[COLOR_abstract_collection__Collection__is_empty]))(self) /* is_empty on <self:AbstractArray[nullable Object]>*/;
+short int var24 /* : Bool */;
+int cltype25;
+int idtype26;
+const char* var_class_name27;
+long var28 /* : Int */;
+long var29 /* : Int */;
+long var30 /* : Int */;
+short int var32 /* : Bool */;
+int cltype33;
+int idtype34;
+const char* var_class_name35;
+long var36 /* : Int */;
+{
+var1 = array__AbstractArrayRead__is_empty(self);
+}
 var2 = !var1;
-if (!var2) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert \'not_empty\' failed", "lib/standard/collection/array.nit", 164);
-exit(1);
+if (unlikely(!var2)) {
+PRINT_ERROR("Runtime error: %s", "Assert \'not_empty\' failed");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 159);
+show_backtrace(1);
+}
+{
+var3 = abstract_collection__SequenceRead__first(self);
 }
-var3 = ((val* (*)(val*))(self->class->vft[COLOR_abstract_collection__Collection__first]))(self) /* first on <self:AbstractArray[nullable Object]>*/;
 var_r = var3;
 var4 = 1;
 var_i = var4;
-var5 = ((long (*)(val*))(self->class->vft[COLOR_abstract_collection__Collection__length]))(self) /* length on <self:AbstractArray[nullable Object]>*/;
+{
+{ /* Inline array#AbstractArrayRead#length (self) on <self:AbstractArray[nullable Object]> */
+var7 = self->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <self:AbstractArray[nullable Object]> */
+var5 = var7;
+RET_LABEL6:(void)0;
+}
+}
 var_l = var5;
 for(;;) {
-{ /* Inline kernel#Int#< (var_i,var_l) */
+{
+{ /* Inline kernel#Int#< (var_i,var_l) on <var_i:Int> */
 /* Covariant cast for argument 0 (i) <var_l:Int> isa OTHER */
 /* <var_l:Int> isa OTHER */
-var8 = 1; /* easy <var_l:Int> isa OTHER*/
-if (!var8) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 257);
-exit(1);
+var10 = 1; /* easy <var_l:Int> isa OTHER*/
+if (unlikely(!var10)) {
+var_class_name = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 371);
+show_backtrace(1);
+}
+var11 = var_i < var_l;
+var8 = var11;
+goto RET_LABEL9;
+RET_LABEL9:(void)0;
 }
-var9 = var_i < var_l;
-var6 = var9;
-goto RET_LABEL7;
-RET_LABEL7:(void)0;
 }
-if (!var6) break;
-var10 = 1;
-{ /* Inline kernel#Int#- (var_i,var10) */
-var13 = var_i - var10;
-var11 = var13;
-goto RET_LABEL12;
-RET_LABEL12:(void)0;
+if (var8){
+var12 = 1;
+{
+{ /* Inline kernel#Int#- (var_i,var12) on <var_i:Int> */
+/* Covariant cast for argument 0 (i) <var12:Int> isa OTHER */
+/* <var12:Int> isa OTHER */
+var15 = 1; /* easy <var12:Int> isa OTHER*/
+if (unlikely(!var15)) {
+var_class_name18 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name18);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 377);
+show_backtrace(1);
+}
+var19 = var_i - var12;
+var13 = var19;
+goto RET_LABEL14;
+RET_LABEL14:(void)0;
+}
+}
+{
+var20 = array__Array___91d_93d(self, var_i);
+}
+{
+array__Array___91d_93d_61d(self, var13, var20); /* Direct call array#Array#[]= on <self:AbstractArray[nullable Object]>*/
+}
+var21 = 1;
+{
+{ /* Inline kernel#Int#+ (var_i,var21) on <var_i:Int> */
+/* Covariant cast for argument 0 (i) <var21:Int> isa OTHER */
+/* <var21:Int> isa OTHER */
+var24 = 1; /* easy <var21:Int> isa OTHER*/
+if (unlikely(!var24)) {
+var_class_name27 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name27);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 374);
+show_backtrace(1);
+}
+var28 = var_i + var21;
+var22 = var28;
+goto RET_LABEL23;
+RET_LABEL23:(void)0;
 }
-var14 = ((val* (*)(val*, long))(self->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(self, var_i) /* [] on <self:AbstractArray[nullable Object]>*/;
-((void (*)(val*, long, val*))(self->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(self, var11, var14) /* []= on <self:AbstractArray[nullable Object]>*/;
-var15 = 1;
-{ /* Inline kernel#Int#+ (var_i,var15) */
-var18 = var_i + var15;
-var16 = var18;
-goto RET_LABEL17;
-RET_LABEL17:(void)0;
 }
-var_i = var16;
-CONTINUE_label: (void)0;
+var_i = var22;
+} else {
+goto BREAK_label;
+}
 }
 BREAK_label: (void)0;
-var19 = 1;
-{ /* Inline kernel#Int#- (var_l,var19) */
-var22 = var_l - var19;
-var20 = var22;
-goto RET_LABEL21;
-RET_LABEL21:(void)0;
+var29 = 1;
+{
+{ /* Inline kernel#Int#- (var_l,var29) on <var_l:Int> */
+/* Covariant cast for argument 0 (i) <var29:Int> isa OTHER */
+/* <var29:Int> isa OTHER */
+var32 = 1; /* easy <var29:Int> isa OTHER*/
+if (unlikely(!var32)) {
+var_class_name35 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name35);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 377);
+show_backtrace(1);
+}
+var36 = var_l - var29;
+var30 = var36;
+goto RET_LABEL31;
+RET_LABEL31:(void)0;
+}
 }
-self->attrs[COLOR_array__AbstractArrayRead___length].l = var20; /* _length on <self:AbstractArray[nullable Object]> */
+self->attrs[COLOR_array__AbstractArrayRead___length].l = var30; /* _length on <self:AbstractArray[nullable Object]> */
 var = var_r;
 goto RET_LABEL;
 RET_LABEL:;
@@ -1132,28 +1153,43 @@ int cltype;
 int idtype;
 const struct type* type_struct;
 short int is_nullable;
+const char* var_class_name;
 val* var_item /* var item: nullable Object */;
 long var1 /* : Int */;
-long var2 /* : Int */;
 long var3 /* : Int */;
+long var4 /* : Int */;
 long var5 /* : Int */;
-long var_i /* var i: Int */;
-long var6 /* : Int */;
 short int var7 /* : Bool */;
-short int var9 /* : Bool */;
-int cltype10;
-int idtype11;
-short int var12 /* : Bool */;
-long var13 /* : Int */;
-long var14 /* : Int */;
-long var16 /* : Int */;
-val* var17 /* : nullable Object */;
-long var18 /* : Int */;
-long var19 /* : Int */;
+int cltype8;
+int idtype9;
+const char* var_class_name10;
+long var11 /* : Int */;
+long var_i /* var i: Int */;
+long var12 /* : Int */;
+short int var13 /* : Bool */;
+short int var15 /* : Bool */;
+int cltype16;
+int idtype17;
+const char* var_class_name18;
+short int var19 /* : Bool */;
+long var20 /* : Int */;
 long var21 /* : Int */;
-long var22 /* : Int */;
-/* Covariant cast for argument 0 (item) <p0:nullable Object> isa Sequence#0 */
-/* <p0:nullable Object> isa Sequence#0 */
+short int var23 /* : Bool */;
+int cltype24;
+int idtype25;
+const char* var_class_name26;
+long var27 /* : Int */;
+val* var28 /* : nullable Object */;
+long var29 /* : Int */;
+long var30 /* : Int */;
+short int var32 /* : Bool */;
+int cltype33;
+int idtype34;
+const char* var_class_name35;
+long var36 /* : Int */;
+long var37 /* : Int */;
+/* Covariant cast for argument 0 (item) <p0:nullable Object> isa E */
+/* <p0:nullable Object> isa E */
 type_struct = self->type->resolution_table->types[COLOR_abstract_collection__Sequence_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -1167,63 +1203,116 @@ var = 0;
 var = p0->type->type_table[cltype] == idtype;
 }
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 176);
-exit(1);
+if (unlikely(!var)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "E", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 171);
+show_backtrace(1);
 }
 var_item = p0;
-var1 = ((long (*)(val*))(self->class->vft[COLOR_abstract_collection__Collection__length]))(self) /* length on <self:AbstractArray[nullable Object]>*/;
-var2 = 1;
-{ /* Inline kernel#Int#- (var1,var2) */
-var5 = var1 - var2;
-var3 = var5;
-goto RET_LABEL4;
-RET_LABEL4:(void)0;
+{
+{ /* Inline array#AbstractArrayRead#length (self) on <self:AbstractArray[nullable Object]> */
+var3 = self->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <self:AbstractArray[nullable Object]> */
+var1 = var3;
+RET_LABEL2:(void)0;
+}
+}
+var4 = 1;
+{
+{ /* Inline kernel#Int#- (var1,var4) on <var1:Int> */
+/* Covariant cast for argument 0 (i) <var4:Int> isa OTHER */
+/* <var4:Int> isa OTHER */
+var7 = 1; /* easy <var4:Int> isa OTHER*/
+if (unlikely(!var7)) {
+var_class_name10 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name10);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 377);
+show_backtrace(1);
+}
+var11 = var1 - var4;
+var5 = var11;
+goto RET_LABEL6;
+RET_LABEL6:(void)0;
 }
-var_i = var3;
+}
+var_i = var5;
 for(;;) {
-var6 = 0;
-{ /* Inline kernel#Int#> (var_i,var6) */
-/* Covariant cast for argument 0 (i) <var6:Int> isa OTHER */
-/* <var6:Int> isa OTHER */
-var9 = 1; /* easy <var6:Int> isa OTHER*/
-if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 259);
-exit(1);
+var12 = 0;
+{
+{ /* Inline kernel#Int#>= (var_i,var12) on <var_i:Int> */
+/* Covariant cast for argument 0 (i) <var12:Int> isa OTHER */
+/* <var12:Int> isa OTHER */
+var15 = 1; /* easy <var12:Int> isa OTHER*/
+if (unlikely(!var15)) {
+var_class_name18 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name18);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 372);
+show_backtrace(1);
+}
+var19 = var_i >= var12;
+var13 = var19;
+goto RET_LABEL14;
+RET_LABEL14:(void)0;
+}
+}
+if (var13){
+var20 = 1;
+{
+{ /* Inline kernel#Int#+ (var_i,var20) on <var_i:Int> */
+/* Covariant cast for argument 0 (i) <var20:Int> isa OTHER */
+/* <var20:Int> isa OTHER */
+var23 = 1; /* easy <var20:Int> isa OTHER*/
+if (unlikely(!var23)) {
+var_class_name26 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name26);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 374);
+show_backtrace(1);
+}
+var27 = var_i + var20;
+var21 = var27;
+goto RET_LABEL22;
+RET_LABEL22:(void)0;
 }
-var12 = var_i > var6;
-var7 = var12;
-goto RET_LABEL8;
-RET_LABEL8:(void)0;
 }
-if (!var7) break;
-var13 = 1;
-{ /* Inline kernel#Int#+ (var_i,var13) */
-var16 = var_i + var13;
-var14 = var16;
-goto RET_LABEL15;
-RET_LABEL15:(void)0;
+{
+var28 = array__Array___91d_93d(self, var_i);
 }
-var17 = ((val* (*)(val*, long))(self->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(self, var_i) /* [] on <self:AbstractArray[nullable Object]>*/;
-((void (*)(val*, long, val*))(self->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(self, var14, var17) /* []= on <self:AbstractArray[nullable Object]>*/;
-var18 = 1;
-{ /* Inline kernel#Int#- (var_i,var18) */
-var21 = var_i - var18;
-var19 = var21;
-goto RET_LABEL20;
-RET_LABEL20:(void)0;
+{
+array__Array___91d_93d_61d(self, var21, var28); /* Direct call array#Array#[]= on <self:AbstractArray[nullable Object]>*/
+}
+var29 = 1;
+{
+{ /* Inline kernel#Int#- (var_i,var29) on <var_i:Int> */
+/* Covariant cast for argument 0 (i) <var29:Int> isa OTHER */
+/* <var29:Int> isa OTHER */
+var32 = 1; /* easy <var29:Int> isa OTHER*/
+if (unlikely(!var32)) {
+var_class_name35 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name35);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 377);
+show_backtrace(1);
+}
+var36 = var_i - var29;
+var30 = var36;
+goto RET_LABEL31;
+RET_LABEL31:(void)0;
+}
+}
+var_i = var30;
+} else {
+goto BREAK_label;
 }
-var_i = var19;
-CONTINUE_label: (void)0;
 }
 BREAK_label: (void)0;
-var22 = 0;
-((void (*)(val*, long, val*))(self->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(self, var22, var_item) /* []= on <self:AbstractArray[nullable Object]>*/;
+var37 = 0;
+{
+array__Array___91d_93d_61d(self, var37, var_item); /* Direct call array#Array#[]= on <self:AbstractArray[nullable Object]>*/
+}
 RET_LABEL:;
 }
 /* method array#AbstractArray#unshift for (self: Object, nullable Object) */
 void VIRTUAL_array__AbstractArray__unshift(val* self, val* p0) {
-array__AbstractArray__unshift(self, p0);
+array__AbstractArray__unshift(self, p0); /* Direct call array#AbstractArray#unshift on <self:Object(AbstractArray[nullable Object])>*/
 RET_LABEL:;
 }
 /* method array#AbstractArray#insert for (self: AbstractArray[nullable Object], nullable Object, Int) */
@@ -1233,20 +1322,35 @@ int cltype;
 int idtype;
 const struct type* type_struct;
 short int is_nullable;
+const char* var_class_name;
 val* var_item /* var item: nullable Object */;
 long var_pos /* var pos: Int */;
 long var1 /* : Int */;
-long var2 /* : Int */;
 long var3 /* : Int */;
+long var4 /* : Int */;
 long var5 /* : Int */;
-long var6 /* : Int */;
-long var7 /* : Int */;
-long var9 /* : Int */;
-long var10 /* : Int */;
+short int var7 /* : Bool */;
+int cltype8;
+int idtype9;
+const char* var_class_name10;
 long var11 /* : Int */;
-long var13 /* : Int */;
-/* Covariant cast for argument 0 (item) <p0:nullable Object> isa AbstractArray#0 */
-/* <p0:nullable Object> isa AbstractArray#0 */
+long var12 /* : Int */;
+long var14 /* : Int */;
+long var15 /* : Int */;
+short int var17 /* : Bool */;
+int cltype18;
+int idtype19;
+const char* var_class_name20;
+long var21 /* : Int */;
+long var22 /* : Int */;
+long var23 /* : Int */;
+short int var25 /* : Bool */;
+int cltype26;
+int idtype27;
+const char* var_class_name28;
+long var29 /* : Int */;
+/* Covariant cast for argument 0 (item) <p0:nullable Object> isa E */
+/* <p0:nullable Object> isa E */
 type_struct = self->type->resolution_table->types[COLOR_array__AbstractArray_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -1260,80 +1364,359 @@ var = 0;
 var = p0->type->type_table[cltype] == idtype;
 }
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 186);
-exit(1);
+if (unlikely(!var)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "E", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 181);
+show_backtrace(1);
 }
 var_item = p0;
 var_pos = p1;
-var1 = ((long (*)(val*))(self->class->vft[COLOR_abstract_collection__Collection__length]))(self) /* length on <self:AbstractArray[nullable Object]>*/;
-var2 = 1;
-{ /* Inline kernel#Int#+ (var1,var2) */
-var5 = var1 + var2;
-var3 = var5;
-goto RET_LABEL4;
-RET_LABEL4:(void)0;
+{
+{ /* Inline array#AbstractArrayRead#length (self) on <self:AbstractArray[nullable Object]> */
+var3 = self->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <self:AbstractArray[nullable Object]> */
+var1 = var3;
+RET_LABEL2:(void)0;
 }
-((void (*)(val*, long))(self->class->vft[COLOR_array__AbstractArray__enlarge]))(self, var3) /* enlarge on <self:AbstractArray[nullable Object]>*/;
-var6 = ((long (*)(val*))(self->class->vft[COLOR_abstract_collection__Collection__length]))(self) /* length on <self:AbstractArray[nullable Object]>*/;
-{ /* Inline kernel#Int#- (var6,var_pos) */
-var9 = var6 - var_pos;
-var7 = var9;
-goto RET_LABEL8;
-RET_LABEL8:(void)0;
 }
-var10 = 1;
-{ /* Inline kernel#Int#+ (var_pos,var10) */
-var13 = var_pos + var10;
-var11 = var13;
-goto RET_LABEL12;
-RET_LABEL12:(void)0;
+var4 = 1;
+{
+{ /* Inline kernel#Int#+ (var1,var4) on <var1:Int> */
+/* Covariant cast for argument 0 (i) <var4:Int> isa OTHER */
+/* <var4:Int> isa OTHER */
+var7 = 1; /* easy <var4:Int> isa OTHER*/
+if (unlikely(!var7)) {
+var_class_name10 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name10);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 374);
+show_backtrace(1);
+}
+var11 = var1 + var4;
+var5 = var11;
+goto RET_LABEL6;
+RET_LABEL6:(void)0;
+}
+}
+{
+array__Array__enlarge(self, var5); /* Direct call array#Array#enlarge on <self:AbstractArray[nullable Object]>*/
+}
+{
+{ /* Inline array#AbstractArrayRead#length (self) on <self:AbstractArray[nullable Object]> */
+var14 = self->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <self:AbstractArray[nullable Object]> */
+var12 = var14;
+RET_LABEL13:(void)0;
+}
+}
+{
+{ /* Inline kernel#Int#- (var12,var_pos) on <var12:Int> */
+/* Covariant cast for argument 0 (i) <var_pos:Int> isa OTHER */
+/* <var_pos:Int> isa OTHER */
+var17 = 1; /* easy <var_pos:Int> isa OTHER*/
+if (unlikely(!var17)) {
+var_class_name20 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name20);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 377);
+show_backtrace(1);
+}
+var21 = var12 - var_pos;
+var15 = var21;
+goto RET_LABEL16;
+RET_LABEL16:(void)0;
+}
+}
+var22 = 1;
+{
+{ /* Inline kernel#Int#+ (var_pos,var22) on <var_pos:Int> */
+/* Covariant cast for argument 0 (i) <var22:Int> isa OTHER */
+/* <var22:Int> isa OTHER */
+var25 = 1; /* easy <var22:Int> isa OTHER*/
+if (unlikely(!var25)) {
+var_class_name28 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name28);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 374);
+show_backtrace(1);
+}
+var29 = var_pos + var22;
+var23 = var29;
+goto RET_LABEL24;
+RET_LABEL24:(void)0;
+}
+}
+{
+array__AbstractArrayRead__copy_to(self, var_pos, var15, self, var23); /* Direct call array#AbstractArrayRead#copy_to on <self:AbstractArray[nullable Object]>*/
+}
+{
+array__Array___91d_93d_61d(self, var_pos, var_item); /* Direct call array#Array#[]= on <self:AbstractArray[nullable Object]>*/
 }
-((void (*)(val*, long, long, val*, long))(self->class->vft[COLOR_array__AbstractArrayRead__copy_to]))(self, var_pos, var7, self, var11) /* copy_to on <self:AbstractArray[nullable Object]>*/;
-((void (*)(val*, long, val*))(self->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(self, var_pos, var_item) /* []= on <self:AbstractArray[nullable Object]>*/;
 RET_LABEL:;
 }
 /* method array#AbstractArray#insert for (self: Object, nullable Object, Int) */
 void VIRTUAL_array__AbstractArray__insert(val* self, val* p0, long p1) {
-array__AbstractArray__insert(self, p0, p1);
+array__AbstractArray__insert(self, p0, p1); /* Direct call array#AbstractArray#insert on <self:Object(AbstractArray[nullable Object])>*/
 RET_LABEL:;
 }
-/* method array#AbstractArray#add for (self: AbstractArray[nullable Object], nullable Object) */
-void array__AbstractArray__add(val* self, val* p0) {
+/* method array#AbstractArray#insert_all for (self: AbstractArray[nullable Object], Collection[nullable Object], Int) */
+void array__AbstractArray__insert_all(val* self, val* p0, long p1) {
 short int var /* : Bool */;
 int cltype;
 int idtype;
 const struct type* type_struct;
-short int is_nullable;
-val* var_item /* var item: nullable Object */;
+const char* var_class_name;
+val* var_coll /* var coll: Collection[nullable Object] */;
+long var_pos /* var pos: Int */;
 long var1 /* : Int */;
-/* Covariant cast for argument 0 (item) <p0:nullable Object> isa SimpleCollection#0 */
-/* <p0:nullable Object> isa SimpleCollection#0 */
-type_struct = self->type->resolution_table->types[COLOR_abstract_collection__SimpleCollection_FT0];
+long var_l /* var l: Int */;
+long var2 /* : Int */;
+short int var3 /* : Bool */;
+short int var4 /* : Bool */;
+short int var6 /* : Bool */;
+long var7 /* : Int */;
+long var9 /* : Int */;
+long var10 /* : Int */;
+short int var12 /* : Bool */;
+int cltype13;
+int idtype14;
+const char* var_class_name15;
+long var16 /* : Int */;
+val* var_ /* var : AbstractArray[nullable Object] */;
+long var17 /* : Int */;
+long var18 /* : Int */;
+short int var20 /* : Bool */;
+int cltype21;
+int idtype22;
+const char* var_class_name23;
+long var24 /* : Int */;
+long var25 /* : Int */;
+long var27 /* : Int */;
+long var28 /* : Int */;
+short int var30 /* : Bool */;
+int cltype31;
+int idtype32;
+const char* var_class_name33;
+long var34 /* : Int */;
+long var35 /* : Int */;
+short int var37 /* : Bool */;
+int cltype38;
+int idtype39;
+const char* var_class_name40;
+long var41 /* : Int */;
+long var42 /* : Int */;
+short int var44 /* : Bool */;
+int cltype45;
+int idtype46;
+const char* var_class_name47;
+long var48 /* : Int */;
+val* var_49 /* var : Collection[nullable Object] */;
+val* var50 /* : Iterator[nullable Object] */;
+val* var_51 /* var : Iterator[nullable Object] */;
+short int var52 /* : Bool */;
+val* var53 /* : nullable Object */;
+val* var_c /* var c: nullable Object */;
+long var54 /* : Int */;
+long var55 /* : Int */;
+short int var57 /* : Bool */;
+int cltype58;
+int idtype59;
+const char* var_class_name60;
+long var61 /* : Int */;
+/* Covariant cast for argument 0 (coll) <p0:Collection[nullable Object]> isa Collection[E] */
+/* <p0:Collection[nullable Object]> isa Collection[E] */
+type_struct = self->type->resolution_table->types[COLOR_abstract_collection__Collectionabstract_collection__Sequence_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
-is_nullable = type_struct->is_nullable;
-if(p0 == NULL) {
-var = is_nullable;
-} else {
 if(cltype >= p0->type->table_size) {
 var = 0;
 } else {
 var = p0->type->type_table[cltype] == idtype;
 }
+if (unlikely(!var)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "Collection[E]", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 188);
+show_backtrace(1);
+}
+var_coll = p0;
+var_pos = p1;
+{
+var1 = ((long (*)(val*))(var_coll->class->vft[COLOR_abstract_collection__Collection__length]))(var_coll) /* length on <var_coll:Collection[nullable Object]>*/;
+}
+var_l = var1;
+var2 = 0;
+{
+{ /* Inline kernel#Int#== (var_l,var2) on <var_l:Int> */
+var6 = var_l == var2;
+var4 = var6;
+goto RET_LABEL5;
+RET_LABEL5:(void)0;
+}
+var3 = var4;
+}
+if (var3){
+goto RET_LABEL;
+} else {
+}
+{
+{ /* Inline array#AbstractArrayRead#length (self) on <self:AbstractArray[nullable Object]> */
+var9 = self->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <self:AbstractArray[nullable Object]> */
+var7 = var9;
+RET_LABEL8:(void)0;
+}
+}
+{
+{ /* Inline kernel#Int#+ (var7,var_l) on <var7:Int> */
+/* Covariant cast for argument 0 (i) <var_l:Int> isa OTHER */
+/* <var_l:Int> isa OTHER */
+var12 = 1; /* easy <var_l:Int> isa OTHER*/
+if (unlikely(!var12)) {
+var_class_name15 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name15);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 374);
+show_backtrace(1);
+}
+var16 = var7 + var_l;
+var10 = var16;
+goto RET_LABEL11;
+RET_LABEL11:(void)0;
+}
+}
+{
+array__Array__enlarge(self, var10); /* Direct call array#Array#enlarge on <self:AbstractArray[nullable Object]>*/
+}
+var_ = self;
+var17 = var_->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <var_:AbstractArray[nullable Object]> */
+{
+{ /* Inline kernel#Int#+ (var17,var_l) on <var17:Int> */
+/* Covariant cast for argument 0 (i) <var_l:Int> isa OTHER */
+/* <var_l:Int> isa OTHER */
+var20 = 1; /* easy <var_l:Int> isa OTHER*/
+if (unlikely(!var20)) {
+var_class_name23 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name23);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 374);
+show_backtrace(1);
+}
+var24 = var17 + var_l;
+var18 = var24;
+goto RET_LABEL19;
+RET_LABEL19:(void)0;
+}
+}
+var_->attrs[COLOR_array__AbstractArrayRead___length].l = var18; /* _length on <var_:AbstractArray[nullable Object]> */
+{
+{ /* Inline array#AbstractArrayRead#length (self) on <self:AbstractArray[nullable Object]> */
+var27 = self->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <self:AbstractArray[nullable Object]> */
+var25 = var27;
+RET_LABEL26:(void)0;
+}
+}
+{
+{ /* Inline kernel#Int#- (var25,var_pos) on <var25:Int> */
+/* Covariant cast for argument 0 (i) <var_pos:Int> isa OTHER */
+/* <var_pos:Int> isa OTHER */
+var30 = 1; /* easy <var_pos:Int> isa OTHER*/
+if (unlikely(!var30)) {
+var_class_name33 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name33);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 377);
+show_backtrace(1);
+}
+var34 = var25 - var_pos;
+var28 = var34;
+goto RET_LABEL29;
+RET_LABEL29:(void)0;
+}
+}
+{
+{ /* Inline kernel#Int#- (var28,var_l) on <var28:Int> */
+/* Covariant cast for argument 0 (i) <var_l:Int> isa OTHER */
+/* <var_l:Int> isa OTHER */
+var37 = 1; /* easy <var_l:Int> isa OTHER*/
+if (unlikely(!var37)) {
+var_class_name40 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name40);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 377);
+show_backtrace(1);
+}
+var41 = var28 - var_l;
+var35 = var41;
+goto RET_LABEL36;
+RET_LABEL36:(void)0;
+}
+}
+{
+{ /* Inline kernel#Int#+ (var_pos,var_l) on <var_pos:Int> */
+/* Covariant cast for argument 0 (i) <var_l:Int> isa OTHER */
+/* <var_l:Int> isa OTHER */
+var44 = 1; /* easy <var_l:Int> isa OTHER*/
+if (unlikely(!var44)) {
+var_class_name47 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name47);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 374);
+show_backtrace(1);
+}
+var48 = var_pos + var_l;
+var42 = var48;
+goto RET_LABEL43;
+RET_LABEL43:(void)0;
+}
+}
+{
+array__AbstractArrayRead__copy_to(self, var_pos, var35, self, var42); /* Direct call array#AbstractArrayRead#copy_to on <self:AbstractArray[nullable Object]>*/
+}
+var_49 = var_coll;
+{
+var50 = ((val* (*)(val*))(var_49->class->vft[COLOR_abstract_collection__Collection__iterator]))(var_49) /* iterator on <var_49:Collection[nullable Object]>*/;
+}
+var_51 = var50;
+for(;;) {
+{
+var52 = ((short int (*)(val*))(var_51->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(var_51) /* is_ok on <var_51:Iterator[nullable Object]>*/;
+}
+if (var52){
+{
+var53 = ((val* (*)(val*))(var_51->class->vft[COLOR_abstract_collection__Iterator__item]))(var_51) /* item on <var_51:Iterator[nullable Object]>*/;
+}
+var_c = var53;
+{
+array__Array___91d_93d_61d(self, var_pos, var_c); /* Direct call array#Array#[]= on <self:AbstractArray[nullable Object]>*/
+}
+var54 = 1;
+{
+{ /* Inline kernel#Int#+ (var_pos,var54) on <var_pos:Int> */
+/* Covariant cast for argument 0 (i) <var54:Int> isa OTHER */
+/* <var54:Int> isa OTHER */
+var57 = 1; /* easy <var54:Int> isa OTHER*/
+if (unlikely(!var57)) {
+var_class_name60 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name60);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 374);
+show_backtrace(1);
+}
+var61 = var_pos + var54;
+var55 = var61;
+goto RET_LABEL56;
+RET_LABEL56:(void)0;
+}
+}
+var_pos = var55;
+{
+((void (*)(val*))(var_51->class->vft[COLOR_abstract_collection__Iterator__next]))(var_51) /* next on <var_51:Iterator[nullable Object]>*/;
+}
+} else {
+goto BREAK_label;
+}
+}
+BREAK_label: (void)0;
+{
+{ /* Inline abstract_collection#Iterator#finish (var_51) on <var_51:Iterator[nullable Object]> */
+RET_LABEL62:(void)0;
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 198);
-exit(1);
 }
-var_item = p0;
-var1 = ((long (*)(val*))(self->class->vft[COLOR_abstract_collection__Collection__length]))(self) /* length on <self:AbstractArray[nullable Object]>*/;
-((void (*)(val*, long, val*))(self->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(self, var1, var_item) /* []= on <self:AbstractArray[nullable Object]>*/;
 RET_LABEL:;
 }
-/* method array#AbstractArray#add for (self: Object, nullable Object) */
-void VIRTUAL_array__AbstractArray__add(val* self, val* p0) {
-array__AbstractArray__add(self, p0);
+/* method array#AbstractArray#insert_all for (self: Object, Collection[nullable Object], Int) */
+void VIRTUAL_array__AbstractArray__insert_all(val* self, val* p0, long p1) {
+array__AbstractArray__insert_all(self, p0, p1); /* Direct call array#AbstractArray#insert_all on <self:Object(AbstractArray[nullable Object])>*/
 RET_LABEL:;
 }
 /* method array#AbstractArray#clear for (self: AbstractArray[nullable Object]) */
@@ -1345,7 +1728,7 @@ RET_LABEL:;
 }
 /* method array#AbstractArray#clear for (self: Object) */
 void VIRTUAL_array__AbstractArray__clear(val* self) {
-array__AbstractArray__clear(self);
+array__AbstractArray__clear(self); /* Direct call array#AbstractArray#clear on <self:Object(AbstractArray[nullable Object])>*/
 RET_LABEL:;
 }
 /* method array#AbstractArray#remove for (self: AbstractArray[nullable Object], nullable Object) */
@@ -1355,10 +1738,11 @@ int cltype;
 int idtype;
 const struct type* type_struct;
 short int is_nullable;
+const char* var_class_name;
 val* var_item /* var item: nullable Object */;
 long var1 /* : Int */;
-/* Covariant cast for argument 0 (item) <p0:nullable Object> isa RemovableCollection#0 */
-/* <p0:nullable Object> isa RemovableCollection#0 */
+/* Covariant cast for argument 0 (item) <p0:nullable Object> isa E */
+/* <p0:nullable Object> isa E */
 type_struct = self->type->resolution_table->types[COLOR_abstract_collection__RemovableCollection_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -1372,309 +1756,246 @@ var = 0;
 var = p0->type->type_table[cltype] == idtype;
 }
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 202);
-exit(1);
+if (unlikely(!var)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "E", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 205);
+show_backtrace(1);
 }
 var_item = p0;
-var1 = ((long (*)(val*, val*))(self->class->vft[COLOR_abstract_collection__SequenceRead__index_of]))(self, var_item) /* index_of on <self:AbstractArray[nullable Object]>*/;
-((void (*)(val*, long))(self->class->vft[COLOR_abstract_collection__Sequence__remove_at]))(self, var1) /* remove_at on <self:AbstractArray[nullable Object]>*/;
-RET_LABEL:;
-}
-/* method array#AbstractArray#remove for (self: Object, nullable Object) */
-void VIRTUAL_array__AbstractArray__remove(val* self, val* p0) {
-array__AbstractArray__remove(self, p0);
-RET_LABEL:;
-}
-/* method array#AbstractArray#remove_all for (self: AbstractArray[nullable Object], nullable Object) */
-void array__AbstractArray__remove_all(val* self, val* p0) {
-short int var /* : Bool */;
-int cltype;
-int idtype;
-const struct type* type_struct;
-short int is_nullable;
-val* var_item /* var item: nullable Object */;
-long var1 /* : Int */;
-long var_i /* var i: Int */;
-long var2 /* : Int */;
-short int var3 /* : Bool */;
-short int var5 /* : Bool */;
-int cltype6;
-int idtype7;
-short int var8 /* : Bool */;
-long var9 /* : Int */;
-/* Covariant cast for argument 0 (item) <p0:nullable Object> isa RemovableCollection#0 */
-/* <p0:nullable Object> isa RemovableCollection#0 */
-type_struct = self->type->resolution_table->types[COLOR_abstract_collection__RemovableCollection_FT0];
-cltype = type_struct->color;
-idtype = type_struct->id;
-is_nullable = type_struct->is_nullable;
-if(p0 == NULL) {
-var = is_nullable;
-} else {
-if(cltype >= p0->type->table_size) {
-var = 0;
-} else {
-var = p0->type->type_table[cltype] == idtype;
-}
+{
+var1 = array__AbstractArrayRead__index_of(self, var_item);
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 204);
-exit(1);
+{
+array__AbstractArray__remove_at(self, var1); /* Direct call array#AbstractArray#remove_at on <self:AbstractArray[nullable Object]>*/
 }
-var_item = p0;
-var1 = ((long (*)(val*, val*))(self->class->vft[COLOR_abstract_collection__SequenceRead__index_of]))(self, var_item) /* index_of on <self:AbstractArray[nullable Object]>*/;
-var_i = var1;
-for(;;) {
-var2 = 0;
-{ /* Inline kernel#Int#>= (var_i,var2) */
-/* Covariant cast for argument 0 (i) <var2:Int> isa OTHER */
-/* <var2:Int> isa OTHER */
-var5 = 1; /* easy <var2:Int> isa OTHER*/
-if (!var5) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 258);
-exit(1);
-}
-var8 = var_i >= var2;
-var3 = var8;
-goto RET_LABEL4;
-RET_LABEL4:(void)0;
-}
-if (!var3) break;
-((void (*)(val*, long))(self->class->vft[COLOR_abstract_collection__Sequence__remove_at]))(self, var_i) /* remove_at on <self:AbstractArray[nullable Object]>*/;
-var9 = ((long (*)(val*, val*, long))(self->class->vft[COLOR_array__AbstractArrayRead__index_of_from]))(self, var_item, var_i) /* index_of_from on <self:AbstractArray[nullable Object]>*/;
-var_i = var9;
-CONTINUE_label: (void)0;
-}
-BREAK_label: (void)0;
 RET_LABEL:;
 }
-/* method array#AbstractArray#remove_all for (self: Object, nullable Object) */
-void VIRTUAL_array__AbstractArray__remove_all(val* self, val* p0) {
-array__AbstractArray__remove_all(self, p0);
+/* method array#AbstractArray#remove for (self: Object, nullable Object) */
+void VIRTUAL_array__AbstractArray__remove(val* self, val* p0) {
+array__AbstractArray__remove(self, p0); /* Direct call array#AbstractArray#remove on <self:Object(AbstractArray[nullable Object])>*/
 RET_LABEL:;
 }
 /* method array#AbstractArray#remove_at for (self: AbstractArray[nullable Object], Int) */
 void array__AbstractArray__remove_at(val* self, long p0) {
 long var_i /* var i: Int */;
 long var /* : Int */;
-long var_l /* var l: Int */;
-short int var1 /* : Bool */;
 long var2 /* : Int */;
+long var_l /* var l: Int */;
 short int var3 /* : Bool */;
+long var4 /* : Int */;
 short int var5 /* : Bool */;
+short int var7 /* : Bool */;
 int cltype;
 int idtype;
-short int var6 /* : Bool */;
+const char* var_class_name;
+short int var8 /* : Bool */;
 short int var_ /* var : Bool */;
-short int var7 /* : Bool */;
 short int var9 /* : Bool */;
-int cltype10;
-int idtype11;
-short int var12 /* : Bool */;
-long var13 /* : Int */;
-long var14 /* : Int */;
+short int var11 /* : Bool */;
+int cltype12;
+int idtype13;
+const char* var_class_name14;
+short int var15 /* : Bool */;
 long var16 /* : Int */;
-long var_j /* var j: Int */;
-short int var17 /* : Bool */;
+long var17 /* : Int */;
 short int var19 /* : Bool */;
 int cltype20;
 int idtype21;
-short int var22 /* : Bool */;
+const char* var_class_name22;
 long var23 /* : Int */;
-long var24 /* : Int */;
-long var26 /* : Int */;
-val* var27 /* : nullable Object */;
-long var28 /* : Int */;
-long var29 /* : Int */;
+long var_j /* var j: Int */;
+short int var24 /* : Bool */;
+short int var26 /* : Bool */;
+int cltype27;
+int idtype28;
+const char* var_class_name29;
+short int var30 /* : Bool */;
 long var31 /* : Int */;
 long var32 /* : Int */;
-long var33 /* : Int */;
-long var35 /* : Int */;
+short int var34 /* : Bool */;
+int cltype35;
+int idtype36;
+const char* var_class_name37;
+long var38 /* : Int */;
+val* var39 /* : nullable Object */;
+long var40 /* : Int */;
+long var41 /* : Int */;
+short int var43 /* : Bool */;
+int cltype44;
+int idtype45;
+const char* var_class_name46;
+long var47 /* : Int */;
+long var48 /* : Int */;
+long var49 /* : Int */;
+short int var51 /* : Bool */;
+int cltype52;
+int idtype53;
+const char* var_class_name54;
+long var55 /* : Int */;
 var_i = p0;
-var = ((long (*)(val*))(self->class->vft[COLOR_abstract_collection__Collection__length]))(self) /* length on <self:AbstractArray[nullable Object]>*/;
+{
+{ /* Inline array#AbstractArrayRead#length (self) on <self:AbstractArray[nullable Object]> */
+var2 = self->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <self:AbstractArray[nullable Object]> */
+var = var2;
+RET_LABEL1:(void)0;
+}
+}
 var_l = var;
-var2 = 0;
-{ /* Inline kernel#Int#>= (var_i,var2) */
-/* Covariant cast for argument 0 (i) <var2:Int> isa OTHER */
-/* <var2:Int> isa OTHER */
-var5 = 1; /* easy <var2:Int> isa OTHER*/
-if (!var5) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 258);
-exit(1);
+var4 = 0;
+{
+{ /* Inline kernel#Int#>= (var_i,var4) on <var_i:Int> */
+/* Covariant cast for argument 0 (i) <var4:Int> isa OTHER */
+/* <var4:Int> isa OTHER */
+var7 = 1; /* easy <var4:Int> isa OTHER*/
+if (unlikely(!var7)) {
+var_class_name = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 372);
+show_backtrace(1);
+}
+var8 = var_i >= var4;
+var5 = var8;
+goto RET_LABEL6;
+RET_LABEL6:(void)0;
 }
-var6 = var_i >= var2;
-var3 = var6;
-goto RET_LABEL4;
-RET_LABEL4:(void)0;
 }
-var_ = var3;
-if (var3){
-{ /* Inline kernel#Int#< (var_i,var_l) */
+var_ = var5;
+if (var5){
+{
+{ /* Inline kernel#Int#< (var_i,var_l) on <var_i:Int> */
 /* Covariant cast for argument 0 (i) <var_l:Int> isa OTHER */
 /* <var_l:Int> isa OTHER */
-var9 = 1; /* easy <var_l:Int> isa OTHER*/
-if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 257);
-exit(1);
+var11 = 1; /* easy <var_l:Int> isa OTHER*/
+if (unlikely(!var11)) {
+var_class_name14 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name14);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 371);
+show_backtrace(1);
+}
+var15 = var_i < var_l;
+var9 = var15;
+goto RET_LABEL10;
+RET_LABEL10:(void)0;
 }
-var12 = var_i < var_l;
-var7 = var12;
-goto RET_LABEL8;
-RET_LABEL8:(void)0;
 }
-var1 = var7;
+var3 = var9;
 } else {
-var1 = var_;
+var3 = var_;
 }
-if (var1){
-var13 = 1;
-{ /* Inline kernel#Int#+ (var_i,var13) */
-var16 = var_i + var13;
-var14 = var16;
-goto RET_LABEL15;
-RET_LABEL15:(void)0;
+if (var3){
+var16 = 1;
+{
+{ /* Inline kernel#Int#+ (var_i,var16) on <var_i:Int> */
+/* Covariant cast for argument 0 (i) <var16:Int> isa OTHER */
+/* <var16:Int> isa OTHER */
+var19 = 1; /* easy <var16:Int> isa OTHER*/
+if (unlikely(!var19)) {
+var_class_name22 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name22);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 374);
+show_backtrace(1);
+}
+var23 = var_i + var16;
+var17 = var23;
+goto RET_LABEL18;
+RET_LABEL18:(void)0;
 }
-var_j = var14;
+}
+var_j = var17;
 for(;;) {
-{ /* Inline kernel#Int#< (var_j,var_l) */
+{
+{ /* Inline kernel#Int#< (var_j,var_l) on <var_j:Int> */
 /* Covariant cast for argument 0 (i) <var_l:Int> isa OTHER */
 /* <var_l:Int> isa OTHER */
-var19 = 1; /* easy <var_l:Int> isa OTHER*/
-if (!var19) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 257);
-exit(1);
-}
-var22 = var_j < var_l;
-var17 = var22;
-goto RET_LABEL18;
-RET_LABEL18:(void)0;
-}
-if (!var17) break;
-var23 = 1;
-{ /* Inline kernel#Int#- (var_j,var23) */
-var26 = var_j - var23;
-var24 = var26;
+var26 = 1; /* easy <var_l:Int> isa OTHER*/
+if (unlikely(!var26)) {
+var_class_name29 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name29);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 371);
+show_backtrace(1);
+}
+var30 = var_j < var_l;
+var24 = var30;
 goto RET_LABEL25;
 RET_LABEL25:(void)0;
 }
-var27 = ((val* (*)(val*, long))(self->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(self, var_j) /* [] on <self:AbstractArray[nullable Object]>*/;
-((void (*)(val*, long, val*))(self->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(self, var24, var27) /* []= on <self:AbstractArray[nullable Object]>*/;
-var28 = 1;
-{ /* Inline kernel#Int#+ (var_j,var28) */
-var31 = var_j + var28;
-var29 = var31;
-goto RET_LABEL30;
-RET_LABEL30:(void)0;
-}
-var_j = var29;
-CONTINUE_label: (void)0;
-}
-BREAK_label: (void)0;
-var32 = 1;
-{ /* Inline kernel#Int#- (var_l,var32) */
-var35 = var_l - var32;
-var33 = var35;
-goto RET_LABEL34;
-RET_LABEL34:(void)0;
-}
-self->attrs[COLOR_array__AbstractArrayRead___length].l = var33; /* _length on <self:AbstractArray[nullable Object]> */
-} else {
-}
-RET_LABEL:;
-}
-/* method array#AbstractArray#remove_at for (self: Object, Int) */
-void VIRTUAL_array__AbstractArray__remove_at(val* self, long p0) {
-array__AbstractArray__remove_at(self, p0);
-RET_LABEL:;
-}
-/* method array#AbstractArray#swap_at for (self: AbstractArray[nullable Object], Int, Int) */
-void array__AbstractArray__swap_at(val* self, long p0, long p1) {
-long var_a /* var a: Int */;
-long var_b /* var b: Int */;
-val* var /* : nullable Object */;
-val* var_e /* var e: nullable Object */;
-val* var1 /* : nullable Object */;
-var_a = p0;
-var_b = p1;
-var = ((val* (*)(val*, long))(self->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(self, var_a) /* [] on <self:AbstractArray[nullable Object]>*/;
-var_e = var;
-var1 = ((val* (*)(val*, long))(self->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(self, var_b) /* [] on <self:AbstractArray[nullable Object]>*/;
-((void (*)(val*, long, val*))(self->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(self, var_a, var1) /* []= on <self:AbstractArray[nullable Object]>*/;
-((void (*)(val*, long, val*))(self->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(self, var_b, var_e) /* []= on <self:AbstractArray[nullable Object]>*/;
-RET_LABEL:;
-}
-/* method array#AbstractArray#swap_at for (self: Object, Int, Int) */
-void VIRTUAL_array__AbstractArray__swap_at(val* self, long p0, long p1) {
-array__AbstractArray__swap_at(self, p0, p1);
-RET_LABEL:;
 }
-/* method array#AbstractArray#init for (self: AbstractArray[nullable Object]) */
-void array__AbstractArray__init(val* self) {
-((void (*)(val*))(self->class->vft[COLOR_array__AbstractArrayRead__init]))(self) /* init on <self:AbstractArray[nullable Object]>*/;
-RET_LABEL:;
-}
-/* method array#AbstractArray#init for (self: Object) */
-void VIRTUAL_array__AbstractArray__init(val* self) {
-array__AbstractArray__init(self);
-RET_LABEL:;
+if (var24){
+var31 = 1;
+{
+{ /* Inline kernel#Int#- (var_j,var31) on <var_j:Int> */
+/* Covariant cast for argument 0 (i) <var31:Int> isa OTHER */
+/* <var31:Int> isa OTHER */
+var34 = 1; /* easy <var31:Int> isa OTHER*/
+if (unlikely(!var34)) {
+var_class_name37 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name37);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 377);
+show_backtrace(1);
+}
+var38 = var_j - var31;
+var32 = var38;
+goto RET_LABEL33;
+RET_LABEL33:(void)0;
 }
-/* method array#Array#iterate for (self: Array[nullable Object]) */
-void array__Array__iterate(val* self) {
-long var /* : Int */;
-long var_i /* var i: Int */;
-long var1 /* : Int */;
-long var_l /* var l: Int */;
-val* var2 /* : nullable NativeArray[nullable Object] */;
-val* var_items /* var items: nullable NativeArray[nullable Object] */;
-long var3 /* : Int */;
-short int var4 /* : Bool */;
-short int var6 /* : Bool */;
-int cltype;
-int idtype;
-short int var7 /* : Bool */;
-long var8 /* : Int */;
-long var9 /* : Int */;
-long var11 /* : Int */;
-var = 0;
-var_i = var;
-var1 = self->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <self:Array[nullable Object]> */
-var_l = var1;
-var2 = self->attrs[COLOR_array__Array___items].val; /* _items on <self:Array[nullable Object]> */
-var_items = var2;
-for(;;) {
-var3 = ((long (*)(val*))(self->class->vft[COLOR_abstract_collection__Collection__length]))(self) /* length on <self:Array[nullable Object]>*/;
-{ /* Inline kernel#Int#< (var_i,var3) */
-/* Covariant cast for argument 0 (i) <var3:Int> isa OTHER */
-/* <var3:Int> isa OTHER */
-var6 = 1; /* easy <var3:Int> isa OTHER*/
-if (!var6) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 257);
-exit(1);
 }
-var7 = var_i < var3;
-var4 = var7;
-goto RET_LABEL5;
-RET_LABEL5:(void)0;
+{
+var39 = array__Array___91d_93d(self, var_j);
 }
-if (!var4) break;
-printf("NOT YET IMPLEMENTED AClosureCallExpr:lib/standard/collection/array.nit:260,4--17\n");
-var8 = 1;
-{ /* Inline kernel#Int#+ (var_i,var8) */
-var11 = var_i + var8;
-var9 = var11;
-goto RET_LABEL10;
-RET_LABEL10:(void)0;
+{
+array__Array___91d_93d_61d(self, var32, var39); /* Direct call array#Array#[]= on <self:AbstractArray[nullable Object]>*/
+}
+var40 = 1;
+{
+{ /* Inline kernel#Int#+ (var_j,var40) on <var_j:Int> */
+/* Covariant cast for argument 0 (i) <var40:Int> isa OTHER */
+/* <var40:Int> isa OTHER */
+var43 = 1; /* easy <var40:Int> isa OTHER*/
+if (unlikely(!var43)) {
+var_class_name46 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name46);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 374);
+show_backtrace(1);
+}
+var47 = var_j + var40;
+var41 = var47;
+goto RET_LABEL42;
+RET_LABEL42:(void)0;
+}
+}
+var_j = var41;
+} else {
+goto BREAK_label;
 }
-var_i = var9;
-CONTINUE_label: (void)0;
 }
 BREAK_label: (void)0;
+var48 = 1;
+{
+{ /* Inline kernel#Int#- (var_l,var48) on <var_l:Int> */
+/* Covariant cast for argument 0 (i) <var48:Int> isa OTHER */
+/* <var48:Int> isa OTHER */
+var51 = 1; /* easy <var48:Int> isa OTHER*/
+if (unlikely(!var51)) {
+var_class_name54 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name54);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 377);
+show_backtrace(1);
+}
+var55 = var_l - var48;
+var49 = var55;
+goto RET_LABEL50;
+RET_LABEL50:(void)0;
+}
+}
+self->attrs[COLOR_array__AbstractArrayRead___length].l = var49; /* _length on <self:AbstractArray[nullable Object]> */
+} else {
+}
 RET_LABEL:;
 }
-/* method array#Array#iterate for (self: Object) */
-void VIRTUAL_array__Array__iterate(val* self) {
-array__Array__iterate(self);
+/* method array#AbstractArray#remove_at for (self: Object, Int) */
+void VIRTUAL_array__AbstractArray__remove_at(val* self, long p0) {
+array__AbstractArray__remove_at(self, p0); /* Direct call array#AbstractArray#remove_at on <self:Object(AbstractArray[nullable Object])>*/
 RET_LABEL:;
 }
 /* method array#Array#[] for (self: Array[nullable Object], Int): nullable Object */
@@ -1687,6 +2008,7 @@ short int var3 /* : Bool */;
 short int var5 /* : Bool */;
 int cltype;
 int idtype;
+const char* var_class_name;
 short int var6 /* : Bool */;
 short int var_ /* var : Bool */;
 long var7 /* : Int */;
@@ -1694,56 +2016,73 @@ short int var8 /* : Bool */;
 short int var10 /* : Bool */;
 int cltype11;
 int idtype12;
-short int var13 /* : Bool */;
-val* var14 /* : nullable NativeArray[nullable Object] */;
-val* var15 /* : nullable Object */;
+const char* var_class_name13;
+short int var14 /* : Bool */;
+val* var15 /* : nullable NativeArray[nullable Object] */;
+val* var16 /* : nullable Object */;
+val* var18 /* : nullable Object */;
 var_index = p0;
 var2 = 0;
-{ /* Inline kernel#Int#>= (var_index,var2) */
+{
+{ /* Inline kernel#Int#>= (var_index,var2) on <var_index:Int> */
 /* Covariant cast for argument 0 (i) <var2:Int> isa OTHER */
 /* <var2:Int> isa OTHER */
 var5 = 1; /* easy <var2:Int> isa OTHER*/
-if (!var5) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 258);
-exit(1);
+if (unlikely(!var5)) {
+var_class_name = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 372);
+show_backtrace(1);
 }
 var6 = var_index >= var2;
 var3 = var6;
 goto RET_LABEL4;
 RET_LABEL4:(void)0;
 }
+}
 var_ = var3;
 if (var3){
 var7 = self->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <self:Array[nullable Object]> */
-{ /* Inline kernel#Int#< (var_index,var7) */
+{
+{ /* Inline kernel#Int#< (var_index,var7) on <var_index:Int> */
 /* Covariant cast for argument 0 (i) <var7:Int> isa OTHER */
 /* <var7:Int> isa OTHER */
 var10 = 1; /* easy <var7:Int> isa OTHER*/
-if (!var10) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 257);
-exit(1);
-}
-var13 = var_index < var7;
-var8 = var13;
+if (unlikely(!var10)) {
+var_class_name13 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name13);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 371);
+show_backtrace(1);
+}
+var14 = var_index < var7;
+var8 = var14;
 goto RET_LABEL9;
 RET_LABEL9:(void)0;
 }
+}
 var1 = var8;
 } else {
 var1 = var_;
 }
-if (!var1) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert \'index\' failed", "lib/standard/collection/array.nit", 267);
-exit(1);
+if (unlikely(!var1)) {
+PRINT_ERROR("Runtime error: %s", "Assert \'index\' failed");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 258);
+show_backtrace(1);
 }
-var14 = self->attrs[COLOR_array__Array___items].val; /* _items on <self:Array[nullable Object]> */
-if (var14 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "lib/standard/collection/array.nit", 268);
-exit(1);
+var15 = self->attrs[COLOR_array__Array___items].val; /* _items on <self:Array[nullable Object]> */
+if (var15 == NULL) {
+PRINT_ERROR("Runtime error: %s", "Receiver is null");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 259);
+show_backtrace(1);
 } else {
-var15 = ((val* (*)(val*, long))(var14->class->vft[COLOR_array__NativeArray___91d_93d]))(var14, var_index) /* [] on <var14:nullable NativeArray[nullable Object]>*/;
+{ /* Inline array#NativeArray#[] (var15,var_index) on <var15:nullable NativeArray[nullable Object]> */
+var18 = ((struct instance_array__NativeArray*)var15)->values[var_index];
+var16 = var18;
+goto RET_LABEL17;
+RET_LABEL17:(void)0;
 }
-var = var15;
+}
+var = var16;
 goto RET_LABEL;
 RET_LABEL:;
 return var;
@@ -1764,6 +2103,7 @@ int cltype;
 int idtype;
 const struct type* type_struct;
 short int is_nullable;
+const char* var_class_name;
 long var_index /* var index: Int */;
 val* var_item /* var item: nullable Object */;
 short int var1 /* : Bool */;
@@ -1772,38 +2112,60 @@ short int var3 /* : Bool */;
 short int var5 /* : Bool */;
 int cltype6;
 int idtype7;
-short int var8 /* : Bool */;
+const char* var_class_name8;
+short int var9 /* : Bool */;
 short int var_ /* var : Bool */;
-long var9 /* : Int */;
 long var10 /* : Int */;
 long var11 /* : Int */;
-long var13 /* : Int */;
+long var12 /* : Int */;
 short int var14 /* : Bool */;
-short int var16 /* : Bool */;
-int cltype17;
-int idtype18;
+int cltype15;
+int idtype16;
+const char* var_class_name17;
+long var18 /* : Int */;
 short int var19 /* : Bool */;
-long var20 /* : Int */;
 short int var21 /* : Bool */;
-short int var23 /* : Bool */;
-int cltype24;
-int idtype25;
-short int var26 /* : Bool */;
-long var27 /* : Int */;
-long var28 /* : Int */;
-long var30 /* : Int */;
-long var31 /* : Int */;
-short int var32 /* : Bool */;
-short int var34 /* : Bool */;
-int cltype35;
-int idtype36;
+int cltype22;
+int idtype23;
+const char* var_class_name24;
+short int var25 /* : Bool */;
+long var26 /* : Int */;
+short int var27 /* : Bool */;
+short int var29 /* : Bool */;
+int cltype30;
+int idtype31;
+const char* var_class_name32;
+short int var33 /* : Bool */;
+long var34 /* : Int */;
+long var35 /* : Int */;
 short int var37 /* : Bool */;
-long var38 /* : Int */;
-long var39 /* : Int */;
+int cltype38;
+int idtype39;
+const char* var_class_name40;
 long var41 /* : Int */;
-val* var42 /* : nullable NativeArray[nullable Object] */;
-/* Covariant cast for argument 1 (item) <p1:nullable Object> isa Sequence#0 */
-/* <p1:nullable Object> isa Sequence#0 */
+long var42 /* : Int */;
+short int var43 /* : Bool */;
+short int var45 /* : Bool */;
+int cltype46;
+int idtype47;
+const char* var_class_name48;
+short int var49 /* : Bool */;
+long var50 /* : Int */;
+long var51 /* : Int */;
+short int var53 /* : Bool */;
+int cltype54;
+int idtype55;
+const char* var_class_name56;
+long var57 /* : Int */;
+val* var58 /* : nullable NativeArray[nullable Object] */;
+short int var60 /* : Bool */;
+int cltype61;
+int idtype62;
+const struct type* type_struct63;
+short int is_nullable64;
+const char* var_class_name65;
+/* Covariant cast for argument 1 (item) <p1:nullable Object> isa E */
+/* <p1:nullable Object> isa E */
 type_struct = self->type->resolution_table->types[COLOR_abstract_collection__Sequence_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -1817,119 +2179,198 @@ var = 0;
 var = p1->type->type_table[cltype] == idtype;
 }
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 271);
-exit(1);
+if (unlikely(!var)) {
+var_class_name = p1 == NULL ? "null" : p1->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "E", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 262);
+show_backtrace(1);
 }
 var_index = p0;
 var_item = p1;
 var2 = 0;
-{ /* Inline kernel#Int#>= (var_index,var2) */
+{
+{ /* Inline kernel#Int#>= (var_index,var2) on <var_index:Int> */
 /* Covariant cast for argument 0 (i) <var2:Int> isa OTHER */
 /* <var2:Int> isa OTHER */
 var5 = 1; /* easy <var2:Int> isa OTHER*/
-if (!var5) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 258);
-exit(1);
-}
-var8 = var_index >= var2;
-var3 = var8;
+if (unlikely(!var5)) {
+var_class_name8 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name8);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 372);
+show_backtrace(1);
+}
+var9 = var_index >= var2;
+var3 = var9;
 goto RET_LABEL4;
 RET_LABEL4:(void)0;
 }
+}
 var_ = var3;
 if (var3){
-var9 = self->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <self:Array[nullable Object]> */
-var10 = 1;
-{ /* Inline kernel#Int#+ (var9,var10) */
-var13 = var9 + var10;
-var11 = var13;
-goto RET_LABEL12;
-RET_LABEL12:(void)0;
-}
-{ /* Inline kernel#Int#< (var_index,var11) */
+var10 = self->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <self:Array[nullable Object]> */
+var11 = 1;
+{
+{ /* Inline kernel#Int#+ (var10,var11) on <var10:Int> */
 /* Covariant cast for argument 0 (i) <var11:Int> isa OTHER */
 /* <var11:Int> isa OTHER */
-var16 = 1; /* easy <var11:Int> isa OTHER*/
-if (!var16) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 257);
-exit(1);
+var14 = 1; /* easy <var11:Int> isa OTHER*/
+if (unlikely(!var14)) {
+var_class_name17 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name17);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 374);
+show_backtrace(1);
+}
+var18 = var10 + var11;
+var12 = var18;
+goto RET_LABEL13;
+RET_LABEL13:(void)0;
 }
-var19 = var_index < var11;
-var14 = var19;
-goto RET_LABEL15;
-RET_LABEL15:(void)0;
 }
-var1 = var14;
+{
+{ /* Inline kernel#Int#< (var_index,var12) on <var_index:Int> */
+/* Covariant cast for argument 0 (i) <var12:Int> isa OTHER */
+/* <var12:Int> isa OTHER */
+var21 = 1; /* easy <var12:Int> isa OTHER*/
+if (unlikely(!var21)) {
+var_class_name24 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name24);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 371);
+show_backtrace(1);
+}
+var25 = var_index < var12;
+var19 = var25;
+goto RET_LABEL20;
+RET_LABEL20:(void)0;
+}
+}
+var1 = var19;
 } else {
 var1 = var_;
 }
-if (!var1) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert \'index\' failed", "lib/standard/collection/array.nit", 273);
-exit(1);
+if (unlikely(!var1)) {
+PRINT_ERROR("Runtime error: %s", "Assert \'index\' failed");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 264);
+show_backtrace(1);
 }
-var20 = self->attrs[COLOR_array__Array___capacity].l; /* _capacity on <self:Array[nullable Object]> */
-{ /* Inline kernel#Int#<= (var20,var_index) */
+var26 = self->attrs[COLOR_array__Array___capacity].l; /* _capacity on <self:Array[nullable Object]> */
+{
+{ /* Inline kernel#Int#<= (var26,var_index) on <var26:Int> */
+/* Covariant cast for argument 0 (i) <var_index:Int> isa OTHER */
+/* <var_index:Int> isa OTHER */
+var29 = 1; /* easy <var_index:Int> isa OTHER*/
+if (unlikely(!var29)) {
+var_class_name32 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name32);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 370);
+show_backtrace(1);
+}
+var33 = var26 <= var_index;
+var27 = var33;
+goto RET_LABEL28;
+RET_LABEL28:(void)0;
+}
+}
+if (var27){
+var34 = 1;
+{
+{ /* Inline kernel#Int#+ (var_index,var34) on <var_index:Int> */
+/* Covariant cast for argument 0 (i) <var34:Int> isa OTHER */
+/* <var34:Int> isa OTHER */
+var37 = 1; /* easy <var34:Int> isa OTHER*/
+if (unlikely(!var37)) {
+var_class_name40 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name40);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 374);
+show_backtrace(1);
+}
+var41 = var_index + var34;
+var35 = var41;
+goto RET_LABEL36;
+RET_LABEL36:(void)0;
+}
+}
+{
+array__Array__enlarge(self, var35); /* Direct call array#Array#enlarge on <self:Array[nullable Object]>*/
+}
+} else {
+}
+var42 = self->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <self:Array[nullable Object]> */
+{
+{ /* Inline kernel#Int#<= (var42,var_index) on <var42:Int> */
 /* Covariant cast for argument 0 (i) <var_index:Int> isa OTHER */
 /* <var_index:Int> isa OTHER */
-var23 = 1; /* easy <var_index:Int> isa OTHER*/
-if (!var23) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 256);
-exit(1);
+var45 = 1; /* easy <var_index:Int> isa OTHER*/
+if (unlikely(!var45)) {
+var_class_name48 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name48);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 370);
+show_backtrace(1);
 }
-var26 = var20 <= var_index;
-var21 = var26;
-goto RET_LABEL22;
-RET_LABEL22:(void)0;
+var49 = var42 <= var_index;
+var43 = var49;
+goto RET_LABEL44;
+RET_LABEL44:(void)0;
 }
-if (var21){
-var27 = 1;
-{ /* Inline kernel#Int#+ (var_index,var27) */
-var30 = var_index + var27;
-var28 = var30;
-goto RET_LABEL29;
-RET_LABEL29:(void)0;
 }
-((void (*)(val*, long))(self->class->vft[COLOR_array__AbstractArray__enlarge]))(self, var28) /* enlarge on <self:Array[nullable Object]>*/;
-} else {
+if (var43){
+var50 = 1;
+{
+{ /* Inline kernel#Int#+ (var_index,var50) on <var_index:Int> */
+/* Covariant cast for argument 0 (i) <var50:Int> isa OTHER */
+/* <var50:Int> isa OTHER */
+var53 = 1; /* easy <var50:Int> isa OTHER*/
+if (unlikely(!var53)) {
+var_class_name56 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name56);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 374);
+show_backtrace(1);
 }
-var31 = self->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <self:Array[nullable Object]> */
-{ /* Inline kernel#Int#<= (var31,var_index) */
-/* Covariant cast for argument 0 (i) <var_index:Int> isa OTHER */
-/* <var_index:Int> isa OTHER */
-var34 = 1; /* easy <var_index:Int> isa OTHER*/
-if (!var34) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 256);
-exit(1);
+var57 = var_index + var50;
+var51 = var57;
+goto RET_LABEL52;
+RET_LABEL52:(void)0;
 }
-var37 = var31 <= var_index;
-var32 = var37;
-goto RET_LABEL33;
-RET_LABEL33:(void)0;
 }
-if (var32){
-var38 = 1;
-{ /* Inline kernel#Int#+ (var_index,var38) */
-var41 = var_index + var38;
-var39 = var41;
-goto RET_LABEL40;
-RET_LABEL40:(void)0;
-}
-self->attrs[COLOR_array__AbstractArrayRead___length].l = var39; /* _length on <self:Array[nullable Object]> */
+self->attrs[COLOR_array__AbstractArrayRead___length].l = var51; /* _length on <self:Array[nullable Object]> */
 } else {
 }
-var42 = self->attrs[COLOR_array__Array___items].val; /* _items on <self:Array[nullable Object]> */
-if (var42 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "lib/standard/collection/array.nit", 280);
-exit(1);
+var58 = self->attrs[COLOR_array__Array___items].val; /* _items on <self:Array[nullable Object]> */
+if (var58 == NULL) {
+PRINT_ERROR("Runtime error: %s", "Receiver is null");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 271);
+show_backtrace(1);
 } else {
-((void (*)(val*, long, val*))(var42->class->vft[COLOR_array__NativeArray___91d_93d_61d]))(var42, var_index, var_item) /* []= on <var42:nullable NativeArray[nullable Object]>*/;
+{ /* Inline array#NativeArray#[]= (var58,var_index,var_item) on <var58:nullable NativeArray[nullable Object]> */
+/* Covariant cast for argument 1 (item) <var_item:nullable Object> isa E */
+/* <var_item:nullable Object> isa E */
+type_struct63 = var58->type->resolution_table->types[COLOR_array__NativeArray_FT0];
+cltype61 = type_struct63->color;
+idtype62 = type_struct63->id;
+is_nullable64 = type_struct63->is_nullable;
+if(var_item == NULL) {
+var60 = is_nullable64;
+} else {
+if(cltype61 >= var_item->type->table_size) {
+var60 = 0;
+} else {
+var60 = var_item->type->type_table[cltype61] == idtype62;
+}
+}
+if (unlikely(!var60)) {
+var_class_name65 = var_item == NULL ? "null" : var_item->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "E", var_class_name65);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 778);
+show_backtrace(1);
+}
+((struct instance_array__NativeArray*)var58)->values[var_index]=var_item;
+RET_LABEL59:(void)0;
+}
 }
 RET_LABEL:;
 }
 /* method array#Array#[]= for (self: Object, Int, nullable Object) */
 void VIRTUAL_array__Array___91d_93d_61d(val* self, long p0, val* p1) {
-array__Array___91d_93d_61d(self, p0, p1);
+array__Array___91d_93d_61d(self, p0, p1); /* Direct call array#Array#[]= on <self:Object(Array[nullable Object])>*/
 RET_LABEL:;
 }
 /* method array#Array#add for (self: Array[nullable Object], nullable Object) */
@@ -1939,6 +2380,7 @@ int cltype;
 int idtype;
 const struct type* type_struct;
 short int is_nullable;
+const char* var_class_name;
 val* var_item /* var item: nullable Object */;
 long var1 /* : Int */;
 long var_l /* var l: Int */;
@@ -1947,16 +2389,31 @@ short int var3 /* : Bool */;
 short int var5 /* : Bool */;
 int cltype6;
 int idtype7;
-short int var8 /* : Bool */;
-long var9 /* : Int */;
+const char* var_class_name8;
+short int var9 /* : Bool */;
 long var10 /* : Int */;
-long var12 /* : Int */;
-long var13 /* : Int */;
-long var14 /* : Int */;
-long var16 /* : Int */;
-val* var17 /* : nullable NativeArray[nullable Object] */;
-/* Covariant cast for argument 0 (item) <p0:nullable Object> isa SimpleCollection#0 */
-/* <p0:nullable Object> isa SimpleCollection#0 */
+long var11 /* : Int */;
+short int var13 /* : Bool */;
+int cltype14;
+int idtype15;
+const char* var_class_name16;
+long var17 /* : Int */;
+long var18 /* : Int */;
+long var19 /* : Int */;
+short int var21 /* : Bool */;
+int cltype22;
+int idtype23;
+const char* var_class_name24;
+long var25 /* : Int */;
+val* var26 /* : nullable NativeArray[nullable Object] */;
+short int var28 /* : Bool */;
+int cltype29;
+int idtype30;
+const struct type* type_struct31;
+short int is_nullable32;
+const char* var_class_name33;
+/* Covariant cast for argument 0 (item) <p0:nullable Object> isa E */
+/* <p0:nullable Object> isa E */
 type_struct = self->type->resolution_table->types[COLOR_abstract_collection__SimpleCollection_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -1970,58 +2427,113 @@ var = 0;
 var = p0->type->type_table[cltype] == idtype;
 }
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 283);
-exit(1);
+if (unlikely(!var)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "E", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 274);
+show_backtrace(1);
 }
 var_item = p0;
 var1 = self->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <self:Array[nullable Object]> */
 var_l = var1;
 var2 = self->attrs[COLOR_array__Array___capacity].l; /* _capacity on <self:Array[nullable Object]> */
-{ /* Inline kernel#Int#<= (var2,var_l) */
+{
+{ /* Inline kernel#Int#<= (var2,var_l) on <var2:Int> */
 /* Covariant cast for argument 0 (i) <var_l:Int> isa OTHER */
 /* <var_l:Int> isa OTHER */
 var5 = 1; /* easy <var_l:Int> isa OTHER*/
-if (!var5) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 256);
-exit(1);
-}
-var8 = var2 <= var_l;
-var3 = var8;
+if (unlikely(!var5)) {
+var_class_name8 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name8);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 370);
+show_backtrace(1);
+}
+var9 = var2 <= var_l;
+var3 = var9;
 goto RET_LABEL4;
 RET_LABEL4:(void)0;
 }
+}
 if (var3){
-var9 = 1;
-{ /* Inline kernel#Int#+ (var_l,var9) */
-var12 = var_l + var9;
-var10 = var12;
-goto RET_LABEL11;
-RET_LABEL11:(void)0;
+var10 = 1;
+{
+{ /* Inline kernel#Int#+ (var_l,var10) on <var_l:Int> */
+/* Covariant cast for argument 0 (i) <var10:Int> isa OTHER */
+/* <var10:Int> isa OTHER */
+var13 = 1; /* easy <var10:Int> isa OTHER*/
+if (unlikely(!var13)) {
+var_class_name16 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name16);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 374);
+show_backtrace(1);
+}
+var17 = var_l + var10;
+var11 = var17;
+goto RET_LABEL12;
+RET_LABEL12:(void)0;
+}
+}
+{
+array__Array__enlarge(self, var11); /* Direct call array#Array#enlarge on <self:Array[nullable Object]>*/
 }
-((void (*)(val*, long))(self->class->vft[COLOR_array__AbstractArray__enlarge]))(self, var10) /* enlarge on <self:Array[nullable Object]>*/;
 } else {
 }
-var13 = 1;
-{ /* Inline kernel#Int#+ (var_l,var13) */
-var16 = var_l + var13;
-var14 = var16;
-goto RET_LABEL15;
-RET_LABEL15:(void)0;
+var18 = 1;
+{
+{ /* Inline kernel#Int#+ (var_l,var18) on <var_l:Int> */
+/* Covariant cast for argument 0 (i) <var18:Int> isa OTHER */
+/* <var18:Int> isa OTHER */
+var21 = 1; /* easy <var18:Int> isa OTHER*/
+if (unlikely(!var21)) {
+var_class_name24 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name24);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 374);
+show_backtrace(1);
+}
+var25 = var_l + var18;
+var19 = var25;
+goto RET_LABEL20;
+RET_LABEL20:(void)0;
 }
-self->attrs[COLOR_array__AbstractArrayRead___length].l = var14; /* _length on <self:Array[nullable Object]> */
-var17 = self->attrs[COLOR_array__Array___items].val; /* _items on <self:Array[nullable Object]> */
-if (var17 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "lib/standard/collection/array.nit", 290);
-exit(1);
+}
+self->attrs[COLOR_array__AbstractArrayRead___length].l = var19; /* _length on <self:Array[nullable Object]> */
+var26 = self->attrs[COLOR_array__Array___items].val; /* _items on <self:Array[nullable Object]> */
+if (var26 == NULL) {
+PRINT_ERROR("Runtime error: %s", "Receiver is null");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 281);
+show_backtrace(1);
+} else {
+{ /* Inline array#NativeArray#[]= (var26,var_l,var_item) on <var26:nullable NativeArray[nullable Object]> */
+/* Covariant cast for argument 1 (item) <var_item:nullable Object> isa E */
+/* <var_item:nullable Object> isa E */
+type_struct31 = var26->type->resolution_table->types[COLOR_array__NativeArray_FT0];
+cltype29 = type_struct31->color;
+idtype30 = type_struct31->id;
+is_nullable32 = type_struct31->is_nullable;
+if(var_item == NULL) {
+var28 = is_nullable32;
 } else {
-((void (*)(val*, long, val*))(var17->class->vft[COLOR_array__NativeArray___91d_93d_61d]))(var17, var_l, var_item) /* []= on <var17:nullable NativeArray[nullable Object]>*/;
+if(cltype29 >= var_item->type->table_size) {
+var28 = 0;
+} else {
+var28 = var_item->type->type_table[cltype29] == idtype30;
+}
+}
+if (unlikely(!var28)) {
+var_class_name33 = var_item == NULL ? "null" : var_item->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "E", var_class_name33);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 778);
+show_backtrace(1);
+}
+((struct instance_array__NativeArray*)var26)->values[var_l]=var_item;
+RET_LABEL27:(void)0;
+}
 }
 RET_LABEL:;
 }
 /* method array#Array#add for (self: Object, nullable Object) */
 void VIRTUAL_array__Array__add(val* self, val* p0) {
-array__Array__add(self, p0);
+array__Array__add(self, p0); /* Direct call array#Array#add on <self:Object(Array[nullable Object])>*/
 RET_LABEL:;
 }
 /* method array#Array#enlarge for (self: Array[nullable Object], Int) */
@@ -2033,107 +2545,187 @@ short int var1 /* : Bool */;
 short int var3 /* : Bool */;
 int cltype;
 int idtype;
+const char* var_class_name;
 short int var4 /* : Bool */;
 short int var5 /* : Bool */;
 short int var7 /* : Bool */;
 int cltype8;
 int idtype9;
-short int var10 /* : Bool */;
-long var11 /* : Int */;
+const char* var_class_name10;
+short int var11 /* : Bool */;
 long var12 /* : Int */;
-long var14 /* : Int */;
-long var15 /* : Int */;
-long var16 /* : Int */;
-long var18 /* : Int */;
-val* var19 /* : NativeArray[nullable Object] */;
-val* var_a /* var a: NativeArray[nullable Object] */;
+long var13 /* : Int */;
+short int var15 /* : Bool */;
+int cltype16;
+int idtype17;
+const char* var_class_name18;
+long var19 /* : Int */;
 long var20 /* : Int */;
 long var21 /* : Int */;
-short int var22 /* : Bool */;
-short int var24 /* : Bool */;
-int cltype25;
-int idtype26;
-short int var27 /* : Bool */;
-val* var28 /* : nullable NativeArray[nullable Object] */;
-long var29 /* : Int */;
+short int var23 /* : Bool */;
+int cltype24;
+int idtype25;
+const char* var_class_name26;
+long var27 /* : Int */;
+val* var28 /* : NativeArray[nullable Object] */;
+val* var30 /* : NativeArray[nullable Object] */;
+val* var_a /* var a: NativeArray[nullable Object] */;
+long var31 /* : Int */;
+long var32 /* : Int */;
+short int var33 /* : Bool */;
+short int var35 /* : Bool */;
+int cltype36;
+int idtype37;
+const char* var_class_name38;
+short int var39 /* : Bool */;
+val* var40 /* : nullable NativeArray[nullable Object] */;
+long var41 /* : Int */;
+short int var43 /* : Bool */;
+int cltype44;
+int idtype45;
+const struct type* type_struct;
+const char* var_class_name46;
 var_cap = p0;
 var = self->attrs[COLOR_array__Array___capacity].l; /* _capacity on <self:Array[nullable Object]> */
 var_c = var;
-{ /* Inline kernel#Int#<= (var_cap,var_c) */
+{
+{ /* Inline kernel#Int#<= (var_cap,var_c) on <var_cap:Int> */
 /* Covariant cast for argument 0 (i) <var_c:Int> isa OTHER */
 /* <var_c:Int> isa OTHER */
 var3 = 1; /* easy <var_c:Int> isa OTHER*/
-if (!var3) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 256);
-exit(1);
+if (unlikely(!var3)) {
+var_class_name = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 370);
+show_backtrace(1);
 }
 var4 = var_cap <= var_c;
 var1 = var4;
 goto RET_LABEL2;
 RET_LABEL2:(void)0;
 }
+}
 if (var1){
 goto RET_LABEL;
 } else {
 }
 for(;;) {
-{ /* Inline kernel#Int#<= (var_c,var_cap) */
+{
+{ /* Inline kernel#Int#<= (var_c,var_cap) on <var_c:Int> */
 /* Covariant cast for argument 0 (i) <var_cap:Int> isa OTHER */
 /* <var_cap:Int> isa OTHER */
 var7 = 1; /* easy <var_cap:Int> isa OTHER*/
-if (!var7) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 256);
-exit(1);
-}
-var10 = var_c <= var_cap;
-var5 = var10;
+if (unlikely(!var7)) {
+var_class_name10 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name10);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 370);
+show_backtrace(1);
+}
+var11 = var_c <= var_cap;
+var5 = var11;
 goto RET_LABEL6;
 RET_LABEL6:(void)0;
 }
-if (!var5) break;
-var11 = 2;
-{ /* Inline kernel#Int#* (var_c,var11) */
-var14 = var_c * var11;
-var12 = var14;
-goto RET_LABEL13;
-RET_LABEL13:(void)0;
 }
-var15 = 2;
-{ /* Inline kernel#Int#+ (var12,var15) */
-var18 = var12 + var15;
-var16 = var18;
-goto RET_LABEL17;
-RET_LABEL17:(void)0;
+if (var5){
+var12 = 2;
+{
+{ /* Inline kernel#Int#* (var_c,var12) on <var_c:Int> */
+/* Covariant cast for argument 0 (i) <var12:Int> isa OTHER */
+/* <var12:Int> isa OTHER */
+var15 = 1; /* easy <var12:Int> isa OTHER*/
+if (unlikely(!var15)) {
+var_class_name18 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name18);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 378);
+show_backtrace(1);
+}
+var19 = var_c * var12;
+var13 = var19;
+goto RET_LABEL14;
+RET_LABEL14:(void)0;
+}
+}
+var20 = 2;
+{
+{ /* Inline kernel#Int#+ (var13,var20) on <var13:Int> */
+/* Covariant cast for argument 0 (i) <var20:Int> isa OTHER */
+/* <var20:Int> isa OTHER */
+var23 = 1; /* easy <var20:Int> isa OTHER*/
+if (unlikely(!var23)) {
+var_class_name26 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name26);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 374);
+show_backtrace(1);
+}
+var27 = var13 + var20;
+var21 = var27;
+goto RET_LABEL22;
+RET_LABEL22:(void)0;
+}
+}
+var_c = var21;
+} else {
+goto BREAK_label;
 }
-var_c = var16;
-CONTINUE_label: (void)0;
 }
 BREAK_label: (void)0;
-var19 = ((val* (*)(val*, long))(self->class->vft[COLOR_array__ArrayCapable__calloc_array]))(self, var_c) /* calloc_array on <self:Array[nullable Object]>*/;
-var_a = var19;
-var20 = self->attrs[COLOR_array__Array___capacity].l; /* _capacity on <self:Array[nullable Object]> */
-var21 = 0;
-{ /* Inline kernel#Int#> (var20,var21) */
-/* Covariant cast for argument 0 (i) <var21:Int> isa OTHER */
-/* <var21:Int> isa OTHER */
-var24 = 1; /* easy <var21:Int> isa OTHER*/
-if (!var24) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 259);
-exit(1);
+{
+{ /* Inline array#ArrayCapable#calloc_array (self,var_c) on <self:Array[nullable Object]> */
+var30 = NEW_array__NativeArray(var_c, self->type->resolution_table->types[COLOR_array__NativeArrayarray__ArrayCapable_FT0]);
+var28 = var30;
+goto RET_LABEL29;
+RET_LABEL29:(void)0;
 }
-var27 = var20 > var21;
-var22 = var27;
-goto RET_LABEL23;
-RET_LABEL23:(void)0;
 }
-if (var22){
-var28 = self->attrs[COLOR_array__Array___items].val; /* _items on <self:Array[nullable Object]> */
-var29 = self->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <self:Array[nullable Object]> */
-if (var28 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Reciever is null", "lib/standard/collection/array.nit", 299);
-exit(1);
-} else {
-((void (*)(val*, val*, long))(var28->class->vft[COLOR_array__NativeArray__copy_to]))(var28, var_a, var29) /* copy_to on <var28:nullable NativeArray[nullable Object]>*/;
+var_a = var28;
+var31 = self->attrs[COLOR_array__Array___capacity].l; /* _capacity on <self:Array[nullable Object]> */
+var32 = 0;
+{
+{ /* Inline kernel#Int#> (var31,var32) on <var31:Int> */
+/* Covariant cast for argument 0 (i) <var32:Int> isa OTHER */
+/* <var32:Int> isa OTHER */
+var35 = 1; /* easy <var32:Int> isa OTHER*/
+if (unlikely(!var35)) {
+var_class_name38 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name38);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 373);
+show_backtrace(1);
+}
+var39 = var31 > var32;
+var33 = var39;
+goto RET_LABEL34;
+RET_LABEL34:(void)0;
+}
+}
+if (var33){
+var40 = self->attrs[COLOR_array__Array___items].val; /* _items on <self:Array[nullable Object]> */
+var41 = self->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <self:Array[nullable Object]> */
+if (var40 == NULL) {
+PRINT_ERROR("Runtime error: %s", "Receiver is null");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 290);
+show_backtrace(1);
+} else {
+{ /* Inline array#NativeArray#copy_to (var40,var_a,var41) on <var40:nullable NativeArray[nullable Object]> */
+/* Covariant cast for argument 0 (dest) <var_a:NativeArray[nullable Object]> isa NativeArray[E] */
+/* <var_a:NativeArray[nullable Object]> isa NativeArray[E] */
+type_struct = var40->type->resolution_table->types[COLOR_array__NativeArrayarray__NativeArray_FT0];
+cltype44 = type_struct->color;
+idtype45 = type_struct->id;
+if(cltype44 >= var_a->type->table_size) {
+var43 = 0;
+} else {
+var43 = var_a->type->type_table[cltype44] == idtype45;
+}
+if (unlikely(!var43)) {
+var_class_name46 = var_a == NULL ? "null" : var_a->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "NativeArray[E]", var_class_name46);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 779);
+show_backtrace(1);
+}
+memmove(((struct instance_array__NativeArray*)var_a)->values, ((struct instance_array__NativeArray*)var40)->values, var41*sizeof(val*));
+RET_LABEL42:(void)0;
+}
 }
 } else {
 }
@@ -2143,14 +2735,16 @@ RET_LABEL:;
 }
 /* method array#Array#enlarge for (self: Object, Int) */
 void VIRTUAL_array__Array__enlarge(val* self, long p0) {
-array__Array__enlarge(self, p0);
+array__Array__enlarge(self, p0); /* Direct call array#Array#enlarge on <self:Object(Array[nullable Object])>*/
 RET_LABEL:;
 }
 /* method array#Array#init for (self: Array[nullable Object]) */
 void array__Array__init(val* self) {
 long var /* : Int */;
 long var1 /* : Int */;
-((void (*)(val*))(self->class->vft[COLOR_array__AbstractArray__init]))(self) /* init on <self:Array[nullable Object]>*/;
+{
+((void (*)(val*))(self->class->vft[COLOR_array__Array__init]))(self) /* init on <self:Array[nullable Object]>*/;
+}
 var = 0;
 self->attrs[COLOR_array__Array___capacity].l = var; /* _capacity on <self:Array[nullable Object]> */
 var1 = 0;
@@ -2159,40 +2753,7 @@ RET_LABEL:;
 }
 /* method array#Array#init for (self: Object) */
 void VIRTUAL_array__Array__init(val* self) {
-array__Array__init(self);
-RET_LABEL:;
-}
-/* method array#Array#from for (self: Array[nullable Object], Collection[nullable Object]) */
-void array__Array__from(val* self, val* p0) {
-short int var /* : Bool */;
-int cltype;
-int idtype;
-const struct type* type_struct;
-val* var_items /* var items: Collection[nullable Object] */;
-long var1 /* : Int */;
-/* Covariant cast for argument 0 (items) <p0:Collection[nullable Object]> isa Collection[Array#0] */
-/* <p0:Collection[nullable Object]> isa Collection[Array#0] */
-type_struct = self->type->resolution_table->types[COLOR_abstract_collection__Collectionarray__Array_FT0];
-cltype = type_struct->color;
-idtype = type_struct->id;
-if(cltype >= p0->type->table_size) {
-var = 0;
-} else {
-var = p0->type->type_table[cltype] == idtype;
-}
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 311);
-exit(1);
-}
-var_items = p0;
-var1 = ((long (*)(val*))(var_items->class->vft[COLOR_abstract_collection__Collection__length]))(var_items) /* length on <var_items:Collection[nullable Object]>*/;
-((void (*)(val*, long))(self->class->vft[COLOR_array__Array__with_capacity]))(self, var1) /* with_capacity on <self:Array[nullable Object]>*/;
-((void (*)(val*, val*))(self->class->vft[COLOR_abstract_collection__SimpleCollection__add_all]))(self, var_items) /* add_all on <self:Array[nullable Object]>*/;
-RET_LABEL:;
-}
-/* method array#Array#from for (self: Object, Collection[nullable Object]) */
-void VIRTUAL_array__Array__from(val* self, val* p0) {
-array__Array__from(self, p0);
+array__Array__init(self); /* Direct call array#Array#init on <self:Object(Array[nullable Object])>*/
 RET_LABEL:;
 }
 /* method array#Array#with_items for (self: Array[nullable Object], Array[nullable Object]) */
@@ -2201,168 +2762,87 @@ val* var_objects /* var objects: Array[nullable Object] */;
 val* var /* : nullable NativeArray[nullable Object] */;
 long var1 /* : Int */;
 long var2 /* : Int */;
+long var4 /* : Int */;
+{
+((void (*)(val*))(self->class->vft[COLOR_kernel__Object__init]))(self) /* init on <self:Array[nullable Object]>*/;
+}
 var_objects = p0;
-((void (*)(val*))(self->class->vft[COLOR_array__AbstractArray__init]))(self) /* init on <self:Array[nullable Object]>*/;
 var = var_objects->attrs[COLOR_array__Array___items].val; /* _items on <var_objects:Array[nullable Object]> */
 self->attrs[COLOR_array__Array___items].val = var; /* _items on <self:Array[nullable Object]> */
 var1 = var_objects->attrs[COLOR_array__Array___capacity].l; /* _capacity on <var_objects:Array[nullable Object]> */
 self->attrs[COLOR_array__Array___capacity].l = var1; /* _capacity on <self:Array[nullable Object]> */
-var2 = ((long (*)(val*))(var_objects->class->vft[COLOR_abstract_collection__Collection__length]))(var_objects) /* length on <var_objects:Array[nullable Object]>*/;
+{
+{ /* Inline array#AbstractArrayRead#length (var_objects) on <var_objects:Array[nullable Object]> */
+var4 = var_objects->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <var_objects:Array[nullable Object]> */
+var2 = var4;
+RET_LABEL3:(void)0;
+}
+}
 self->attrs[COLOR_array__AbstractArrayRead___length].l = var2; /* _length on <self:Array[nullable Object]> */
 RET_LABEL:;
 }
 /* method array#Array#with_items for (self: Object, Array[nullable Object]) */
 void VIRTUAL_array__Array__with_items(val* self, val* p0) {
-array__Array__with_items(self, p0);
+array__Array__with_items(self, p0); /* Direct call array#Array#with_items on <self:Object(Array[nullable Object])>*/
 RET_LABEL:;
 }
 /* method array#Array#with_capacity for (self: Array[nullable Object], Int) */
 void array__Array__with_capacity(val* self, long p0) {
 long var_cap /* var cap: Int */;
 long var /* : Int */;
-short int var1 /* : Bool */;
-short int var3 /* : Bool */;
-int cltype;
-int idtype;
-short int var4 /* : Bool */;
-val* var5 /* : NativeArray[nullable Object] */;
-long var6 /* : Int */;
-var_cap = p0;
-((void (*)(val*))(self->class->vft[COLOR_array__AbstractArray__init]))(self) /* init on <self:Array[nullable Object]>*/;
-var = 0;
-{ /* Inline kernel#Int#>= (var_cap,var) */
-/* Covariant cast for argument 0 (i) <var:Int> isa OTHER */
-/* <var:Int> isa OTHER */
-var3 = 1; /* easy <var:Int> isa OTHER*/
-if (!var3) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 258);
-exit(1);
-}
-var4 = var_cap >= var;
-var1 = var4;
-goto RET_LABEL2;
-RET_LABEL2:(void)0;
-}
-if (!var1) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert \'positive\' failed", "lib/standard/collection/array.nit", 328);
-exit(1);
-}
-var5 = ((val* (*)(val*, long))(self->class->vft[COLOR_array__ArrayCapable__calloc_array]))(self, var_cap) /* calloc_array on <self:Array[nullable Object]>*/;
-self->attrs[COLOR_array__Array___items].val = var5; /* _items on <self:Array[nullable Object]> */
-self->attrs[COLOR_array__Array___capacity].l = var_cap; /* _capacity on <self:Array[nullable Object]> */
-var6 = 0;
-self->attrs[COLOR_array__AbstractArrayRead___length].l = var6; /* _length on <self:Array[nullable Object]> */
-RET_LABEL:;
-}
-/* method array#Array#with_capacity for (self: Object, Int) */
-void VIRTUAL_array__Array__with_capacity(val* self, long p0) {
-array__Array__with_capacity(self, p0);
-RET_LABEL:;
-}
-/* method array#Array#filled_with for (self: Array[nullable Object], nullable Object, Int) */
-void array__Array__filled_with(val* self, val* p0, long p1) {
-short int var /* : Bool */;
+short int var1 /* : Bool */;
+short int var3 /* : Bool */;
 int cltype;
 int idtype;
-const struct type* type_struct;
-short int is_nullable;
-val* var_value /* var value: nullable Object */;
-long var_count /* var count: Int */;
-long var1 /* : Int */;
-short int var2 /* : Bool */;
+const char* var_class_name;
 short int var4 /* : Bool */;
-int cltype5;
-int idtype6;
-short int var7 /* : Bool */;
-val* var8 /* : NativeArray[nullable Object] */;
-long var9 /* : Int */;
-long var_i /* var i: Int */;
-short int var10 /* : Bool */;
-short int var12 /* : Bool */;
-int cltype13;
-int idtype14;
-short int var15 /* : Bool */;
-long var16 /* : Int */;
-long var17 /* : Int */;
-long var19 /* : Int */;
-/* Covariant cast for argument 0 (value) <p0:nullable Object> isa Array#0 */
-/* <p0:nullable Object> isa Array#0 */
-type_struct = self->type->resolution_table->types[COLOR_array__Array_FT0];
-cltype = type_struct->color;
-idtype = type_struct->id;
-is_nullable = type_struct->is_nullable;
-if(p0 == NULL) {
-var = is_nullable;
-} else {
-if(cltype >= p0->type->table_size) {
-var = 0;
-} else {
-var = p0->type->type_table[cltype] == idtype;
-}
-}
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 334);
-exit(1);
+val* var5 /* : NativeArray[nullable Object] */;
+val* var7 /* : NativeArray[nullable Object] */;
+long var8 /* : Int */;
+{
+((void (*)(val*))(self->class->vft[COLOR_kernel__Object__init]))(self) /* init on <self:Array[nullable Object]>*/;
 }
-var_value = p0;
-var_count = p1;
-((void (*)(val*))(self->class->vft[COLOR_array__AbstractArray__init]))(self) /* init on <self:Array[nullable Object]>*/;
-var1 = 0;
-{ /* Inline kernel#Int#>= (var_count,var1) */
-/* Covariant cast for argument 0 (i) <var1:Int> isa OTHER */
-/* <var1:Int> isa OTHER */
-var4 = 1; /* easy <var1:Int> isa OTHER*/
-if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 258);
-exit(1);
+var_cap = p0;
+var = 0;
+{
+{ /* Inline kernel#Int#>= (var_cap,var) on <var_cap:Int> */
+/* Covariant cast for argument 0 (i) <var:Int> isa OTHER */
+/* <var:Int> isa OTHER */
+var3 = 1; /* easy <var:Int> isa OTHER*/
+if (unlikely(!var3)) {
+var_class_name = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 372);
+show_backtrace(1);
 }
-var7 = var_count >= var1;
-var2 = var7;
-goto RET_LABEL3;
-RET_LABEL3:(void)0;
+var4 = var_cap >= var;
+var1 = var4;
+goto RET_LABEL2;
+RET_LABEL2:(void)0;
 }
-if (!var2) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert \'positive\' failed", "lib/standard/collection/array.nit", 337);
-exit(1);
 }
-var8 = ((val* (*)(val*, long))(self->class->vft[COLOR_array__ArrayCapable__calloc_array]))(self, var_count) /* calloc_array on <self:Array[nullable Object]>*/;
-self->attrs[COLOR_array__Array___items].val = var8; /* _items on <self:Array[nullable Object]> */
-self->attrs[COLOR_array__Array___capacity].l = var_count; /* _capacity on <self:Array[nullable Object]> */
-self->attrs[COLOR_array__AbstractArrayRead___length].l = var_count; /* _length on <self:Array[nullable Object]> */
-var9 = 0;
-var_i = var9;
-for(;;) {
-{ /* Inline kernel#Int#< (var_i,var_count) */
-/* Covariant cast for argument 0 (i) <var_count:Int> isa OTHER */
-/* <var_count:Int> isa OTHER */
-var12 = 1; /* easy <var_count:Int> isa OTHER*/
-if (!var12) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 257);
-exit(1);
-}
-var15 = var_i < var_count;
-var10 = var15;
-goto RET_LABEL11;
-RET_LABEL11:(void)0;
+if (unlikely(!var1)) {
+PRINT_ERROR("Runtime error: %s", "Assert \'positive\' failed");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 319);
+show_backtrace(1);
 }
-if (!var10) break;
-((void (*)(val*, long, val*))(self->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(self, var_i, var_value) /* []= on <self:Array[nullable Object]>*/;
-var16 = 1;
-{ /* Inline kernel#Int#+ (var_i,var16) */
-var19 = var_i + var16;
-var17 = var19;
-goto RET_LABEL18;
-RET_LABEL18:(void)0;
+{
+{ /* Inline array#ArrayCapable#calloc_array (self,var_cap) on <self:Array[nullable Object]> */
+var7 = NEW_array__NativeArray(var_cap, self->type->resolution_table->types[COLOR_array__NativeArrayarray__ArrayCapable_FT0]);
+var5 = var7;
+goto RET_LABEL6;
+RET_LABEL6:(void)0;
 }
-var_i = var17;
-CONTINUE_label: (void)0;
 }
-BREAK_label: (void)0;
+self->attrs[COLOR_array__Array___items].val = var5; /* _items on <self:Array[nullable Object]> */
+self->attrs[COLOR_array__Array___capacity].l = var_cap; /* _capacity on <self:Array[nullable Object]> */
+var8 = 0;
+self->attrs[COLOR_array__AbstractArrayRead___length].l = var8; /* _length on <self:Array[nullable Object]> */
 RET_LABEL:;
 }
-/* method array#Array#filled_with for (self: Object, nullable Object, Int) */
-void VIRTUAL_array__Array__filled_with(val* self, val* p0, long p1) {
-array__Array__filled_with(self, p0, p1);
+/* method array#Array#with_capacity for (self: Object, Int) */
+void VIRTUAL_array__Array__with_capacity(val* self, long p0) {
+array__Array__with_capacity(self, p0); /* Direct call array#Array#with_capacity on <self:Object(Array[nullable Object])>*/
 RET_LABEL:;
 }
 /* method array#Array#with_native for (self: Array[nullable Object], NativeArray[nullable Object], Int) */
@@ -2371,6 +2851,7 @@ short int var /* : Bool */;
 int cltype;
 int idtype;
 const struct type* type_struct;
+const char* var_class_name;
 val* var_nat /* var nat: NativeArray[nullable Object] */;
 long var_size /* var size: Int */;
 long var1 /* : Int */;
@@ -2378,9 +2859,10 @@ short int var2 /* : Bool */;
 short int var4 /* : Bool */;
 int cltype5;
 int idtype6;
-short int var7 /* : Bool */;
-/* Covariant cast for argument 0 (nat) <p0:NativeArray[nullable Object]> isa NativeArray[Array#0] */
-/* <p0:NativeArray[nullable Object]> isa NativeArray[Array#0] */
+const char* var_class_name7;
+short int var8 /* : Bool */;
+/* Covariant cast for argument 0 (nat) <p0:NativeArray[nullable Object]> isa NativeArray[E] */
+/* <p0:NativeArray[nullable Object]> isa NativeArray[E] */
 type_struct = self->type->resolution_table->types[COLOR_array__NativeArrayarray__Array_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -2389,30 +2871,39 @@ var = 0;
 } else {
 var = p0->type->type_table[cltype] == idtype;
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 348);
-exit(1);
+if (unlikely(!var)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "NativeArray[E]", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 339);
+show_backtrace(1);
+}
+{
+((void (*)(val*))(self->class->vft[COLOR_kernel__Object__init]))(self) /* init on <self:Array[nullable Object]>*/;
 }
 var_nat = p0;
 var_size = p1;
-((void (*)(val*))(self->class->vft[COLOR_array__AbstractArray__init]))(self) /* init on <self:Array[nullable Object]>*/;
 var1 = 0;
-{ /* Inline kernel#Int#>= (var_size,var1) */
+{
+{ /* Inline kernel#Int#>= (var_size,var1) on <var_size:Int> */
 /* Covariant cast for argument 0 (i) <var1:Int> isa OTHER */
 /* <var1:Int> isa OTHER */
 var4 = 1; /* easy <var1:Int> isa OTHER*/
-if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 258);
-exit(1);
-}
-var7 = var_size >= var1;
-var2 = var7;
+if (unlikely(!var4)) {
+var_class_name7 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name7);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 372);
+show_backtrace(1);
+}
+var8 = var_size >= var1;
+var2 = var8;
 goto RET_LABEL3;
 RET_LABEL3:(void)0;
 }
-if (!var2) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert \'positive\' failed", "lib/standard/collection/array.nit", 351);
-exit(1);
+}
+if (unlikely(!var2)) {
+PRINT_ERROR("Runtime error: %s", "Assert \'positive\' failed");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 342);
+show_backtrace(1);
 }
 self->attrs[COLOR_array__Array___items].val = var_nat; /* _items on <self:Array[nullable Object]> */
 self->attrs[COLOR_array__Array___capacity].l = var_size; /* _capacity on <self:Array[nullable Object]> */
@@ -2421,472 +2912,209 @@ RET_LABEL:;
 }
 /* method array#Array#with_native for (self: Object, NativeArray[nullable Object], Int) */
 void VIRTUAL_array__Array__with_native(val* self, val* p0, long p1) {
-array__Array__with_native(self, p0, p1);
-RET_LABEL:;
-}
-/* method array#Array#intern_items for (self: Array[nullable Object]): NativeArray[nullable Object] */
-val* array__Array__intern_items(val* self) {
-val* var /* : NativeArray[nullable Object] */;
-val* var1 /* : nullable NativeArray[nullable Object] */;
-var1 = self->attrs[COLOR_array__Array___items].val; /* _items on <self:Array[nullable Object]> */
-if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 362);
-exit(1);
-}
-var = var1;
-goto RET_LABEL;
-RET_LABEL:;
-return var;
-}
-/* method array#Array#intern_items for (self: Object): NativeArray[nullable Object] */
-val* VIRTUAL_array__Array__intern_items(val* self) {
-val* var /* : NativeArray[nullable Object] */;
-val* var1 /* : NativeArray[nullable Object] */;
-var1 = array__Array__intern_items(self);
-var = var1;
-RET_LABEL:;
-return var;
-}
-/* method array#Array#sort for (self: Array[nullable Object]) */
-void array__Array__sort(val* self) {
-long var /* : Int */;
-long var1 /* : Int */;
-long var2 /* : Int */;
-long var3 /* : Int */;
-long var5 /* : Int */;
-var = 0;
-var1 = ((long (*)(val*))(self->class->vft[COLOR_abstract_collection__Collection__length]))(self) /* length on <self:Array[nullable Object]>*/;
-var2 = 1;
-{ /* Inline kernel#Int#- (var1,var2) */
-var5 = var1 - var2;
-var3 = var5;
-goto RET_LABEL4;
-RET_LABEL4:(void)0;
-}
-((void (*)(val*, long, long))(self->class->vft[COLOR_array__Array__sub_sort]))(self, var, var3) /* sub_sort on <self:Array[nullable Object]>*/;
+array__Array__with_native(self, p0, p1); /* Direct call array#Array#with_native on <self:Object(Array[nullable Object])>*/
 RET_LABEL:;
 }
-/* method array#Array#sort for (self: Object) */
-void VIRTUAL_array__Array__sort(val* self) {
-array__Array__sort(self);
-RET_LABEL:;
-}
-/* method array#Array#sub_sort for (self: Array[nullable Object], Int, Int) */
-void array__Array__sub_sort(val* self, long p0, long p1) {
-long var_from /* var from: Int */;
-long var_to /* var to: Int */;
+/* method array#Array#== for (self: Array[nullable Object], nullable Object): Bool */
+short int array__Array___61d_61d(val* self, val* p0) {
 short int var /* : Bool */;
-short int var2 /* : Bool */;
+val* var_o /* var o: nullable Object */;
+short int var1 /* : Bool */;
 int cltype;
 int idtype;
+short int var2 /* : Bool */;
 short int var3 /* : Bool */;
-long var4 /* : Int */;
+short int var4 /* : Bool */;
 long var5 /* : Int */;
 long var7 /* : Int */;
-short int var8 /* : Bool */;
-short int var10 /* : Bool */;
-int cltype11;
-int idtype12;
-short int var13 /* : Bool */;
-val* var14 /* : nullable Object */;
-val* var_pivot /* var pivot: nullable Object */;
-long var_i /* var i: Int */;
-long var_j /* var j: Int */;
+long var_l /* var l: Int */;
+long var8 /* : Int */;
+long var10 /* : Int */;
+short int var11 /* : Bool */;
+short int var12 /* : Bool */;
+short int var14 /* : Bool */;
 short int var15 /* : Bool */;
-short int var17 /* : Bool */;
-int cltype18;
-int idtype19;
+short int var16 /* : Bool */;
+long var17 /* : Int */;
+long var_i /* var i: Int */;
+val* var18 /* : nullable NativeArray[nullable Object] */;
+val* var_it /* var it: nullable NativeArray[nullable Object] */;
+val* var19 /* : nullable NativeArray[nullable Object] */;
+val* var_oit /* var oit: nullable NativeArray[nullable Object] */;
 short int var20 /* : Bool */;
-short int var21 /* : Bool */;
 short int var22 /* : Bool */;
-short int var24 /* : Bool */;
-int cltype25;
-int idtype26;
-short int var27 /* : Bool */;
-short int var_ /* var : Bool */;
-long var28 /* : Int */;
-long var29 /* : Int */;
-short int var30 /* : Bool */;
+int cltype23;
+int idtype24;
+const char* var_class_name;
+short int var25 /* : Bool */;
+val* var26 /* : nullable Object */;
+val* var28 /* : nullable Object */;
+val* var29 /* : nullable Object */;
+val* var31 /* : nullable Object */;
 short int var32 /* : Bool */;
-int cltype33;
-int idtype34;
-short int var35 /* : Bool */;
+short int var33 /* : Bool */;
+short int var34 /* : Bool */;
+long var35 /* : Int */;
 long var36 /* : Int */;
-long var37 /* : Int */;
-long var39 /* : Int */;
-short int var40 /* : Bool */;
-short int var41 /* : Bool */;
+short int var38 /* : Bool */;
+int cltype39;
+int idtype40;
+const char* var_class_name41;
+long var42 /* : Int */;
 short int var43 /* : Bool */;
-int cltype44;
-int idtype45;
-short int var46 /* : Bool */;
-short int var_47 /* var : Bool */;
-long var48 /* : Int */;
-long var49 /* : Int */;
-short int var50 /* : Bool */;
-short int var52 /* : Bool */;
-int cltype53;
-int idtype54;
-short int var55 /* : Bool */;
-long var56 /* : Int */;
-long var57 /* : Int */;
-long var59 /* : Int */;
-short int var61 /* : Bool */;
-short int var63 /* : Bool */;
-int cltype64;
-int idtype65;
-short int var66 /* : Bool */;
-val* var67 /* : nullable Object */;
-val* var_t /* var t: nullable Object */;
-val* var68 /* : nullable Object */;
-long var70 /* : Int */;
-long var71 /* : Int */;
-long var73 /* : Int */;
-val* var74 /* : nullable Object */;
-long var75 /* : Int */;
-long var76 /* : Int */;
-long var78 /* : Int */;
-long var79 /* : Int */;
-long var80 /* : Int */;
-long var82 /* : Int */;
-long var_i83 /* var i: Int */;
-short int var84 /* : Bool */;
-short int var86 /* : Bool */;
-int cltype87;
-int idtype88;
-short int var89 /* : Bool */;
-long var_min /* var min: Int */;
-val* var90 /* : nullable Object */;
-val* var_min_v /* var min_v: nullable Object */;
-long var_j91 /* var j: Int */;
-short int var92 /* : Bool */;
-short int var94 /* : Bool */;
-int cltype95;
-int idtype96;
-short int var97 /* : Bool */;
-long var98 /* : Int */;
-long var99 /* : Int */;
-short int var100 /* : Bool */;
-short int var102 /* : Bool */;
-int cltype103;
-int idtype104;
-short int var105 /* : Bool */;
-val* var106 /* : nullable Object */;
-long var107 /* : Int */;
-long var108 /* : Int */;
-long var110 /* : Int */;
-short int var112 /* : Bool */;
-short int var114 /* : Bool */;
-short int var115 /* : Bool */;
-val* var116 /* : nullable Object */;
-long var117 /* : Int */;
-long var118 /* : Int */;
-long var120 /* : Int */;
-var_from = p0;
-var_to = p1;
-{ /* Inline kernel#Int#>= (var_from,var_to) */
-/* Covariant cast for argument 0 (i) <var_to:Int> isa OTHER */
-/* <var_to:Int> isa OTHER */
-var2 = 1; /* easy <var_to:Int> isa OTHER*/
-if (!var2) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 258);
-exit(1);
-}
-var3 = var_from >= var_to;
-var = var3;
-goto RET_LABEL1;
-RET_LABEL1:(void)0;
+var_o = p0;
+/* <var_o:nullable Object> isa Array[nullable Object] */
+cltype = type_array__Arraynullable_kernel__Object.color;
+idtype = type_array__Arraynullable_kernel__Object.id;
+if(var_o == NULL) {
+var1 = 0;
+} else {
+if(cltype >= var_o->type->table_size) {
+var1 = 0;
+} else {
+var1 = var_o->type->type_table[cltype] == idtype;
+}
 }
-if (var){
+var2 = !var1;
+if (var2){
+{
+var4 = ((short int (*)(val*, val*))(self->class->vft[COLOR_array__Array___61d_61d]))(self, p0) /* == on <self:Array[nullable Object]>*/;
+var3 = var4;
+}
+var = var3;
 goto RET_LABEL;
 } else {
-var4 = 7;
-{ /* Inline kernel#Int#+ (var_from,var4) */
-var7 = var_from + var4;
+}
+{
+{ /* Inline array#AbstractArrayRead#length (self) on <self:Array[nullable Object]> */
+var7 = self->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <self:Array[nullable Object]> */
 var5 = var7;
-goto RET_LABEL6;
 RET_LABEL6:(void)0;
 }
-{ /* Inline kernel#Int#< (var5,var_to) */
-/* Covariant cast for argument 0 (i) <var_to:Int> isa OTHER */
-/* <var_to:Int> isa OTHER */
-var10 = 1; /* easy <var_to:Int> isa OTHER*/
-if (!var10) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 257);
-exit(1);
 }
-var13 = var5 < var_to;
-var8 = var13;
-goto RET_LABEL9;
+var_l = var5;
+{
+{ /* Inline array#AbstractArrayRead#length (var_o) on <var_o:nullable Object(Array[nullable Object])> */
+var10 = var_o->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <var_o:nullable Object(Array[nullable Object])> */
+var8 = var10;
 RET_LABEL9:(void)0;
 }
-if (var8){
-var14 = ((val* (*)(val*, long))(self->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(self, var_from) /* [] on <self:Array[nullable Object]>*/;
-var_pivot = var14;
-var_i = var_from;
-var_j = var_to;
-for(;;) {
-{ /* Inline kernel#Int#> (var_j,var_i) */
-/* Covariant cast for argument 0 (i) <var_i:Int> isa OTHER */
-/* <var_i:Int> isa OTHER */
-var17 = 1; /* easy <var_i:Int> isa OTHER*/
-if (!var17) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 259);
-exit(1);
-}
-var20 = var_j > var_i;
-var15 = var20;
-goto RET_LABEL16;
-RET_LABEL16:(void)0;
-}
-if (!var15) break;
-for(;;) {
-{ /* Inline kernel#Int#<= (var_i,var_to) */
-/* Covariant cast for argument 0 (i) <var_to:Int> isa OTHER */
-/* <var_to:Int> isa OTHER */
-var24 = 1; /* easy <var_to:Int> isa OTHER*/
-if (!var24) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 256);
-exit(1);
-}
-var27 = var_i <= var_to;
-var22 = var27;
-goto RET_LABEL23;
-RET_LABEL23:(void)0;
 }
-var_ = var22;
-if (var22){
-printf("NOT YET IMPLEMENTED AClosureCallExpr:lib/standard/collection/array.nit:385,23--41\n");
-/* var28 = NOT YET AClosureCallExpr */
-var29 = 0;
-{ /* Inline kernel#Int#<= (var28,var29) */
-/* Covariant cast for argument 0 (i) <var29:Int> isa OTHER */
-/* <var29:Int> isa OTHER */
-var32 = 1; /* easy <var29:Int> isa OTHER*/
-if (!var32) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 256);
-exit(1);
+{
+{ /* Inline kernel#Int#!= (var_l,var8) on <var_l:Int> */
+var14 = var_l == var8;
+var15 = !var14;
+var12 = var15;
+goto RET_LABEL13;
+RET_LABEL13:(void)0;
 }
-var35 = var28 <= var29;
-var30 = var35;
-goto RET_LABEL31;
-RET_LABEL31:(void)0;
+var11 = var12;
 }
-var21 = var30;
+if (var11){
+var16 = 0;
+var = var16;
+goto RET_LABEL;
 } else {
-var21 = var_;
-}
-if (!var21) break;
-var36 = 1;
-{ /* Inline kernel#Int#+ (var_i,var36) */
-var39 = var_i + var36;
-var37 = var39;
-goto RET_LABEL38;
-RET_LABEL38:(void)0;
 }
-var_i = var37;
-CONTINUE_label: (void)0;
-}
-BREAK_label: (void)0;
+var17 = 0;
+var_i = var17;
+var18 = self->attrs[COLOR_array__Array___items].val; /* _items on <self:Array[nullable Object]> */
+var_it = var18;
+var19 = var_o->attrs[COLOR_array__Array___items].val; /* _items on <var_o:nullable Object(Array[nullable Object])> */
+var_oit = var19;
 for(;;) {
-{ /* Inline kernel#Int#> (var_j,var_i) */
-/* Covariant cast for argument 0 (i) <var_i:Int> isa OTHER */
-/* <var_i:Int> isa OTHER */
-var43 = 1; /* easy <var_i:Int> isa OTHER*/
-if (!var43) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 259);
-exit(1);
-}
-var46 = var_j > var_i;
-var41 = var46;
-goto RET_LABEL42;
-RET_LABEL42:(void)0;
+{
+{ /* Inline kernel#Int#< (var_i,var_l) on <var_i:Int> */
+/* Covariant cast for argument 0 (i) <var_l:Int> isa OTHER */
+/* <var_l:Int> isa OTHER */
+var22 = 1; /* easy <var_l:Int> isa OTHER*/
+if (unlikely(!var22)) {
+var_class_name = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 371);
+show_backtrace(1);
+}
+var25 = var_i < var_l;
+var20 = var25;
+goto RET_LABEL21;
+RET_LABEL21:(void)0;
 }
-var_47 = var41;
-if (var41){
-printf("NOT YET IMPLEMENTED AClosureCallExpr:lib/standard/collection/array.nit:386,21--39\n");
-/* var48 = NOT YET AClosureCallExpr */
-var49 = 0;
-{ /* Inline kernel#Int#>= (var48,var49) */
-/* Covariant cast for argument 0 (i) <var49:Int> isa OTHER */
-/* <var49:Int> isa OTHER */
-var52 = 1; /* easy <var49:Int> isa OTHER*/
-if (!var52) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 258);
-exit(1);
-}
-var55 = var48 >= var49;
-var50 = var55;
-goto RET_LABEL51;
-RET_LABEL51:(void)0;
 }
-var40 = var50;
+if (var20){
+if (var_it == NULL) {
+PRINT_ERROR("Runtime error: %s", "Receiver is null");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 368);
+show_backtrace(1);
 } else {
-var40 = var_47;
+{ /* Inline array#NativeArray#[] (var_it,var_i) on <var_it:nullable NativeArray[nullable Object]> */
+var28 = ((struct instance_array__NativeArray*)var_it)->values[var_i];
+var26 = var28;
+goto RET_LABEL27;
+RET_LABEL27:(void)0;
 }
-if (!var40) break;
-var56 = 1;
-{ /* Inline kernel#Int#- (var_j,var56) */
-var59 = var_j - var56;
-var57 = var59;
-goto RET_LABEL58;
-RET_LABEL58:(void)0;
 }
-var_j = var57;
-CONTINUE_label60: (void)0;
+if (var_oit == NULL) {
+PRINT_ERROR("Runtime error: %s", "Receiver is null");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 368);
+show_backtrace(1);
+} else {
+{ /* Inline array#NativeArray#[] (var_oit,var_i) on <var_oit:nullable NativeArray[nullable Object]> */
+var31 = ((struct instance_array__NativeArray*)var_oit)->values[var_i];
+var29 = var31;
+goto RET_LABEL30;
+RET_LABEL30:(void)0;
 }
-BREAK_label60: (void)0;
-{ /* Inline kernel#Int#> (var_j,var_i) */
-/* Covariant cast for argument 0 (i) <var_i:Int> isa OTHER */
-/* <var_i:Int> isa OTHER */
-var63 = 1; /* easy <var_i:Int> isa OTHER*/
-if (!var63) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 259);
-exit(1);
-}
-var66 = var_j > var_i;
-var61 = var66;
-goto RET_LABEL62;
-RET_LABEL62:(void)0;
 }
-if (var61){
-var67 = ((val* (*)(val*, long))(self->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(self, var_i) /* [] on <self:Array[nullable Object]>*/;
-var_t = var67;
-var68 = ((val* (*)(val*, long))(self->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(self, var_j) /* [] on <self:Array[nullable Object]>*/;
-((void (*)(val*, long, val*))(self->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(self, var_i, var68) /* []= on <self:Array[nullable Object]>*/;
-((void (*)(val*, long, val*))(self->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(self, var_j, var_t) /* []= on <self:Array[nullable Object]>*/;
+if (var26 == NULL) {
+var32 = (var29 != NULL);
 } else {
+var33 = ((short int (*)(val*, val*))(var26->class->vft[COLOR_kernel__Object___33d_61d]))(var26, var29) /* != on <var26:nullable Object>*/;
+var32 = var33;
 }
-CONTINUE_label69: (void)0;
-}
-BREAK_label69: (void)0;
-var70 = 1;
-{ /* Inline kernel#Int#- (var_i,var70) */
-var73 = var_i - var70;
-var71 = var73;
-goto RET_LABEL72;
-RET_LABEL72:(void)0;
-}
-var74 = ((val* (*)(val*, long))(self->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(self, var71) /* [] on <self:Array[nullable Object]>*/;
-((void (*)(val*, long, val*))(self->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(self, var_from, var74) /* []= on <self:Array[nullable Object]>*/;
-var75 = 1;
-{ /* Inline kernel#Int#- (var_i,var75) */
-var78 = var_i - var75;
-var76 = var78;
-goto RET_LABEL77;
-RET_LABEL77:(void)0;
-}
-((void (*)(val*, long, val*))(self->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(self, var76, var_pivot) /* []= on <self:Array[nullable Object]>*/;
-var79 = 2;
-{ /* Inline kernel#Int#- (var_i,var79) */
-var82 = var_i - var79;
-var80 = var82;
-goto RET_LABEL81;
-RET_LABEL81:(void)0;
-}
-((void (*)(val*, long, long))(self->class->vft[COLOR_array__Array__sub_sort]))(self, var_from, var80) /* sub_sort on <self:Array[nullable Object]>*/;
-((void (*)(val*, long, long))(self->class->vft[COLOR_array__Array__sub_sort]))(self, var_i, var_to) /* sub_sort on <self:Array[nullable Object]>*/;
-} else {
-var_i83 = var_from;
-for(;;) {
-{ /* Inline kernel#Int#< (var_i83,var_to) */
-/* Covariant cast for argument 0 (i) <var_to:Int> isa OTHER */
-/* <var_to:Int> isa OTHER */
-var86 = 1; /* easy <var_to:Int> isa OTHER*/
-if (!var86) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 257);
-exit(1);
-}
-var89 = var_i83 < var_to;
-var84 = var89;
-goto RET_LABEL85;
-RET_LABEL85:(void)0;
-}
-if (!var84) break;
-var_min = var_i83;
-var90 = ((val* (*)(val*, long))(self->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(self, var_i83) /* [] on <self:Array[nullable Object]>*/;
-var_min_v = var90;
-var_j91 = var_i83;
-for(;;) {
-{ /* Inline kernel#Int#<= (var_j91,var_to) */
-/* Covariant cast for argument 0 (i) <var_to:Int> isa OTHER */
-/* <var_to:Int> isa OTHER */
-var94 = 1; /* easy <var_to:Int> isa OTHER*/
-if (!var94) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 256);
-exit(1);
-}
-var97 = var_j91 <= var_to;
-var92 = var97;
-goto RET_LABEL93;
-RET_LABEL93:(void)0;
-}
-if (!var92) break;
-printf("NOT YET IMPLEMENTED AClosureCallExpr:lib/standard/collection/array.nit:404,9--27\n");
-/* var98 = NOT YET AClosureCallExpr */
-var99 = 0;
-{ /* Inline kernel#Int#> (var98,var99) */
-/* Covariant cast for argument 0 (i) <var99:Int> isa OTHER */
-/* <var99:Int> isa OTHER */
-var102 = 1; /* easy <var99:Int> isa OTHER*/
-if (!var102) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 259);
-exit(1);
-}
-var105 = var98 > var99;
-var100 = var105;
-goto RET_LABEL101;
-RET_LABEL101:(void)0;
-}
-if (var100){
-var_min = var_j91;
-var106 = ((val* (*)(val*, long))(self->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(self, var_j91) /* [] on <self:Array[nullable Object]>*/;
-var_min_v = var106;
+if (var32){
+var34 = 0;
+var = var34;
+goto RET_LABEL;
 } else {
 }
-var107 = 1;
-{ /* Inline kernel#Int#+ (var_j91,var107) */
-var110 = var_j91 + var107;
-var108 = var110;
-goto RET_LABEL109;
-RET_LABEL109:(void)0;
-}
-var_j91 = var108;
-CONTINUE_label111: (void)0;
-}
-BREAK_label111: (void)0;
-{ /* Inline kernel#Int#!= (var_min,var_i83) */
-var114 = var_min == var_i83;
-var115 = !var114;
-var112 = var115;
-goto RET_LABEL113;
-RET_LABEL113:(void)0;
-}
-if (var112){
-var116 = ((val* (*)(val*, long))(self->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(self, var_i83) /* [] on <self:Array[nullable Object]>*/;
-((void (*)(val*, long, val*))(self->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(self, var_min, var116) /* []= on <self:Array[nullable Object]>*/;
-((void (*)(val*, long, val*))(self->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(self, var_i83, var_min_v) /* []= on <self:Array[nullable Object]>*/;
-} else {
+var35 = 1;
+{
+{ /* Inline kernel#Int#+ (var_i,var35) on <var_i:Int> */
+/* Covariant cast for argument 0 (i) <var35:Int> isa OTHER */
+/* <var35:Int> isa OTHER */
+var38 = 1; /* easy <var35:Int> isa OTHER*/
+if (unlikely(!var38)) {
+var_class_name41 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name41);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 374);
+show_backtrace(1);
 }
-var117 = 1;
-{ /* Inline kernel#Int#+ (var_i83,var117) */
-var120 = var_i83 + var117;
-var118 = var120;
-goto RET_LABEL119;
-RET_LABEL119:(void)0;
+var42 = var_i + var35;
+var36 = var42;
+goto RET_LABEL37;
+RET_LABEL37:(void)0;
 }
-var_i83 = var118;
-CONTINUE_label121: (void)0;
 }
-BREAK_label121: (void)0;
+var_i = var36;
+} else {
+goto BREAK_label;
 }
 }
+BREAK_label: (void)0;
+var43 = 1;
+var = var43;
+goto RET_LABEL;
 RET_LABEL:;
+return var;
 }
-/* method array#Array#sub_sort for (self: Object, Int, Int) */
-void VIRTUAL_array__Array__sub_sort(val* self, long p0, long p1) {
-array__Array__sub_sort(self, p0, p1);
+/* method array#Array#== for (self: Object, nullable Object): Bool */
+short int VIRTUAL_array__Array___61d_61d(val* self, val* p0) {
+short int var /* : Bool */;
+short int var1 /* : Bool */;
+var1 = array__Array___61d_61d(self, p0);
+var = var1;
 RET_LABEL:;
+return var;
 }
 /* method array#ArrayIterator#item for (self: ArrayIterator[nullable Object]): nullable Object */
 val* array__ArrayIterator__item(val* self) {
@@ -2895,12 +3123,15 @@ val* var1 /* : AbstractArrayRead[nullable Object] */;
 long var2 /* : Int */;
 val* var3 /* : nullable Object */;
 var1 = self->attrs[COLOR_array__ArrayIterator___array].val; /* _array on <self:ArrayIterator[nullable Object]> */
-if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _array", "lib/standard/collection/array.nit", 424);
-exit(1);
+if (unlikely(var1 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _array");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 403);
+show_backtrace(1);
 }
 var2 = self->attrs[COLOR_array__ArrayIterator___index].l; /* _index on <self:ArrayIterator[nullable Object]> */
-var3 = ((val* (*)(val*, long))(var1->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(var1, var2) /* [] on <var1:AbstractArrayRead[nullable Object]>*/;
+{
+var3 = array__Array___91d_93d(var1, var2);
+}
 var = var3;
 goto RET_LABEL;
 RET_LABEL:;
@@ -2921,32 +3152,45 @@ short int var /* : Bool */;
 long var1 /* : Int */;
 val* var2 /* : AbstractArrayRead[nullable Object] */;
 long var3 /* : Int */;
-short int var4 /* : Bool */;
+long var5 /* : Int */;
 short int var6 /* : Bool */;
+short int var8 /* : Bool */;
 int cltype;
 int idtype;
-short int var7 /* : Bool */;
+const char* var_class_name;
+short int var9 /* : Bool */;
 var1 = self->attrs[COLOR_array__ArrayIterator___index].l; /* _index on <self:ArrayIterator[nullable Object]> */
 var2 = self->attrs[COLOR_array__ArrayIterator___array].val; /* _array on <self:ArrayIterator[nullable Object]> */
-if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _array", "lib/standard/collection/array.nit", 428);
-exit(1);
+if (unlikely(var2 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _array");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 407);
+show_backtrace(1);
+}
+{
+{ /* Inline array#AbstractArrayRead#length (var2) on <var2:AbstractArrayRead[nullable Object]> */
+var5 = var2->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <var2:AbstractArrayRead[nullable Object]> */
+var3 = var5;
+RET_LABEL4:(void)0;
+}
 }
-var3 = ((long (*)(val*))(var2->class->vft[COLOR_abstract_collection__Collection__length]))(var2) /* length on <var2:AbstractArrayRead[nullable Object]>*/;
-{ /* Inline kernel#Int#< (var1,var3) */
+{
+{ /* Inline kernel#Int#< (var1,var3) on <var1:Int> */
 /* Covariant cast for argument 0 (i) <var3:Int> isa OTHER */
 /* <var3:Int> isa OTHER */
-var6 = 1; /* easy <var3:Int> isa OTHER*/
-if (!var6) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 257);
-exit(1);
+var8 = 1; /* easy <var3:Int> isa OTHER*/
+if (unlikely(!var8)) {
+var_class_name = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 371);
+show_backtrace(1);
+}
+var9 = var1 < var3;
+var6 = var9;
+goto RET_LABEL7;
+RET_LABEL7:(void)0;
 }
-var7 = var1 < var3;
-var4 = var7;
-goto RET_LABEL5;
-RET_LABEL5:(void)0;
 }
-var = var4;
+var = var6;
 goto RET_LABEL;
 RET_LABEL:;
 return var;
@@ -2966,22 +3210,37 @@ val* var_ /* var : ArrayIterator[nullable Object] */;
 long var /* : Int */;
 long var1 /* : Int */;
 long var2 /* : Int */;
-long var4 /* : Int */;
+short int var4 /* : Bool */;
+int cltype;
+int idtype;
+const char* var_class_name;
+long var5 /* : Int */;
 var_ = self;
 var = var_->attrs[COLOR_array__ArrayIterator___index].l; /* _index on <var_:ArrayIterator[nullable Object]> */
 var1 = 1;
-{ /* Inline kernel#Int#+ (var,var1) */
-var4 = var + var1;
-var2 = var4;
+{
+{ /* Inline kernel#Int#+ (var,var1) on <var:Int> */
+/* Covariant cast for argument 0 (i) <var1:Int> isa OTHER */
+/* <var1:Int> isa OTHER */
+var4 = 1; /* easy <var1:Int> isa OTHER*/
+if (unlikely(!var4)) {
+var_class_name = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 374);
+show_backtrace(1);
+}
+var5 = var + var1;
+var2 = var5;
 goto RET_LABEL3;
 RET_LABEL3:(void)0;
 }
+}
 var_->attrs[COLOR_array__ArrayIterator___index].l = var2; /* _index on <var_:ArrayIterator[nullable Object]> */
 RET_LABEL:;
 }
 /* method array#ArrayIterator#next for (self: Object) */
 void VIRTUAL_array__ArrayIterator__next(val* self) {
-array__ArrayIterator__next(self);
+array__ArrayIterator__next(self); /* Direct call array#ArrayIterator#next on <self:Object(ArrayIterator[nullable Object])>*/
 RET_LABEL:;
 }
 /* method array#ArrayIterator#init for (self: ArrayIterator[nullable Object], AbstractArrayRead[nullable Object]) */
@@ -2990,10 +3249,11 @@ short int var /* : Bool */;
 int cltype;
 int idtype;
 const struct type* type_struct;
+const char* var_class_name;
 val* var_a /* var a: AbstractArrayRead[nullable Object] */;
 long var1 /* : Int */;
-/* Covariant cast for argument 0 (a) <p0:AbstractArrayRead[nullable Object]> isa AbstractArrayRead[ArrayIterator#0] */
-/* <p0:AbstractArrayRead[nullable Object]> isa AbstractArrayRead[ArrayIterator#0] */
+/* Covariant cast for argument 0 (a) <p0:AbstractArrayRead[nullable Object]> isa AbstractArrayRead[E] */
+/* <p0:AbstractArrayRead[nullable Object]> isa AbstractArrayRead[E] */
 type_struct = self->type->resolution_table->types[COLOR_array__AbstractArrayReadarray__ArrayIterator_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -3002,9 +3262,11 @@ var = 0;
 } else {
 var = p0->type->type_table[cltype] == idtype;
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 432);
-exit(1);
+if (unlikely(!var)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "AbstractArrayRead[E]", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 411);
+show_backtrace(1);
 }
 var_a = p0;
 self->attrs[COLOR_array__ArrayIterator___array].val = var_a; /* _array on <self:ArrayIterator[nullable Object]> */
@@ -3014,7 +3276,7 @@ RET_LABEL:;
 }
 /* method array#ArrayIterator#init for (self: Object, AbstractArrayRead[nullable Object]) */
 void VIRTUAL_array__ArrayIterator__init(val* self, val* p0) {
-array__ArrayIterator__init(self, p0);
+array__ArrayIterator__init(self, p0); /* Direct call array#ArrayIterator#init on <self:Object(ArrayIterator[nullable Object])>*/
 RET_LABEL:;
 }
 /* method array#ArrayIterator#index for (self: ArrayIterator[nullable Object]): Int */
@@ -3030,7 +3292,12 @@ return var;
 long VIRTUAL_array__ArrayIterator__index(val* self) {
 long var /* : Int */;
 long var1 /* : Int */;
-var1 = array__ArrayIterator__index(self);
+long var3 /* : Int */;
+{ /* Inline array#ArrayIterator#index (self) on <self:Object(ArrayIterator[nullable Object])> */
+var3 = self->attrs[COLOR_array__ArrayIterator___index].l; /* _index on <self:Object(ArrayIterator[nullable Object])> */
+var1 = var3;
+RET_LABEL2:(void)0;
+}
 var = var1;
 RET_LABEL:;
 return var;
@@ -3042,11 +3309,12 @@ short int var1 /* : Bool */;
 int cltype;
 int idtype;
 const struct type* type_struct;
+const char* var_class_name;
 val* var_e /* var e: Object */;
 val* var2 /* : Array[Object] */;
 short int var3 /* : Bool */;
-/* Covariant cast for argument 0 (e) <p0:Object> isa Collection#0 */
-/* <p0:Object> isa Collection#0 */
+/* Covariant cast for argument 0 (e) <p0:Object> isa E */
+/* <p0:Object> isa E */
 type_struct = self->type->resolution_table->types[COLOR_abstract_collection__Collection_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -3055,17 +3323,22 @@ var1 = 0;
 } else {
 var1 = p0->type->type_table[cltype] == idtype;
 }
-if (!var1) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 451);
-exit(1);
+if (unlikely(!var1)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "E", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 445);
+show_backtrace(1);
 }
 var_e = p0;
 var2 = self->attrs[COLOR_array__ArraySet___array].val; /* _array on <self:ArraySet[Object]> */
-if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _array", "lib/standard/collection/array.nit", 451);
-exit(1);
+if (unlikely(var2 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _array");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 445);
+show_backtrace(1);
+}
+{
+var3 = array__AbstractArrayRead__has(var2, var_e);
 }
-var3 = ((short int (*)(val*, val*))(var2->class->vft[COLOR_abstract_collection__Collection__has]))(var2, var_e) /* has on <var2:Array[Object]>*/;
 var = var3;
 goto RET_LABEL;
 RET_LABEL:;
@@ -3086,13 +3359,14 @@ short int var /* : Bool */;
 int cltype;
 int idtype;
 const struct type* type_struct;
+const char* var_class_name;
 val* var_e /* var e: Object */;
 val* var1 /* : Array[Object] */;
 short int var2 /* : Bool */;
 short int var3 /* : Bool */;
 val* var4 /* : Array[Object] */;
-/* Covariant cast for argument 0 (e) <p0:Object> isa SimpleCollection#0 */
-/* <p0:Object> isa SimpleCollection#0 */
+/* Covariant cast for argument 0 (e) <p0:Object> isa E */
+/* <p0:Object> isa E */
 type_struct = self->type->resolution_table->types[COLOR_abstract_collection__SimpleCollection_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -3101,32 +3375,40 @@ var = 0;
 } else {
 var = p0->type->type_table[cltype] == idtype;
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 453);
-exit(1);
+if (unlikely(!var)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "E", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 447);
+show_backtrace(1);
 }
 var_e = p0;
 var1 = self->attrs[COLOR_array__ArraySet___array].val; /* _array on <self:ArraySet[Object]> */
-if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _array", "lib/standard/collection/array.nit", 453);
-exit(1);
+if (unlikely(var1 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _array");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 447);
+show_backtrace(1);
+}
+{
+var2 = array__AbstractArrayRead__has(var1, var_e);
 }
-var2 = ((short int (*)(val*, val*))(var1->class->vft[COLOR_abstract_collection__Collection__has]))(var1, var_e) /* has on <var1:Array[Object]>*/;
 var3 = !var2;
 if (var3){
 var4 = self->attrs[COLOR_array__ArraySet___array].val; /* _array on <self:ArraySet[Object]> */
-if (var4 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _array", "lib/standard/collection/array.nit", 453);
-exit(1);
+if (unlikely(var4 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _array");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 447);
+show_backtrace(1);
+}
+{
+array__Array__add(var4, var_e); /* Direct call array#Array#add on <var4:Array[Object]>*/
 }
-((void (*)(val*, val*))(var4->class->vft[COLOR_abstract_collection__SimpleCollection__add]))(var4, var_e) /* add on <var4:Array[Object]>*/;
 } else {
 }
 RET_LABEL:;
 }
 /* method array#ArraySet#add for (self: Object, nullable Object) */
 void VIRTUAL_array__ArraySet__add(val* self, val* p0) {
-array__ArraySet__add(self, p0);
+array__ArraySet__add(self, p0); /* Direct call array#ArraySet#add on <self:Object(ArraySet[Object])>*/
 RET_LABEL:;
 }
 /* method array#ArraySet#is_empty for (self: ArraySet[Object]): Bool */
@@ -3135,11 +3417,14 @@ short int var /* : Bool */;
 val* var1 /* : Array[Object] */;
 short int var2 /* : Bool */;
 var1 = self->attrs[COLOR_array__ArraySet___array].val; /* _array on <self:ArraySet[Object]> */
-if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _array", "lib/standard/collection/array.nit", 455);
-exit(1);
+if (unlikely(var1 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _array");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 449);
+show_backtrace(1);
+}
+{
+var2 = array__AbstractArrayRead__is_empty(var1);
 }
-var2 = ((short int (*)(val*))(var1->class->vft[COLOR_abstract_collection__Collection__is_empty]))(var1) /* is_empty on <var1:Array[Object]>*/;
 var = var2;
 goto RET_LABEL;
 RET_LABEL:;
@@ -3159,12 +3444,20 @@ long array__ArraySet__length(val* self) {
 long var /* : Int */;
 val* var1 /* : Array[Object] */;
 long var2 /* : Int */;
+long var4 /* : Int */;
 var1 = self->attrs[COLOR_array__ArraySet___array].val; /* _array on <self:ArraySet[Object]> */
-if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _array", "lib/standard/collection/array.nit", 457);
-exit(1);
+if (unlikely(var1 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _array");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 451);
+show_backtrace(1);
+}
+{
+{ /* Inline array#AbstractArrayRead#length (var1) on <var1:Array[Object]> */
+var4 = var1->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <var1:Array[Object]> */
+var2 = var4;
+RET_LABEL3:(void)0;
+}
 }
-var2 = ((long (*)(val*))(var1->class->vft[COLOR_abstract_collection__Collection__length]))(var1) /* length on <var1:Array[Object]>*/;
 var = var2;
 goto RET_LABEL;
 RET_LABEL:;
@@ -3184,45 +3477,62 @@ val* array__ArraySet__first(val* self) {
 val* var /* : Object */;
 val* var1 /* : Array[Object] */;
 long var2 /* : Int */;
-long var3 /* : Int */;
-short int var4 /* : Bool */;
+long var4 /* : Int */;
+long var5 /* : Int */;
 short int var6 /* : Bool */;
+short int var8 /* : Bool */;
 int cltype;
 int idtype;
-short int var7 /* : Bool */;
-val* var8 /* : Array[Object] */;
-val* var9 /* : nullable Object */;
+const char* var_class_name;
+short int var9 /* : Bool */;
+val* var10 /* : Array[Object] */;
+val* var11 /* : nullable Object */;
 var1 = self->attrs[COLOR_array__ArraySet___array].val; /* _array on <self:ArraySet[Object]> */
-if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _array", "lib/standard/collection/array.nit", 461);
-exit(1);
+if (unlikely(var1 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _array");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 455);
+show_backtrace(1);
+}
+{
+{ /* Inline array#AbstractArrayRead#length (var1) on <var1:Array[Object]> */
+var4 = var1->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <var1:Array[Object]> */
+var2 = var4;
+RET_LABEL3:(void)0;
 }
-var2 = ((long (*)(val*))(var1->class->vft[COLOR_abstract_collection__Collection__length]))(var1) /* length on <var1:Array[Object]>*/;
-var3 = 0;
-{ /* Inline kernel#Int#> (var2,var3) */
-/* Covariant cast for argument 0 (i) <var3:Int> isa OTHER */
-/* <var3:Int> isa OTHER */
-var6 = 1; /* easy <var3:Int> isa OTHER*/
-if (!var6) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 259);
-exit(1);
 }
-var7 = var2 > var3;
-var4 = var7;
-goto RET_LABEL5;
-RET_LABEL5:(void)0;
+var5 = 0;
+{
+{ /* Inline kernel#Int#> (var2,var5) on <var2:Int> */
+/* Covariant cast for argument 0 (i) <var5:Int> isa OTHER */
+/* <var5:Int> isa OTHER */
+var8 = 1; /* easy <var5:Int> isa OTHER*/
+if (unlikely(!var8)) {
+var_class_name = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 373);
+show_backtrace(1);
+}
+var9 = var2 > var5;
+var6 = var9;
+goto RET_LABEL7;
+RET_LABEL7:(void)0;
+}
 }
-if (!var4) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Assert failed", "lib/standard/collection/array.nit", 461);
-exit(1);
+if (unlikely(!var6)) {
+PRINT_ERROR("Runtime error: %s", "Assert failed");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 455);
+show_backtrace(1);
 }
-var8 = self->attrs[COLOR_array__ArraySet___array].val; /* _array on <self:ArraySet[Object]> */
-if (var8 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _array", "lib/standard/collection/array.nit", 462);
-exit(1);
+var10 = self->attrs[COLOR_array__ArraySet___array].val; /* _array on <self:ArraySet[Object]> */
+if (unlikely(var10 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _array");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 456);
+show_backtrace(1);
 }
-var9 = ((val* (*)(val*))(var8->class->vft[COLOR_abstract_collection__Collection__first]))(var8) /* first on <var8:Array[Object]>*/;
-var = var9;
+{
+var11 = abstract_collection__SequenceRead__first(var10);
+}
+var = var11;
 goto RET_LABEL;
 RET_LABEL:;
 return var;
@@ -3242,6 +3552,7 @@ short int var /* : Bool */;
 int cltype;
 int idtype;
 const struct type* type_struct;
+const char* var_class_name;
 val* var_item /* var item: Object */;
 val* var1 /* : Array[Object] */;
 long var2 /* : Int */;
@@ -3251,9 +3562,10 @@ short int var4 /* : Bool */;
 short int var6 /* : Bool */;
 int cltype7;
 int idtype8;
-short int var9 /* : Bool */;
-/* Covariant cast for argument 0 (item) <p0:Object> isa RemovableCollection#0 */
-/* <p0:Object> isa RemovableCollection#0 */
+const char* var_class_name9;
+short int var10 /* : Bool */;
+/* Covariant cast for argument 0 (item) <p0:Object> isa E */
+/* <p0:Object> isa E */
 type_struct = self->type->resolution_table->types[COLOR_abstract_collection__RemovableCollection_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -3262,87 +3574,71 @@ var = 0;
 } else {
 var = p0->type->type_table[cltype] == idtype;
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 465);
-exit(1);
+if (unlikely(!var)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "E", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 459);
+show_backtrace(1);
 }
 var_item = p0;
 var1 = self->attrs[COLOR_array__ArraySet___array].val; /* _array on <self:ArraySet[Object]> */
-if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _array", "lib/standard/collection/array.nit", 467);
-exit(1);
+if (unlikely(var1 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _array");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 461);
+show_backtrace(1);
+}
+{
+var2 = array__AbstractArrayRead__index_of(var1, var_item);
 }
-var2 = ((long (*)(val*, val*))(var1->class->vft[COLOR_abstract_collection__SequenceRead__index_of]))(var1, var_item) /* index_of on <var1:Array[Object]>*/;
 var_i = var2;
 var3 = 0;
-{ /* Inline kernel#Int#>= (var_i,var3) */
+{
+{ /* Inline kernel#Int#>= (var_i,var3) on <var_i:Int> */
 /* Covariant cast for argument 0 (i) <var3:Int> isa OTHER */
 /* <var3:Int> isa OTHER */
 var6 = 1; /* easy <var3:Int> isa OTHER*/
-if (!var6) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 258);
-exit(1);
-}
-var9 = var_i >= var3;
-var4 = var9;
+if (unlikely(!var6)) {
+var_class_name9 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name9);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 372);
+show_backtrace(1);
+}
+var10 = var_i >= var3;
+var4 = var10;
 goto RET_LABEL5;
 RET_LABEL5:(void)0;
 }
+}
 if (var4){
-((void (*)(val*, long))(self->class->vft[COLOR_array__ArraySet__remove_at]))(self, var_i) /* remove_at on <self:ArraySet[Object]>*/;
+{
+array__ArraySet__remove_at(self, var_i); /* Direct call array#ArraySet#remove_at on <self:ArraySet[Object]>*/
+}
 } else {
 }
 RET_LABEL:;
 }
 /* method array#ArraySet#remove for (self: Object, nullable Object) */
 void VIRTUAL_array__ArraySet__remove(val* self, val* p0) {
-array__ArraySet__remove(self, p0);
-RET_LABEL:;
-}
-/* method array#ArraySet#remove_all for (self: ArraySet[Object], Object) */
-void array__ArraySet__remove_all(val* self, val* p0) {
-short int var /* : Bool */;
-int cltype;
-int idtype;
-const struct type* type_struct;
-val* var_item /* var item: Object */;
-/* Covariant cast for argument 0 (item) <p0:Object> isa RemovableCollection#0 */
-/* <p0:Object> isa RemovableCollection#0 */
-type_struct = self->type->resolution_table->types[COLOR_abstract_collection__RemovableCollection_FT0];
-cltype = type_struct->color;
-idtype = type_struct->id;
-if(cltype >= p0->type->table_size) {
-var = 0;
-} else {
-var = p0->type->type_table[cltype] == idtype;
-}
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 471);
-exit(1);
-}
-var_item = p0;
-((void (*)(val*, val*))(self->class->vft[COLOR_abstract_collection__RemovableCollection__remove]))(self, var_item) /* remove on <self:ArraySet[Object]>*/;
-RET_LABEL:;
-}
-/* method array#ArraySet#remove_all for (self: Object, nullable Object) */
-void VIRTUAL_array__ArraySet__remove_all(val* self, val* p0) {
-array__ArraySet__remove_all(self, p0);
+array__ArraySet__remove(self, p0); /* Direct call array#ArraySet#remove on <self:Object(ArraySet[Object])>*/
 RET_LABEL:;
 }
 /* method array#ArraySet#clear for (self: ArraySet[Object]) */
 void array__ArraySet__clear(val* self) {
 val* var /* : Array[Object] */;
 var = self->attrs[COLOR_array__ArraySet___array].val; /* _array on <self:ArraySet[Object]> */
-if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _array", "lib/standard/collection/array.nit", 473);
-exit(1);
+if (unlikely(var == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _array");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 467);
+show_backtrace(1);
+}
+{
+array__AbstractArray__clear(var); /* Direct call array#AbstractArray#clear on <var:Array[Object]>*/
 }
-((void (*)(val*))(var->class->vft[COLOR_abstract_collection__RemovableCollection__clear]))(var) /* clear on <var:Array[Object]>*/;
 RET_LABEL:;
 }
 /* method array#ArraySet#clear for (self: Object) */
 void VIRTUAL_array__ArraySet__clear(val* self) {
-array__ArraySet__clear(self);
+array__ArraySet__clear(self); /* Direct call array#ArraySet#clear on <self:Object(ArraySet[Object])>*/
 RET_LABEL:;
 }
 /* method array#ArraySet#iterator for (self: ArraySet[Object]): Iterator[Object] */
@@ -3350,16 +3646,20 @@ val* array__ArraySet__iterator(val* self) {
 val* var /* : Iterator[Object] */;
 val* var1 /* : ArraySetIterator[Object] */;
 val* var2 /* : Array[Object] */;
-val* var3 /* : Iterator[nullable Object] */;
+val* var3 /* : ArrayIterator[nullable Object] */;
 var1 = NEW_array__ArraySetIterator(self->type->resolution_table->types[COLOR_array__ArraySetIteratorarray__ArraySet_FT0]);
 var2 = self->attrs[COLOR_array__ArraySet___array].val; /* _array on <self:ArraySet[Object]> */
-if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _array", "lib/standard/collection/array.nit", 475);
-exit(1);
+if (unlikely(var2 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _array");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 469);
+show_backtrace(1);
+}
+{
+var3 = array__AbstractArrayRead__iterator(var2);
+}
+{
+array__ArraySetIterator__init(var1, var3); /* Direct call array#ArraySetIterator#init on <var1:ArraySetIterator[Object]>*/
 }
-var3 = ((val* (*)(val*))(var2->class->vft[COLOR_abstract_collection__Collection__iterator]))(var2) /* iterator on <var2:Array[Object]>*/;
-((void (*)(val*, val*))(var1->class->vft[COLOR_array__ArraySetIterator__init]))(var1, var3) /* init on <var1:ArraySetIterator[Object]>*/;
-CHECK_NEW_array__ArraySetIterator(var1);
 var = var1;
 goto RET_LABEL;
 RET_LABEL:;
@@ -3374,24 +3674,6 @@ var = var1;
 RET_LABEL:;
 return var;
 }
-/* method array#ArraySet#enlarge for (self: ArraySet[Object], Int) */
-void array__ArraySet__enlarge(val* self, long p0) {
-long var_cap /* var cap: Int */;
-val* var /* : Array[Object] */;
-var_cap = p0;
-var = self->attrs[COLOR_array__ArraySet___array].val; /* _array on <self:ArraySet[Object]> */
-if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _array", "lib/standard/collection/array.nit", 478);
-exit(1);
-}
-((void (*)(val*, long))(var->class->vft[COLOR_array__AbstractArray__enlarge]))(var, var_cap) /* enlarge on <var:Array[Object]>*/;
-RET_LABEL:;
-}
-/* method array#ArraySet#enlarge for (self: Object, Int) */
-void VIRTUAL_array__ArraySet__enlarge(val* self, long p0) {
-array__ArraySet__enlarge(self, p0);
-RET_LABEL:;
-}
 /* method array#ArraySet#remove_at for (self: ArraySet[Object], Int) */
 void array__ArraySet__remove_at(val* self, long p0) {
 long var_i /* var i: Int */;
@@ -3402,59 +3684,52 @@ val* var3 /* : Array[Object] */;
 val* var4 /* : nullable Object */;
 var_i = p0;
 var = self->attrs[COLOR_array__ArraySet___array].val; /* _array on <self:ArraySet[Object]> */
-if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _array", "lib/standard/collection/array.nit", 482);
-exit(1);
+if (unlikely(var == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _array");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 476);
+show_backtrace(1);
 }
 var1 = self->attrs[COLOR_array__ArraySet___array].val; /* _array on <self:ArraySet[Object]> */
-if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _array", "lib/standard/collection/array.nit", 482);
-exit(1);
+if (unlikely(var1 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _array");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 476);
+show_backtrace(1);
+}
+{
+var2 = abstract_collection__SequenceRead__last(var1);
+}
+{
+array__Array___91d_93d_61d(var, var_i, var2); /* Direct call array#Array#[]= on <var:Array[Object]>*/
 }
-var2 = ((val* (*)(val*))(var1->class->vft[COLOR_abstract_collection__SequenceRead__last]))(var1) /* last on <var1:Array[Object]>*/;
-((void (*)(val*, long, val*))(var->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(var, var_i, var2) /* []= on <var:Array[Object]>*/;
 var3 = self->attrs[COLOR_array__ArraySet___array].val; /* _array on <self:ArraySet[Object]> */
-if (var3 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _array", "lib/standard/collection/array.nit", 483);
-exit(1);
+if (unlikely(var3 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _array");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 477);
+show_backtrace(1);
+}
+{
+var4 = array__AbstractArray__pop(var3);
 }
-var4 = ((val* (*)(val*))(var3->class->vft[COLOR_abstract_collection__Sequence__pop]))(var3) /* pop on <var3:Array[Object]>*/;
-var4;
 RET_LABEL:;
 }
 /* method array#ArraySet#remove_at for (self: Object, Int) */
 void VIRTUAL_array__ArraySet__remove_at(val* self, long p0) {
-array__ArraySet__remove_at(self, p0);
+array__ArraySet__remove_at(self, p0); /* Direct call array#ArraySet#remove_at on <self:Object(ArraySet[Object])>*/
 RET_LABEL:;
 }
 /* method array#ArraySet#init for (self: ArraySet[Object]) */
 void array__ArraySet__init(val* self) {
 val* var /* : Array[Object] */;
 var = NEW_array__Array(self->type->resolution_table->types[COLOR_array__Arrayarray__ArraySet_FT0]);
-((void (*)(val*))(var->class->vft[COLOR_array__Array__init]))(var) /* init on <var:Array[Object]>*/;
-CHECK_NEW_array__Array(var);
+{
+((void (*)(val*))(var->class->vft[COLOR_kernel__Object__init]))(var) /* init on <var:Array[Object]>*/;
+}
 self->attrs[COLOR_array__ArraySet___array].val = var; /* _array on <self:ArraySet[Object]> */
 RET_LABEL:;
 }
 /* method array#ArraySet#init for (self: Object) */
 void VIRTUAL_array__ArraySet__init(val* self) {
-array__ArraySet__init(self);
-RET_LABEL:;
-}
-/* method array#ArraySet#with_capacity for (self: ArraySet[Object], Int) */
-void array__ArraySet__with_capacity(val* self, long p0) {
-long var_i /* var i: Int */;
-val* var /* : Array[Object] */;
-var_i = p0;
-var = NEW_array__Array(self->type->resolution_table->types[COLOR_array__Arrayarray__ArraySet_FT0]);
-((void (*)(val*, long))(var->class->vft[COLOR_array__Array__with_capacity]))(var, var_i) /* with_capacity on <var:Array[Object]>*/;
-CHECK_NEW_array__Array(var);
-self->attrs[COLOR_array__ArraySet___array].val = var; /* _array on <self:ArraySet[Object]> */
-RET_LABEL:;
-}
-/* method array#ArraySet#with_capacity for (self: Object, Int) */
-void VIRTUAL_array__ArraySet__with_capacity(val* self, long p0) {
-array__ArraySet__with_capacity(self, p0);
+array__ArraySet__init(self); /* Direct call array#ArraySet#init on <self:Object(ArraySet[Object])>*/
 RET_LABEL:;
 }
 /* method array#ArraySetIterator#is_ok for (self: ArraySetIterator[Object]): Bool */
@@ -3463,11 +3738,14 @@ short int var /* : Bool */;
 val* var1 /* : ArrayIterator[Object] */;
 short int var2 /* : Bool */;
 var1 = self->attrs[COLOR_array__ArraySetIterator___iter].val; /* _iter on <self:ArraySetIterator[Object]> */
-if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _iter", "lib/standard/collection/array.nit", 497);
-exit(1);
+if (unlikely(var1 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _iter");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 493);
+show_backtrace(1);
+}
+{
+var2 = array__ArrayIterator__is_ok(var1);
 }
-var2 = ((short int (*)(val*))(var1->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(var1) /* is_ok on <var1:ArrayIterator[Object]>*/;
 var = var2;
 goto RET_LABEL;
 RET_LABEL:;
@@ -3486,16 +3764,19 @@ return var;
 void array__ArraySetIterator__next(val* self) {
 val* var /* : ArrayIterator[Object] */;
 var = self->attrs[COLOR_array__ArraySetIterator___iter].val; /* _iter on <self:ArraySetIterator[Object]> */
-if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _iter", "lib/standard/collection/array.nit", 499);
-exit(1);
+if (unlikely(var == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _iter");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 495);
+show_backtrace(1);
+}
+{
+array__ArrayIterator__next(var); /* Direct call array#ArrayIterator#next on <var:ArrayIterator[Object]>*/
 }
-((void (*)(val*))(var->class->vft[COLOR_abstract_collection__Iterator__next]))(var) /* next on <var:ArrayIterator[Object]>*/;
 RET_LABEL:;
 }
 /* method array#ArraySetIterator#next for (self: Object) */
 void VIRTUAL_array__ArraySetIterator__next(val* self) {
-array__ArraySetIterator__next(self);
+array__ArraySetIterator__next(self); /* Direct call array#ArraySetIterator#next on <self:Object(ArraySetIterator[Object])>*/
 RET_LABEL:;
 }
 /* method array#ArraySetIterator#item for (self: ArraySetIterator[Object]): Object */
@@ -3504,11 +3785,14 @@ val* var /* : Object */;
 val* var1 /* : ArrayIterator[Object] */;
 val* var2 /* : nullable Object */;
 var1 = self->attrs[COLOR_array__ArraySetIterator___iter].val; /* _iter on <self:ArraySetIterator[Object]> */
-if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _iter", "lib/standard/collection/array.nit", 501);
-exit(1);
+if (unlikely(var1 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _iter");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 497);
+show_backtrace(1);
+}
+{
+var2 = array__ArrayIterator__item(var1);
 }
-var2 = ((val* (*)(val*))(var1->class->vft[COLOR_abstract_collection__Iterator__item]))(var1) /* item on <var1:ArrayIterator[Object]>*/;
 var = var2;
 goto RET_LABEL;
 RET_LABEL:;
@@ -3529,9 +3813,10 @@ short int var /* : Bool */;
 int cltype;
 int idtype;
 const struct type* type_struct;
+const char* var_class_name;
 val* var_iter /* var iter: ArrayIterator[Object] */;
-/* Covariant cast for argument 0 (iter) <p0:ArrayIterator[Object]> isa ArrayIterator[ArraySetIterator#0] */
-/* <p0:ArrayIterator[Object]> isa ArrayIterator[ArraySetIterator#0] */
+/* Covariant cast for argument 0 (iter) <p0:ArrayIterator[Object]> isa ArrayIterator[E] */
+/* <p0:ArrayIterator[Object]> isa ArrayIterator[E] */
 type_struct = self->type->resolution_table->types[COLOR_array__ArrayIteratorarray__ArraySetIterator_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -3540,9 +3825,11 @@ var = 0;
 } else {
 var = p0->type->type_table[cltype] == idtype;
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 503);
-exit(1);
+if (unlikely(!var)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "ArrayIterator[E]", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 499);
+show_backtrace(1);
 }
 var_iter = p0;
 self->attrs[COLOR_array__ArraySetIterator___iter].val = var_iter; /* _iter on <self:ArraySetIterator[Object]> */
@@ -3550,7 +3837,7 @@ RET_LABEL:;
 }
 /* method array#ArraySetIterator#init for (self: Object, ArrayIterator[Object]) */
 void VIRTUAL_array__ArraySetIterator__init(val* self, val* p0) {
-array__ArraySetIterator__init(self, p0);
+array__ArraySetIterator__init(self, p0); /* Direct call array#ArraySetIterator#init on <self:Object(ArraySetIterator[Object])>*/
 RET_LABEL:;
 }
 /* method array#ArrayMap#[] for (self: ArrayMap[Object, nullable Object], Object): nullable Object */
@@ -3560,6 +3847,7 @@ short int var1 /* : Bool */;
 int cltype;
 int idtype;
 const struct type* type_struct;
+const char* var_class_name;
 val* var_key /* var key: Object */;
 long var2 /* : Int */;
 long var_i /* var i: Int */;
@@ -3568,12 +3856,15 @@ short int var4 /* : Bool */;
 short int var6 /* : Bool */;
 int cltype7;
 int idtype8;
-short int var9 /* : Bool */;
-val* var10 /* : Array[Couple[Object, nullable Object]] */;
-val* var11 /* : nullable Object */;
+const char* var_class_name9;
+short int var10 /* : Bool */;
+val* var11 /* : Array[Couple[Object, nullable Object]] */;
 val* var12 /* : nullable Object */;
-/* Covariant cast for argument 0 (key) <p0:Object> isa MapRead#0 */
-/* <p0:Object> isa MapRead#0 */
+val* var13 /* : nullable Object */;
+val* var15 /* : nullable Object */;
+val* var16 /* : nullable Object */;
+/* Covariant cast for argument 0 (key) <p0:Object> isa K */
+/* <p0:Object> isa K */
 type_struct = self->type->resolution_table->types[COLOR_abstract_collection__MapRead_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -3582,40 +3873,60 @@ var1 = 0;
 } else {
 var1 = p0->type->type_table[cltype] == idtype;
 }
-if (!var1) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 513);
-exit(1);
+if (unlikely(!var1)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "K", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 509);
+show_backtrace(1);
 }
 var_key = p0;
-var2 = ((long (*)(val*, val*))(self->class->vft[COLOR_array__ArrayMap__index]))(self, var_key) /* index on <self:ArrayMap[Object, nullable Object]>*/;
+{
+var2 = array__ArrayMap__index(self, var_key);
+}
 var_i = var2;
 var3 = 0;
-{ /* Inline kernel#Int#>= (var_i,var3) */
+{
+{ /* Inline kernel#Int#>= (var_i,var3) on <var_i:Int> */
 /* Covariant cast for argument 0 (i) <var3:Int> isa OTHER */
 /* <var3:Int> isa OTHER */
 var6 = 1; /* easy <var3:Int> isa OTHER*/
-if (!var6) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 258);
-exit(1);
-}
-var9 = var_i >= var3;
-var4 = var9;
+if (unlikely(!var6)) {
+var_class_name9 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name9);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 372);
+show_backtrace(1);
+}
+var10 = var_i >= var3;
+var4 = var10;
 goto RET_LABEL5;
 RET_LABEL5:(void)0;
 }
+}
 if (var4){
-var10 = self->attrs[COLOR_array__ArrayMap___items].val; /* _items on <self:ArrayMap[Object, nullable Object]> */
-if (var10 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 518);
-exit(1);
+var11 = self->attrs[COLOR_array__ArrayMap___items].val; /* _items on <self:ArrayMap[Object, nullable Object]> */
+if (unlikely(var11 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _items");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 514);
+show_backtrace(1);
+}
+{
+var12 = array__Array___91d_93d(var11, var_i);
+}
+{
+{ /* Inline abstract_collection#Couple#second (var12) on <var12:nullable Object(Couple[Object, nullable Object])> */
+var15 = var12->attrs[COLOR_abstract_collection__Couple___second].val; /* _second on <var12:nullable Object(Couple[Object, nullable Object])> */
+var13 = var15;
+RET_LABEL14:(void)0;
+}
 }
-var11 = ((val* (*)(val*, long))(var10->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(var10, var_i) /* [] on <var10:Array[Couple[Object, nullable Object]]>*/;
-var12 = ((val* (*)(val*))(var11->class->vft[COLOR_abstract_collection__Couple__second]))(var11) /* second on <var11:nullable Object(Couple[Object, nullable Object])>*/;
-var = var12;
+var = var13;
 goto RET_LABEL;
 } else {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Aborted", "lib/standard/collection/array.nit", 520);
-exit(1);
+{
+var16 = abstract_collection__MapRead__provide_default_value(self, var_key);
+}
+var = var16;
+goto RET_LABEL;
 }
 RET_LABEL:;
 return var;
@@ -3635,27 +3946,36 @@ short int var /* : Bool */;
 int cltype;
 int idtype;
 const struct type* type_struct;
+const char* var_class_name;
 short int var1 /* : Bool */;
 int cltype2;
 int idtype3;
 const struct type* type_struct4;
 short int is_nullable;
+const char* var_class_name5;
 val* var_key /* var key: Object */;
 val* var_item /* var item: nullable Object */;
-long var5 /* : Int */;
-long var_i /* var i: Int */;
 long var6 /* : Int */;
-short int var7 /* : Bool */;
-short int var9 /* : Bool */;
-int cltype10;
-int idtype11;
-short int var12 /* : Bool */;
-val* var13 /* : Array[Couple[Object, nullable Object]] */;
-val* var14 /* : nullable Object */;
+long var_i /* var i: Int */;
+long var7 /* : Int */;
+short int var8 /* : Bool */;
+short int var10 /* : Bool */;
+int cltype11;
+int idtype12;
+const char* var_class_name13;
+short int var14 /* : Bool */;
 val* var15 /* : Array[Couple[Object, nullable Object]] */;
-val* var16 /* : Couple[Object, nullable Object] */;
-/* Covariant cast for argument 0 (key) <p0:Object> isa Map#0 */
-/* <p0:Object> isa Map#0 */
+val* var16 /* : nullable Object */;
+short int var18 /* : Bool */;
+int cltype19;
+int idtype20;
+const struct type* type_struct21;
+short int is_nullable22;
+const char* var_class_name23;
+val* var24 /* : Array[Couple[Object, nullable Object]] */;
+val* var25 /* : Couple[Object, nullable Object] */;
+/* Covariant cast for argument 0 (key) <p0:Object> isa K */
+/* <p0:Object> isa K */
 type_struct = self->type->resolution_table->types[COLOR_abstract_collection__Map_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -3664,12 +3984,14 @@ var = 0;
 } else {
 var = p0->type->type_table[cltype] == idtype;
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 524);
-exit(1);
+if (unlikely(!var)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "K", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 520);
+show_backtrace(1);
 }
-/* Covariant cast for argument 1 (item) <p1:nullable Object> isa Map#1 */
-/* <p1:nullable Object> isa Map#1 */
+/* Covariant cast for argument 1 (item) <p1:nullable Object> isa V */
+/* <p1:nullable Object> isa V */
 type_struct4 = self->type->resolution_table->types[COLOR_abstract_collection__Map_FT1];
 cltype2 = type_struct4->color;
 idtype3 = type_struct4->id;
@@ -3683,62 +4005,104 @@ var1 = 0;
 var1 = p1->type->type_table[cltype2] == idtype3;
 }
 }
-if (!var1) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 524);
-exit(1);
+if (unlikely(!var1)) {
+var_class_name5 = p1 == NULL ? "null" : p1->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "V", var_class_name5);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 520);
+show_backtrace(1);
 }
 var_key = p0;
 var_item = p1;
-var5 = ((long (*)(val*, val*))(self->class->vft[COLOR_array__ArrayMap__index]))(self, var_key) /* index on <self:ArrayMap[Object, nullable Object]>*/;
-var_i = var5;
-var6 = 0;
-{ /* Inline kernel#Int#>= (var_i,var6) */
-/* Covariant cast for argument 0 (i) <var6:Int> isa OTHER */
-/* <var6:Int> isa OTHER */
-var9 = 1; /* easy <var6:Int> isa OTHER*/
-if (!var9) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 258);
-exit(1);
+{
+var6 = array__ArrayMap__index(self, var_key);
 }
-var12 = var_i >= var6;
-var7 = var12;
-goto RET_LABEL8;
-RET_LABEL8:(void)0;
+var_i = var6;
+var7 = 0;
+{
+{ /* Inline kernel#Int#>= (var_i,var7) on <var_i:Int> */
+/* Covariant cast for argument 0 (i) <var7:Int> isa OTHER */
+/* <var7:Int> isa OTHER */
+var10 = 1; /* easy <var7:Int> isa OTHER*/
+if (unlikely(!var10)) {
+var_class_name13 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name13);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 372);
+show_backtrace(1);
+}
+var14 = var_i >= var7;
+var8 = var14;
+goto RET_LABEL9;
+RET_LABEL9:(void)0;
 }
-if (var7){
-var13 = self->attrs[COLOR_array__ArrayMap___items].val; /* _items on <self:ArrayMap[Object, nullable Object]> */
-if (var13 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 529);
-exit(1);
 }
-var14 = ((val* (*)(val*, long))(var13->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(var13, var_i) /* [] on <var13:Array[Couple[Object, nullable Object]]>*/;
-((void (*)(val*, val*))(var14->class->vft[COLOR_abstract_collection__Couple__second_61d]))(var14, var_item) /* second= on <var14:nullable Object(Couple[Object, nullable Object])>*/;
-} else {
+if (var8){
 var15 = self->attrs[COLOR_array__ArrayMap___items].val; /* _items on <self:ArrayMap[Object, nullable Object]> */
-if (var15 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 531);
-exit(1);
+if (unlikely(var15 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _items");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 525);
+show_backtrace(1);
+}
+{
+var16 = array__Array___91d_93d(var15, var_i);
+}
+{
+{ /* Inline abstract_collection#Couple#second= (var16,var_item) on <var16:nullable Object(Couple[Object, nullable Object])> */
+/* Covariant cast for argument 0 (second) <var_item:nullable Object> isa S */
+/* <var_item:nullable Object> isa S */
+type_struct21 = var16->type->resolution_table->types[COLOR_abstract_collection__Couple_FT1];
+cltype19 = type_struct21->color;
+idtype20 = type_struct21->id;
+is_nullable22 = type_struct21->is_nullable;
+if(var_item == NULL) {
+var18 = is_nullable22;
+} else {
+if(cltype19 >= var_item->type->table_size) {
+var18 = 0;
+} else {
+var18 = var_item->type->type_table[cltype19] == idtype20;
+}
+}
+if (unlikely(!var18)) {
+var_class_name23 = var_item == NULL ? "null" : var_item->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "S", var_class_name23);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/abstract_collection.nit", 965);
+show_backtrace(1);
+}
+var16->attrs[COLOR_abstract_collection__Couple___second].val = var_item; /* _second on <var16:nullable Object(Couple[Object, nullable Object])> */
+RET_LABEL17:(void)0;
+}
+}
+} else {
+var24 = self->attrs[COLOR_array__ArrayMap___items].val; /* _items on <self:ArrayMap[Object, nullable Object]> */
+if (unlikely(var24 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _items");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 527);
+show_backtrace(1);
+}
+var25 = NEW_abstract_collection__Couple(self->type->resolution_table->types[COLOR_abstract_collection__Couplearray__ArrayMap_FT0array__ArrayMap_FT1]);
+{
+abstract_collection__Couple__init(var25, var_key, var_item); /* Direct call abstract_collection#Couple#init on <var25:Couple[Object, nullable Object]>*/
+}
+{
+array__AbstractArray__push(var24, var25); /* Direct call array#AbstractArray#push on <var24:Array[Couple[Object, nullable Object]]>*/
 }
-var16 = NEW_abstract_collection__Couple(self->type->resolution_table->types[COLOR_abstract_collection__Couplearray__ArrayMap_FT0array__ArrayMap_FT1]);
-((void (*)(val*, val*, val*))(var16->class->vft[COLOR_abstract_collection__Couple__init]))(var16, var_key, var_item) /* init on <var16:Couple[Object, nullable Object]>*/;
-CHECK_NEW_abstract_collection__Couple(var16);
-((void (*)(val*, val*))(var15->class->vft[COLOR_abstract_collection__Sequence__push]))(var15, var16) /* push on <var15:Array[Couple[Object, nullable Object]]>*/;
 }
 RET_LABEL:;
 }
 /* method array#ArrayMap#[]= for (self: Object, Object, nullable Object) */
 void VIRTUAL_array__ArrayMap___91d_93d_61d(val* self, val* p0, val* p1) {
-array__ArrayMap___91d_93d_61d(self, p0, p1);
+array__ArrayMap___91d_93d_61d(self, p0, p1); /* Direct call array#ArrayMap#[]= on <self:Object(ArrayMap[Object, nullable Object])>*/
 RET_LABEL:;
 }
-/* method array#ArrayMap#keys for (self: ArrayMap[Object, nullable Object]): ArrayMapKeys[Object, nullable Object] */
+/* method array#ArrayMap#keys for (self: ArrayMap[Object, nullable Object]): RemovableCollection[Object] */
 val* array__ArrayMap__keys(val* self) {
-val* var /* : ArrayMapKeys[Object, nullable Object] */;
-val* var1 /* : ArrayMapKeys[Object, nullable Object] */;
-var1 = self->attrs[COLOR_array__ArrayMap___64dkeys].val; /* @keys on <self:ArrayMap[Object, nullable Object]> */
-if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute @keys", "lib/standard/collection/array.nit", 535);
-exit(1);
+val* var /* : RemovableCollection[Object] */;
+val* var1 /* : RemovableCollection[Object] */;
+var1 = self->attrs[COLOR_array__ArrayMap___keys].val; /* _keys on <self:ArrayMap[Object, nullable Object]> */
+if (unlikely(var1 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _keys");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 531);
+show_backtrace(1);
 }
 var = var1;
 RET_LABEL:;
@@ -3747,48 +4111,31 @@ return var;
 /* method array#ArrayMap#keys for (self: Object): Collection[Object] */
 val* VIRTUAL_array__ArrayMap__keys(val* self) {
 val* var /* : Collection[Object] */;
-val* var1 /* : ArrayMapKeys[Object, nullable Object] */;
-var1 = array__ArrayMap__keys(self);
-var = var1;
-RET_LABEL:;
-return var;
-}
-/* method array#ArrayMap#keys= for (self: ArrayMap[Object, nullable Object], ArrayMapKeys[Object, nullable Object]) */
-void array__ArrayMap__keys_61d(val* self, val* p0) {
-short int var /* : Bool */;
-int cltype;
-int idtype;
-const struct type* type_struct;
-/* Covariant cast for argument 0 (keys) <p0:ArrayMapKeys[Object, nullable Object]> isa ArrayMapKeys[ArrayMap#0, ArrayMap#1] */
-/* <p0:ArrayMapKeys[Object, nullable Object]> isa ArrayMapKeys[ArrayMap#0, ArrayMap#1] */
-type_struct = self->type->resolution_table->types[COLOR_array__ArrayMapKeysarray__ArrayMap_FT0array__ArrayMap_FT1];
-cltype = type_struct->color;
-idtype = type_struct->id;
-if(cltype >= p0->type->table_size) {
-var = 0;
-} else {
-var = p0->type->type_table[cltype] == idtype;
+val* var1 /* : RemovableCollection[Object] */;
+val* var3 /* : RemovableCollection[Object] */;
+{ /* Inline array#ArrayMap#keys (self) on <self:Object(ArrayMap[Object, nullable Object])> */
+var3 = self->attrs[COLOR_array__ArrayMap___keys].val; /* _keys on <self:Object(ArrayMap[Object, nullable Object])> */
+if (unlikely(var3 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _keys");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 531);
+show_backtrace(1);
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 535);
-exit(1);
-}
-self->attrs[COLOR_array__ArrayMap___64dkeys].val = p0; /* @keys on <self:ArrayMap[Object, nullable Object]> */
-RET_LABEL:;
+var1 = var3;
+RET_LABEL2:(void)0;
 }
-/* method array#ArrayMap#keys= for (self: Object, ArrayMapKeys[Object, nullable Object]) */
-void VIRTUAL_array__ArrayMap__keys_61d(val* self, val* p0) {
-array__ArrayMap__keys_61d(self, p0);
+var = var1;
 RET_LABEL:;
+return var;
 }
-/* method array#ArrayMap#values for (self: ArrayMap[Object, nullable Object]): ArrayMapValues[Object, nullable Object] */
+/* method array#ArrayMap#values for (self: ArrayMap[Object, nullable Object]): RemovableCollection[nullable Object] */
 val* array__ArrayMap__values(val* self) {
-val* var /* : ArrayMapValues[Object, nullable Object] */;
-val* var1 /* : ArrayMapValues[Object, nullable Object] */;
-var1 = self->attrs[COLOR_array__ArrayMap___64dvalues].val; /* @values on <self:ArrayMap[Object, nullable Object]> */
-if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute @values", "lib/standard/collection/array.nit", 536);
-exit(1);
+val* var /* : RemovableCollection[nullable Object] */;
+val* var1 /* : RemovableCollection[nullable Object] */;
+var1 = self->attrs[COLOR_array__ArrayMap___values].val; /* _values on <self:ArrayMap[Object, nullable Object]> */
+if (unlikely(var1 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _values");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 532);
+show_backtrace(1);
 }
 var = var1;
 RET_LABEL:;
@@ -3797,51 +4144,41 @@ return var;
 /* method array#ArrayMap#values for (self: Object): Collection[nullable Object] */
 val* VIRTUAL_array__ArrayMap__values(val* self) {
 val* var /* : Collection[nullable Object] */;
-val* var1 /* : ArrayMapValues[Object, nullable Object] */;
-var1 = array__ArrayMap__values(self);
-var = var1;
-RET_LABEL:;
-return var;
-}
-/* method array#ArrayMap#values= for (self: ArrayMap[Object, nullable Object], ArrayMapValues[Object, nullable Object]) */
-void array__ArrayMap__values_61d(val* self, val* p0) {
-short int var /* : Bool */;
-int cltype;
-int idtype;
-const struct type* type_struct;
-/* Covariant cast for argument 0 (values) <p0:ArrayMapValues[Object, nullable Object]> isa ArrayMapValues[ArrayMap#0, ArrayMap#1] */
-/* <p0:ArrayMapValues[Object, nullable Object]> isa ArrayMapValues[ArrayMap#0, ArrayMap#1] */
-type_struct = self->type->resolution_table->types[COLOR_array__ArrayMapValuesarray__ArrayMap_FT0array__ArrayMap_FT1];
-cltype = type_struct->color;
-idtype = type_struct->id;
-if(cltype >= p0->type->table_size) {
-var = 0;
-} else {
-var = p0->type->type_table[cltype] == idtype;
+val* var1 /* : RemovableCollection[nullable Object] */;
+val* var3 /* : RemovableCollection[nullable Object] */;
+{ /* Inline array#ArrayMap#values (self) on <self:Object(ArrayMap[Object, nullable Object])> */
+var3 = self->attrs[COLOR_array__ArrayMap___values].val; /* _values on <self:Object(ArrayMap[Object, nullable Object])> */
+if (unlikely(var3 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _values");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 532);
+show_backtrace(1);
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 536);
-exit(1);
-}
-self->attrs[COLOR_array__ArrayMap___64dvalues].val = p0; /* @values on <self:ArrayMap[Object, nullable Object]> */
-RET_LABEL:;
+var1 = var3;
+RET_LABEL2:(void)0;
 }
-/* method array#ArrayMap#values= for (self: Object, ArrayMapValues[Object, nullable Object]) */
-void VIRTUAL_array__ArrayMap__values_61d(val* self, val* p0) {
-array__ArrayMap__values_61d(self, p0);
+var = var1;
 RET_LABEL:;
+return var;
 }
 /* method array#ArrayMap#length for (self: ArrayMap[Object, nullable Object]): Int */
 long array__ArrayMap__length(val* self) {
 long var /* : Int */;
 val* var1 /* : Array[Couple[Object, nullable Object]] */;
 long var2 /* : Int */;
+long var4 /* : Int */;
 var1 = self->attrs[COLOR_array__ArrayMap___items].val; /* _items on <self:ArrayMap[Object, nullable Object]> */
-if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 539);
-exit(1);
+if (unlikely(var1 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _items");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 535);
+show_backtrace(1);
+}
+{
+{ /* Inline array#AbstractArrayRead#length (var1) on <var1:Array[Couple[Object, nullable Object]]> */
+var4 = var1->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <var1:Array[Couple[Object, nullable Object]]> */
+var2 = var4;
+RET_LABEL3:(void)0;
+}
 }
-var2 = ((long (*)(val*))(var1->class->vft[COLOR_abstract_collection__Collection__length]))(var1) /* length on <var1:Array[Couple[Object, nullable Object]]>*/;
 var = var2;
 goto RET_LABEL;
 RET_LABEL:;
@@ -3856,170 +4193,81 @@ var = var1;
 RET_LABEL:;
 return var;
 }
-/* method array#ArrayMap#iterator for (self: ArrayMap[Object, nullable Object]): CoupleMapIterator[Object, nullable Object] */
-val* array__ArrayMap__iterator(val* self) {
-val* var /* : CoupleMapIterator[Object, nullable Object] */;
-val* var1 /* : CoupleMapIterator[Object, nullable Object] */;
-val* var2 /* : Array[Couple[Object, nullable Object]] */;
-val* var3 /* : Iterator[nullable Object] */;
-var1 = NEW_abstract_collection__CoupleMapIterator(self->type->resolution_table->types[COLOR_abstract_collection__CoupleMapIteratorarray__ArrayMap_FT0array__ArrayMap_FT1]);
-var2 = self->attrs[COLOR_array__ArrayMap___items].val; /* _items on <self:ArrayMap[Object, nullable Object]> */
-if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 541);
-exit(1);
-}
-var3 = ((val* (*)(val*))(var2->class->vft[COLOR_abstract_collection__Collection__iterator]))(var2) /* iterator on <var2:Array[Couple[Object, nullable Object]]>*/;
-((void (*)(val*, val*))(var1->class->vft[COLOR_abstract_collection__CoupleMapIterator__init]))(var1, var3) /* init on <var1:CoupleMapIterator[Object, nullable Object]>*/;
-CHECK_NEW_abstract_collection__CoupleMapIterator(var1);
-var = var1;
-goto RET_LABEL;
-RET_LABEL:;
-return var;
-}
-/* method array#ArrayMap#iterator for (self: Object): MapIterator[Object, nullable Object] */
-val* VIRTUAL_array__ArrayMap__iterator(val* self) {
-val* var /* : MapIterator[Object, nullable Object] */;
-val* var1 /* : CoupleMapIterator[Object, nullable Object] */;
-var1 = array__ArrayMap__iterator(self);
-var = var1;
-RET_LABEL:;
-return var;
-}
-/* method array#ArrayMap#is_empty for (self: ArrayMap[Object, nullable Object]): Bool */
-short int array__ArrayMap__is_empty(val* self) {
-short int var /* : Bool */;
+/* method array#ArrayMap#couple_iterator for (self: ArrayMap[Object, nullable Object]): Iterator[Couple[Object, nullable Object]] */
+val* array__ArrayMap__couple_iterator(val* self) {
+val* var /* : Iterator[Couple[Object, nullable Object]] */;
 val* var1 /* : Array[Couple[Object, nullable Object]] */;
-short int var2 /* : Bool */;
+val* var2 /* : ArrayIterator[nullable Object] */;
 var1 = self->attrs[COLOR_array__ArrayMap___items].val; /* _items on <self:ArrayMap[Object, nullable Object]> */
-if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 543);
-exit(1);
+if (unlikely(var1 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _items");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 537);
+show_backtrace(1);
+}
+{
+var2 = array__AbstractArrayRead__iterator(var1);
 }
-var2 = ((short int (*)(val*))(var1->class->vft[COLOR_abstract_collection__Collection__is_empty]))(var1) /* is_empty on <var1:Array[Couple[Object, nullable Object]]>*/;
 var = var2;
 goto RET_LABEL;
 RET_LABEL:;
 return var;
 }
-/* method array#ArrayMap#is_empty for (self: Object): Bool */
-short int VIRTUAL_array__ArrayMap__is_empty(val* self) {
-short int var /* : Bool */;
-short int var1 /* : Bool */;
-var1 = array__ArrayMap__is_empty(self);
+/* method array#ArrayMap#couple_iterator for (self: Object): Iterator[Couple[Object, nullable Object]] */
+val* VIRTUAL_array__ArrayMap__couple_iterator(val* self) {
+val* var /* : Iterator[Couple[Object, nullable Object]] */;
+val* var1 /* : Iterator[Couple[Object, nullable Object]] */;
+var1 = array__ArrayMap__couple_iterator(self);
 var = var1;
 RET_LABEL:;
 return var;
 }
-/* method array#ArrayMap#clear for (self: ArrayMap[Object, nullable Object]) */
-void array__ArrayMap__clear(val* self) {
-val* var /* : Array[Couple[Object, nullable Object]] */;
-var = self->attrs[COLOR_array__ArrayMap___items].val; /* _items on <self:ArrayMap[Object, nullable Object]> */
-if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 545);
-exit(1);
-}
-((void (*)(val*))(var->class->vft[COLOR_abstract_collection__RemovableCollection__clear]))(var) /* clear on <var:Array[Couple[Object, nullable Object]]>*/;
-RET_LABEL:;
-}
-/* method array#ArrayMap#clear for (self: Object) */
-void VIRTUAL_array__ArrayMap__clear(val* self) {
-array__ArrayMap__clear(self);
-RET_LABEL:;
-}
-/* method array#ArrayMap#enlarge for (self: ArrayMap[Object, nullable Object], Int) */
-void array__ArrayMap__enlarge(val* self, long p0) {
-long var_cap /* var cap: Int */;
-val* var /* : Array[Couple[Object, nullable Object]] */;
-var_cap = p0;
-var = self->attrs[COLOR_array__ArrayMap___items].val; /* _items on <self:ArrayMap[Object, nullable Object]> */
-if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 548);
-exit(1);
-}
-((void (*)(val*, long))(var->class->vft[COLOR_array__AbstractArray__enlarge]))(var, var_cap) /* enlarge on <var:Array[Couple[Object, nullable Object]]>*/;
-RET_LABEL:;
-}
-/* method array#ArrayMap#enlarge for (self: Object, Int) */
-void VIRTUAL_array__ArrayMap__enlarge(val* self, long p0) {
-array__ArrayMap__enlarge(self, p0);
-RET_LABEL:;
-}
-/* method array#ArrayMap#couple_at for (self: ArrayMap[Object, nullable Object], Object): nullable Couple[Object, nullable Object] */
-val* array__ArrayMap__couple_at(val* self, val* p0) {
-val* var /* : nullable Couple[Object, nullable Object] */;
-short int var1 /* : Bool */;
-int cltype;
-int idtype;
-const struct type* type_struct;
-val* var_key /* var key: Object */;
-long var2 /* : Int */;
-long var_i /* var i: Int */;
-long var3 /* : Int */;
-short int var4 /* : Bool */;
-short int var6 /* : Bool */;
-int cltype7;
-int idtype8;
-short int var9 /* : Bool */;
-val* var10 /* : Array[Couple[Object, nullable Object]] */;
-val* var11 /* : nullable Object */;
-val* var12 /* : null */;
-/* Covariant cast for argument 0 (key) <p0:Object> isa CoupleMap#0 */
-/* <p0:Object> isa CoupleMap#0 */
-type_struct = self->type->resolution_table->types[COLOR_abstract_collection__CoupleMap_FT0];
-cltype = type_struct->color;
-idtype = type_struct->id;
-if(cltype >= p0->type->table_size) {
-var1 = 0;
-} else {
-var1 = p0->type->type_table[cltype] == idtype;
-}
-if (!var1) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 550);
-exit(1);
-}
-var_key = p0;
-var2 = ((long (*)(val*, val*))(self->class->vft[COLOR_array__ArrayMap__index]))(self, var_key) /* index on <self:ArrayMap[Object, nullable Object]>*/;
-var_i = var2;
-var3 = 0;
-{ /* Inline kernel#Int#>= (var_i,var3) */
-/* Covariant cast for argument 0 (i) <var3:Int> isa OTHER */
-/* <var3:Int> isa OTHER */
-var6 = 1; /* easy <var3:Int> isa OTHER*/
-if (!var6) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 258);
-exit(1);
-}
-var9 = var_i >= var3;
-var4 = var9;
-goto RET_LABEL5;
-RET_LABEL5:(void)0;
+/* method array#ArrayMap#is_empty for (self: ArrayMap[Object, nullable Object]): Bool */
+short int array__ArrayMap__is_empty(val* self) {
+short int var /* : Bool */;
+val* var1 /* : Array[Couple[Object, nullable Object]] */;
+short int var2 /* : Bool */;
+var1 = self->attrs[COLOR_array__ArrayMap___items].val; /* _items on <self:ArrayMap[Object, nullable Object]> */
+if (unlikely(var1 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _items");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 539);
+show_backtrace(1);
 }
-if (var4){
-var10 = self->attrs[COLOR_array__ArrayMap___items].val; /* _items on <self:ArrayMap[Object, nullable Object]> */
-if (var10 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 554);
-exit(1);
+{
+var2 = array__AbstractArrayRead__is_empty(var1);
 }
-var11 = ((val* (*)(val*, long))(var10->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(var10, var_i) /* [] on <var10:Array[Couple[Object, nullable Object]]>*/;
-var = var11;
-goto RET_LABEL;
-} else {
-var12 = NULL;
-var = var12;
+var = var2;
 goto RET_LABEL;
-}
 RET_LABEL:;
 return var;
 }
-/* method array#ArrayMap#couple_at for (self: Object, Object): nullable Couple[Object, nullable Object] */
-val* VIRTUAL_array__ArrayMap__couple_at(val* self, val* p0) {
-val* var /* : nullable Couple[Object, nullable Object] */;
-val* var1 /* : nullable Couple[Object, nullable Object] */;
-var1 = array__ArrayMap__couple_at(self, p0);
+/* method array#ArrayMap#is_empty for (self: Object): Bool */
+short int VIRTUAL_array__ArrayMap__is_empty(val* self) {
+short int var /* : Bool */;
+short int var1 /* : Bool */;
+var1 = array__ArrayMap__is_empty(self);
 var = var1;
 RET_LABEL:;
 return var;
 }
+/* method array#ArrayMap#clear for (self: ArrayMap[Object, nullable Object]) */
+void array__ArrayMap__clear(val* self) {
+val* var /* : Array[Couple[Object, nullable Object]] */;
+var = self->attrs[COLOR_array__ArrayMap___items].val; /* _items on <self:ArrayMap[Object, nullable Object]> */
+if (unlikely(var == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _items");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 541);
+show_backtrace(1);
+}
+{
+array__AbstractArray__clear(var); /* Direct call array#AbstractArray#clear on <var:Array[Couple[Object, nullable Object]]>*/
+}
+RET_LABEL:;
+}
+/* method array#ArrayMap#clear for (self: Object) */
+void VIRTUAL_array__ArrayMap__clear(val* self) {
+array__ArrayMap__clear(self); /* Direct call array#ArrayMap#clear on <self:Object(ArrayMap[Object, nullable Object])>*/
+RET_LABEL:;
+}
 /* method array#ArrayMap#remove_at_index for (self: ArrayMap[Object, nullable Object], Int) */
 void array__ArrayMap__remove_at_index(val* self, long p0) {
 long var_i /* var i: Int */;
@@ -4030,29 +4278,37 @@ val* var3 /* : Array[Couple[Object, nullable Object]] */;
 val* var4 /* : nullable Object */;
 var_i = p0;
 var = self->attrs[COLOR_array__ArrayMap___items].val; /* _items on <self:ArrayMap[Object, nullable Object]> */
-if (var == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 566);
-exit(1);
+if (unlikely(var == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _items");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 562);
+show_backtrace(1);
 }
 var1 = self->attrs[COLOR_array__ArrayMap___items].val; /* _items on <self:ArrayMap[Object, nullable Object]> */
-if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 566);
-exit(1);
+if (unlikely(var1 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _items");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 562);
+show_backtrace(1);
+}
+{
+var2 = abstract_collection__SequenceRead__last(var1);
+}
+{
+array__Array___91d_93d_61d(var, var_i, var2); /* Direct call array#Array#[]= on <var:Array[Couple[Object, nullable Object]]>*/
 }
-var2 = ((val* (*)(val*))(var1->class->vft[COLOR_abstract_collection__SequenceRead__last]))(var1) /* last on <var1:Array[Couple[Object, nullable Object]]>*/;
-((void (*)(val*, long, val*))(var->class->vft[COLOR_abstract_collection__Sequence___91d_93d_61d]))(var, var_i, var2) /* []= on <var:Array[Couple[Object, nullable Object]]>*/;
 var3 = self->attrs[COLOR_array__ArrayMap___items].val; /* _items on <self:ArrayMap[Object, nullable Object]> */
-if (var3 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 567);
-exit(1);
+if (unlikely(var3 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _items");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 563);
+show_backtrace(1);
+}
+{
+var4 = array__AbstractArray__pop(var3);
 }
-var4 = ((val* (*)(val*))(var3->class->vft[COLOR_abstract_collection__Sequence__pop]))(var3) /* pop on <var3:Array[Couple[Object, nullable Object]]>*/;
-var4;
 RET_LABEL:;
 }
 /* method array#ArrayMap#remove_at_index for (self: Object, Int) */
 void VIRTUAL_array__ArrayMap__remove_at_index(val* self, long p0) {
-array__ArrayMap__remove_at_index(self, p0);
+array__ArrayMap__remove_at_index(self, p0); /* Direct call array#ArrayMap#remove_at_index on <self:Object(ArrayMap[Object, nullable Object])>*/
 RET_LABEL:;
 }
 /* method array#ArrayMap#index for (self: ArrayMap[Object, nullable Object], Object): Int */
@@ -4062,43 +4318,56 @@ short int var1 /* : Bool */;
 int cltype;
 int idtype;
 const struct type* type_struct;
+const char* var_class_name;
 val* var_key /* var key: Object */;
 long var2 /* : Int */;
 long var_l /* var l: Int */;
 short int var3 /* : Bool */;
 val* var4 /* : Array[Couple[Object, nullable Object]] */;
 long var5 /* : Int */;
-short int var6 /* : Bool */;
+long var7 /* : Int */;
 short int var8 /* : Bool */;
-int cltype9;
-int idtype10;
-short int var11 /* : Bool */;
+short int var10 /* : Bool */;
+int cltype11;
+int idtype12;
+const char* var_class_name13;
+short int var14 /* : Bool */;
 short int var_ /* var : Bool */;
-val* var12 /* : Array[Couple[Object, nullable Object]] */;
-val* var13 /* : nullable Object */;
-val* var14 /* : nullable Object */;
-short int var15 /* : Bool */;
-long var16 /* : Int */;
-long var_i /* var i: Int */;
-val* var17 /* : Array[Couple[Object, nullable Object]] */;
-long var18 /* : Int */;
-short int var19 /* : Bool */;
+val* var15 /* : Array[Couple[Object, nullable Object]] */;
+val* var16 /* : nullable Object */;
+val* var17 /* : nullable Object */;
+val* var19 /* : nullable Object */;
+short int var20 /* : Bool */;
 short int var21 /* : Bool */;
-int cltype22;
-int idtype23;
-short int var24 /* : Bool */;
-val* var25 /* : Array[Couple[Object, nullable Object]] */;
-val* var26 /* : nullable Object */;
-val* var27 /* : nullable Object */;
-short int var28 /* : Bool */;
-long var29 /* : Int */;
-long var30 /* : Int */;
-long var32 /* : Int */;
-long var33 /* : Int */;
-long var34 /* : Int */;
-long var36 /* : Int */;
-/* Covariant cast for argument 0 (key) <p0:Object> isa ArrayMap#0 */
-/* <p0:Object> isa ArrayMap#0 */
+long var22 /* : Int */;
+long var_i /* var i: Int */;
+val* var23 /* : Array[Couple[Object, nullable Object]] */;
+long var24 /* : Int */;
+long var26 /* : Int */;
+short int var27 /* : Bool */;
+short int var29 /* : Bool */;
+int cltype30;
+int idtype31;
+const char* var_class_name32;
+short int var33 /* : Bool */;
+val* var34 /* : Array[Couple[Object, nullable Object]] */;
+val* var35 /* : nullable Object */;
+val* var36 /* : nullable Object */;
+val* var38 /* : nullable Object */;
+short int var39 /* : Bool */;
+short int var40 /* : Bool */;
+long var41 /* : Int */;
+long var42 /* : Int */;
+short int var44 /* : Bool */;
+int cltype45;
+int idtype46;
+const char* var_class_name47;
+long var48 /* : Int */;
+long var49 /* : Int */;
+long var50 /* : Int */;
+long var52 /* : Int */;
+/* Covariant cast for argument 0 (key) <p0:Object> isa K */
+/* <p0:Object> isa K */
 type_struct = self->type->resolution_table->types[COLOR_array__ArrayMap_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -4107,43 +4376,68 @@ var1 = 0;
 } else {
 var1 = p0->type->type_table[cltype] == idtype;
 }
-if (!var1) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 573);
-exit(1);
+if (unlikely(!var1)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "K", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 569);
+show_backtrace(1);
 }
 var_key = p0;
 var2 = self->attrs[COLOR_array__ArrayMap___last_index].l; /* _last_index on <self:ArrayMap[Object, nullable Object]> */
 var_l = var2;
 var4 = self->attrs[COLOR_array__ArrayMap___items].val; /* _items on <self:ArrayMap[Object, nullable Object]> */
-if (var4 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 578);
-exit(1);
+if (unlikely(var4 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _items");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 574);
+show_backtrace(1);
+}
+{
+{ /* Inline array#AbstractArrayRead#length (var4) on <var4:Array[Couple[Object, nullable Object]]> */
+var7 = var4->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <var4:Array[Couple[Object, nullable Object]]> */
+var5 = var7;
+RET_LABEL6:(void)0;
+}
 }
-var5 = ((long (*)(val*))(var4->class->vft[COLOR_abstract_collection__Collection__length]))(var4) /* length on <var4:Array[Couple[Object, nullable Object]]>*/;
-{ /* Inline kernel#Int#< (var_l,var5) */
+{
+{ /* Inline kernel#Int#< (var_l,var5) on <var_l:Int> */
 /* Covariant cast for argument 0 (i) <var5:Int> isa OTHER */
 /* <var5:Int> isa OTHER */
-var8 = 1; /* easy <var5:Int> isa OTHER*/
-if (!var8) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 257);
-exit(1);
+var10 = 1; /* easy <var5:Int> isa OTHER*/
+if (unlikely(!var10)) {
+var_class_name13 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name13);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 371);
+show_backtrace(1);
+}
+var14 = var_l < var5;
+var8 = var14;
+goto RET_LABEL9;
+RET_LABEL9:(void)0;
 }
-var11 = var_l < var5;
-var6 = var11;
-goto RET_LABEL7;
-RET_LABEL7:(void)0;
 }
-var_ = var6;
-if (var6){
-var12 = self->attrs[COLOR_array__ArrayMap___items].val; /* _items on <self:ArrayMap[Object, nullable Object]> */
-if (var12 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 578);
-exit(1);
+var_ = var8;
+if (var8){
+var15 = self->attrs[COLOR_array__ArrayMap___items].val; /* _items on <self:ArrayMap[Object, nullable Object]> */
+if (unlikely(var15 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _items");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 574);
+show_backtrace(1);
+}
+{
+var16 = array__Array___91d_93d(var15, var_l);
+}
+{
+{ /* Inline abstract_collection#Couple#first (var16) on <var16:nullable Object(Couple[Object, nullable Object])> */
+var19 = var16->attrs[COLOR_abstract_collection__Couple___first].val; /* _first on <var16:nullable Object(Couple[Object, nullable Object])> */
+var17 = var19;
+RET_LABEL18:(void)0;
+}
 }
-var13 = ((val* (*)(val*, long))(var12->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(var12, var_l) /* [] on <var12:Array[Couple[Object, nullable Object]]>*/;
-var14 = ((val* (*)(val*))(var13->class->vft[COLOR_abstract_collection__Couple__first]))(var13) /* first on <var13:nullable Object(Couple[Object, nullable Object])>*/;
-var15 = ((short int (*)(val*, val*))(var14->class->vft[COLOR_kernel__Object___61d_61d]))(var14, var_key) /* == on <var14:nullable Object(Object)>*/;
-var3 = var15;
+{
+var21 = ((short int (*)(val*, val*))(var17->class->vft[COLOR_kernel__Object___61d_61d]))(var17, var_key) /* == on <var17:nullable Object(Object)>*/;
+var20 = var21;
+}
+var3 = var20;
 } else {
 var3 = var_;
 }
@@ -4152,62 +4446,100 @@ var = var_l;
 goto RET_LABEL;
 } else {
 }
-var16 = 0;
-var_i = var16;
+var22 = 0;
+var_i = var22;
 for(;;) {
-var17 = self->attrs[COLOR_array__ArrayMap___items].val; /* _items on <self:ArrayMap[Object, nullable Object]> */
-if (var17 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 581);
-exit(1);
+var23 = self->attrs[COLOR_array__ArrayMap___items].val; /* _items on <self:ArrayMap[Object, nullable Object]> */
+if (unlikely(var23 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _items");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 577);
+show_backtrace(1);
+}
+{
+{ /* Inline array#AbstractArrayRead#length (var23) on <var23:Array[Couple[Object, nullable Object]]> */
+var26 = var23->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <var23:Array[Couple[Object, nullable Object]]> */
+var24 = var26;
+RET_LABEL25:(void)0;
 }
-var18 = ((long (*)(val*))(var17->class->vft[COLOR_abstract_collection__Collection__length]))(var17) /* length on <var17:Array[Couple[Object, nullable Object]]>*/;
-{ /* Inline kernel#Int#< (var_i,var18) */
-/* Covariant cast for argument 0 (i) <var18:Int> isa OTHER */
-/* <var18:Int> isa OTHER */
-var21 = 1; /* easy <var18:Int> isa OTHER*/
-if (!var21) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 257);
-exit(1);
 }
-var24 = var_i < var18;
-var19 = var24;
-goto RET_LABEL20;
-RET_LABEL20:(void)0;
+{
+{ /* Inline kernel#Int#< (var_i,var24) on <var_i:Int> */
+/* Covariant cast for argument 0 (i) <var24:Int> isa OTHER */
+/* <var24:Int> isa OTHER */
+var29 = 1; /* easy <var24:Int> isa OTHER*/
+if (unlikely(!var29)) {
+var_class_name32 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name32);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 371);
+show_backtrace(1);
+}
+var33 = var_i < var24;
+var27 = var33;
+goto RET_LABEL28;
+RET_LABEL28:(void)0;
+}
+}
+if (var27){
+var34 = self->attrs[COLOR_array__ArrayMap___items].val; /* _items on <self:ArrayMap[Object, nullable Object]> */
+if (unlikely(var34 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _items");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 578);
+show_backtrace(1);
+}
+{
+var35 = array__Array___91d_93d(var34, var_i);
+}
+{
+{ /* Inline abstract_collection#Couple#first (var35) on <var35:nullable Object(Couple[Object, nullable Object])> */
+var38 = var35->attrs[COLOR_abstract_collection__Couple___first].val; /* _first on <var35:nullable Object(Couple[Object, nullable Object])> */
+var36 = var38;
+RET_LABEL37:(void)0;
 }
-if (!var19) break;
-var25 = self->attrs[COLOR_array__ArrayMap___items].val; /* _items on <self:ArrayMap[Object, nullable Object]> */
-if (var25 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 582);
-exit(1);
 }
-var26 = ((val* (*)(val*, long))(var25->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(var25, var_i) /* [] on <var25:Array[Couple[Object, nullable Object]]>*/;
-var27 = ((val* (*)(val*))(var26->class->vft[COLOR_abstract_collection__Couple__first]))(var26) /* first on <var26:nullable Object(Couple[Object, nullable Object])>*/;
-var28 = ((short int (*)(val*, val*))(var27->class->vft[COLOR_kernel__Object___61d_61d]))(var27, var_key) /* == on <var27:nullable Object(Object)>*/;
-if (var28){
+{
+var40 = ((short int (*)(val*, val*))(var36->class->vft[COLOR_kernel__Object___61d_61d]))(var36, var_key) /* == on <var36:nullable Object(Object)>*/;
+var39 = var40;
+}
+if (var39){
 self->attrs[COLOR_array__ArrayMap___last_index].l = var_i; /* _last_index on <self:ArrayMap[Object, nullable Object]> */
 var = var_i;
 goto RET_LABEL;
 } else {
 }
-var29 = 1;
-{ /* Inline kernel#Int#+ (var_i,var29) */
-var32 = var_i + var29;
-var30 = var32;
-goto RET_LABEL31;
-RET_LABEL31:(void)0;
+var41 = 1;
+{
+{ /* Inline kernel#Int#+ (var_i,var41) on <var_i:Int> */
+/* Covariant cast for argument 0 (i) <var41:Int> isa OTHER */
+/* <var41:Int> isa OTHER */
+var44 = 1; /* easy <var41:Int> isa OTHER*/
+if (unlikely(!var44)) {
+var_class_name47 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name47);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 374);
+show_backtrace(1);
+}
+var48 = var_i + var41;
+var42 = var48;
+goto RET_LABEL43;
+RET_LABEL43:(void)0;
+}
+}
+var_i = var42;
+} else {
+goto BREAK_label;
 }
-var_i = var30;
-CONTINUE_label: (void)0;
 }
 BREAK_label: (void)0;
-var33 = 1;
-{ /* Inline kernel#Int#unary - (var33) */
-var36 = -var33;
-var34 = var36;
-goto RET_LABEL35;
-RET_LABEL35:(void)0;
+var49 = 1;
+{
+{ /* Inline kernel#Int#unary - (var49) on <var49:Int> */
+var52 = -var49;
+var50 = var52;
+goto RET_LABEL51;
+RET_LABEL51:(void)0;
 }
-var = var34;
+}
+var = var50;
 goto RET_LABEL;
 RET_LABEL:;
 return var;
@@ -4221,28 +4553,15 @@ var = var1;
 RET_LABEL:;
 return var;
 }
-/* method array#ArrayMap#init for (self: ArrayMap[Object, nullable Object]) */
-void array__ArrayMap__init(val* self) {
-val* var /* : Array[Couple[Object, nullable Object]] */;
-var = NEW_array__Array(self->type->resolution_table->types[COLOR_array__Arrayabstract_collection__Couplearray__ArrayMap_FT0array__ArrayMap_FT1]);
-((void (*)(val*))(var->class->vft[COLOR_array__Array__init]))(var) /* init on <var:Array[Couple[Object, nullable Object]]>*/;
-CHECK_NEW_array__Array(var);
-self->attrs[COLOR_array__ArrayMap___items].val = var; /* _items on <self:ArrayMap[Object, nullable Object]> */
-RET_LABEL:;
-}
-/* method array#ArrayMap#init for (self: Object) */
-void VIRTUAL_array__ArrayMap__init(val* self) {
-array__ArrayMap__init(self);
-RET_LABEL:;
-}
 /* method array#ArrayMapKeys#map for (self: ArrayMapKeys[Object, nullable Object]): ArrayMap[Object, nullable Object] */
 val* array__ArrayMapKeys__map(val* self) {
 val* var /* : ArrayMap[Object, nullable Object] */;
 val* var1 /* : ArrayMap[Object, nullable Object] */;
-var1 = self->attrs[COLOR_array__ArrayMapKeys___64dmap].val; /* @map on <self:ArrayMapKeys[Object, nullable Object]> */
-if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute @map", "lib/standard/collection/array.nit", 600);
-exit(1);
+var1 = self->attrs[COLOR_array__ArrayMapKeys___map].val; /* _map on <self:ArrayMapKeys[Object, nullable Object]> */
+if (unlikely(var1 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _map");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 590);
+show_backtrace(1);
 }
 var = var1;
 RET_LABEL:;
@@ -4252,7 +4571,17 @@ return var;
 val* VIRTUAL_array__ArrayMapKeys__map(val* self) {
 val* var /* : ArrayMap[Object, nullable Object] */;
 val* var1 /* : ArrayMap[Object, nullable Object] */;
-var1 = array__ArrayMapKeys__map(self);
+val* var3 /* : ArrayMap[Object, nullable Object] */;
+{ /* Inline array#ArrayMapKeys#map (self) on <self:Object(ArrayMapKeys[Object, nullable Object])> */
+var3 = self->attrs[COLOR_array__ArrayMapKeys___map].val; /* _map on <self:Object(ArrayMapKeys[Object, nullable Object])> */
+if (unlikely(var3 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _map");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 590);
+show_backtrace(1);
+}
+var1 = var3;
+RET_LABEL2:(void)0;
+}
 var = var1;
 RET_LABEL:;
 return var;
@@ -4263,8 +4592,9 @@ short int var /* : Bool */;
 int cltype;
 int idtype;
 const struct type* type_struct;
-/* Covariant cast for argument 0 (map) <p0:ArrayMap[Object, nullable Object]> isa ArrayMap[ArrayMapKeys#0, ArrayMapKeys#1] */
-/* <p0:ArrayMap[Object, nullable Object]> isa ArrayMap[ArrayMapKeys#0, ArrayMapKeys#1] */
+const char* var_class_name;
+/* Covariant cast for argument 0 (map) <p0:ArrayMap[Object, nullable Object]> isa ArrayMap[K, E] */
+/* <p0:ArrayMap[Object, nullable Object]> isa ArrayMap[K, E] */
 type_struct = self->type->resolution_table->types[COLOR_array__ArrayMaparray__ArrayMapKeys_FT0array__ArrayMapKeys_FT1];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -4273,82 +4603,82 @@ var = 0;
 } else {
 var = p0->type->type_table[cltype] == idtype;
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 600);
-exit(1);
+if (unlikely(!var)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "ArrayMap[K, E]", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 590);
+show_backtrace(1);
 }
-self->attrs[COLOR_array__ArrayMapKeys___64dmap].val = p0; /* @map on <self:ArrayMapKeys[Object, nullable Object]> */
+self->attrs[COLOR_array__ArrayMapKeys___map].val = p0; /* _map on <self:ArrayMapKeys[Object, nullable Object]> */
 RET_LABEL:;
 }
 /* method array#ArrayMapKeys#map= for (self: Object, ArrayMap[Object, nullable Object]) */
 void VIRTUAL_array__ArrayMapKeys__map_61d(val* self, val* p0) {
-array__ArrayMapKeys__map_61d(self, p0);
-RET_LABEL:;
-}
-/* method array#ArrayMapKeys#count for (self: ArrayMapKeys[Object, nullable Object], Object): Int */
-long array__ArrayMapKeys__count(val* self, val* p0) {
-long var /* : Int */;
-short int var1 /* : Bool */;
+short int var /* : Bool */;
 int cltype;
 int idtype;
 const struct type* type_struct;
-val* var_k /* var k: Object */;
-short int var2 /* : Bool */;
-long var3 /* : Int */;
-long var4 /* : Int */;
-/* Covariant cast for argument 0 (k) <p0:Object> isa Collection#0 */
-/* <p0:Object> isa Collection#0 */
-type_struct = self->type->resolution_table->types[COLOR_abstract_collection__Collection_FT0];
+const char* var_class_name;
+{ /* Inline array#ArrayMapKeys#map= (self,p0) on <self:Object(ArrayMapKeys[Object, nullable Object])> */
+/* Covariant cast for argument 0 (map) <p0:ArrayMap[Object, nullable Object]> isa ArrayMap[K, E] */
+/* <p0:ArrayMap[Object, nullable Object]> isa ArrayMap[K, E] */
+type_struct = self->type->resolution_table->types[COLOR_array__ArrayMaparray__ArrayMapKeys_FT0array__ArrayMapKeys_FT1];
 cltype = type_struct->color;
 idtype = type_struct->id;
 if(cltype >= p0->type->table_size) {
-var1 = 0;
+var = 0;
 } else {
-var1 = p0->type->type_table[cltype] == idtype;
-}
-if (!var1) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 602);
-exit(1);
+var = p0->type->type_table[cltype] == idtype;
 }
-var_k = p0;
-var2 = ((short int (*)(val*, val*))(self->class->vft[COLOR_abstract_collection__Collection__has]))(self, var_k) /* has on <self:ArrayMapKeys[Object, nullable Object]>*/;
-if (var2){
-var3 = 1;
-var = var3;
-goto RET_LABEL;
-} else {
-var4 = 0;
-var = var4;
-goto RET_LABEL;
+if (unlikely(!var)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "ArrayMap[K, E]", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 590);
+show_backtrace(1);
 }
-RET_LABEL:;
-return var;
+self->attrs[COLOR_array__ArrayMapKeys___map].val = p0; /* _map on <self:Object(ArrayMapKeys[Object, nullable Object])> */
+RET_LABEL1:(void)0;
 }
-/* method array#ArrayMapKeys#count for (self: Object, nullable Object): Int */
-long VIRTUAL_array__ArrayMapKeys__count(val* self, val* p0) {
-long var /* : Int */;
-long var1 /* : Int */;
-var1 = array__ArrayMapKeys__count(self, p0);
-var = var1;
 RET_LABEL:;
-return var;
 }
 /* method array#ArrayMapKeys#first for (self: ArrayMapKeys[Object, nullable Object]): Object */
 val* array__ArrayMapKeys__first(val* self) {
 val* var /* : Object */;
 val* var1 /* : ArrayMap[Object, nullable Object] */;
-val* var2 /* : Array[Couple[Object, nullable Object]] */;
-val* var3 /* : nullable Object */;
-val* var4 /* : nullable Object */;
-var1 = ((val* (*)(val*))(self->class->vft[COLOR_array__ArrayMapKeys__map]))(self) /* map on <self:ArrayMapKeys[Object, nullable Object]>*/;
-var2 = var1->attrs[COLOR_array__ArrayMap___items].val; /* _items on <var1:ArrayMap[Object, nullable Object]> */
-if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 603);
-exit(1);
-}
-var3 = ((val* (*)(val*))(var2->class->vft[COLOR_abstract_collection__Collection__first]))(var2) /* first on <var2:Array[Couple[Object, nullable Object]]>*/;
-var4 = ((val* (*)(val*))(var3->class->vft[COLOR_abstract_collection__Couple__first]))(var3) /* first on <var3:nullable Object(Couple[Object, nullable Object])>*/;
-var = var4;
+val* var3 /* : ArrayMap[Object, nullable Object] */;
+val* var4 /* : Array[Couple[Object, nullable Object]] */;
+val* var5 /* : nullable Object */;
+val* var6 /* : nullable Object */;
+val* var8 /* : nullable Object */;
+{
+{ /* Inline array#ArrayMapKeys#map (self) on <self:ArrayMapKeys[Object, nullable Object]> */
+var3 = self->attrs[COLOR_array__ArrayMapKeys___map].val; /* _map on <self:ArrayMapKeys[Object, nullable Object]> */
+if (unlikely(var3 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _map");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 590);
+show_backtrace(1);
+}
+var1 = var3;
+RET_LABEL2:(void)0;
+}
+}
+var4 = var1->attrs[COLOR_array__ArrayMap___items].val; /* _items on <var1:ArrayMap[Object, nullable Object]> */
+if (unlikely(var4 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _items");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 593);
+show_backtrace(1);
+}
+{
+var5 = abstract_collection__SequenceRead__first(var4);
+}
+{
+{ /* Inline abstract_collection#Couple#first (var5) on <var5:nullable Object(Couple[Object, nullable Object])> */
+var8 = var5->attrs[COLOR_abstract_collection__Couple___first].val; /* _first on <var5:nullable Object(Couple[Object, nullable Object])> */
+var6 = var8;
+RET_LABEL7:(void)0;
+}
+}
+var = var6;
 goto RET_LABEL;
 RET_LABEL:;
 return var;
@@ -4369,17 +4699,20 @@ short int var1 /* : Bool */;
 int cltype;
 int idtype;
 const struct type* type_struct;
+const char* var_class_name;
 val* var_k /* var k: Object */;
 val* var2 /* : ArrayMap[Object, nullable Object] */;
-long var3 /* : Int */;
-long var4 /* : Int */;
-short int var5 /* : Bool */;
+val* var4 /* : ArrayMap[Object, nullable Object] */;
+long var5 /* : Int */;
+long var6 /* : Int */;
 short int var7 /* : Bool */;
-int cltype8;
-int idtype9;
-short int var10 /* : Bool */;
-/* Covariant cast for argument 0 (k) <p0:Object> isa Collection#0 */
-/* <p0:Object> isa Collection#0 */
+short int var9 /* : Bool */;
+int cltype10;
+int idtype11;
+const char* var_class_name12;
+short int var13 /* : Bool */;
+/* Covariant cast for argument 0 (k) <p0:Object> isa E */
+/* <p0:Object> isa E */
 type_struct = self->type->resolution_table->types[COLOR_abstract_collection__Collection_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -4388,106 +4721,56 @@ var1 = 0;
 } else {
 var1 = p0->type->type_table[cltype] == idtype;
 }
-if (!var1) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 604);
-exit(1);
+if (unlikely(!var1)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "E", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 594);
+show_backtrace(1);
 }
 var_k = p0;
-var2 = ((val* (*)(val*))(self->class->vft[COLOR_array__ArrayMapKeys__map]))(self) /* map on <self:ArrayMapKeys[Object, nullable Object]>*/;
-var3 = ((long (*)(val*, val*))(var2->class->vft[COLOR_array__ArrayMap__index]))(var2, var_k) /* index on <var2:ArrayMap[Object, nullable Object]>*/;
-var4 = 0;
-{ /* Inline kernel#Int#>= (var3,var4) */
-/* Covariant cast for argument 0 (i) <var4:Int> isa OTHER */
-/* <var4:Int> isa OTHER */
-var7 = 1; /* easy <var4:Int> isa OTHER*/
-if (!var7) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 258);
-exit(1);
+{
+{ /* Inline array#ArrayMapKeys#map (self) on <self:ArrayMapKeys[Object, nullable Object]> */
+var4 = self->attrs[COLOR_array__ArrayMapKeys___map].val; /* _map on <self:ArrayMapKeys[Object, nullable Object]> */
+if (unlikely(var4 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _map");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 590);
+show_backtrace(1);
 }
-var10 = var3 >= var4;
-var5 = var10;
-goto RET_LABEL6;
-RET_LABEL6:(void)0;
-}
-var = var5;
-goto RET_LABEL;
-RET_LABEL:;
-return var;
-}
-/* method array#ArrayMapKeys#has for (self: Object, nullable Object): Bool */
-short int VIRTUAL_array__ArrayMapKeys__has(val* self, val* p0) {
-short int var /* : Bool */;
-short int var1 /* : Bool */;
-var1 = array__ArrayMapKeys__has(self, p0);
-var = var1;
-RET_LABEL:;
-return var;
+var2 = var4;
+RET_LABEL3:(void)0;
 }
-/* method array#ArrayMapKeys#has_only for (self: ArrayMapKeys[Object, nullable Object], Object): Bool */
-short int array__ArrayMapKeys__has_only(val* self, val* p0) {
-short int var /* : Bool */;
-short int var1 /* : Bool */;
-int cltype;
-int idtype;
-const struct type* type_struct;
-val* var_k /* var k: Object */;
-short int var2 /* : Bool */;
-short int var3 /* : Bool */;
-short int var4 /* : Bool */;
-short int var_ /* var : Bool */;
-long var5 /* : Int */;
-long var6 /* : Int */;
-short int var7 /* : Bool */;
-short int var9 /* : Bool */;
-short int var_10 /* var : Bool */;
-short int var11 /* : Bool */;
-/* Covariant cast for argument 0 (k) <p0:Object> isa Collection#0 */
-/* <p0:Object> isa Collection#0 */
-type_struct = self->type->resolution_table->types[COLOR_abstract_collection__Collection_FT0];
-cltype = type_struct->color;
-idtype = type_struct->id;
-if(cltype >= p0->type->table_size) {
-var1 = 0;
-} else {
-var1 = p0->type->type_table[cltype] == idtype;
 }
-if (!var1) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 605);
-exit(1);
+{
+var5 = array__ArrayMap__index(var2, var_k);
 }
-var_k = p0;
-var4 = ((short int (*)(val*, val*))(self->class->vft[COLOR_abstract_collection__Collection__has]))(self, var_k) /* has on <self:ArrayMapKeys[Object, nullable Object]>*/;
-var_ = var4;
-if (var4){
-var5 = ((long (*)(val*))(self->class->vft[COLOR_abstract_collection__Collection__length]))(self) /* length on <self:ArrayMapKeys[Object, nullable Object]>*/;
-var6 = 1;
-{ /* Inline kernel#Int#== (var5,var6) */
-var9 = var5 == var6;
-var7 = var9;
+var6 = 0;
+{
+{ /* Inline kernel#Int#>= (var5,var6) on <var5:Int> */
+/* Covariant cast for argument 0 (i) <var6:Int> isa OTHER */
+/* <var6:Int> isa OTHER */
+var9 = 1; /* easy <var6:Int> isa OTHER*/
+if (unlikely(!var9)) {
+var_class_name12 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name12);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 372);
+show_backtrace(1);
+}
+var13 = var5 >= var6;
+var7 = var13;
 goto RET_LABEL8;
 RET_LABEL8:(void)0;
 }
-var3 = var7;
-} else {
-var3 = var_;
-}
-var_10 = var3;
-if (var3){
-var2 = var_10;
-} else {
-var11 = ((short int (*)(val*))(self->class->vft[COLOR_abstract_collection__Collection__is_empty]))(self) /* is_empty on <self:ArrayMapKeys[Object, nullable Object]>*/;
-var2 = var11;
 }
-var = var2;
+var = var7;
 goto RET_LABEL;
 RET_LABEL:;
 return var;
 }
-/* method array#ArrayMapKeys#has_only for (self: Object, nullable Object): Bool */
-short int VIRTUAL_array__ArrayMapKeys__has_only(val* self, val* p0) {
+/* method array#ArrayMapKeys#has for (self: Object, nullable Object): Bool */
+short int VIRTUAL_array__ArrayMapKeys__has(val* self, val* p0) {
 short int var /* : Bool */;
 short int var1 /* : Bool */;
-var1 = array__ArrayMapKeys__has_only(self, p0);
+var1 = array__ArrayMapKeys__has(self, p0);
 var = var1;
 RET_LABEL:;
 return var;
@@ -4496,10 +4779,24 @@ return var;
 short int array__ArrayMapKeys__is_empty(val* self) {
 short int var /* : Bool */;
 val* var1 /* : ArrayMap[Object, nullable Object] */;
-short int var2 /* : Bool */;
-var1 = ((val* (*)(val*))(self->class->vft[COLOR_array__ArrayMapKeys__map]))(self) /* map on <self:ArrayMapKeys[Object, nullable Object]>*/;
-var2 = ((short int (*)(val*))(var1->class->vft[COLOR_abstract_collection__MapRead__is_empty]))(var1) /* is_empty on <var1:ArrayMap[Object, nullable Object]>*/;
-var = var2;
+val* var3 /* : ArrayMap[Object, nullable Object] */;
+short int var4 /* : Bool */;
+{
+{ /* Inline array#ArrayMapKeys#map (self) on <self:ArrayMapKeys[Object, nullable Object]> */
+var3 = self->attrs[COLOR_array__ArrayMapKeys___map].val; /* _map on <self:ArrayMapKeys[Object, nullable Object]> */
+if (unlikely(var3 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _map");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 590);
+show_backtrace(1);
+}
+var1 = var3;
+RET_LABEL2:(void)0;
+}
+}
+{
+var4 = array__ArrayMap__is_empty(var1);
+}
+var = var4;
 goto RET_LABEL;
 RET_LABEL:;
 return var;
@@ -4517,10 +4814,24 @@ return var;
 long array__ArrayMapKeys__length(val* self) {
 long var /* : Int */;
 val* var1 /* : ArrayMap[Object, nullable Object] */;
-long var2 /* : Int */;
-var1 = ((val* (*)(val*))(self->class->vft[COLOR_array__ArrayMapKeys__map]))(self) /* map on <self:ArrayMapKeys[Object, nullable Object]>*/;
-var2 = ((long (*)(val*))(var1->class->vft[COLOR_abstract_collection__MapRead__length]))(var1) /* length on <var1:ArrayMap[Object, nullable Object]>*/;
-var = var2;
+val* var3 /* : ArrayMap[Object, nullable Object] */;
+long var4 /* : Int */;
+{
+{ /* Inline array#ArrayMapKeys#map (self) on <self:ArrayMapKeys[Object, nullable Object]> */
+var3 = self->attrs[COLOR_array__ArrayMapKeys___map].val; /* _map on <self:ArrayMapKeys[Object, nullable Object]> */
+if (unlikely(var3 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _map");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 590);
+show_backtrace(1);
+}
+var1 = var3;
+RET_LABEL2:(void)0;
+}
+}
+{
+var4 = array__ArrayMap__length(var1);
+}
+var = var4;
 goto RET_LABEL;
 RET_LABEL:;
 return var;
@@ -4539,12 +4850,30 @@ val* array__ArrayMapKeys__iterator(val* self) {
 val* var /* : Iterator[Object] */;
 val* var1 /* : MapKeysIterator[Object, nullable Object] */;
 val* var2 /* : ArrayMap[Object, nullable Object] */;
-val* var3 /* : MapIterator[Object, nullable Object] */;
+val* var4 /* : ArrayMap[Object, nullable Object] */;
+val* var5 /* : MapIterator[Object, nullable Object] */;
 var1 = NEW_abstract_collection__MapKeysIterator(self->type->resolution_table->types[COLOR_abstract_collection__MapKeysIteratorarray__ArrayMapKeys_FT0array__ArrayMapKeys_FT1]);
-var2 = ((val* (*)(val*))(self->class->vft[COLOR_array__ArrayMapKeys__map]))(self) /* map on <self:ArrayMapKeys[Object, nullable Object]>*/;
-var3 = ((val* (*)(val*))(var2->class->vft[COLOR_abstract_collection__MapRead__iterator]))(var2) /* iterator on <var2:ArrayMap[Object, nullable Object]>*/;
-((void (*)(val*, val*))(var1->class->vft[COLOR_abstract_collection__MapKeysIterator__init]))(var1, var3) /* init on <var1:MapKeysIterator[Object, nullable Object]>*/;
-CHECK_NEW_abstract_collection__MapKeysIterator(var1);
+{
+{ /* Inline array#ArrayMapKeys#map (self) on <self:ArrayMapKeys[Object, nullable Object]> */
+var4 = self->attrs[COLOR_array__ArrayMapKeys___map].val; /* _map on <self:ArrayMapKeys[Object, nullable Object]> */
+if (unlikely(var4 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _map");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 590);
+show_backtrace(1);
+}
+var2 = var4;
+RET_LABEL3:(void)0;
+}
+}
+{
+var5 = abstract_collection__CoupleMap__iterator(var2);
+}
+{
+((void (*)(val*, val*))(var1->class->vft[COLOR_abstract_collection__MapKeysIterator__original_iterator_61d]))(var1, var5) /* original_iterator= on <var1:MapKeysIterator[Object, nullable Object]>*/;
+}
+{
+((void (*)(val*))(var1->class->vft[COLOR_kernel__Object__init]))(var1) /* init on <var1:MapKeysIterator[Object, nullable Object]>*/;
+}
 var = var1;
 goto RET_LABEL;
 RET_LABEL:;
@@ -4562,13 +4891,27 @@ return var;
 /* method array#ArrayMapKeys#clear for (self: ArrayMapKeys[Object, nullable Object]) */
 void array__ArrayMapKeys__clear(val* self) {
 val* var /* : ArrayMap[Object, nullable Object] */;
-var = ((val* (*)(val*))(self->class->vft[COLOR_array__ArrayMapKeys__map]))(self) /* map on <self:ArrayMapKeys[Object, nullable Object]>*/;
-((void (*)(val*))(var->class->vft[COLOR_abstract_collection__Map__clear]))(var) /* clear on <var:ArrayMap[Object, nullable Object]>*/;
+val* var2 /* : ArrayMap[Object, nullable Object] */;
+{
+{ /* Inline array#ArrayMapKeys#map (self) on <self:ArrayMapKeys[Object, nullable Object]> */
+var2 = self->attrs[COLOR_array__ArrayMapKeys___map].val; /* _map on <self:ArrayMapKeys[Object, nullable Object]> */
+if (unlikely(var2 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _map");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 590);
+show_backtrace(1);
+}
+var = var2;
+RET_LABEL1:(void)0;
+}
+}
+{
+array__ArrayMap__clear(var); /* Direct call array#ArrayMap#clear on <var:ArrayMap[Object, nullable Object]>*/
+}
 RET_LABEL:;
 }
 /* method array#ArrayMapKeys#clear for (self: Object) */
 void VIRTUAL_array__ArrayMapKeys__clear(val* self) {
-array__ArrayMapKeys__clear(self);
+array__ArrayMapKeys__clear(self); /* Direct call array#ArrayMapKeys#clear on <self:Object(ArrayMapKeys[Object, nullable Object])>*/
 RET_LABEL:;
 }
 /* method array#ArrayMapKeys#remove for (self: ArrayMapKeys[Object, nullable Object], Object) */
@@ -4577,19 +4920,23 @@ short int var /* : Bool */;
 int cltype;
 int idtype;
 const struct type* type_struct;
+const char* var_class_name;
 val* var_key /* var key: Object */;
 val* var1 /* : ArrayMap[Object, nullable Object] */;
-long var2 /* : Int */;
+val* var3 /* : ArrayMap[Object, nullable Object] */;
+long var4 /* : Int */;
 long var_i /* var i: Int */;
-long var3 /* : Int */;
-short int var4 /* : Bool */;
+long var5 /* : Int */;
 short int var6 /* : Bool */;
-int cltype7;
-int idtype8;
-short int var9 /* : Bool */;
-val* var10 /* : ArrayMap[Object, nullable Object] */;
-/* Covariant cast for argument 0 (key) <p0:Object> isa RemovableCollection#0 */
-/* <p0:Object> isa RemovableCollection#0 */
+short int var8 /* : Bool */;
+int cltype9;
+int idtype10;
+const char* var_class_name11;
+short int var12 /* : Bool */;
+val* var13 /* : ArrayMap[Object, nullable Object] */;
+val* var15 /* : ArrayMap[Object, nullable Object] */;
+/* Covariant cast for argument 0 (key) <p0:Object> isa E */
+/* <p0:Object> isa E */
 type_struct = self->type->resolution_table->types[COLOR_abstract_collection__RemovableCollection_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -4598,106 +4945,98 @@ var = 0;
 } else {
 var = p0->type->type_table[cltype] == idtype;
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 610);
-exit(1);
+if (unlikely(!var)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "E", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 600);
+show_backtrace(1);
 }
 var_key = p0;
-var1 = ((val* (*)(val*))(self->class->vft[COLOR_array__ArrayMapKeys__map]))(self) /* map on <self:ArrayMapKeys[Object, nullable Object]>*/;
-var2 = ((long (*)(val*, val*))(var1->class->vft[COLOR_array__ArrayMap__index]))(var1, var_key) /* index on <var1:ArrayMap[Object, nullable Object]>*/;
-var_i = var2;
-var3 = 0;
-{ /* Inline kernel#Int#>= (var_i,var3) */
-/* Covariant cast for argument 0 (i) <var3:Int> isa OTHER */
-/* <var3:Int> isa OTHER */
-var6 = 1; /* easy <var3:Int> isa OTHER*/
-if (!var6) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 258);
-exit(1);
+{
+{ /* Inline array#ArrayMapKeys#map (self) on <self:ArrayMapKeys[Object, nullable Object]> */
+var3 = self->attrs[COLOR_array__ArrayMapKeys___map].val; /* _map on <self:ArrayMapKeys[Object, nullable Object]> */
+if (unlikely(var3 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _map");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 590);
+show_backtrace(1);
 }
-var9 = var_i >= var3;
-var4 = var9;
-goto RET_LABEL5;
-RET_LABEL5:(void)0;
+var1 = var3;
+RET_LABEL2:(void)0;
+}
+}
+{
+var4 = array__ArrayMap__index(var1, var_key);
+}
+var_i = var4;
+var5 = 0;
+{
+{ /* Inline kernel#Int#>= (var_i,var5) on <var_i:Int> */
+/* Covariant cast for argument 0 (i) <var5:Int> isa OTHER */
+/* <var5:Int> isa OTHER */
+var8 = 1; /* easy <var5:Int> isa OTHER*/
+if (unlikely(!var8)) {
+var_class_name11 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name11);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 372);
+show_backtrace(1);
+}
+var12 = var_i >= var5;
+var6 = var12;
+goto RET_LABEL7;
+RET_LABEL7:(void)0;
+}
+}
+if (var6){
+{
+{ /* Inline array#ArrayMapKeys#map (self) on <self:ArrayMapKeys[Object, nullable Object]> */
+var15 = self->attrs[COLOR_array__ArrayMapKeys___map].val; /* _map on <self:ArrayMapKeys[Object, nullable Object]> */
+if (unlikely(var15 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _map");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 590);
+show_backtrace(1);
+}
+var13 = var15;
+RET_LABEL14:(void)0;
+}
+}
+{
+array__ArrayMap__remove_at_index(var13, var_i); /* Direct call array#ArrayMap#remove_at_index on <var13:ArrayMap[Object, nullable Object]>*/
 }
-if (var4){
-var10 = ((val* (*)(val*))(self->class->vft[COLOR_array__ArrayMapKeys__map]))(self) /* map on <self:ArrayMapKeys[Object, nullable Object]>*/;
-((void (*)(val*, long))(var10->class->vft[COLOR_array__ArrayMap__remove_at_index]))(var10, var_i) /* remove_at_index on <var10:ArrayMap[Object, nullable Object]>*/;
 } else {
 }
 RET_LABEL:;
 }
 /* method array#ArrayMapKeys#remove for (self: Object, nullable Object) */
 void VIRTUAL_array__ArrayMapKeys__remove(val* self, val* p0) {
-array__ArrayMapKeys__remove(self, p0);
+array__ArrayMapKeys__remove(self, p0); /* Direct call array#ArrayMapKeys#remove on <self:Object(ArrayMapKeys[Object, nullable Object])>*/
 RET_LABEL:;
 }
-/* method array#ArrayMapKeys#remove_all for (self: ArrayMapKeys[Object, nullable Object], Object) */
-void array__ArrayMapKeys__remove_all(val* self, val* p0) {
-short int var /* : Bool */;
-int cltype;
-int idtype;
-const struct type* type_struct;
-val* var_key /* var key: Object */;
-/* Covariant cast for argument 0 (key) <p0:Object> isa RemovableCollection#0 */
-/* <p0:Object> isa RemovableCollection#0 */
-type_struct = self->type->resolution_table->types[COLOR_abstract_collection__RemovableCollection_FT0];
-cltype = type_struct->color;
-idtype = type_struct->id;
-if(cltype >= p0->type->table_size) {
-var = 0;
-} else {
-var = p0->type->type_table[cltype] == idtype;
-}
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 615);
-exit(1);
+/* method array#ArrayMapKeys#init for (self: ArrayMapKeys[Object, nullable Object]) */
+void array__ArrayMapKeys__init(val* self) {
+{
+((void (*)(val*))(self->class->vft[COLOR_array__ArrayMapKeys__init]))(self) /* init on <self:ArrayMapKeys[Object, nullable Object]>*/;
 }
-var_key = p0;
-((void (*)(val*, val*))(self->class->vft[COLOR_abstract_collection__RemovableCollection__remove]))(self, var_key) /* remove on <self:ArrayMapKeys[Object, nullable Object]>*/;
-RET_LABEL:;
-}
-/* method array#ArrayMapKeys#remove_all for (self: Object, nullable Object) */
-void VIRTUAL_array__ArrayMapKeys__remove_all(val* self, val* p0) {
-array__ArrayMapKeys__remove_all(self, p0);
 RET_LABEL:;
 }
-/* method array#ArrayMapKeys#init for (self: ArrayMapKeys[Object, nullable Object], ArrayMap[Object, nullable Object]) */
-void array__ArrayMapKeys__init(val* self, val* p0) {
-short int var /* : Bool */;
-int cltype;
-int idtype;
-const struct type* type_struct;
-/* Covariant cast for argument 0 (map) <p0:ArrayMap[Object, nullable Object]> isa ArrayMap[ArrayMapKeys#0, ArrayMapKeys#1] */
-/* <p0:ArrayMap[Object, nullable Object]> isa ArrayMap[ArrayMapKeys#0, ArrayMapKeys#1] */
-type_struct = self->type->resolution_table->types[COLOR_array__ArrayMaparray__ArrayMapKeys_FT0array__ArrayMapKeys_FT1];
-cltype = type_struct->color;
-idtype = type_struct->id;
-if(cltype >= p0->type->table_size) {
-var = 0;
-} else {
-var = p0->type->type_table[cltype] == idtype;
-}
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 598);
-exit(1);
+/* method array#ArrayMapKeys#init for (self: Object) */
+void VIRTUAL_array__ArrayMapKeys__init(val* self) {
+{ /* Inline array#ArrayMapKeys#init (self) on <self:Object(ArrayMapKeys[Object, nullable Object])> */
+{
+((void (*)(val*))(self->class->vft[COLOR_array__ArrayMapKeys__init]))(self) /* init on <self:Object(ArrayMapKeys[Object, nullable Object])>*/;
 }
-self->attrs[COLOR_array__ArrayMapKeys___64dmap].val = p0; /* @map on <self:ArrayMapKeys[Object, nullable Object]> */
-RET_LABEL:;
+RET_LABEL1:(void)0;
 }
-/* method array#ArrayMapKeys#init for (self: Object, ArrayMap[Object, nullable Object]) */
-void VIRTUAL_array__ArrayMapKeys__init(val* self, val* p0) {
-array__ArrayMapKeys__init(self, p0);
 RET_LABEL:;
 }
 /* method array#ArrayMapValues#map for (self: ArrayMapValues[Object, nullable Object]): ArrayMap[Object, nullable Object] */
 val* array__ArrayMapValues__map(val* self) {
 val* var /* : ArrayMap[Object, nullable Object] */;
 val* var1 /* : ArrayMap[Object, nullable Object] */;
-var1 = self->attrs[COLOR_array__ArrayMapValues___64dmap].val; /* @map on <self:ArrayMapValues[Object, nullable Object]> */
-if (var1 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute @map", "lib/standard/collection/array.nit", 620);
-exit(1);
+var1 = self->attrs[COLOR_array__ArrayMapValues___map].val; /* _map on <self:ArrayMapValues[Object, nullable Object]> */
+if (unlikely(var1 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _map");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 610);
+show_backtrace(1);
 }
 var = var1;
 RET_LABEL:;
@@ -4707,7 +5046,17 @@ return var;
 val* VIRTUAL_array__ArrayMapValues__map(val* self) {
 val* var /* : ArrayMap[Object, nullable Object] */;
 val* var1 /* : ArrayMap[Object, nullable Object] */;
-var1 = array__ArrayMapValues__map(self);
+val* var3 /* : ArrayMap[Object, nullable Object] */;
+{ /* Inline array#ArrayMapValues#map (self) on <self:Object(ArrayMapValues[Object, nullable Object])> */
+var3 = self->attrs[COLOR_array__ArrayMapValues___map].val; /* _map on <self:Object(ArrayMapValues[Object, nullable Object])> */
+if (unlikely(var3 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _map");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 610);
+show_backtrace(1);
+}
+var1 = var3;
+RET_LABEL2:(void)0;
+}
 var = var1;
 RET_LABEL:;
 return var;
@@ -4718,8 +5067,9 @@ short int var /* : Bool */;
 int cltype;
 int idtype;
 const struct type* type_struct;
-/* Covariant cast for argument 0 (map) <p0:ArrayMap[Object, nullable Object]> isa ArrayMap[ArrayMapValues#0, ArrayMapValues#1] */
-/* <p0:ArrayMap[Object, nullable Object]> isa ArrayMap[ArrayMapValues#0, ArrayMapValues#1] */
+const char* var_class_name;
+/* Covariant cast for argument 0 (map) <p0:ArrayMap[Object, nullable Object]> isa ArrayMap[K, E] */
+/* <p0:ArrayMap[Object, nullable Object]> isa ArrayMap[K, E] */
 type_struct = self->type->resolution_table->types[COLOR_array__ArrayMaparray__ArrayMapValues_FT0array__ArrayMapValues_FT1];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -4728,34 +5078,82 @@ var = 0;
 } else {
 var = p0->type->type_table[cltype] == idtype;
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 620);
-exit(1);
+if (unlikely(!var)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "ArrayMap[K, E]", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 610);
+show_backtrace(1);
 }
-self->attrs[COLOR_array__ArrayMapValues___64dmap].val = p0; /* @map on <self:ArrayMapValues[Object, nullable Object]> */
+self->attrs[COLOR_array__ArrayMapValues___map].val = p0; /* _map on <self:ArrayMapValues[Object, nullable Object]> */
 RET_LABEL:;
 }
 /* method array#ArrayMapValues#map= for (self: Object, ArrayMap[Object, nullable Object]) */
 void VIRTUAL_array__ArrayMapValues__map_61d(val* self, val* p0) {
-array__ArrayMapValues__map_61d(self, p0);
+short int var /* : Bool */;
+int cltype;
+int idtype;
+const struct type* type_struct;
+const char* var_class_name;
+{ /* Inline array#ArrayMapValues#map= (self,p0) on <self:Object(ArrayMapValues[Object, nullable Object])> */
+/* Covariant cast for argument 0 (map) <p0:ArrayMap[Object, nullable Object]> isa ArrayMap[K, E] */
+/* <p0:ArrayMap[Object, nullable Object]> isa ArrayMap[K, E] */
+type_struct = self->type->resolution_table->types[COLOR_array__ArrayMaparray__ArrayMapValues_FT0array__ArrayMapValues_FT1];
+cltype = type_struct->color;
+idtype = type_struct->id;
+if(cltype >= p0->type->table_size) {
+var = 0;
+} else {
+var = p0->type->type_table[cltype] == idtype;
+}
+if (unlikely(!var)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "ArrayMap[K, E]", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 610);
+show_backtrace(1);
+}
+self->attrs[COLOR_array__ArrayMapValues___map].val = p0; /* _map on <self:Object(ArrayMapValues[Object, nullable Object])> */
+RET_LABEL1:(void)0;
+}
 RET_LABEL:;
 }
 /* method array#ArrayMapValues#first for (self: ArrayMapValues[Object, nullable Object]): nullable Object */
 val* array__ArrayMapValues__first(val* self) {
 val* var /* : nullable Object */;
 val* var1 /* : ArrayMap[Object, nullable Object] */;
-val* var2 /* : Array[Couple[Object, nullable Object]] */;
-val* var3 /* : nullable Object */;
-val* var4 /* : nullable Object */;
-var1 = ((val* (*)(val*))(self->class->vft[COLOR_array__ArrayMapValues__map]))(self) /* map on <self:ArrayMapValues[Object, nullable Object]>*/;
-var2 = var1->attrs[COLOR_array__ArrayMap___items].val; /* _items on <var1:ArrayMap[Object, nullable Object]> */
-if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 622);
-exit(1);
-}
-var3 = ((val* (*)(val*))(var2->class->vft[COLOR_abstract_collection__Collection__first]))(var2) /* first on <var2:Array[Couple[Object, nullable Object]]>*/;
-var4 = ((val* (*)(val*))(var3->class->vft[COLOR_abstract_collection__Couple__second]))(var3) /* second on <var3:nullable Object(Couple[Object, nullable Object])>*/;
-var = var4;
+val* var3 /* : ArrayMap[Object, nullable Object] */;
+val* var4 /* : Array[Couple[Object, nullable Object]] */;
+val* var5 /* : nullable Object */;
+val* var6 /* : nullable Object */;
+val* var8 /* : nullable Object */;
+{
+{ /* Inline array#ArrayMapValues#map (self) on <self:ArrayMapValues[Object, nullable Object]> */
+var3 = self->attrs[COLOR_array__ArrayMapValues___map].val; /* _map on <self:ArrayMapValues[Object, nullable Object]> */
+if (unlikely(var3 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _map");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 610);
+show_backtrace(1);
+}
+var1 = var3;
+RET_LABEL2:(void)0;
+}
+}
+var4 = var1->attrs[COLOR_array__ArrayMap___items].val; /* _items on <var1:ArrayMap[Object, nullable Object]> */
+if (unlikely(var4 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _items");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 612);
+show_backtrace(1);
+}
+{
+var5 = abstract_collection__SequenceRead__first(var4);
+}
+{
+{ /* Inline abstract_collection#Couple#second (var5) on <var5:nullable Object(Couple[Object, nullable Object])> */
+var8 = var5->attrs[COLOR_abstract_collection__Couple___second].val; /* _second on <var5:nullable Object(Couple[Object, nullable Object])> */
+var6 = var8;
+RET_LABEL7:(void)0;
+}
+}
+var = var6;
 goto RET_LABEL;
 RET_LABEL:;
 return var;
@@ -4773,10 +5171,24 @@ return var;
 short int array__ArrayMapValues__is_empty(val* self) {
 short int var /* : Bool */;
 val* var1 /* : ArrayMap[Object, nullable Object] */;
-short int var2 /* : Bool */;
-var1 = ((val* (*)(val*))(self->class->vft[COLOR_array__ArrayMapValues__map]))(self) /* map on <self:ArrayMapValues[Object, nullable Object]>*/;
-var2 = ((short int (*)(val*))(var1->class->vft[COLOR_abstract_collection__MapRead__is_empty]))(var1) /* is_empty on <var1:ArrayMap[Object, nullable Object]>*/;
-var = var2;
+val* var3 /* : ArrayMap[Object, nullable Object] */;
+short int var4 /* : Bool */;
+{
+{ /* Inline array#ArrayMapValues#map (self) on <self:ArrayMapValues[Object, nullable Object]> */
+var3 = self->attrs[COLOR_array__ArrayMapValues___map].val; /* _map on <self:ArrayMapValues[Object, nullable Object]> */
+if (unlikely(var3 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _map");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 610);
+show_backtrace(1);
+}
+var1 = var3;
+RET_LABEL2:(void)0;
+}
+}
+{
+var4 = array__ArrayMap__is_empty(var1);
+}
+var = var4;
 goto RET_LABEL;
 RET_LABEL:;
 return var;
@@ -4794,10 +5206,24 @@ return var;
 long array__ArrayMapValues__length(val* self) {
 long var /* : Int */;
 val* var1 /* : ArrayMap[Object, nullable Object] */;
-long var2 /* : Int */;
-var1 = ((val* (*)(val*))(self->class->vft[COLOR_array__ArrayMapValues__map]))(self) /* map on <self:ArrayMapValues[Object, nullable Object]>*/;
-var2 = ((long (*)(val*))(var1->class->vft[COLOR_abstract_collection__MapRead__length]))(var1) /* length on <var1:ArrayMap[Object, nullable Object]>*/;
-var = var2;
+val* var3 /* : ArrayMap[Object, nullable Object] */;
+long var4 /* : Int */;
+{
+{ /* Inline array#ArrayMapValues#map (self) on <self:ArrayMapValues[Object, nullable Object]> */
+var3 = self->attrs[COLOR_array__ArrayMapValues___map].val; /* _map on <self:ArrayMapValues[Object, nullable Object]> */
+if (unlikely(var3 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _map");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 610);
+show_backtrace(1);
+}
+var1 = var3;
+RET_LABEL2:(void)0;
+}
+}
+{
+var4 = array__ArrayMap__length(var1);
+}
+var = var4;
 goto RET_LABEL;
 RET_LABEL:;
 return var;
@@ -4816,214 +5242,71 @@ val* array__ArrayMapValues__iterator(val* self) {
 val* var /* : Iterator[nullable Object] */;
 val* var1 /* : MapValuesIterator[Object, nullable Object] */;
 val* var2 /* : ArrayMap[Object, nullable Object] */;
-val* var3 /* : MapIterator[Object, nullable Object] */;
+val* var4 /* : ArrayMap[Object, nullable Object] */;
+val* var5 /* : MapIterator[Object, nullable Object] */;
 var1 = NEW_abstract_collection__MapValuesIterator(self->type->resolution_table->types[COLOR_abstract_collection__MapValuesIteratorarray__ArrayMapValues_FT0array__ArrayMapValues_FT1]);
-var2 = ((val* (*)(val*))(self->class->vft[COLOR_array__ArrayMapValues__map]))(self) /* map on <self:ArrayMapValues[Object, nullable Object]>*/;
-var3 = ((val* (*)(val*))(var2->class->vft[COLOR_abstract_collection__MapRead__iterator]))(var2) /* iterator on <var2:ArrayMap[Object, nullable Object]>*/;
-((void (*)(val*, val*))(var1->class->vft[COLOR_abstract_collection__MapValuesIterator__init]))(var1, var3) /* init on <var1:MapValuesIterator[Object, nullable Object]>*/;
-CHECK_NEW_abstract_collection__MapValuesIterator(var1);
-var = var1;
-goto RET_LABEL;
-RET_LABEL:;
-return var;
-}
-/* method array#ArrayMapValues#iterator for (self: Object): Iterator[nullable Object] */
-val* VIRTUAL_array__ArrayMapValues__iterator(val* self) {
-val* var /* : Iterator[nullable Object] */;
-val* var1 /* : Iterator[nullable Object] */;
-var1 = array__ArrayMapValues__iterator(self);
-var = var1;
-RET_LABEL:;
-return var;
-}
-/* method array#ArrayMapValues#has for (self: ArrayMapValues[Object, nullable Object], nullable Object): Bool */
-short int array__ArrayMapValues__has(val* self, val* p0) {
-short int var /* : Bool */;
-short int var1 /* : Bool */;
-int cltype;
-int idtype;
-const struct type* type_struct;
-short int is_nullable;
-val* var_item /* var item: nullable Object */;
-val* var2 /* : ArrayMap[Object, nullable Object] */;
-val* var3 /* : Array[Couple[Object, nullable Object]] */;
-val* var4 /* : Iterator[nullable Object] */;
-short int var5 /* : Bool */;
-val* var6 /* : nullable Object */;
-val* var_i /* var i: Couple[Object, nullable Object] */;
-val* var7 /* : nullable Object */;
-short int var8 /* : Bool */;
-short int var9 /* : Bool */;
-short int var10 /* : Bool */;
-/* Covariant cast for argument 0 (item) <p0:nullable Object> isa Collection#0 */
-/* <p0:nullable Object> isa Collection#0 */
-type_struct = self->type->resolution_table->types[COLOR_abstract_collection__Collection_FT0];
-cltype = type_struct->color;
-idtype = type_struct->id;
-is_nullable = type_struct->is_nullable;
-if(p0 == NULL) {
-var1 = is_nullable;
-} else {
-if(cltype >= p0->type->table_size) {
-var1 = 0;
-} else {
-var1 = p0->type->type_table[cltype] == idtype;
-}
-}
-if (!var1) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 627);
-exit(1);
-}
-var_item = p0;
-var2 = ((val* (*)(val*))(self->class->vft[COLOR_array__ArrayMapValues__map]))(self) /* map on <self:ArrayMapValues[Object, nullable Object]>*/;
-var3 = var2->attrs[COLOR_array__ArrayMap___items].val; /* _items on <var2:ArrayMap[Object, nullable Object]> */
-if (var3 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 630);
-exit(1);
-}
-var4 = ((val* (*)(val*))(var3->class->vft[COLOR_abstract_collection__Collection__iterator]))(var3) /* iterator on <var3:Array[Couple[Object, nullable Object]]>*/;
-for(;;) {
-var5 = ((short int (*)(val*))(var4->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(var4) /* is_ok on <var4:Iterator[nullable Object]>*/;
-if(!var5) break;
-var6 = ((val* (*)(val*))(var4->class->vft[COLOR_abstract_collection__Iterator__item]))(var4) /* item on <var4:Iterator[nullable Object]>*/;
-var_i = var6;
-var7 = ((val* (*)(val*))(var_i->class->vft[COLOR_abstract_collection__Couple__second]))(var_i) /* second on <var_i:Couple[Object, nullable Object]>*/;
-if (var7 == NULL) {
-var8 = (var_item == NULL);
-} else {
-var8 = ((short int (*)(val*, val*))(var7->class->vft[COLOR_kernel__Object___61d_61d]))(var7, var_item) /* == on <var7:nullable Object>*/;
-}
-if (var8){
-var9 = 1;
-var = var9;
-goto RET_LABEL;
-} else {
-}
-CONTINUE_label: (void)0;
-((void (*)(val*))(var4->class->vft[COLOR_abstract_collection__Iterator__next]))(var4) /* next on <var4:Iterator[nullable Object]>*/;
-}
-BREAK_label: (void)0;
-var10 = 0;
-var = var10;
-goto RET_LABEL;
-RET_LABEL:;
-return var;
-}
-/* method array#ArrayMapValues#has for (self: Object, nullable Object): Bool */
-short int VIRTUAL_array__ArrayMapValues__has(val* self, val* p0) {
-short int var /* : Bool */;
-short int var1 /* : Bool */;
-var1 = array__ArrayMapValues__has(self, p0);
-var = var1;
-RET_LABEL:;
-return var;
-}
-/* method array#ArrayMapValues#has_only for (self: ArrayMapValues[Object, nullable Object], nullable Object): Bool */
-short int array__ArrayMapValues__has_only(val* self, val* p0) {
-short int var /* : Bool */;
-short int var1 /* : Bool */;
-int cltype;
-int idtype;
-const struct type* type_struct;
-short int is_nullable;
-val* var_item /* var item: nullable Object */;
-val* var2 /* : ArrayMap[Object, nullable Object] */;
-val* var3 /* : Array[Couple[Object, nullable Object]] */;
-val* var4 /* : Iterator[nullable Object] */;
-short int var5 /* : Bool */;
-val* var6 /* : nullable Object */;
-val* var_i /* var i: Couple[Object, nullable Object] */;
-val* var7 /* : nullable Object */;
-short int var8 /* : Bool */;
-short int var9 /* : Bool */;
-short int var10 /* : Bool */;
-/* Covariant cast for argument 0 (item) <p0:nullable Object> isa Collection#0 */
-/* <p0:nullable Object> isa Collection#0 */
-type_struct = self->type->resolution_table->types[COLOR_abstract_collection__Collection_FT0];
-cltype = type_struct->color;
-idtype = type_struct->id;
-is_nullable = type_struct->is_nullable;
-if(p0 == NULL) {
-var1 = is_nullable;
-} else {
-if(cltype >= p0->type->table_size) {
-var1 = 0;
-} else {
-var1 = p0->type->type_table[cltype] == idtype;
+{
+{ /* Inline array#ArrayMapValues#map (self) on <self:ArrayMapValues[Object, nullable Object]> */
+var4 = self->attrs[COLOR_array__ArrayMapValues___map].val; /* _map on <self:ArrayMapValues[Object, nullable Object]> */
+if (unlikely(var4 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _map");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 610);
+show_backtrace(1);
 }
+var2 = var4;
+RET_LABEL3:(void)0;
 }
-if (!var1) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 634);
-exit(1);
-}
-var_item = p0;
-var2 = ((val* (*)(val*))(self->class->vft[COLOR_array__ArrayMapValues__map]))(self) /* map on <self:ArrayMapValues[Object, nullable Object]>*/;
-var3 = var2->attrs[COLOR_array__ArrayMap___items].val; /* _items on <var2:ArrayMap[Object, nullable Object]> */
-if (var3 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 637);
-exit(1);
 }
-var4 = ((val* (*)(val*))(var3->class->vft[COLOR_abstract_collection__Collection__iterator]))(var3) /* iterator on <var3:Array[Couple[Object, nullable Object]]>*/;
-for(;;) {
-var5 = ((short int (*)(val*))(var4->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(var4) /* is_ok on <var4:Iterator[nullable Object]>*/;
-if(!var5) break;
-var6 = ((val* (*)(val*))(var4->class->vft[COLOR_abstract_collection__Iterator__item]))(var4) /* item on <var4:Iterator[nullable Object]>*/;
-var_i = var6;
-var7 = ((val* (*)(val*))(var_i->class->vft[COLOR_abstract_collection__Couple__second]))(var_i) /* second on <var_i:Couple[Object, nullable Object]>*/;
-if (var7 == NULL) {
-var8 = (var_item != NULL);
-} else {
-var8 = ((short int (*)(val*, val*))(var7->class->vft[COLOR_kernel__Object___33d_61d]))(var7, var_item) /* != on <var7:nullable Object>*/;
+{
+var5 = abstract_collection__CoupleMap__iterator(var2);
 }
-if (var8){
-var9 = 0;
-var = var9;
-goto RET_LABEL;
-} else {
+{
+((void (*)(val*, val*))(var1->class->vft[COLOR_abstract_collection__MapValuesIterator__original_iterator_61d]))(var1, var5) /* original_iterator= on <var1:MapValuesIterator[Object, nullable Object]>*/;
 }
-CONTINUE_label: (void)0;
-((void (*)(val*))(var4->class->vft[COLOR_abstract_collection__Iterator__next]))(var4) /* next on <var4:Iterator[nullable Object]>*/;
+{
+((void (*)(val*))(var1->class->vft[COLOR_kernel__Object__init]))(var1) /* init on <var1:MapValuesIterator[Object, nullable Object]>*/;
 }
-BREAK_label: (void)0;
-var10 = 1;
-var = var10;
+var = var1;
 goto RET_LABEL;
 RET_LABEL:;
 return var;
 }
-/* method array#ArrayMapValues#has_only for (self: Object, nullable Object): Bool */
-short int VIRTUAL_array__ArrayMapValues__has_only(val* self, val* p0) {
-short int var /* : Bool */;
-short int var1 /* : Bool */;
-var1 = array__ArrayMapValues__has_only(self, p0);
+/* method array#ArrayMapValues#iterator for (self: Object): Iterator[nullable Object] */
+val* VIRTUAL_array__ArrayMapValues__iterator(val* self) {
+val* var /* : Iterator[nullable Object] */;
+val* var1 /* : Iterator[nullable Object] */;
+var1 = array__ArrayMapValues__iterator(self);
 var = var1;
 RET_LABEL:;
 return var;
 }
-/* method array#ArrayMapValues#count for (self: ArrayMapValues[Object, nullable Object], nullable Object): Int */
-long array__ArrayMapValues__count(val* self, val* p0) {
-long var /* : Int */;
+/* method array#ArrayMapValues#has for (self: ArrayMapValues[Object, nullable Object], nullable Object): Bool */
+short int array__ArrayMapValues__has(val* self, val* p0) {
+short int var /* : Bool */;
 short int var1 /* : Bool */;
 int cltype;
 int idtype;
 const struct type* type_struct;
 short int is_nullable;
+const char* var_class_name;
 val* var_item /* var item: nullable Object */;
-long var2 /* : Int */;
-long var_nb /* var nb: Int */;
-val* var3 /* : ArrayMap[Object, nullable Object] */;
-val* var4 /* : Array[Couple[Object, nullable Object]] */;
-val* var5 /* : Iterator[nullable Object] */;
-short int var6 /* : Bool */;
-val* var7 /* : nullable Object */;
+val* var2 /* : ArrayMap[Object, nullable Object] */;
+val* var4 /* : ArrayMap[Object, nullable Object] */;
+val* var5 /* : Array[Couple[Object, nullable Object]] */;
+val* var_ /* var : Array[Couple[Object, nullable Object]] */;
+val* var6 /* : ArrayIterator[nullable Object] */;
+val* var_7 /* var : ArrayIterator[Couple[Object, nullable Object]] */;
+short int var8 /* : Bool */;
+val* var9 /* : nullable Object */;
 val* var_i /* var i: Couple[Object, nullable Object] */;
-val* var8 /* : nullable Object */;
-short int var9 /* : Bool */;
-long var10 /* : Int */;
-long var11 /* : Int */;
-long var13 /* : Int */;
-/* Covariant cast for argument 0 (item) <p0:nullable Object> isa Collection#0 */
-/* <p0:nullable Object> isa Collection#0 */
+val* var10 /* : nullable Object */;
+val* var12 /* : nullable Object */;
+short int var13 /* : Bool */;
+short int var14 /* : Bool */;
+short int var15 /* : Bool */;
+short int var17 /* : Bool */;
+/* Covariant cast for argument 0 (item) <p0:nullable Object> isa E */
+/* <p0:nullable Object> isa E */
 type_struct = self->type->resolution_table->types[COLOR_abstract_collection__Collection_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -5037,56 +5320,88 @@ var1 = 0;
 var1 = p0->type->type_table[cltype] == idtype;
 }
 }
-if (!var1) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 641);
-exit(1);
+if (unlikely(!var1)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "E", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 617);
+show_backtrace(1);
 }
 var_item = p0;
-var2 = 0;
-var_nb = var2;
-var3 = ((val* (*)(val*))(self->class->vft[COLOR_array__ArrayMapValues__map]))(self) /* map on <self:ArrayMapValues[Object, nullable Object]>*/;
-var4 = var3->attrs[COLOR_array__ArrayMap___items].val; /* _items on <var3:ArrayMap[Object, nullable Object]> */
-if (var4 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 645);
-exit(1);
-}
-var5 = ((val* (*)(val*))(var4->class->vft[COLOR_abstract_collection__Collection__iterator]))(var4) /* iterator on <var4:Array[Couple[Object, nullable Object]]>*/;
+{
+{ /* Inline array#ArrayMapValues#map (self) on <self:ArrayMapValues[Object, nullable Object]> */
+var4 = self->attrs[COLOR_array__ArrayMapValues___map].val; /* _map on <self:ArrayMapValues[Object, nullable Object]> */
+if (unlikely(var4 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _map");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 610);
+show_backtrace(1);
+}
+var2 = var4;
+RET_LABEL3:(void)0;
+}
+}
+var5 = var2->attrs[COLOR_array__ArrayMap___items].val; /* _items on <var2:ArrayMap[Object, nullable Object]> */
+if (unlikely(var5 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _items");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 620);
+show_backtrace(1);
+}
+var_ = var5;
+{
+var6 = array__AbstractArrayRead__iterator(var_);
+}
+var_7 = var6;
 for(;;) {
-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_i = var7;
-var8 = ((val* (*)(val*))(var_i->class->vft[COLOR_abstract_collection__Couple__second]))(var_i) /* second on <var_i:Couple[Object, nullable Object]>*/;
-if (var8 == NULL) {
-var9 = (var_item == NULL);
+{
+var8 = array__ArrayIterator__is_ok(var_7);
+}
+if (var8){
+{
+var9 = array__ArrayIterator__item(var_7);
+}
+var_i = var9;
+{
+{ /* Inline abstract_collection#Couple#second (var_i) on <var_i:Couple[Object, nullable Object]> */
+var12 = var_i->attrs[COLOR_abstract_collection__Couple___second].val; /* _second on <var_i:Couple[Object, nullable Object]> */
+var10 = var12;
+RET_LABEL11:(void)0;
+}
+}
+if (var10 == NULL) {
+var13 = (var_item == NULL);
 } else {
-var9 = ((short int (*)(val*, val*))(var8->class->vft[COLOR_kernel__Object___61d_61d]))(var8, var_item) /* == on <var8:nullable Object>*/;
+var14 = ((short int (*)(val*, val*))(var10->class->vft[COLOR_kernel__Object___61d_61d]))(var10, var_item) /* == on <var10:nullable Object>*/;
+var13 = var14;
 }
-if (var9){
-var10 = 1;
-{ /* Inline kernel#Int#+ (var_nb,var10) */
-var13 = var_nb + var10;
-var11 = var13;
-goto RET_LABEL12;
-RET_LABEL12:(void)0;
+if (var13){
+var15 = 1;
+var = var15;
+goto RET_LABEL;
+} else {
+}
+{
+array__ArrayIterator__next(var_7); /* Direct call array#ArrayIterator#next on <var_7:ArrayIterator[Couple[Object, nullable Object]]>*/
 }
-var_nb = var11;
 } else {
+goto BREAK_label;
 }
-CONTINUE_label: (void)0;
-((void (*)(val*))(var5->class->vft[COLOR_abstract_collection__Iterator__next]))(var5) /* next on <var5:Iterator[nullable Object]>*/;
 }
 BREAK_label: (void)0;
-var = var_nb;
+{
+{ /* Inline abstract_collection#Iterator#finish (var_7) on <var_7:ArrayIterator[Couple[Object, nullable Object]]> */
+RET_LABEL16:(void)0;
+}
+}
+var17 = 0;
+var = var17;
 goto RET_LABEL;
 RET_LABEL:;
 return var;
 }
-/* method array#ArrayMapValues#count for (self: Object, nullable Object): Int */
-long VIRTUAL_array__ArrayMapValues__count(val* self, val* p0) {
-long var /* : Int */;
-long var1 /* : Int */;
-var1 = array__ArrayMapValues__count(self, p0);
+/* method array#ArrayMapValues#has for (self: Object, nullable Object): Bool */
+short int VIRTUAL_array__ArrayMapValues__has(val* self, val* p0) {
+short int var /* : Bool */;
+short int var1 /* : Bool */;
+var1 = array__ArrayMapValues__has(self, p0);
 var = var1;
 RET_LABEL:;
 return var;
@@ -5094,13 +5409,27 @@ return var;
 /* method array#ArrayMapValues#clear for (self: ArrayMapValues[Object, nullable Object]) */
 void array__ArrayMapValues__clear(val* self) {
 val* var /* : ArrayMap[Object, nullable Object] */;
-var = ((val* (*)(val*))(self->class->vft[COLOR_array__ArrayMapValues__map]))(self) /* map on <self:ArrayMapValues[Object, nullable Object]>*/;
-((void (*)(val*))(var->class->vft[COLOR_abstract_collection__Map__clear]))(var) /* clear on <var:ArrayMap[Object, nullable Object]>*/;
+val* var2 /* : ArrayMap[Object, nullable Object] */;
+{
+{ /* Inline array#ArrayMapValues#map (self) on <self:ArrayMapValues[Object, nullable Object]> */
+var2 = self->attrs[COLOR_array__ArrayMapValues___map].val; /* _map on <self:ArrayMapValues[Object, nullable Object]> */
+if (unlikely(var2 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _map");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 610);
+show_backtrace(1);
+}
+var = var2;
+RET_LABEL1:(void)0;
+}
+}
+{
+array__ArrayMap__clear(var); /* Direct call array#ArrayMap#clear on <var:ArrayMap[Object, nullable Object]>*/
+}
 RET_LABEL:;
 }
 /* method array#ArrayMapValues#clear for (self: Object) */
 void VIRTUAL_array__ArrayMapValues__clear(val* self) {
-array__ArrayMapValues__clear(self);
+array__ArrayMapValues__clear(self); /* Direct call array#ArrayMapValues#clear on <self:Object(ArrayMapValues[Object, nullable Object])>*/
 RET_LABEL:;
 }
 /* method array#ArrayMapValues#remove for (self: ArrayMapValues[Object, nullable Object], nullable Object) */
@@ -5110,30 +5439,44 @@ int cltype;
 int idtype;
 const struct type* type_struct;
 short int is_nullable;
+const char* var_class_name;
 val* var_item /* var item: nullable Object */;
 val* var1 /* : ArrayMap[Object, nullable Object] */;
+val* var3 /* : ArrayMap[Object, nullable Object] */;
 val* var_map /* var map: ArrayMap[Object, nullable Object] */;
-val* var2 /* : Array[Couple[Object, nullable Object]] */;
-long var3 /* : Int */;
-long var4 /* : Int */;
+val* var4 /* : Array[Couple[Object, nullable Object]] */;
 long var5 /* : Int */;
 long var7 /* : Int */;
-long var_i /* var i: Int */;
 long var8 /* : Int */;
-short int var9 /* : Bool */;
+long var9 /* : Int */;
 short int var11 /* : Bool */;
 int cltype12;
 int idtype13;
-short int var14 /* : Bool */;
-val* var15 /* : Array[Couple[Object, nullable Object]] */;
-val* var16 /* : nullable Object */;
-val* var17 /* : nullable Object */;
-short int var18 /* : Bool */;
-long var19 /* : Int */;
-long var20 /* : Int */;
-long var22 /* : Int */;
-/* Covariant cast for argument 0 (item) <p0:nullable Object> isa RemovableCollection#0 */
-/* <p0:nullable Object> isa RemovableCollection#0 */
+const char* var_class_name14;
+long var15 /* : Int */;
+long var_i /* var i: Int */;
+long var16 /* : Int */;
+short int var17 /* : Bool */;
+short int var19 /* : Bool */;
+int cltype20;
+int idtype21;
+const char* var_class_name22;
+short int var23 /* : Bool */;
+val* var24 /* : Array[Couple[Object, nullable Object]] */;
+val* var25 /* : nullable Object */;
+val* var26 /* : nullable Object */;
+val* var28 /* : nullable Object */;
+short int var29 /* : Bool */;
+short int var30 /* : Bool */;
+long var31 /* : Int */;
+long var32 /* : Int */;
+short int var34 /* : Bool */;
+int cltype35;
+int idtype36;
+const char* var_class_name37;
+long var38 /* : Int */;
+/* Covariant cast for argument 0 (item) <p0:nullable Object> isa E */
+/* <p0:nullable Object> isa E */
 type_struct = self->type->resolution_table->types[COLOR_abstract_collection__RemovableCollection_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -5147,219 +5490,153 @@ var = 0;
 var = p0->type->type_table[cltype] == idtype;
 }
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 651);
-exit(1);
+if (unlikely(!var)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "E", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 641);
+show_backtrace(1);
 }
 var_item = p0;
-var1 = ((val* (*)(val*))(self->class->vft[COLOR_array__ArrayMapValues__map]))(self) /* map on <self:ArrayMapValues[Object, nullable Object]>*/;
-var_map = var1;
-var2 = var_map->attrs[COLOR_array__ArrayMap___items].val; /* _items on <var_map:ArrayMap[Object, nullable Object]> */
-if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 654);
-exit(1);
+{
+{ /* Inline array#ArrayMapValues#map (self) on <self:ArrayMapValues[Object, nullable Object]> */
+var3 = self->attrs[COLOR_array__ArrayMapValues___map].val; /* _map on <self:ArrayMapValues[Object, nullable Object]> */
+if (unlikely(var3 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _map");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 610);
+show_backtrace(1);
 }
-var3 = ((long (*)(val*))(var2->class->vft[COLOR_abstract_collection__Collection__length]))(var2) /* length on <var2:Array[Couple[Object, nullable Object]]>*/;
-var4 = 1;
-{ /* Inline kernel#Int#- (var3,var4) */
-var7 = var3 - var4;
+var1 = var3;
+RET_LABEL2:(void)0;
+}
+}
+var_map = var1;
+var4 = var_map->attrs[COLOR_array__ArrayMap___items].val; /* _items on <var_map:ArrayMap[Object, nullable Object]> */
+if (unlikely(var4 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _items");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 644);
+show_backtrace(1);
+}
+{
+{ /* Inline array#AbstractArrayRead#length (var4) on <var4:Array[Couple[Object, nullable Object]]> */
+var7 = var4->attrs[COLOR_array__AbstractArrayRead___length].l; /* _length on <var4:Array[Couple[Object, nullable Object]]> */
 var5 = var7;
-goto RET_LABEL6;
 RET_LABEL6:(void)0;
 }
-var_i = var5;
-for(;;) {
-var8 = 0;
-{ /* Inline kernel#Int#>= (var_i,var8) */
+}
+var8 = 1;
+{
+{ /* Inline kernel#Int#- (var5,var8) on <var5:Int> */
 /* Covariant cast for argument 0 (i) <var8:Int> isa OTHER */
 /* <var8:Int> isa OTHER */
 var11 = 1; /* easy <var8:Int> isa OTHER*/
-if (!var11) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 258);
-exit(1);
-}
-var14 = var_i >= var8;
-var9 = var14;
+if (unlikely(!var11)) {
+var_class_name14 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name14);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 377);
+show_backtrace(1);
+}
+var15 = var5 - var8;
+var9 = var15;
 goto RET_LABEL10;
 RET_LABEL10:(void)0;
 }
-if (!var9) break;
-var15 = var_map->attrs[COLOR_array__ArrayMap___items].val; /* _items on <var_map:ArrayMap[Object, nullable Object]> */
-if (var15 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 656);
-exit(1);
 }
-var16 = ((val* (*)(val*, long))(var15->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(var15, var_i) /* [] on <var15:Array[Couple[Object, nullable Object]]>*/;
-var17 = ((val* (*)(val*))(var16->class->vft[COLOR_abstract_collection__Couple__second]))(var16) /* second on <var16:nullable Object(Couple[Object, nullable Object])>*/;
-if (var17 == NULL) {
-var18 = (var_item == NULL);
-} else {
-var18 = ((short int (*)(val*, val*))(var17->class->vft[COLOR_kernel__Object___61d_61d]))(var17, var_item) /* == on <var17:nullable Object>*/;
+var_i = var9;
+for(;;) {
+var16 = 0;
+{
+{ /* Inline kernel#Int#>= (var_i,var16) on <var_i:Int> */
+/* Covariant cast for argument 0 (i) <var16:Int> isa OTHER */
+/* <var16:Int> isa OTHER */
+var19 = 1; /* easy <var16:Int> isa OTHER*/
+if (unlikely(!var19)) {
+var_class_name22 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name22);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 372);
+show_backtrace(1);
+}
+var23 = var_i >= var16;
+var17 = var23;
+goto RET_LABEL18;
+RET_LABEL18:(void)0;
 }
-if (var18){
-((void (*)(val*, long))(var_map->class->vft[COLOR_array__ArrayMap__remove_at_index]))(var_map, var_i) /* remove_at_index on <var_map:ArrayMap[Object, nullable Object]>*/;
-goto RET_LABEL;
-} else {
 }
-var19 = 1;
-{ /* Inline kernel#Int#- (var_i,var19) */
-var22 = var_i - var19;
-var20 = var22;
-goto RET_LABEL21;
-RET_LABEL21:(void)0;
+if (var17){
+var24 = var_map->attrs[COLOR_array__ArrayMap___items].val; /* _items on <var_map:ArrayMap[Object, nullable Object]> */
+if (unlikely(var24 == NULL)) {
+PRINT_ERROR("Runtime error: %s", "Uninitialized attribute _items");
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 646);
+show_backtrace(1);
 }
-var_i = var20;
-CONTINUE_label: (void)0;
+{
+var25 = array__Array___91d_93d(var24, var_i);
 }
-BREAK_label: (void)0;
-RET_LABEL:;
+{
+{ /* Inline abstract_collection#Couple#second (var25) on <var25:nullable Object(Couple[Object, nullable Object])> */
+var28 = var25->attrs[COLOR_abstract_collection__Couple___second].val; /* _second on <var25:nullable Object(Couple[Object, nullable Object])> */
+var26 = var28;
+RET_LABEL27:(void)0;
 }
-/* method array#ArrayMapValues#remove for (self: Object, nullable Object) */
-void VIRTUAL_array__ArrayMapValues__remove(val* self, val* p0) {
-array__ArrayMapValues__remove(self, p0);
-RET_LABEL:;
 }
-/* method array#ArrayMapValues#remove_all for (self: ArrayMapValues[Object, nullable Object], nullable Object) */
-void array__ArrayMapValues__remove_all(val* self, val* p0) {
-short int var /* : Bool */;
-int cltype;
-int idtype;
-const struct type* type_struct;
-short int is_nullable;
-val* var_item /* var item: nullable Object */;
-val* var1 /* : ArrayMap[Object, nullable Object] */;
-val* var_map /* var map: ArrayMap[Object, nullable Object] */;
-val* var2 /* : Array[Couple[Object, nullable Object]] */;
-long var3 /* : Int */;
-long var4 /* : Int */;
-long var5 /* : Int */;
-long var7 /* : Int */;
-long var_i /* var i: Int */;
-long var8 /* : Int */;
-short int var9 /* : Bool */;
-short int var11 /* : Bool */;
-int cltype12;
-int idtype13;
-short int var14 /* : Bool */;
-val* var15 /* : Array[Couple[Object, nullable Object]] */;
-val* var16 /* : nullable Object */;
-val* var17 /* : nullable Object */;
-short int var18 /* : Bool */;
-long var19 /* : Int */;
-long var20 /* : Int */;
-long var22 /* : Int */;
-/* Covariant cast for argument 0 (item) <p0:nullable Object> isa RemovableCollection#0 */
-/* <p0:nullable Object> isa RemovableCollection#0 */
-type_struct = self->type->resolution_table->types[COLOR_abstract_collection__RemovableCollection_FT0];
-cltype = type_struct->color;
-idtype = type_struct->id;
-is_nullable = type_struct->is_nullable;
-if(p0 == NULL) {
-var = is_nullable;
-} else {
-if(cltype >= p0->type->table_size) {
-var = 0;
+if (var26 == NULL) {
+var29 = (var_item == NULL);
 } else {
-var = p0->type->type_table[cltype] == idtype;
-}
-}
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 664);
-exit(1);
-}
-var_item = p0;
-var1 = ((val* (*)(val*))(self->class->vft[COLOR_array__ArrayMapValues__map]))(self) /* map on <self:ArrayMapValues[Object, nullable Object]>*/;
-var_map = var1;
-var2 = var_map->attrs[COLOR_array__ArrayMap___items].val; /* _items on <var_map:ArrayMap[Object, nullable Object]> */
-if (var2 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 667);
-exit(1);
-}
-var3 = ((long (*)(val*))(var2->class->vft[COLOR_abstract_collection__Collection__length]))(var2) /* length on <var2:Array[Couple[Object, nullable Object]]>*/;
-var4 = 1;
-{ /* Inline kernel#Int#- (var3,var4) */
-var7 = var3 - var4;
-var5 = var7;
-goto RET_LABEL6;
-RET_LABEL6:(void)0;
+var30 = ((short int (*)(val*, val*))(var26->class->vft[COLOR_kernel__Object___61d_61d]))(var26, var_item) /* == on <var26:nullable Object>*/;
+var29 = var30;
 }
-var_i = var5;
-for(;;) {
-var8 = 0;
-{ /* Inline kernel#Int#>= (var_i,var8) */
-/* Covariant cast for argument 0 (i) <var8:Int> isa OTHER */
-/* <var8:Int> isa OTHER */
-var11 = 1; /* easy <var8:Int> isa OTHER*/
-if (!var11) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/kernel.nit", 258);
-exit(1);
+if (var29){
+{
+array__ArrayMap__remove_at_index(var_map, var_i); /* Direct call array#ArrayMap#remove_at_index on <var_map:ArrayMap[Object, nullable Object]>*/
 }
-var14 = var_i >= var8;
-var9 = var14;
-goto RET_LABEL10;
-RET_LABEL10:(void)0;
+goto RET_LABEL;
+} else {
 }
-if (!var9) break;
-var15 = var_map->attrs[COLOR_array__ArrayMap___items].val; /* _items on <var_map:ArrayMap[Object, nullable Object]> */
-if (var15 == NULL) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Uninitialized attribute _items", "lib/standard/collection/array.nit", 669);
-exit(1);
+var31 = 1;
+{
+{ /* Inline kernel#Int#- (var_i,var31) on <var_i:Int> */
+/* Covariant cast for argument 0 (i) <var31:Int> isa OTHER */
+/* <var31:Int> isa OTHER */
+var34 = 1; /* easy <var31:Int> isa OTHER*/
+if (unlikely(!var34)) {
+var_class_name37 = type_kernel__Int.name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "OTHER", var_class_name37);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/kernel.nit", 377);
+show_backtrace(1);
+}
+var38 = var_i - var31;
+var32 = var38;
+goto RET_LABEL33;
+RET_LABEL33:(void)0;
 }
-var16 = ((val* (*)(val*, long))(var15->class->vft[COLOR_abstract_collection__SequenceRead___91d_93d]))(var15, var_i) /* [] on <var15:Array[Couple[Object, nullable Object]]>*/;
-var17 = ((val* (*)(val*))(var16->class->vft[COLOR_abstract_collection__Couple__second]))(var16) /* second on <var16:nullable Object(Couple[Object, nullable Object])>*/;
-if (var17 == NULL) {
-var18 = (var_item == NULL);
-} else {
-var18 = ((short int (*)(val*, val*))(var17->class->vft[COLOR_kernel__Object___61d_61d]))(var17, var_item) /* == on <var17:nullable Object>*/;
 }
-if (var18){
-((void (*)(val*, long))(var_map->class->vft[COLOR_array__ArrayMap__remove_at_index]))(var_map, var_i) /* remove_at_index on <var_map:ArrayMap[Object, nullable Object]>*/;
+var_i = var32;
 } else {
+goto BREAK_label;
 }
-var19 = 1;
-{ /* Inline kernel#Int#- (var_i,var19) */
-var22 = var_i - var19;
-var20 = var22;
-goto RET_LABEL21;
-RET_LABEL21:(void)0;
-}
-var_i = var20;
-CONTINUE_label: (void)0;
 }
 BREAK_label: (void)0;
 RET_LABEL:;
 }
-/* method array#ArrayMapValues#remove_all for (self: Object, nullable Object) */
-void VIRTUAL_array__ArrayMapValues__remove_all(val* self, val* p0) {
-array__ArrayMapValues__remove_all(self, p0);
+/* method array#ArrayMapValues#remove for (self: Object, nullable Object) */
+void VIRTUAL_array__ArrayMapValues__remove(val* self, val* p0) {
+array__ArrayMapValues__remove(self, p0); /* Direct call array#ArrayMapValues#remove on <self:Object(ArrayMapValues[Object, nullable Object])>*/
 RET_LABEL:;
 }
-/* method array#ArrayMapValues#init for (self: ArrayMapValues[Object, nullable Object], ArrayMap[Object, nullable Object]) */
-void array__ArrayMapValues__init(val* self, val* p0) {
-short int var /* : Bool */;
-int cltype;
-int idtype;
-const struct type* type_struct;
-/* Covariant cast for argument 0 (map) <p0:ArrayMap[Object, nullable Object]> isa ArrayMap[ArrayMapValues#0, ArrayMapValues#1] */
-/* <p0:ArrayMap[Object, nullable Object]> isa ArrayMap[ArrayMapValues#0, ArrayMapValues#1] */
-type_struct = self->type->resolution_table->types[COLOR_array__ArrayMaparray__ArrayMapValues_FT0array__ArrayMapValues_FT1];
-cltype = type_struct->color;
-idtype = type_struct->id;
-if(cltype >= p0->type->table_size) {
-var = 0;
-} else {
-var = p0->type->type_table[cltype] == idtype;
-}
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 618);
-exit(1);
+/* method array#ArrayMapValues#init for (self: ArrayMapValues[Object, nullable Object]) */
+void array__ArrayMapValues__init(val* self) {
+{
+((void (*)(val*))(self->class->vft[COLOR_array__ArrayMapValues__init]))(self) /* init on <self:ArrayMapValues[Object, nullable Object]>*/;
 }
-self->attrs[COLOR_array__ArrayMapValues___64dmap].val = p0; /* @map on <self:ArrayMapValues[Object, nullable Object]> */
 RET_LABEL:;
 }
-/* method array#ArrayMapValues#init for (self: Object, ArrayMap[Object, nullable Object]) */
-void VIRTUAL_array__ArrayMapValues__init(val* self, val* p0) {
-array__ArrayMapValues__init(self, p0);
+/* method array#ArrayMapValues#init for (self: Object) */
+void VIRTUAL_array__ArrayMapValues__init(val* self) {
+{ /* Inline array#ArrayMapValues#init (self) on <self:Object(ArrayMapValues[Object, nullable Object])> */
+{
+((void (*)(val*))(self->class->vft[COLOR_array__ArrayMapValues__init]))(self) /* init on <self:Object(ArrayMapValues[Object, nullable Object])>*/;
+}
+RET_LABEL1:(void)0;
+}
 RET_LABEL:;
 }
 /* method array#Iterator#to_a for (self: Iterator[nullable Object]): Array[nullable Object] */
@@ -5370,16 +5647,27 @@ val* var_res /* var res: Array[nullable Object] */;
 short int var2 /* : Bool */;
 val* var3 /* : nullable Object */;
 var1 = NEW_array__Array(self->type->resolution_table->types[COLOR_array__Arrayabstract_collection__Iterator_FT0]);
-((void (*)(val*))(var1->class->vft[COLOR_array__Array__init]))(var1) /* init on <var1:Array[nullable Object]>*/;
-CHECK_NEW_array__Array(var1);
+{
+((void (*)(val*))(var1->class->vft[COLOR_kernel__Object__init]))(var1) /* init on <var1:Array[nullable Object]>*/;
+}
 var_res = var1;
 for(;;) {
+{
 var2 = ((short int (*)(val*))(self->class->vft[COLOR_abstract_collection__Iterator__is_ok]))(self) /* is_ok on <self:Iterator[nullable Object]>*/;
-if (!var2) break;
+}
+if (var2){
+{
 var3 = ((val* (*)(val*))(self->class->vft[COLOR_abstract_collection__Iterator__item]))(self) /* item on <self:Iterator[nullable Object]>*/;
-((void (*)(val*, val*))(var_res->class->vft[COLOR_abstract_collection__SimpleCollection__add]))(var_res, var3) /* add on <var_res:Array[nullable Object]>*/;
+}
+{
+array__Array__add(var_res, var3); /* Direct call array#Array#add on <var_res:Array[nullable Object]>*/
+}
+{
 ((void (*)(val*))(self->class->vft[COLOR_abstract_collection__Iterator__next]))(self) /* next on <self:Iterator[nullable Object]>*/;
-CONTINUE_label: (void)0;
+}
+} else {
+goto BREAK_label;
+}
 }
 BREAK_label: (void)0;
 var = var_res;
@@ -5399,11 +5687,21 @@ return var;
 /* method array#Collection#to_a for (self: Collection[nullable Object]): Array[nullable Object] */
 val* array__Collection__to_a(val* self) {
 val* var /* : Array[nullable Object] */;
-val* var1 /* : Iterator[nullable Object] */;
-val* var2 /* : Array[nullable Object] */;
-var1 = ((val* (*)(val*))(self->class->vft[COLOR_abstract_collection__Collection__iterator]))(self) /* iterator on <self:Collection[nullable Object]>*/;
-var2 = ((val* (*)(val*))(var1->class->vft[COLOR_array__Iterator__to_a]))(var1) /* to_a on <var1:Iterator[nullable Object]>*/;
-var = var2;
+val* var1 /* : Array[nullable Object] */;
+long var2 /* : Int */;
+val* var_res /* var res: Array[nullable Object] */;
+var1 = NEW_array__Array(self->type->resolution_table->types[COLOR_array__Arrayabstract_collection__Collection_FT0]);
+{
+var2 = ((long (*)(val*))(self->class->vft[COLOR_abstract_collection__Collection__length]))(self) /* length on <self:Collection[nullable Object]>*/;
+}
+{
+array__Array__with_capacity(var1, var2); /* Direct call array#Array#with_capacity on <var1:Array[nullable Object]>*/
+}
+var_res = var1;
+{
+abstract_collection__SimpleCollection__add_all(var_res, self); /* Direct call abstract_collection#SimpleCollection#add_all on <var_res:Array[nullable Object]>*/
+}
+var = var_res;
 goto RET_LABEL;
 RET_LABEL:;
 return var;
@@ -5432,7 +5730,7 @@ val* VIRTUAL_array__ArrayCapable__calloc_array(val* self, long p0) {
 val* var /* : NativeArray[nullable Object] */;
 val* var1 /* : NativeArray[nullable Object] */;
 val* var3 /* : NativeArray[nullable Object] */;
-{ /* Inline array#ArrayCapable#calloc_array (self,p0) */
+{ /* Inline array#ArrayCapable#calloc_array (self,p0) on <self:Object(ArrayCapable[nullable Object])> */
 var3 = NEW_array__NativeArray(p0, self->type->resolution_table->types[COLOR_array__NativeArrayarray__ArrayCapable_FT0]);
 var1 = var3;
 goto RET_LABEL2;
@@ -5442,6 +5740,23 @@ var = var1;
 RET_LABEL:;
 return var;
 }
+/* method array#NativeArray#new for (self: NativeArray[nullable Object], Int): NativeArray[nullable Object] */
+val* array__NativeArray__new(val* self, long p0) {
+val* var /* : NativeArray[nullable Object] */;
+RET_LABEL:;
+return var;
+}
+/* method array#NativeArray#new for (self: Object, Int): NativeArray[nullable Object] */
+val* VIRTUAL_array__NativeArray__new(val* self, long p0) {
+val* var /* : NativeArray[nullable Object] */;
+val* var1 /* : NativeArray[nullable Object] */;
+{ /* Inline array#NativeArray#new (self,p0) on <self:Object(NativeArray[nullable Object])> */
+RET_LABEL2:(void)0;
+}
+var = var1;
+RET_LABEL:;
+return var;
+}
 /* method array#NativeArray#[] for (self: NativeArray[nullable Object], Int): nullable Object */
 val* array__NativeArray___91d_93d(val* self, long p0) {
 val* var /* : nullable Object */;
@@ -5457,7 +5772,7 @@ val* VIRTUAL_array__NativeArray___91d_93d(val* self, long p0) {
 val* var /* : nullable Object */;
 val* var1 /* : nullable Object */;
 val* var3 /* : nullable Object */;
-{ /* Inline array#NativeArray#[] (self,p0) */
+{ /* Inline array#NativeArray#[] (self,p0) on <self:Object(NativeArray[nullable Object])> */
 var3 = ((struct instance_array__NativeArray*)self)->values[p0];
 var1 = var3;
 goto RET_LABEL2;
@@ -5474,8 +5789,9 @@ int cltype;
 int idtype;
 const struct type* type_struct;
 short int is_nullable;
-/* Covariant cast for argument 1 (item) <p1:nullable Object> isa NativeArray#0 */
-/* <p1:nullable Object> isa NativeArray#0 */
+const char* var_class_name;
+/* Covariant cast for argument 1 (item) <p1:nullable Object> isa E */
+/* <p1:nullable Object> isa E */
 type_struct = self->type->resolution_table->types[COLOR_array__NativeArray_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -5489,9 +5805,11 @@ var = 0;
 var = p1->type->type_table[cltype] == idtype;
 }
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 712);
-exit(1);
+if (unlikely(!var)) {
+var_class_name = p1 == NULL ? "null" : p1->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "E", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 778);
+show_backtrace(1);
 }
 ((struct instance_array__NativeArray*)self)->values[p0]=p1;
 RET_LABEL:;
@@ -5503,9 +5821,10 @@ int cltype;
 int idtype;
 const struct type* type_struct;
 short int is_nullable;
-{ /* Inline array#NativeArray#[]= (self,p0,p1) */
-/* Covariant cast for argument 1 (item) <p1:nullable Object> isa NativeArray#0 */
-/* <p1:nullable Object> isa NativeArray#0 */
+const char* var_class_name;
+{ /* Inline array#NativeArray#[]= (self,p0,p1) on <self:Object(NativeArray[nullable Object])> */
+/* Covariant cast for argument 1 (item) <p1:nullable Object> isa E */
+/* <p1:nullable Object> isa E */
 type_struct = self->type->resolution_table->types[COLOR_array__NativeArray_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -5519,9 +5838,11 @@ var = 0;
 var = p1->type->type_table[cltype] == idtype;
 }
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 712);
-exit(1);
+if (unlikely(!var)) {
+var_class_name = p1 == NULL ? "null" : p1->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "E", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 778);
+show_backtrace(1);
 }
 ((struct instance_array__NativeArray*)self)->values[p0]=p1;
 RET_LABEL1:(void)0;
@@ -5534,8 +5855,9 @@ short int var /* : Bool */;
 int cltype;
 int idtype;
 const struct type* type_struct;
-/* Covariant cast for argument 0 (dest) <p0:NativeArray[nullable Object]> isa NativeArray[NativeArray#0] */
-/* <p0:NativeArray[nullable Object]> isa NativeArray[NativeArray#0] */
+const char* var_class_name;
+/* Covariant cast for argument 0 (dest) <p0:NativeArray[nullable Object]> isa NativeArray[E] */
+/* <p0:NativeArray[nullable Object]> isa NativeArray[E] */
 type_struct = self->type->resolution_table->types[COLOR_array__NativeArrayarray__NativeArray_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -5544,11 +5866,13 @@ var = 0;
 } else {
 var = p0->type->type_table[cltype] == idtype;
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 713);
-exit(1);
+if (unlikely(!var)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "NativeArray[E]", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 779);
+show_backtrace(1);
 }
-memcpy(((struct instance_array__NativeArray*)p0)->values, ((struct instance_array__NativeArray*)self)->values, p1*sizeof(val*));
+memmove(((struct instance_array__NativeArray*)p0)->values, ((struct instance_array__NativeArray*)self)->values, p1*sizeof(val*));
 RET_LABEL:;
 }
 /* method array#NativeArray#copy_to for (self: Object, NativeArray[nullable Object], Int) */
@@ -5557,9 +5881,10 @@ short int var /* : Bool */;
 int cltype;
 int idtype;
 const struct type* type_struct;
-{ /* Inline array#NativeArray#copy_to (self,p0,p1) */
-/* Covariant cast for argument 0 (dest) <p0:NativeArray[nullable Object]> isa NativeArray[NativeArray#0] */
-/* <p0:NativeArray[nullable Object]> isa NativeArray[NativeArray#0] */
+const char* var_class_name;
+{ /* Inline array#NativeArray#copy_to (self,p0,p1) on <self:Object(NativeArray[nullable Object])> */
+/* Covariant cast for argument 0 (dest) <p0:NativeArray[nullable Object]> isa NativeArray[E] */
+/* <p0:NativeArray[nullable Object]> isa NativeArray[E] */
 type_struct = self->type->resolution_table->types[COLOR_array__NativeArrayarray__NativeArray_FT0];
 cltype = type_struct->color;
 idtype = type_struct->id;
@@ -5568,11 +5893,13 @@ var = 0;
 } else {
 var = p0->type->type_table[cltype] == idtype;
 }
-if (!var) {
-fprintf(stderr, "Runtime error: %s (%s:%d)\n", "Cast failed", "lib/standard/collection/array.nit", 713);
-exit(1);
+if (unlikely(!var)) {
+var_class_name = p0 == NULL ? "null" : p0->type->name;
+PRINT_ERROR("Runtime error: Cast failed. Expected `%s`, got `%s`", "NativeArray[E]", var_class_name);
+PRINT_ERROR(" (%s:%d)\n", "../lib/standard/collection/array.nit", 779);
+show_backtrace(1);
 }
-memcpy(((struct instance_array__NativeArray*)p0)->values, ((struct instance_array__NativeArray*)self)->values, p1*sizeof(val*));
+memmove(((struct instance_array__NativeArray*)p0)->values, ((struct instance_array__NativeArray*)self)->values, p1*sizeof(val*));
 RET_LABEL1:(void)0;
 }
 RET_LABEL:;