tests: add << and >> in test_operators.nit
[nit.git] / c_src / control_flow._sep.c
index 0186721..6d4fe53 100644 (file)
 /* This C file is generated by NIT to compile module control_flow. */
 #include "control_flow._sep.h"
-void control_flow___MMSrcModule___do_control_flow(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 23, LOCATE_control_flow___MMSrcModule___do_control_flow};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 =  param0;
-  variable2 = NEW_control_flow___ControlFlowVisitor___init( variable0 /*tc*/,  self); /*new ControlFlowVisitor*/
-  variable1 = variable2;
-  variable2 = ((syntax_base___MMSrcModule___node_t)CALL( self,COLOR_syntax_base___MMSrcModule___node))( self) /*MMSrcModule::node*/;
-  ((control_flow___ControlFlowVisitor___visit_t)CALL( variable1 /*tv*/,COLOR_parser_prod___Visitor___visit))( variable1 /*tv*/, variable2) /*ControlFlowVisitor::visit*/;
-  tracehead = trace.prev;
-  return;
-}
-void control_flow___ControlFlowVisitor___visit(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 38, LOCATE_control_flow___ControlFlowVisitor___visit};
-  val_t variable0;
-  val_t variable1;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 =  param0;
-  variable1 = TAG_Bool(!UNTAG_Bool(TAG_Bool(( variable0 /*n*/ ==  NIT_NULL /*null*/) || (( variable0 /*n*/ != NIT_NULL) && ((((kernel___Object_____eqeq_t)CALL( variable0 /*n*/,COLOR_kernel___Object_____eqeq))==kernel___Object_____eqeq)?(IS_EQUAL_NN( variable0 /*n*/, NIT_NULL /*null*/)):(UNTAG_Bool(((kernel___Object_____eqeq_t)CALL( variable0 /*n*/,COLOR_kernel___Object_____eqeq))( variable0 /*n*/,  NIT_NULL /*null*/) /*Object::==*/)))))));
-  if (UNTAG_Bool(variable1)) { /*if*/
-    ((control_flow___PNode___accept_control_flow_t)CALL( variable0 /*n*/,COLOR_control_flow___PNode___accept_control_flow))( variable0 /*n*/,  self) /*PNode::accept_control_flow*/;
-  }
-  tracehead = trace.prev;
-  return;
-}
-val_t control_flow___ControlFlowVisitor___once_count(val_t  self) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 43, LOCATE_control_flow___ControlFlowVisitor___once_count};
-  trace.prev = tracehead; tracehead = &trace;
-  tracehead = trace.prev;
-  return ATTR_control_flow___ControlFlowVisitor____once_count( self) /*ControlFlowVisitor::_once_count*/;
-}
-void control_flow___ControlFlowVisitor___once_count__eq(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 43, LOCATE_control_flow___ControlFlowVisitor___once_count__eq};
-  trace.prev = tracehead; tracehead = &trace;
-  ATTR_control_flow___ControlFlowVisitor____once_count( self) /*ControlFlowVisitor::_once_count*/ =  param0;
-  tracehead = trace.prev;
-  return;
-}
-val_t control_flow___ControlFlowVisitor___control_flow_ctx(val_t  self) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 46, LOCATE_control_flow___ControlFlowVisitor___control_flow_ctx};
-  trace.prev = tracehead; tracehead = &trace;
-  tracehead = trace.prev;
-  return ATTR_control_flow___ControlFlowVisitor____control_flow_ctx( self) /*ControlFlowVisitor::_control_flow_ctx*/;
-}
-void control_flow___ControlFlowVisitor___control_flow_ctx__eq(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 46, LOCATE_control_flow___ControlFlowVisitor___control_flow_ctx__eq};
-  trace.prev = tracehead; tracehead = &trace;
-  ATTR_control_flow___ControlFlowVisitor____control_flow_ctx( self) /*ControlFlowVisitor::_control_flow_ctx*/ =  param0;
-  tracehead = trace.prev;
-  return;
-}
-void control_flow___ControlFlowVisitor___check_is_set(val_t  self, val_t  param0, val_t  param1) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 49, LOCATE_control_flow___ControlFlowVisitor___check_is_set};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-    val_t variable3;
-    val_t variable4;
-    val_t variable5;
-    val_t variable6;
-    val_t variable7;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 =  param0;
-  variable1 =  param1;
-  variable2 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( self,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( self) /*ControlFlowVisitor::control_flow_ctx*/;
-  variable2 = ((control_flow___ControlFlowContext___is_set_t)CALL(variable2,COLOR_control_flow___ControlFlowContext___is_set))(variable2,  variable1 /*v*/) /*ControlFlowContext::is_set*/;
-  if (UNTAG_Bool( TAG_Bool(!UNTAG_Bool(variable2)))) { /*if*/
-    variable2 = NEW_string___String___init(); /*new String*/
-    variable3 = NEW_string___String___with_native(BOX_NativeString("Error: variable '"), TAG_Int(17)); /*new String*/
-    variable4 = variable3;
-    ((string___String___append_t)CALL(variable2,COLOR_abstract_collection___IndexedCollection___append))(variable2, variable4) /*String::append*/;
-    variable5 =  variable1 /*v*/;
-    variable5 = ((string___String___to_s_t)CALL(variable5,COLOR_string___Object___to_s))(variable5) /*String::to_s*/;
-    ((string___String___append_t)CALL(variable2,COLOR_abstract_collection___IndexedCollection___append))(variable2, variable5) /*String::append*/;
-    variable6 = NEW_string___String___with_native(BOX_NativeString("' is possibly unset."), TAG_Int(20)); /*new String*/
-    variable7 = variable6;
-    ((string___String___append_t)CALL(variable2,COLOR_abstract_collection___IndexedCollection___append))(variable2, variable7) /*String::append*/;
-    ((syntax_base___AbsSyntaxVisitor___error_t)CALL( self,COLOR_syntax_base___AbsSyntaxVisitor___error))( self,  variable0 /*n*/, variable2) /*AbsSyntaxVisitor::error*/;
-    variable3 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( self,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( self) /*ControlFlowVisitor::control_flow_ctx*/;
-    variable2 = variable3;
-    while (true) { /*while*/
-      variable3 = TAG_Bool(!UNTAG_Bool(TAG_Bool(( variable2 /*cfc*/ ==  NIT_NULL /*null*/) || (( variable2 /*cfc*/ != NIT_NULL) && ((((kernel___Object_____eqeq_t)CALL( variable2 /*cfc*/,COLOR_kernel___Object_____eqeq))==kernel___Object_____eqeq)?(IS_EQUAL_NN( variable2 /*cfc*/, NIT_NULL /*null*/)):(UNTAG_Bool(((kernel___Object_____eqeq_t)CALL( variable2 /*cfc*/,COLOR_kernel___Object_____eqeq))( variable2 /*cfc*/,  NIT_NULL /*null*/) /*Object::==*/)))))));
-      if (!UNTAG_Bool(variable3)) break; /* while*/
-      variable3 = NEW_string___String___with_native(BOX_NativeString("cfc: "), TAG_Int(5)); /*new String*/
-      variable4 = ((control_flow___ControlFlowContext___set_variables_t)CALL( variable2 /*cfc*/,COLOR_control_flow___ControlFlowContext___set_variables))( variable2 /*cfc*/) /*ControlFlowContext::set_variables*/;
-      variable5 = NEW_string___String___with_native(BOX_NativeString(" "), TAG_Int(1)); /*new String*/
-      variable4 = ((string___Collection___join_t)CALL(variable4,COLOR_string___Collection___join))(variable4, variable5) /*Collection::join*/;
-      variable3 = ((string___String_____plus_t)CALL(variable3,COLOR_string___String_____plus))(variable3, variable4) /*String::+*/;
-      ((file___Object___print_t)CALL( self,COLOR_file___Object___print))( self, variable3) /*Object::print*/;
-      variable3 = ((control_flow___ControlFlowContext___prev_t)CALL( variable2 /*cfc*/,COLOR_control_flow___ControlFlowContext___prev))( variable2 /*cfc*/) /*ControlFlowContext::prev*/;
-      variable2 = variable3 /*cfc=*/;
-      continue_3: while(0);
+val_t control_flow___VariableContext___to_s(val_t p0){
+  struct {struct stack_frame_t me; val_t MORE_REG[6];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t tmp;
+      static val_t once_value_2; /* Once value */
+      static val_t once_value_3; /* Once value */
+      static val_t once_value_4; /* Once value */
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 179;
+  fra.me.meth = LOCATE_control_flow___VariableContext___to_s;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 7;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[3] = NIT_NULL;
+  fra.me.REG[4] = NIT_NULL;
+  fra.me.REG[5] = NIT_NULL;
+  fra.me.REG[6] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = NEW_Buffer_string___Buffer___init();
+  fra.me.REG[2] = CALL_control_flow___VariableContext___node(fra.me.REG[0])(fra.me.REG[0]);
+  fra.me.REG[2] = CALL_parser_nodes___ANode___location(fra.me.REG[2])(fra.me.REG[2]);
+  fra.me.REG[2] = CALL_string___Object___to_s(fra.me.REG[2])(fra.me.REG[2]);
+  /* ./syntax//control_flow.nit:182 */
+  CALL_abstract_collection___Sequence___append(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
+  REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____all_variables(fra.me.REG[0])!=NIT_NULL);
+  /* ./syntax//control_flow.nit:183 */
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    fprintf(stderr, "Uninitialized attribute %s", "_all_variables");
+    fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 183);
+    nit_exit(1);
+  }
+  fra.me.REG[2] = ATTR_control_flow___VariableContext____all_variables(fra.me.REG[0]);
+  fra.me.REG[2] = CALL_abstract_collection___Collection___iterator(fra.me.REG[2])(fra.me.REG[2]);
+  while(1) {
+    REGB0 = CALL_abstract_collection___Iterator___is_ok(fra.me.REG[2])(fra.me.REG[2]);
+    if (UNTAG_Bool(REGB0)) {
+      fra.me.REG[3] = CALL_abstract_collection___Iterator___item(fra.me.REG[2])(fra.me.REG[2]);
+      fra.me.REG[4] = CALL_control_flow___VariableContext___stype(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[3]);
+      REGB0 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
+      /* ./syntax//control_flow.nit:185 */
+      if (UNTAG_Bool(REGB0)) {
+      } else {
+        REGB1 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
+        if (UNTAG_Bool(REGB1)) {
+          REGB1 = TAG_Bool(false);
+          REGB0 = REGB1;
+        } else {
+          REGB1 = CALL_kernel___Object_____eqeq(fra.me.REG[4])(fra.me.REG[4], NIT_NULL);
+          REGB0 = REGB1;
+        }
+      }
+      if (UNTAG_Bool(REGB0)) {
+        goto label1;
+      }
+      REGB0 = TAG_Int(5);
+      fra.me.REG[5] = NEW_Array_array___Array___with_capacity(REGB0);
+      /* ./syntax//control_flow.nit:186 */
+      if (!once_value_2) {
+        fra.me.REG[6] = BOX_NativeString(" ");
+        REGB0 = TAG_Int(1);
+        fra.me.REG[6] = NEW_String_string___String___with_native(fra.me.REG[6], REGB0);
+        once_value_2 = fra.me.REG[6];
+        register_static_object(&once_value_2);
+      } else fra.me.REG[6] = once_value_2;
+      array___Array___add(fra.me.REG[5], fra.me.REG[6]);
+      fra.me.REG[3] = CALL_string___Object___to_s(fra.me.REG[3])(fra.me.REG[3]);
+      array___Array___add(fra.me.REG[5], fra.me.REG[3]);
+      if (!once_value_3) {
+        fra.me.REG[3] = BOX_NativeString(":");
+        REGB0 = TAG_Int(1);
+        fra.me.REG[3] = NEW_String_string___String___with_native(fra.me.REG[3], REGB0);
+        once_value_3 = fra.me.REG[3];
+        register_static_object(&once_value_3);
+      } else fra.me.REG[3] = once_value_3;
+      array___Array___add(fra.me.REG[5], fra.me.REG[3]);
+      fra.me.REG[4] = CALL_string___Object___to_s(fra.me.REG[4])(fra.me.REG[4]);
+      array___Array___add(fra.me.REG[5], fra.me.REG[4]);
+      if (!once_value_4) {
+        fra.me.REG[4] = BOX_NativeString("");
+        REGB0 = TAG_Int(0);
+        fra.me.REG[4] = NEW_String_string___String___with_native(fra.me.REG[4], REGB0);
+        once_value_4 = fra.me.REG[4];
+        register_static_object(&once_value_4);
+      } else fra.me.REG[4] = once_value_4;
+      array___Array___add(fra.me.REG[5], fra.me.REG[4]);
+      fra.me.REG[5] = CALL_string___Object___to_s(fra.me.REG[5])(fra.me.REG[5]);
+      CALL_abstract_collection___Sequence___append(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[5]);
+      label1: while(0);
+    } else {
+      /* ./syntax//control_flow.nit:183 */
+      goto label5;
     }
-    break_3: while(0);
+    CALL_abstract_collection___Iterator___next(fra.me.REG[2])(fra.me.REG[2]);
   }
-  tracehead = trace.prev;
-  return;
+  label5: while(0);
+  fra.me.REG[1] = CALL_string___Object___to_s(fra.me.REG[1])(fra.me.REG[1]);
+  /* ./syntax//control_flow.nit:188 */
+  goto label6;
+  label6: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[1];
 }
-void control_flow___ControlFlowVisitor___mark_is_set(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 61, LOCATE_control_flow___ControlFlowVisitor___mark_is_set};
-  val_t variable0;
-  val_t variable1;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 =  param0;
-  variable1 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( self,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( self) /*ControlFlowVisitor::control_flow_ctx*/;
-  variable1 = ((control_flow___ControlFlowContext___set_variables_t)CALL(variable1,COLOR_control_flow___ControlFlowContext___set_variables))(variable1) /*ControlFlowContext::set_variables*/;
-  ((hash___HashSet___add_t)CALL(variable1,COLOR_abstract_collection___SimpleCollection___add))(variable1,  variable0 /*v*/) /*HashSet::add*/;
-  tracehead = trace.prev;
-  return;
+val_t control_flow___VariableContext_____bra(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[2];} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 25;
+  fra.me.meth = LOCATE_control_flow___VariableContext_____bra;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 3;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____dico(fra.me.REG[0])!=NIT_NULL);
+  /* ./syntax//control_flow.nit:29 */
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    fprintf(stderr, "Uninitialized attribute %s", "_dico");
+    fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 29);
+    nit_exit(1);
+  }
+  fra.me.REG[2] = ATTR_control_flow___VariableContext____dico(fra.me.REG[0]);
+  REGB0 = CALL_abstract_collection___MapRead___has_key(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[1]);
+  if (UNTAG_Bool(REGB0)) {
+    REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____dico(fra.me.REG[0])!=NIT_NULL);
+    /* ./syntax//control_flow.nit:30 */
+    if (UNTAG_Bool(REGB0)) {
+    } else {
+      fprintf(stderr, "Uninitialized attribute %s", "_dico");
+      fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 30);
+      nit_exit(1);
+    }
+    fra.me.REG[0] = ATTR_control_flow___VariableContext____dico(fra.me.REG[0]);
+    fra.me.REG[1] = CALL_abstract_collection___MapRead_____bra(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
+    goto label1;
+  } else {
+    fra.me.REG[1] = NIT_NULL;
+    /* ./syntax//control_flow.nit:32 */
+    goto label1;
+  }
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[1];
 }
-void control_flow___ControlFlowVisitor___init(val_t  self, val_t  param0, val_t  param1, int* init_table) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 66, LOCATE_control_flow___ControlFlowVisitor___init};
-  val_t variable0;
-  val_t variable1;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 =  param0;
-  variable1 =  param1;
-  if (init_table[VAL2OBJ( self)->vft[INIT_TABLE_POS_ControlFlowVisitor].i]) return;
-  ((syntax_base___AbsSyntaxVisitor___init_t)CALL( self,COLOR_syntax_base___AbsSyntaxVisitor___init))( self,  param0,  param1, init_table /*YYY*/) /*AbsSyntaxVisitor::init*/;
-  init_table[VAL2OBJ( self)->vft[INIT_TABLE_POS_ControlFlowVisitor].i] = 1;
-  tracehead = trace.prev;
+void control_flow___VariableContext___add(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[6];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t tmp;
+    static val_t once_value_1; /* Once value */
+    static val_t once_value_2; /* Once value */
+    static val_t once_value_3; /* Once value */
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 36;
+  fra.me.meth = LOCATE_control_flow___VariableContext___add;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 7;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[3] = NIT_NULL;
+  fra.me.REG[4] = NIT_NULL;
+  fra.me.REG[5] = NIT_NULL;
+  fra.me.REG[6] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  fra.me.REG[2] = CALL_syntax_base___Variable___name(fra.me.REG[1])(fra.me.REG[1]);
+  fra.me.REG[2] = CALL_control_flow___VariableContext_____bra(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[2]);
+  REGB0 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
+  /* ./syntax//control_flow.nit:40 */
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    REGB1 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
+    if (UNTAG_Bool(REGB1)) {
+      REGB1 = TAG_Bool(false);
+      REGB0 = REGB1;
+    } else {
+      REGB1 = CALL_kernel___Object_____eqeq(fra.me.REG[2])(fra.me.REG[2], NIT_NULL);
+      REGB0 = REGB1;
+    }
+  }
+  REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
+  if (UNTAG_Bool(REGB0)) {
+    REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____visitor(fra.me.REG[0])!=NIT_NULL);
+    /* ./syntax//control_flow.nit:41 */
+    if (UNTAG_Bool(REGB0)) {
+    } else {
+      fprintf(stderr, "Uninitialized attribute %s", "_visitor");
+      fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 41);
+      nit_exit(1);
+    }
+    fra.me.REG[3] = ATTR_control_flow___VariableContext____visitor(fra.me.REG[0]);
+    fra.me.REG[4] = CALL_syntax_base___Variable___decl(fra.me.REG[1])(fra.me.REG[1]);
+    REGB0 = TAG_Int(5);
+    fra.me.REG[5] = NEW_Array_array___Array___with_capacity(REGB0);
+    if (!once_value_1) {
+      fra.me.REG[6] = BOX_NativeString("Error: '");
+      REGB0 = TAG_Int(8);
+      fra.me.REG[6] = NEW_String_string___String___with_native(fra.me.REG[6], REGB0);
+      once_value_1 = fra.me.REG[6];
+      register_static_object(&once_value_1);
+    } else fra.me.REG[6] = once_value_1;
+    array___Array___add(fra.me.REG[5], fra.me.REG[6]);
+    fra.me.REG[6] = CALL_string___Object___to_s(fra.me.REG[1])(fra.me.REG[1]);
+    array___Array___add(fra.me.REG[5], fra.me.REG[6]);
+    if (!once_value_2) {
+      fra.me.REG[6] = BOX_NativeString("' already defined at ");
+      REGB0 = TAG_Int(21);
+      fra.me.REG[6] = NEW_String_string___String___with_native(fra.me.REG[6], REGB0);
+      once_value_2 = fra.me.REG[6];
+      register_static_object(&once_value_2);
+    } else fra.me.REG[6] = once_value_2;
+    array___Array___add(fra.me.REG[5], fra.me.REG[6]);
+    REGB0 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
+    if (UNTAG_Bool(REGB0)) {
+      fprintf(stderr, "Reciever is null");
+      fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 41);
+      nit_exit(1);
+    }
+    fra.me.REG[2] = CALL_syntax_base___Variable___decl(fra.me.REG[2])(fra.me.REG[2]);
+    REGB0 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
+    if (UNTAG_Bool(REGB0)) {
+      fprintf(stderr, "Reciever is null");
+      fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 41);
+      nit_exit(1);
+    }
+    fra.me.REG[2] = CALL_parser_nodes___ANode___location(fra.me.REG[2])(fra.me.REG[2]);
+    fra.me.REG[6] = CALL_syntax_base___Variable___decl(fra.me.REG[1])(fra.me.REG[1]);
+    REGB0 = TAG_Bool(fra.me.REG[6]==NIT_NULL);
+    if (UNTAG_Bool(REGB0)) {
+      fprintf(stderr, "Reciever is null");
+      fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 41);
+      nit_exit(1);
+    }
+    fra.me.REG[6] = CALL_parser_nodes___ANode___location(fra.me.REG[6])(fra.me.REG[6]);
+    fra.me.REG[6] = CALL_location___Location___relative_to(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[6]);
+    array___Array___add(fra.me.REG[5], fra.me.REG[6]);
+    if (!once_value_3) {
+      fra.me.REG[6] = BOX_NativeString(".");
+      REGB0 = TAG_Int(1);
+      fra.me.REG[6] = NEW_String_string___String___with_native(fra.me.REG[6], REGB0);
+      once_value_3 = fra.me.REG[6];
+      register_static_object(&once_value_3);
+    } else fra.me.REG[6] = once_value_3;
+    array___Array___add(fra.me.REG[5], fra.me.REG[6]);
+    fra.me.REG[5] = CALL_string___Object___to_s(fra.me.REG[5])(fra.me.REG[5]);
+    CALL_syntax_base___AbsSyntaxVisitor___error(fra.me.REG[3])(fra.me.REG[3], fra.me.REG[4], fra.me.REG[5]);
+  }
+  REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____dico(fra.me.REG[0])!=NIT_NULL);
+  /* ./syntax//control_flow.nit:43 */
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    fprintf(stderr, "Uninitialized attribute %s", "_dico");
+    fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 43);
+    nit_exit(1);
+  }
+  fra.me.REG[5] = ATTR_control_flow___VariableContext____dico(fra.me.REG[0]);
+  fra.me.REG[4] = CALL_syntax_base___Variable___name(fra.me.REG[1])(fra.me.REG[1]);
+  CALL_abstract_collection___Map_____braeq(fra.me.REG[5])(fra.me.REG[5], fra.me.REG[4], fra.me.REG[1]);
+  REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____all_variables(fra.me.REG[0])!=NIT_NULL);
+  /* ./syntax//control_flow.nit:44 */
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    fprintf(stderr, "Uninitialized attribute %s", "_all_variables");
+    fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 44);
+    nit_exit(1);
+  }
+  fra.me.REG[0] = ATTR_control_flow___VariableContext____all_variables(fra.me.REG[0]);
+  CALL_abstract_collection___SimpleCollection___add(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
+  stack_frame_head = fra.me.prev;
   return;
 }
-val_t control_flow___ControlFlowContext___prev(val_t  self) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 70, LOCATE_control_flow___ControlFlowContext___prev};
-  trace.prev = tracehead; tracehead = &trace;
-  tracehead = trace.prev;
-  return ATTR_control_flow___ControlFlowContext____prev( self) /*ControlFlowContext::_prev*/;
-}
-val_t control_flow___ControlFlowContext___has_return(val_t  self) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 73, LOCATE_control_flow___ControlFlowContext___has_return};
-  trace.prev = tracehead; tracehead = &trace;
-  tracehead = trace.prev;
-  return ATTR_control_flow___ControlFlowContext____has_return( self) /*ControlFlowContext::_has_return*/;
-}
-void control_flow___ControlFlowContext___has_return__eq(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 73, LOCATE_control_flow___ControlFlowContext___has_return__eq};
-  trace.prev = tracehead; tracehead = &trace;
-  ATTR_control_flow___ControlFlowContext____has_return( self) /*ControlFlowContext::_has_return*/ =  param0;
-  tracehead = trace.prev;
+void control_flow___VariableContext___mark_is_set(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 47;
+  fra.me.meth = LOCATE_control_flow___VariableContext___mark_is_set;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 2;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____set_variables(fra.me.REG[0])!=NIT_NULL);
+  /* ./syntax//control_flow.nit:49 */
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    fprintf(stderr, "Uninitialized attribute %s", "_set_variables");
+    fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 49);
+    nit_exit(1);
+  }
+  fra.me.REG[0] = ATTR_control_flow___VariableContext____set_variables(fra.me.REG[0]);
+  CALL_abstract_collection___SimpleCollection___add(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
+  stack_frame_head = fra.me.prev;
   return;
 }
-val_t control_flow___ControlFlowContext___unreash(val_t  self) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 76, LOCATE_control_flow___ControlFlowContext___unreash};
-  trace.prev = tracehead; tracehead = &trace;
-  tracehead = trace.prev;
-  return ATTR_control_flow___ControlFlowContext____unreash( self) /*ControlFlowContext::_unreash*/;
-}
-void control_flow___ControlFlowContext___unreash__eq(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 76, LOCATE_control_flow___ControlFlowContext___unreash__eq};
-  trace.prev = tracehead; tracehead = &trace;
-  ATTR_control_flow___ControlFlowContext____unreash( self) /*ControlFlowContext::_unreash*/ =  param0;
-  tracehead = trace.prev;
+void control_flow___VariableContext___check_is_set(val_t p0, val_t p1, val_t p2){
+  struct {struct stack_frame_t me; val_t MORE_REG[5];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t tmp;
+    static val_t once_value_1; /* Once value */
+    static val_t once_value_2; /* Once value */
+      static val_t once_value_3; /* Once value */
+      static val_t once_value_4; /* Once value */
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 52;
+  fra.me.meth = LOCATE_control_flow___VariableContext___check_is_set;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 6;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[3] = NIT_NULL;
+  fra.me.REG[4] = NIT_NULL;
+  fra.me.REG[5] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  fra.me.REG[2] = p2;
+  REGB0 = CALL_control_flow___Variable___must_be_set(fra.me.REG[2])(fra.me.REG[2]);
+  /* ./syntax//control_flow.nit:54 */
+  if (UNTAG_Bool(REGB0)) {
+    REGB0 = CALL_control_flow___VariableContext___is_set(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[2]);
+    REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
+  } else {
+    REGB1 = TAG_Bool(false);
+    REGB0 = REGB1;
+  }
+  if (UNTAG_Bool(REGB0)) {
+    REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____visitor(fra.me.REG[0])!=NIT_NULL);
+    /* ./syntax//control_flow.nit:55 */
+    if (UNTAG_Bool(REGB0)) {
+    } else {
+      fprintf(stderr, "Uninitialized attribute %s", "_visitor");
+      fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 55);
+      nit_exit(1);
+    }
+    fra.me.REG[3] = ATTR_control_flow___VariableContext____visitor(fra.me.REG[0]);
+    REGB0 = TAG_Int(3);
+    fra.me.REG[4] = NEW_Array_array___Array___with_capacity(REGB0);
+    if (!once_value_1) {
+      fra.me.REG[5] = BOX_NativeString("Error: variable '");
+      REGB0 = TAG_Int(17);
+      fra.me.REG[5] = NEW_String_string___String___with_native(fra.me.REG[5], REGB0);
+      once_value_1 = fra.me.REG[5];
+      register_static_object(&once_value_1);
+    } else fra.me.REG[5] = once_value_1;
+    array___Array___add(fra.me.REG[4], fra.me.REG[5]);
+    fra.me.REG[5] = CALL_string___Object___to_s(fra.me.REG[2])(fra.me.REG[2]);
+    array___Array___add(fra.me.REG[4], fra.me.REG[5]);
+    if (!once_value_2) {
+      fra.me.REG[5] = BOX_NativeString("' is possibly unset.");
+      REGB0 = TAG_Int(20);
+      fra.me.REG[5] = NEW_String_string___String___with_native(fra.me.REG[5], REGB0);
+      once_value_2 = fra.me.REG[5];
+      register_static_object(&once_value_2);
+    } else fra.me.REG[5] = once_value_2;
+    array___Array___add(fra.me.REG[4], fra.me.REG[5]);
+    fra.me.REG[4] = CALL_string___Object___to_s(fra.me.REG[4])(fra.me.REG[4]);
+    CALL_syntax_base___AbsSyntaxVisitor___error(fra.me.REG[3])(fra.me.REG[3], fra.me.REG[1], fra.me.REG[4]);
+  } else {
+    REGB0 = CALL_syntax_base___Variable___is_typed(fra.me.REG[2])(fra.me.REG[2]);
+    /* ./syntax//control_flow.nit:56 */
+    if (UNTAG_Bool(REGB0)) {
+      fra.me.REG[4] = CALL_control_flow___VariableContext___stype(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[2]);
+      REGB0 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
+      if (UNTAG_Bool(REGB0)) {
+      } else {
+        REGB1 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
+        if (UNTAG_Bool(REGB1)) {
+          REGB1 = TAG_Bool(false);
+          REGB0 = REGB1;
+        } else {
+          REGB1 = CALL_kernel___Object_____eqeq(fra.me.REG[4])(fra.me.REG[4], NIT_NULL);
+          REGB0 = REGB1;
+        }
+      }
+    } else {
+      REGB1 = TAG_Bool(false);
+      REGB0 = REGB1;
+    }
+    if (UNTAG_Bool(REGB0)) {
+      REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____visitor(fra.me.REG[0])!=NIT_NULL);
+      /* ./syntax//control_flow.nit:57 */
+      if (UNTAG_Bool(REGB0)) {
+      } else {
+        fprintf(stderr, "Uninitialized attribute %s", "_visitor");
+        fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 57);
+        nit_exit(1);
+      }
+      fra.me.REG[0] = ATTR_control_flow___VariableContext____visitor(fra.me.REG[0]);
+      REGB0 = TAG_Int(3);
+      fra.me.REG[4] = NEW_Array_array___Array___with_capacity(REGB0);
+      if (!once_value_3) {
+        fra.me.REG[3] = BOX_NativeString("Error: variable '");
+        REGB0 = TAG_Int(17);
+        fra.me.REG[3] = NEW_String_string___String___with_native(fra.me.REG[3], REGB0);
+        once_value_3 = fra.me.REG[3];
+        register_static_object(&once_value_3);
+      } else fra.me.REG[3] = once_value_3;
+      array___Array___add(fra.me.REG[4], fra.me.REG[3]);
+      fra.me.REG[2] = CALL_string___Object___to_s(fra.me.REG[2])(fra.me.REG[2]);
+      array___Array___add(fra.me.REG[4], fra.me.REG[2]);
+      if (!once_value_4) {
+        fra.me.REG[2] = BOX_NativeString("' is untyped.");
+        REGB0 = TAG_Int(13);
+        fra.me.REG[2] = NEW_String_string___String___with_native(fra.me.REG[2], REGB0);
+        once_value_4 = fra.me.REG[2];
+        register_static_object(&once_value_4);
+      } else fra.me.REG[2] = once_value_4;
+      array___Array___add(fra.me.REG[4], fra.me.REG[2]);
+      fra.me.REG[4] = CALL_string___Object___to_s(fra.me.REG[4])(fra.me.REG[4]);
+      CALL_syntax_base___AbsSyntaxVisitor___error(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1], fra.me.REG[4]);
+    }
+  }
+  stack_frame_head = fra.me.prev;
   return;
 }
-val_t control_flow___ControlFlowContext___already_unreash(val_t  self) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 79, LOCATE_control_flow___ControlFlowContext___already_unreash};
-  trace.prev = tracehead; tracehead = &trace;
-  tracehead = trace.prev;
-  return ATTR_control_flow___ControlFlowContext____already_unreash( self) /*ControlFlowContext::_already_unreash*/;
+val_t control_flow___VariableContext___stype(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[2];} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 61;
+  fra.me.meth = LOCATE_control_flow___VariableContext___stype;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 3;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____stypes(fra.me.REG[0])!=NIT_NULL);
+  /* ./syntax//control_flow.nit:65 */
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    fprintf(stderr, "Uninitialized attribute %s", "_stypes");
+    fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 65);
+    nit_exit(1);
+  }
+  fra.me.REG[2] = ATTR_control_flow___VariableContext____stypes(fra.me.REG[0]);
+  REGB0 = CALL_abstract_collection___MapRead___has_key(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[1]);
+  if (UNTAG_Bool(REGB0)) {
+    REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____stypes(fra.me.REG[0])!=NIT_NULL);
+    /* ./syntax//control_flow.nit:66 */
+    if (UNTAG_Bool(REGB0)) {
+    } else {
+      fprintf(stderr, "Uninitialized attribute %s", "_stypes");
+      fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 66);
+      nit_exit(1);
+    }
+    fra.me.REG[0] = ATTR_control_flow___VariableContext____stypes(fra.me.REG[0]);
+    fra.me.REG[0] = CALL_abstract_collection___MapRead_____bra(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
+    goto label1;
+  } else {
+    fra.me.REG[1] = CALL_syntax_base___Variable___stype(fra.me.REG[1])(fra.me.REG[1]);
+    fra.me.REG[0] = fra.me.REG[1];
+    /* ./syntax//control_flow.nit:68 */
+    goto label1;
+  }
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
 }
-void control_flow___ControlFlowContext___already_unreash__eq(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 79, LOCATE_control_flow___ControlFlowContext___already_unreash__eq};
-  trace.prev = tracehead; tracehead = &trace;
-  ATTR_control_flow___ControlFlowContext____already_unreash( self) /*ControlFlowContext::_already_unreash*/ =  param0;
-  tracehead = trace.prev;
+void control_flow___VariableContext___stype__eq(val_t p0, val_t p1, val_t p2){
+  struct {struct stack_frame_t me; val_t MORE_REG[2];} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 72;
+  fra.me.meth = LOCATE_control_flow___VariableContext___stype__eq;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 3;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  fra.me.REG[2] = p2;
+  REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____stypes(fra.me.REG[0])!=NIT_NULL);
+  /* ./syntax//control_flow.nit:76 */
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    fprintf(stderr, "Uninitialized attribute %s", "_stypes");
+    fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 76);
+    nit_exit(1);
+  }
+  fra.me.REG[0] = ATTR_control_flow___VariableContext____stypes(fra.me.REG[0]);
+  CALL_abstract_collection___Map_____braeq(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1], fra.me.REG[2]);
+  stack_frame_head = fra.me.prev;
   return;
 }
-val_t control_flow___ControlFlowContext___base_block(val_t  self) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 83, LOCATE_control_flow___ControlFlowContext___base_block};
-  trace.prev = tracehead; tracehead = &trace;
-  tracehead = trace.prev;
-  return ATTR_control_flow___ControlFlowContext____base_block( self) /*ControlFlowContext::_base_block*/;
-}
-void control_flow___ControlFlowContext___base_block__eq(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 83, LOCATE_control_flow___ControlFlowContext___base_block__eq};
-  trace.prev = tracehead; tracehead = &trace;
-  ATTR_control_flow___ControlFlowContext____base_block( self) /*ControlFlowContext::_base_block*/ =  param0;
-  tracehead = trace.prev;
-  return;
+val_t control_flow___VariableContext___sub(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 88;
+  fra.me.meth = LOCATE_control_flow___VariableContext___sub;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 2;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  fra.me.REG[1] = NEW_SubVariableContext_control_flow___SubVariableContext___with_prev(fra.me.REG[0], fra.me.REG[1]);
+  /* ./syntax//control_flow.nit:91 */
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[1];
 }
-val_t control_flow___ControlFlowContext___set_variables(val_t  self) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 86, LOCATE_control_flow___ControlFlowContext___set_variables};
-  trace.prev = tracehead; tracehead = &trace;
-  tracehead = trace.prev;
-  return ATTR_control_flow___ControlFlowContext____set_variables( self) /*ControlFlowContext::_set_variables*/;
+val_t control_flow___VariableContext___sub_with(val_t p0, val_t p1, val_t p2, val_t p3){
+  struct {struct stack_frame_t me; val_t MORE_REG[3];} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 94;
+  fra.me.meth = LOCATE_control_flow___VariableContext___sub_with;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 4;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[3] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  fra.me.REG[2] = p2;
+  fra.me.REG[3] = p3;
+  fra.me.REG[1] = CALL_control_flow___VariableContext___sub(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
+  /* ./syntax//control_flow.nit:98 */
+  CALL_control_flow___VariableContext___stype__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2], fra.me.REG[3]);
+  /* ./syntax//control_flow.nit:99 */
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[1];
 }
-val_t control_flow___ControlFlowContext___is_set(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 89, LOCATE_control_flow___ControlFlowContext___is_set};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-    val_t variable3;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 =  param0;
-  variable1 = ATTR_control_flow___ControlFlowContext____set_variables( self) /*ControlFlowContext::_set_variables*/;
-  variable1 = ((hash___HashSet___has_t)CALL(variable1,COLOR_abstract_collection___Collection___has))(variable1,  variable0 /*v*/) /*HashSet::has*/;
-  variable2 = variable1;
-  if (!UNTAG_Bool(variable2)) { /* or */
-    variable2 = ATTR_control_flow___ControlFlowContext____prev( self) /*ControlFlowContext::_prev*/;
-    variable2 = TAG_Bool(!UNTAG_Bool(TAG_Bool((variable2 ==  NIT_NULL /*null*/) || ((variable2 != NIT_NULL) && ((((kernel___Object_____eqeq_t)CALL(variable2,COLOR_kernel___Object_____eqeq))==kernel___Object_____eqeq)?(IS_EQUAL_NN(variable2, NIT_NULL /*null*/)):(UNTAG_Bool(((kernel___Object_____eqeq_t)CALL(variable2,COLOR_kernel___Object_____eqeq))(variable2,  NIT_NULL /*null*/) /*Object::==*/)))))));
-    variable3 = variable2;
-    if (UNTAG_Bool(variable3)) { /* and */
-      variable3 = ATTR_control_flow___ControlFlowContext____prev( self) /*ControlFlowContext::_prev*/;
-      variable3 = ((control_flow___ControlFlowContext___is_set_t)CALL(variable3,COLOR_control_flow___ControlFlowContext___is_set))(variable3,  variable0 /*v*/) /*ControlFlowContext::is_set*/;
-    }
-    variable2 = variable3;
+val_t control_flow___VariableContext___node(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 105;
+  fra.me.meth = LOCATE_control_flow___VariableContext___node;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____node(fra.me.REG[0])!=NIT_NULL);
+  /* ./syntax//control_flow.nit:105 */
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    fprintf(stderr, "Uninitialized attribute %s", "_node");
+    fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 105);
+    nit_exit(1);
   }
-  variable1 = variable2;
-  goto return_label6;
-  return_label6: while(false);
-  tracehead = trace.prev;
-  return variable1;
-}
-val_t control_flow___ControlFlowContext___sub(val_t  self) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 95, LOCATE_control_flow___ControlFlowContext___sub};
-  val_t variable0;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 = NEW_control_flow___ControlFlowContext___with( self); /*new ControlFlowContext*/
-  goto return_label7;
-  return_label7: while(false);
-  tracehead = trace.prev;
-  return variable0;
+  fra.me.REG[0] = ATTR_control_flow___VariableContext____node(fra.me.REG[0]);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
 }
-void control_flow___ControlFlowContext___init(val_t  self, int* init_table) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 100, LOCATE_control_flow___ControlFlowContext___init};
-  trace.prev = tracehead; tracehead = &trace;
-  if (init_table[VAL2OBJ( self)->vft[INIT_TABLE_POS_ControlFlowContext].i]) return;
-  init_table[VAL2OBJ( self)->vft[INIT_TABLE_POS_ControlFlowContext].i] = 1;
-  tracehead = trace.prev;
+void control_flow___VariableContext___init(val_t p0, val_t p1, val_t p2, int* init_table){
+  int itpos0 = VAL2OBJ(p0)->vft[INIT_TABLE_POS_VariableContext].i;
+  struct {struct stack_frame_t me; val_t MORE_REG[2];} fra;
+  val_t tmp;
+  if (init_table[itpos0]) return;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 108;
+  fra.me.meth = LOCATE_control_flow___VariableContext___init;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 3;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  fra.me.REG[2] = p2;
+  /* ./syntax//control_flow.nit:110 */
+  ATTR_control_flow___VariableContext____visitor(fra.me.REG[0]) = fra.me.REG[1];
+  /* ./syntax//control_flow.nit:111 */
+  ATTR_control_flow___VariableContext____node(fra.me.REG[0]) = fra.me.REG[2];
+  fra.me.REG[2] = NEW_HashMap_hash_collection___HashMap___init();
+  /* ./syntax//control_flow.nit:112 */
+  ATTR_control_flow___VariableContext____dico(fra.me.REG[0]) = fra.me.REG[2];
+  stack_frame_head = fra.me.prev;
+  init_table[itpos0] = 1;
   return;
 }
-void control_flow___ControlFlowContext___with(val_t  self, val_t  param0, int* init_table) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 104, LOCATE_control_flow___ControlFlowContext___with};
-  val_t variable0;
-  val_t variable1;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 =  param0;
-  if (init_table[VAL2OBJ( self)->vft[INIT_TABLE_POS_ControlFlowContext].i]) return;
-  ATTR_control_flow___ControlFlowContext____prev( self) /*ControlFlowContext::_prev*/ =  variable0 /*p*/;
-  variable1 = ((control_flow___ControlFlowContext___has_return_t)CALL( variable0 /*p*/,COLOR_control_flow___ControlFlowContext___has_return))( variable0 /*p*/) /*ControlFlowContext::has_return*/;
-  ATTR_control_flow___ControlFlowContext____has_return( self) /*ControlFlowContext::_has_return*/ = variable1;
-  variable1 = ((control_flow___ControlFlowContext___unreash_t)CALL( variable0 /*p*/,COLOR_control_flow___ControlFlowContext___unreash))( variable0 /*p*/) /*ControlFlowContext::unreash*/;
-  ATTR_control_flow___ControlFlowContext____unreash( self) /*ControlFlowContext::_unreash*/ = variable1;
-  variable1 = ((control_flow___ControlFlowContext___already_unreash_t)CALL( variable0 /*p*/,COLOR_control_flow___ControlFlowContext___already_unreash))( variable0 /*p*/) /*ControlFlowContext::already_unreash*/;
-  ATTR_control_flow___ControlFlowContext____already_unreash( self) /*ControlFlowContext::_already_unreash*/ = variable1;
-  variable1 = ((control_flow___ControlFlowContext___base_block_t)CALL( variable0 /*p*/,COLOR_control_flow___ControlFlowContext___base_block))( variable0 /*p*/) /*ControlFlowContext::base_block*/;
-  ATTR_control_flow___ControlFlowContext____base_block( self) /*ControlFlowContext::_base_block*/ = variable1;
-  init_table[VAL2OBJ( self)->vft[INIT_TABLE_POS_ControlFlowContext].i] = 1;
-  tracehead = trace.prev;
-  return;
+val_t control_flow___VariableContext___unreash(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 115;
+  fra.me.meth = LOCATE_control_flow___VariableContext___unreash;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____unreash(fra.me.REG[0])!=NIT_NULL);
+  /* ./syntax//control_flow.nit:115 */
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    fprintf(stderr, "Uninitialized attribute %s", "_unreash");
+    fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 115);
+    nit_exit(1);
+  }
+  REGB0 = ATTR_control_flow___VariableContext____unreash(fra.me.REG[0]);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
 }
-void control_flow___PNode___accept_control_flow(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 117, LOCATE_control_flow___PNode___accept_control_flow};
-  val_t variable0;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 =  param0;
-  ((syntax_base___PNode___accept_abs_syntax_visitor_t)CALL( self,COLOR_syntax_base___PNode___accept_abs_syntax_visitor))( self,  variable0 /*v*/) /*PNode::accept_abs_syntax_visitor*/;
-  tracehead = trace.prev;
+void control_flow___VariableContext___unreash__eq(val_t p0, val_t p1){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 115;
+  fra.me.meth = LOCATE_control_flow___VariableContext___unreash__eq;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  REGB0 = p1;
+  /* ./syntax//control_flow.nit:115 */
+  ATTR_control_flow___VariableContext____unreash(fra.me.REG[0]) = REGB0;
+  stack_frame_head = fra.me.prev;
   return;
 }
-void control_flow___AMethPropdef___accept_control_flow(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 124, LOCATE_control_flow___AMethPropdef___accept_control_flow};
-  val_t variable0;
-  val_t variable1;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 =  param0;
-  variable1 = NEW_control_flow___ControlFlowContext___init(); /*new ControlFlowContext*/
-  ((control_flow___ControlFlowVisitor___control_flow_ctx__eq_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx__eq))( variable0 /*v*/, variable1) /*ControlFlowVisitor::control_flow_ctx=*/;
-  ((control_flow___AMethPropdef___accept_control_flow_t)CALL( self,COLOR_SUPER_control_flow___AMethPropdef___accept_control_flow))( self,  param0) /*super AMethPropdef::accept_control_flow*/;
-  tracehead = trace.prev;
-  return;
+val_t control_flow___VariableContext___already_unreash(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 118;
+  fra.me.meth = LOCATE_control_flow___VariableContext___already_unreash;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____already_unreash(fra.me.REG[0])!=NIT_NULL);
+  /* ./syntax//control_flow.nit:118 */
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    fprintf(stderr, "Uninitialized attribute %s", "_already_unreash");
+    fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 118);
+    nit_exit(1);
+  }
+  REGB0 = ATTR_control_flow___VariableContext____already_unreash(fra.me.REG[0]);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
 }
-void control_flow___AConcreteMethPropdef___accept_control_flow(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 132, LOCATE_control_flow___AConcreteMethPropdef___accept_control_flow};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 =  param0;
-  ((control_flow___AConcreteMethPropdef___accept_control_flow_t)CALL( self,COLOR_SUPER_control_flow___AConcreteMethPropdef___accept_control_flow))( self,  param0) /*super AConcreteMethPropdef::accept_control_flow*/;
-  variable1 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( variable0 /*v*/) /*ControlFlowVisitor::control_flow_ctx*/;
-  variable1 = ((control_flow___ControlFlowContext___has_return_t)CALL(variable1,COLOR_control_flow___ControlFlowContext___has_return))(variable1) /*ControlFlowContext::has_return*/;
-  variable1 = TAG_Bool((variable1)==( TAG_Bool(false)));
-  variable2 = variable1;
-  if (UNTAG_Bool(variable2)) { /* and */
-    variable2 = ((syntax_base___AMethPropdef___method_t)CALL( self,COLOR_syntax_base___AMethPropdef___method))( self) /*AMethPropdef::method*/;
-    variable2 = ((static_type___MMLocalProperty___signature_t)CALL(variable2,COLOR_static_type___MMLocalProperty___signature))(variable2) /*MMLocalProperty::signature*/;
-    variable2 = ((static_type___MMSignature___return_type_t)CALL(variable2,COLOR_static_type___MMSignature___return_type))(variable2) /*MMSignature::return_type*/;
-    variable2 = TAG_Bool(!UNTAG_Bool(TAG_Bool((variable2 ==  NIT_NULL /*null*/) || ((variable2 != NIT_NULL) && ((((kernel___Object_____eqeq_t)CALL(variable2,COLOR_kernel___Object_____eqeq))==kernel___Object_____eqeq)?(IS_EQUAL_NN(variable2, NIT_NULL /*null*/)):(UNTAG_Bool(((kernel___Object_____eqeq_t)CALL(variable2,COLOR_kernel___Object_____eqeq))(variable2,  NIT_NULL /*null*/) /*Object::==*/)))))));
-  }
-  variable1 = variable2;
-  if (UNTAG_Bool(variable1)) { /*if*/
-    variable1 = NEW_string___String___with_native(BOX_NativeString("Control error: Reached end of function."), TAG_Int(39)); /*new String*/
-    ((syntax_base___AbsSyntaxVisitor___error_t)CALL( variable0 /*v*/,COLOR_syntax_base___AbsSyntaxVisitor___error))( variable0 /*v*/,  self, variable1) /*AbsSyntaxVisitor::error*/;
-  }
-  tracehead = trace.prev;
+void control_flow___VariableContext___already_unreash__eq(val_t p0, val_t p1){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 118;
+  fra.me.meth = LOCATE_control_flow___VariableContext___already_unreash__eq;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  REGB0 = p1;
+  /* ./syntax//control_flow.nit:118 */
+  ATTR_control_flow___VariableContext____already_unreash(fra.me.REG[0]) = REGB0;
+  stack_frame_head = fra.me.prev;
   return;
 }
-void control_flow___PParam___accept_control_flow(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 142, LOCATE_control_flow___PParam___accept_control_flow};
-  val_t variable0;
-  val_t variable1;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 =  param0;
-  ((control_flow___PParam___accept_control_flow_t)CALL( self,COLOR_SUPER_control_flow___PParam___accept_control_flow))( self,  param0) /*super PParam::accept_control_flow*/;
-  variable1 = ((syntax_base___PParam___variable_t)CALL( self,COLOR_syntax_base___PParam___variable))( self) /*PParam::variable*/;
-  ((control_flow___ControlFlowVisitor___mark_is_set_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___mark_is_set))( variable0 /*v*/, variable1) /*ControlFlowVisitor::mark_is_set*/;
-  tracehead = trace.prev;
-  return;
+val_t control_flow___VariableContext___set_variables(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 122;
+  fra.me.meth = LOCATE_control_flow___VariableContext___set_variables;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____set_variables(fra.me.REG[0])!=NIT_NULL);
+  /* ./syntax//control_flow.nit:122 */
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    fprintf(stderr, "Uninitialized attribute %s", "_set_variables");
+    fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 122);
+    nit_exit(1);
+  }
+  fra.me.REG[0] = ATTR_control_flow___VariableContext____set_variables(fra.me.REG[0]);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
 }
-void control_flow___AVardeclExpr___accept_control_flow(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 150, LOCATE_control_flow___AVardeclExpr___accept_control_flow};
-  val_t variable0;
-  val_t variable1;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 =  param0;
-  ((control_flow___AVardeclExpr___accept_control_flow_t)CALL( self,COLOR_SUPER_control_flow___AVardeclExpr___accept_control_flow))( self,  param0) /*super AVardeclExpr::accept_control_flow*/;
-  variable1 = ((parser_nodes___AVardeclExpr___n_expr_t)CALL( self,COLOR_parser_nodes___AVardeclExpr___n_expr))( self) /*AVardeclExpr::n_expr*/;
-  variable1 = TAG_Bool(!UNTAG_Bool(TAG_Bool((variable1 ==  NIT_NULL /*null*/) || ((variable1 != NIT_NULL) && ((((kernel___Object_____eqeq_t)CALL(variable1,COLOR_kernel___Object_____eqeq))==kernel___Object_____eqeq)?(IS_EQUAL_NN(variable1, NIT_NULL /*null*/)):(UNTAG_Bool(((kernel___Object_____eqeq_t)CALL(variable1,COLOR_kernel___Object_____eqeq))(variable1,  NIT_NULL /*null*/) /*Object::==*/)))))));
-  if (UNTAG_Bool(variable1)) { /*if*/
-    variable1 = ((syntax_base___AVardeclExpr___variable_t)CALL( self,COLOR_syntax_base___AVardeclExpr___variable))( self) /*AVardeclExpr::variable*/;
-    ((control_flow___ControlFlowVisitor___mark_is_set_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___mark_is_set))( variable0 /*v*/, variable1) /*ControlFlowVisitor::mark_is_set*/;
-  }
-  tracehead = trace.prev;
-  return;
+val_t control_flow___VariableContext___is_set(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 125;
+  fra.me.meth = LOCATE_control_flow___VariableContext___is_set;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 2;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____set_variables(fra.me.REG[0])!=NIT_NULL);
+  /* ./syntax//control_flow.nit:128 */
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    fprintf(stderr, "Uninitialized attribute %s", "_set_variables");
+    fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 128);
+    nit_exit(1);
+  }
+  fra.me.REG[0] = ATTR_control_flow___VariableContext____set_variables(fra.me.REG[0]);
+  REGB0 = CALL_abstract_collection___Collection___has(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
 }
-void control_flow___ABlockExpr___accept_control_flow(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 158, LOCATE_control_flow___ABlockExpr___accept_control_flow};
-  val_t variable0;
-  val_t variable1;
-    val_t variable2;
-    val_t variable3;
-    val_t variable4;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 =  param0;
-  variable1 = ((parser_nodes___ABlockExpr___n_expr_t)CALL( self,COLOR_parser_nodes___ABlockExpr___n_expr))( self) /*ABlockExpr::n_expr*/;
-  variable1 = ((list___List___iterator_t)CALL(variable1,COLOR_abstract_collection___Collection___iterator))(variable1) /*List::iterator*/;
-  while (true) { /*for*/
-    variable2 = ((list___ListIterator___is_ok_t)CALL(variable1,COLOR_abstract_collection___Iterator___is_ok))(variable1) /*ListIterator::is_ok*/;
-    if (!UNTAG_Bool(variable2)) break; /*for*/
-    variable2 = ((list___ListIterator___item_t)CALL(variable1,COLOR_abstract_collection___Iterator___item))(variable1) /*ListIterator::item*/;
-    variable3 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( variable0 /*v*/) /*ControlFlowVisitor::control_flow_ctx*/;
-    variable3 = ((control_flow___ControlFlowContext___unreash_t)CALL(variable3,COLOR_control_flow___ControlFlowContext___unreash))(variable3) /*ControlFlowContext::unreash*/;
-    variable4 = variable3;
-    if (UNTAG_Bool(variable4)) { /* and */
-      variable4 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( variable0 /*v*/) /*ControlFlowVisitor::control_flow_ctx*/;
-      variable4 = ((control_flow___ControlFlowContext___already_unreash_t)CALL(variable4,COLOR_control_flow___ControlFlowContext___already_unreash))(variable4) /*ControlFlowContext::already_unreash*/;
-      variable4 =  TAG_Bool(!UNTAG_Bool(variable4));
+void control_flow___VariableContext___merge(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[5];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 131;
+  fra.me.meth = LOCATE_control_flow___VariableContext___merge;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 6;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[3] = NIT_NULL;
+  fra.me.REG[4] = NIT_NULL;
+  fra.me.REG[5] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  REGB0 = CALL_control_flow___VariableContext___unreash(fra.me.REG[1])(fra.me.REG[1]);
+  /* ./syntax//control_flow.nit:134 */
+  if (UNTAG_Bool(REGB0)) {
+    REGB0 = TAG_Bool(true);
+    /* ./syntax//control_flow.nit:135 */
+    CALL_control_flow___VariableContext___unreash__eq(fra.me.REG[0])(fra.me.REG[0], REGB0);
+    REGB0 = CALL_control_flow___VariableContext___already_unreash(fra.me.REG[1])(fra.me.REG[1]);
+    /* ./syntax//control_flow.nit:136 */
+    if (UNTAG_Bool(REGB0)) {
+      REGB0 = TAG_Bool(true);
+      CALL_control_flow___VariableContext___already_unreash__eq(fra.me.REG[0])(fra.me.REG[0], REGB0);
     }
-    variable3 = variable4;
-    if (UNTAG_Bool(variable3)) { /*if*/
-      variable3 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( variable0 /*v*/) /*ControlFlowVisitor::control_flow_ctx*/;
-      ((control_flow___ControlFlowContext___already_unreash__eq_t)CALL(variable3,COLOR_control_flow___ControlFlowContext___already_unreash__eq))(variable3,  TAG_Bool(true)) /*ControlFlowContext::already_unreash=*/;
-      variable3 = NEW_string___String___with_native(BOX_NativeString("Warning: unreachable statement."), TAG_Int(31)); /*new String*/
-      ((syntax_base___AbsSyntaxVisitor___warning_t)CALL( variable0 /*v*/,COLOR_syntax_base___AbsSyntaxVisitor___warning))( variable0 /*v*/,  variable2 /*e*/, variable3) /*AbsSyntaxVisitor::warning*/;
+    /* ./syntax//control_flow.nit:137 */
+    goto label1;
+  }
+  REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____all_variables(fra.me.REG[0])!=NIT_NULL);
+  /* ./syntax//control_flow.nit:139 */
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    fprintf(stderr, "Uninitialized attribute %s", "_all_variables");
+    fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 139);
+    nit_exit(1);
+  }
+  fra.me.REG[2] = ATTR_control_flow___VariableContext____all_variables(fra.me.REG[0]);
+  fra.me.REG[2] = CALL_abstract_collection___Collection___iterator(fra.me.REG[2])(fra.me.REG[2]);
+  while(1) {
+    REGB0 = CALL_abstract_collection___Iterator___is_ok(fra.me.REG[2])(fra.me.REG[2]);
+    if (UNTAG_Bool(REGB0)) {
+      fra.me.REG[3] = CALL_abstract_collection___Iterator___item(fra.me.REG[2])(fra.me.REG[2]);
+      REGB0 = CALL_control_flow___VariableContext___is_set(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[3]);
+      REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
+      /* ./syntax//control_flow.nit:140 */
+      if (UNTAG_Bool(REGB0)) {
+        REGB0 = CALL_control_flow___VariableContext___is_set(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
+      } else {
+        REGB1 = TAG_Bool(false);
+        REGB0 = REGB1;
+      }
+      if (UNTAG_Bool(REGB0)) {
+        /* ./syntax//control_flow.nit:141 */
+        CALL_control_flow___VariableContext___mark_is_set(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[3]);
+      }
+      fra.me.REG[4] = CALL_control_flow___VariableContext___stype(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[3]);
+      fra.me.REG[5] = CALL_control_flow___VariableContext___stype(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
+      REGB0 = TAG_Bool(IS_EQUAL_NN(fra.me.REG[5],fra.me.REG[4]));
+      /* ./syntax//control_flow.nit:145 */
+      if (UNTAG_Bool(REGB0)) {
+      } else {
+        REGB1 = TAG_Bool(fra.me.REG[5]==NIT_NULL);
+        if (UNTAG_Bool(REGB1)) {
+          REGB1 = TAG_Bool(false);
+          REGB0 = REGB1;
+        } else {
+          REGB1 = CALL_kernel___Object_____eqeq(fra.me.REG[5])(fra.me.REG[5], fra.me.REG[4]);
+          REGB0 = REGB1;
+        }
+      }
+      REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
+      if (UNTAG_Bool(REGB0)) {
+        CALL_control_flow___VariableContext___stype__eq(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[3], fra.me.REG[5]);
+      }
+    } else {
+      /* ./syntax//control_flow.nit:139 */
+      goto label2;
     }
-    ((control_flow___ControlFlowVisitor___visit_t)CALL( variable0 /*v*/,COLOR_parser_prod___Visitor___visit))( variable0 /*v*/,  variable2 /*e*/) /*ControlFlowVisitor::visit*/;
-    continue_16: while(0);
-    ((list___ListIterator___next_t)CALL(variable1,COLOR_abstract_collection___Iterator___next))(variable1) /*ListIterator::next*/;
+    CALL_abstract_collection___Iterator___next(fra.me.REG[2])(fra.me.REG[2]);
   }
-  break_16: while(0);
-  tracehead = trace.prev;
-  return;
-}
-void control_flow___AReturnExpr___accept_control_flow(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 171, LOCATE_control_flow___AReturnExpr___accept_control_flow};
-  val_t variable0;
-  val_t variable1;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 =  param0;
-  ((control_flow___AReturnExpr___accept_control_flow_t)CALL( self,COLOR_SUPER_control_flow___AReturnExpr___accept_control_flow))( self,  param0) /*super AReturnExpr::accept_control_flow*/;
-  variable1 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( variable0 /*v*/) /*ControlFlowVisitor::control_flow_ctx*/;
-  ((control_flow___ControlFlowContext___has_return__eq_t)CALL(variable1,COLOR_control_flow___ControlFlowContext___has_return__eq))(variable1,  TAG_Bool(true)) /*ControlFlowContext::has_return=*/;
-  variable1 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( variable0 /*v*/) /*ControlFlowVisitor::control_flow_ctx*/;
-  ((control_flow___ControlFlowContext___unreash__eq_t)CALL(variable1,COLOR_control_flow___ControlFlowContext___unreash__eq))(variable1,  TAG_Bool(true)) /*ControlFlowContext::unreash=*/;
-  tracehead = trace.prev;
-  return;
-}
-val_t control_flow___ABlockControler___block(val_t  self) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 181, LOCATE_control_flow___ABlockControler___block};
-  trace.prev = tracehead; tracehead = &trace;
-  tracehead = trace.prev;
-  return ATTR_control_flow___ABlockControler____block( self) /*ABlockControler::_block*/;
-}
-void control_flow___ABreakExpr___accept_control_flow(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 186, LOCATE_control_flow___ABreakExpr___accept_control_flow};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 =  param0;
-  ((control_flow___ABreakExpr___accept_control_flow_t)CALL( self,COLOR_SUPER_control_flow___ABreakExpr___accept_control_flow))( self,  param0) /*super ABreakExpr::accept_control_flow*/;
-  variable2 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( variable0 /*v*/) /*ControlFlowVisitor::control_flow_ctx*/;
-  variable2 = ((control_flow___ControlFlowContext___base_block_t)CALL(variable2,COLOR_control_flow___ControlFlowContext___base_block))(variable2) /*ControlFlowContext::base_block*/;
-  variable1 = variable2;
-  variable2 = TAG_Bool(( variable1 /*block*/ ==  NIT_NULL /*null*/) || (( variable1 /*block*/ != NIT_NULL) && ((((kernel___Object_____eqeq_t)CALL( variable1 /*block*/,COLOR_kernel___Object_____eqeq))==kernel___Object_____eqeq)?(IS_EQUAL_NN( variable1 /*block*/, NIT_NULL /*null*/)):(UNTAG_Bool(((kernel___Object_____eqeq_t)CALL( variable1 /*block*/,COLOR_kernel___Object_____eqeq))( variable1 /*block*/,  NIT_NULL /*null*/) /*Object::==*/)))));
-  if (UNTAG_Bool(variable2)) { /*if*/
-    variable2 = NEW_string___String___with_native(BOX_NativeString("Syntax Error: 'break' statment outside block."), TAG_Int(45)); /*new String*/
-    ((syntax_base___AbsSyntaxVisitor___error_t)CALL( variable0 /*v*/,COLOR_syntax_base___AbsSyntaxVisitor___error))( variable0 /*v*/,  self, variable2) /*AbsSyntaxVisitor::error*/;
-    goto return_label18;
-  }
-  ATTR_control_flow___ABlockControler____block( self) /*ABlockControler::_block*/ =  variable1 /*block*/;
-  variable2 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( variable0 /*v*/) /*ControlFlowVisitor::control_flow_ctx*/;
-  ((control_flow___ControlFlowContext___unreash__eq_t)CALL(variable2,COLOR_control_flow___ControlFlowContext___unreash__eq))(variable2,  TAG_Bool(true)) /*ControlFlowContext::unreash=*/;
-  return_label18: while(false);
-  tracehead = trace.prev;
-  return;
-}
-void control_flow___AContinueExpr___accept_control_flow(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 200, LOCATE_control_flow___AContinueExpr___accept_control_flow};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 =  param0;
-  ((control_flow___AContinueExpr___accept_control_flow_t)CALL( self,COLOR_SUPER_control_flow___AContinueExpr___accept_control_flow))( self,  param0) /*super AContinueExpr::accept_control_flow*/;
-  variable2 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( variable0 /*v*/) /*ControlFlowVisitor::control_flow_ctx*/;
-  variable2 = ((control_flow___ControlFlowContext___base_block_t)CALL(variable2,COLOR_control_flow___ControlFlowContext___base_block))(variable2) /*ControlFlowContext::base_block*/;
-  variable1 = variable2;
-  variable2 = TAG_Bool(( variable1 /*block*/ ==  NIT_NULL /*null*/) || (( variable1 /*block*/ != NIT_NULL) && ((((kernel___Object_____eqeq_t)CALL( variable1 /*block*/,COLOR_kernel___Object_____eqeq))==kernel___Object_____eqeq)?(IS_EQUAL_NN( variable1 /*block*/, NIT_NULL /*null*/)):(UNTAG_Bool(((kernel___Object_____eqeq_t)CALL( variable1 /*block*/,COLOR_kernel___Object_____eqeq))( variable1 /*block*/,  NIT_NULL /*null*/) /*Object::==*/)))));
-  if (UNTAG_Bool(variable2)) { /*if*/
-    variable2 = NEW_string___String___with_native(BOX_NativeString("Syntax Error: 'continue' outside block."), TAG_Int(39)); /*new String*/
-    ((syntax_base___AbsSyntaxVisitor___error_t)CALL( variable0 /*v*/,COLOR_syntax_base___AbsSyntaxVisitor___error))( variable0 /*v*/,  self, variable2) /*AbsSyntaxVisitor::error*/;
-    goto return_label19;
-  }
-  ATTR_control_flow___ABlockControler____block( self) /*ABlockControler::_block*/ =  variable1 /*block*/;
-  variable2 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( variable0 /*v*/) /*ControlFlowVisitor::control_flow_ctx*/;
-  ((control_flow___ControlFlowContext___unreash__eq_t)CALL(variable2,COLOR_control_flow___ControlFlowContext___unreash__eq))(variable2,  TAG_Bool(true)) /*ControlFlowContext::unreash=*/;
-  return_label19: while(false);
-  tracehead = trace.prev;
+  label2: while(0);
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
   return;
 }
-void control_flow___AAbortExpr___accept_control_flow(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 214, LOCATE_control_flow___AAbortExpr___accept_control_flow};
-  val_t variable0;
-  val_t variable1;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 =  param0;
-  ((control_flow___AAbortExpr___accept_control_flow_t)CALL( self,COLOR_SUPER_control_flow___AAbortExpr___accept_control_flow))( self,  param0) /*super AAbortExpr::accept_control_flow*/;
-  variable1 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( variable0 /*v*/) /*ControlFlowVisitor::control_flow_ctx*/;
-  ((control_flow___ControlFlowContext___has_return__eq_t)CALL(variable1,COLOR_control_flow___ControlFlowContext___has_return__eq))(variable1,  TAG_Bool(true)) /*ControlFlowContext::has_return=*/;
-  variable1 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( variable0 /*v*/) /*ControlFlowVisitor::control_flow_ctx*/;
-  ((control_flow___ControlFlowContext___unreash__eq_t)CALL(variable1,COLOR_control_flow___ControlFlowContext___unreash__eq))(variable1,  TAG_Bool(true)) /*ControlFlowContext::unreash=*/;
-  tracehead = trace.prev;
-  return;
-}
-void control_flow___AIfExpr___accept_control_flow(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 223, LOCATE_control_flow___AIfExpr___accept_control_flow};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-    val_t variable3;
-    val_t variable4;
-      val_t variable5;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 =  param0;
-  variable1 = ((parser_nodes___AIfExpr___n_expr_t)CALL( self,COLOR_parser_nodes___AIfExpr___n_expr))( self) /*AIfExpr::n_expr*/;
-  ((control_flow___ControlFlowVisitor___visit_t)CALL( variable0 /*v*/,COLOR_parser_prod___Visitor___visit))( variable0 /*v*/, variable1) /*ControlFlowVisitor::visit*/;
-  variable2 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( variable0 /*v*/) /*ControlFlowVisitor::control_flow_ctx*/;
-  variable1 = variable2;
-  variable2 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( variable0 /*v*/) /*ControlFlowVisitor::control_flow_ctx*/;
-  variable2 = ((control_flow___ControlFlowContext___sub_t)CALL(variable2,COLOR_control_flow___ControlFlowContext___sub))(variable2) /*ControlFlowContext::sub*/;
-  ((control_flow___ControlFlowVisitor___control_flow_ctx__eq_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx__eq))( variable0 /*v*/, variable2) /*ControlFlowVisitor::control_flow_ctx=*/;
-  variable2 = ((parser_nodes___AIfExpr___n_then_t)CALL( self,COLOR_parser_nodes___AIfExpr___n_then))( self) /*AIfExpr::n_then*/;
-  ((control_flow___ControlFlowVisitor___visit_t)CALL( variable0 /*v*/,COLOR_parser_prod___Visitor___visit))( variable0 /*v*/, variable2) /*ControlFlowVisitor::visit*/;
-  variable2 = ((parser_nodes___AIfExpr___n_else_t)CALL( self,COLOR_parser_nodes___AIfExpr___n_else))( self) /*AIfExpr::n_else*/;
-  variable2 = TAG_Bool((variable2 ==  NIT_NULL /*null*/) || ((variable2 != NIT_NULL) && ((((kernel___Object_____eqeq_t)CALL(variable2,COLOR_kernel___Object_____eqeq))==kernel___Object_____eqeq)?(IS_EQUAL_NN(variable2, NIT_NULL /*null*/)):(UNTAG_Bool(((kernel___Object_____eqeq_t)CALL(variable2,COLOR_kernel___Object_____eqeq))(variable2,  NIT_NULL /*null*/) /*Object::==*/)))));
-  if (UNTAG_Bool(variable2)) { /*if*/
-    ((control_flow___ControlFlowVisitor___control_flow_ctx__eq_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx__eq))( variable0 /*v*/,  variable1 /*old_control_flow_ctx*/) /*ControlFlowVisitor::control_flow_ctx=*/;
-  } else { /*if*/
-    variable3 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( variable0 /*v*/) /*ControlFlowVisitor::control_flow_ctx*/;
-    variable2 = variable3;
-    variable3 = ((control_flow___ControlFlowContext___sub_t)CALL( variable1 /*old_control_flow_ctx*/,COLOR_control_flow___ControlFlowContext___sub))( variable1 /*old_control_flow_ctx*/) /*ControlFlowContext::sub*/;
-    ((control_flow___ControlFlowVisitor___control_flow_ctx__eq_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx__eq))( variable0 /*v*/, variable3) /*ControlFlowVisitor::control_flow_ctx=*/;
-    variable3 = ((parser_nodes___AIfExpr___n_else_t)CALL( self,COLOR_parser_nodes___AIfExpr___n_else))( self) /*AIfExpr::n_else*/;
-    ((control_flow___ControlFlowVisitor___visit_t)CALL( variable0 /*v*/,COLOR_parser_prod___Visitor___visit))( variable0 /*v*/, variable3) /*ControlFlowVisitor::visit*/;
-    variable3 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( variable0 /*v*/) /*ControlFlowVisitor::control_flow_ctx*/;
-    variable3 = ((control_flow___ControlFlowContext___has_return_t)CALL(variable3,COLOR_control_flow___ControlFlowContext___has_return))(variable3) /*ControlFlowContext::has_return*/;
-    variable4 = variable3;
-    if (UNTAG_Bool(variable4)) { /* and */
-      variable4 = ((control_flow___ControlFlowContext___has_return_t)CALL( variable2 /*then_control_flow_ctx*/,COLOR_control_flow___ControlFlowContext___has_return))( variable2 /*then_control_flow_ctx*/) /*ControlFlowContext::has_return*/;
-    }
-    variable3 = variable4;
-    ((control_flow___ControlFlowContext___has_return__eq_t)CALL( variable1 /*old_control_flow_ctx*/,COLOR_control_flow___ControlFlowContext___has_return__eq))( variable1 /*old_control_flow_ctx*/, variable3) /*ControlFlowContext::has_return=*/;
-    variable3 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( variable0 /*v*/) /*ControlFlowVisitor::control_flow_ctx*/;
-    variable3 = ((control_flow___ControlFlowContext___unreash_t)CALL(variable3,COLOR_control_flow___ControlFlowContext___unreash))(variable3) /*ControlFlowContext::unreash*/;
-    variable4 = variable3;
-    if (UNTAG_Bool(variable4)) { /* and */
-      variable4 = ((control_flow___ControlFlowContext___unreash_t)CALL( variable2 /*then_control_flow_ctx*/,COLOR_control_flow___ControlFlowContext___unreash))( variable2 /*then_control_flow_ctx*/) /*ControlFlowContext::unreash*/;
+void control_flow___VariableContext___merge2(val_t p0, val_t p1, val_t p2, val_t p3){
+  struct {struct stack_frame_t me; val_t MORE_REG[8];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 149;
+  fra.me.meth = LOCATE_control_flow___VariableContext___merge2;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 9;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[3] = NIT_NULL;
+  fra.me.REG[4] = NIT_NULL;
+  fra.me.REG[5] = NIT_NULL;
+  fra.me.REG[6] = NIT_NULL;
+  fra.me.REG[7] = NIT_NULL;
+  fra.me.REG[8] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  fra.me.REG[2] = p2;
+  fra.me.REG[3] = p3;
+  REGB0 = CALL_control_flow___VariableContext___unreash(fra.me.REG[1])(fra.me.REG[1]);
+  /* ./syntax//control_flow.nit:152 */
+  if (UNTAG_Bool(REGB0)) {
+    /* ./syntax//control_flow.nit:153 */
+    CALL_control_flow___VariableContext___merge(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[2]);
+  } else {
+    REGB0 = CALL_control_flow___VariableContext___unreash(fra.me.REG[2])(fra.me.REG[2]);
+    /* ./syntax//control_flow.nit:154 */
+    if (UNTAG_Bool(REGB0)) {
+      /* ./syntax//control_flow.nit:155 */
+      CALL_control_flow___VariableContext___merge(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
     }
-    variable3 = variable4;
-    ((control_flow___ControlFlowContext___unreash__eq_t)CALL( variable1 /*old_control_flow_ctx*/,COLOR_control_flow___ControlFlowContext___unreash__eq))( variable1 /*old_control_flow_ctx*/, variable3) /*ControlFlowContext::unreash=*/;
-    variable3 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( variable0 /*v*/) /*ControlFlowVisitor::control_flow_ctx*/;
-    variable3 = ((control_flow___ControlFlowContext___unreash_t)CALL(variable3,COLOR_control_flow___ControlFlowContext___unreash))(variable3) /*ControlFlowContext::unreash*/;
-    if (UNTAG_Bool(variable3)) { /*if*/
-      ((control_flow___ControlFlowVisitor___control_flow_ctx__eq_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx__eq))( variable0 /*v*/,  variable2 /*then_control_flow_ctx*/) /*ControlFlowVisitor::control_flow_ctx=*/;
-    }
-    variable3 = ((control_flow___ControlFlowContext___unreash_t)CALL( variable2 /*then_control_flow_ctx*/,COLOR_control_flow___ControlFlowContext___unreash))( variable2 /*then_control_flow_ctx*/) /*ControlFlowContext::unreash*/;
-    if (UNTAG_Bool(variable3)) { /*if*/
-      variable3 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( variable0 /*v*/) /*ControlFlowVisitor::control_flow_ctx*/;
-      variable2 = variable3 /*then_control_flow_ctx=*/;
-    }
-    variable3 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( variable0 /*v*/) /*ControlFlowVisitor::control_flow_ctx*/;
-    variable3 = ((control_flow___ControlFlowContext___set_variables_t)CALL(variable3,COLOR_control_flow___ControlFlowContext___set_variables))(variable3) /*ControlFlowContext::set_variables*/;
-    variable3 = ((hash___HashSet___iterator_t)CALL(variable3,COLOR_abstract_collection___Collection___iterator))(variable3) /*HashSet::iterator*/;
-    while (true) { /*for*/
-      variable4 = ((abstract_collection___Iterator___is_ok_t)CALL(variable3,COLOR_abstract_collection___Iterator___is_ok))(variable3) /*Iterator::is_ok*/;
-      if (!UNTAG_Bool(variable4)) break; /*for*/
-      variable4 = ((abstract_collection___Iterator___item_t)CALL(variable3,COLOR_abstract_collection___Iterator___item))(variable3) /*Iterator::item*/;
-      variable5 = ((control_flow___ControlFlowContext___is_set_t)CALL( variable2 /*then_control_flow_ctx*/,COLOR_control_flow___ControlFlowContext___is_set))( variable2 /*then_control_flow_ctx*/,  variable4 /*variable*/) /*ControlFlowContext::is_set*/;
-      if (UNTAG_Bool(variable5)) { /*if*/
-        variable5 = ((control_flow___ControlFlowContext___set_variables_t)CALL( variable1 /*old_control_flow_ctx*/,COLOR_control_flow___ControlFlowContext___set_variables))( variable1 /*old_control_flow_ctx*/) /*ControlFlowContext::set_variables*/;
-        ((hash___HashSet___add_t)CALL(variable5,COLOR_abstract_collection___SimpleCollection___add))(variable5,  variable4 /*variable*/) /*HashSet::add*/;
+  }
+  REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____all_variables(fra.me.REG[0])!=NIT_NULL);
+  /* ./syntax//control_flow.nit:157 */
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    fprintf(stderr, "Uninitialized attribute %s", "_all_variables");
+    fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 157);
+    nit_exit(1);
+  }
+  fra.me.REG[4] = ATTR_control_flow___VariableContext____all_variables(fra.me.REG[0]);
+  fra.me.REG[4] = CALL_abstract_collection___Collection___iterator(fra.me.REG[4])(fra.me.REG[4]);
+  while(1) {
+    REGB0 = CALL_abstract_collection___Iterator___is_ok(fra.me.REG[4])(fra.me.REG[4]);
+    if (UNTAG_Bool(REGB0)) {
+      fra.me.REG[5] = CALL_abstract_collection___Iterator___item(fra.me.REG[4])(fra.me.REG[4]);
+      REGB0 = CALL_control_flow___VariableContext___is_set(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[5]);
+      REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
+      /* ./syntax//control_flow.nit:158 */
+      if (UNTAG_Bool(REGB0)) {
+        REGB0 = CALL_control_flow___VariableContext___is_set(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[5]);
+      } else {
+        REGB1 = TAG_Bool(false);
+        REGB0 = REGB1;
+      }
+      if (UNTAG_Bool(REGB0)) {
+        REGB0 = CALL_control_flow___VariableContext___is_set(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[5]);
+      } else {
+        REGB1 = TAG_Bool(false);
+        REGB0 = REGB1;
+      }
+      if (UNTAG_Bool(REGB0)) {
+        /* ./syntax//control_flow.nit:159 */
+        CALL_control_flow___VariableContext___mark_is_set(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[5]);
+      }
+      fra.me.REG[6] = CALL_control_flow___VariableContext___stype(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[5]);
+      fra.me.REG[7] = CALL_control_flow___VariableContext___stype(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[5]);
+      fra.me.REG[8] = CALL_control_flow___VariableContext___stype(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[5]);
+      REGB0 = TAG_Bool(IS_EQUAL_NN(fra.me.REG[7],fra.me.REG[6]));
+      /* ./syntax//control_flow.nit:165 */
+      if (UNTAG_Bool(REGB0)) {
+      } else {
+        REGB1 = TAG_Bool(fra.me.REG[7]==NIT_NULL);
+        if (UNTAG_Bool(REGB1)) {
+          REGB1 = TAG_Bool(false);
+          REGB0 = REGB1;
+        } else {
+          REGB1 = CALL_kernel___Object_____eqeq(fra.me.REG[7])(fra.me.REG[7], fra.me.REG[6]);
+          REGB0 = REGB1;
+        }
+      }
+      if (UNTAG_Bool(REGB0)) {
+        REGB0 = TAG_Bool(IS_EQUAL_NN(fra.me.REG[8],fra.me.REG[6]));
+        if (UNTAG_Bool(REGB0)) {
+        } else {
+          REGB1 = TAG_Bool(fra.me.REG[8]==NIT_NULL);
+          if (UNTAG_Bool(REGB1)) {
+            REGB1 = TAG_Bool(false);
+            REGB0 = REGB1;
+          } else {
+            REGB1 = CALL_kernel___Object_____eqeq(fra.me.REG[8])(fra.me.REG[8], fra.me.REG[6]);
+            REGB0 = REGB1;
+          }
+        }
+      } else {
+        REGB1 = TAG_Bool(false);
+        REGB0 = REGB1;
+      }
+      if (UNTAG_Bool(REGB0)) {
+      } else {
+        REGB0 = TAG_Bool(IS_EQUAL_NN(fra.me.REG[7],fra.me.REG[8]));
+        /* ./syntax//control_flow.nit:167 */
+        if (UNTAG_Bool(REGB0)) {
+        } else {
+          REGB1 = TAG_Bool(fra.me.REG[7]==NIT_NULL);
+          if (UNTAG_Bool(REGB1)) {
+            REGB1 = TAG_Bool(false);
+            REGB0 = REGB1;
+          } else {
+            REGB1 = CALL_kernel___Object_____eqeq(fra.me.REG[7])(fra.me.REG[7], fra.me.REG[8]);
+            REGB0 = REGB1;
+          }
+        }
+        if (UNTAG_Bool(REGB0)) {
+          /* ./syntax//control_flow.nit:168 */
+          CALL_control_flow___VariableContext___stype__eq(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[5], fra.me.REG[7]);
+        } else {
+          REGB0 = TAG_Bool(fra.me.REG[8]==NIT_NULL);
+          /* ./syntax//control_flow.nit:169 */
+          if (UNTAG_Bool(REGB0)) {
+          } else {
+            REGB1 = TAG_Bool(fra.me.REG[8]==NIT_NULL);
+            if (UNTAG_Bool(REGB1)) {
+              REGB1 = TAG_Bool(false);
+              REGB0 = REGB1;
+            } else {
+              REGB1 = CALL_kernel___Object_____eqeq(fra.me.REG[8])(fra.me.REG[8], NIT_NULL);
+              REGB0 = REGB1;
+            }
+          }
+          if (UNTAG_Bool(REGB0)) {
+            REGB0 = TAG_Bool(true);
+          } else {
+            REGB1 = TAG_Bool(fra.me.REG[7]==NIT_NULL);
+            if (UNTAG_Bool(REGB1)) {
+              fprintf(stderr, "Reciever is null");
+              fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 169);
+              nit_exit(1);
+            }
+            REGB1 = CALL_static_type___MMType_____l(fra.me.REG[7])(fra.me.REG[7], fra.me.REG[8]);
+            REGB0 = REGB1;
+          }
+          if (UNTAG_Bool(REGB0)) {
+            /* ./syntax//control_flow.nit:170 */
+            CALL_control_flow___VariableContext___stype__eq(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[5], fra.me.REG[8]);
+          } else {
+            REGB0 = TAG_Bool(fra.me.REG[7]==NIT_NULL);
+            /* ./syntax//control_flow.nit:171 */
+            if (UNTAG_Bool(REGB0)) {
+            } else {
+              REGB1 = TAG_Bool(fra.me.REG[7]==NIT_NULL);
+              if (UNTAG_Bool(REGB1)) {
+               REGB1 = TAG_Bool(false);
+               REGB0 = REGB1;
+              } else {
+               REGB1 = CALL_kernel___Object_____eqeq(fra.me.REG[7])(fra.me.REG[7], NIT_NULL);
+               REGB0 = REGB1;
+              }
+            }
+            if (UNTAG_Bool(REGB0)) {
+              REGB0 = TAG_Bool(true);
+            } else {
+              REGB1 = TAG_Bool(fra.me.REG[8]==NIT_NULL);
+              if (UNTAG_Bool(REGB1)) {
+               fprintf(stderr, "Reciever is null");
+               fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 171);
+               nit_exit(1);
+              }
+              REGB1 = CALL_static_type___MMType_____l(fra.me.REG[8])(fra.me.REG[8], fra.me.REG[7]);
+              REGB0 = REGB1;
+            }
+            if (UNTAG_Bool(REGB0)) {
+              /* ./syntax//control_flow.nit:172 */
+              CALL_control_flow___VariableContext___stype__eq(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[5], fra.me.REG[7]);
+            } else {
+              fra.me.REG[7] = CALL_control_flow___VariableContext___stype(fra.me.REG[3])(fra.me.REG[3], fra.me.REG[5]);
+              /* ./syntax//control_flow.nit:174 */
+              CALL_control_flow___VariableContext___stype__eq(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[5], fra.me.REG[7]);
+            }
+          }
+        }
       }
-      continue_22: while(0);
-      ((abstract_collection___Iterator___next_t)CALL(variable3,COLOR_abstract_collection___Iterator___next))(variable3) /*Iterator::next*/;
+    } else {
+      /* ./syntax//control_flow.nit:157 */
+      goto label1;
     }
-    break_22: while(0);
-    ((control_flow___ControlFlowVisitor___control_flow_ctx__eq_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx__eq))( variable0 /*v*/,  variable1 /*old_control_flow_ctx*/) /*ControlFlowVisitor::control_flow_ctx=*/;
+    CALL_abstract_collection___Iterator___next(fra.me.REG[4])(fra.me.REG[4]);
   }
-  tracehead = trace.prev;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
   return;
 }
-void control_flow___AControlableBlock___accept_control_flow(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 261, LOCATE_control_flow___AControlableBlock___accept_control_flow};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 =  param0;
-  variable2 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( variable0 /*v*/) /*ControlFlowVisitor::control_flow_ctx*/;
-  variable1 = variable2;
-  variable2 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( variable0 /*v*/) /*ControlFlowVisitor::control_flow_ctx*/;
-  variable2 = ((control_flow___ControlFlowContext___sub_t)CALL(variable2,COLOR_control_flow___ControlFlowContext___sub))(variable2) /*ControlFlowContext::sub*/;
-  ((control_flow___ControlFlowVisitor___control_flow_ctx__eq_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx__eq))( variable0 /*v*/, variable2) /*ControlFlowVisitor::control_flow_ctx=*/;
-  variable2 = ((control_flow___ControlFlowVisitor___control_flow_ctx_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx))( variable0 /*v*/) /*ControlFlowVisitor::control_flow_ctx*/;
-  ((control_flow___ControlFlowContext___base_block__eq_t)CALL(variable2,COLOR_control_flow___ControlFlowContext___base_block__eq))(variable2,  self) /*ControlFlowContext::base_block=*/;
-  ((control_flow___AControlableBlock___accept_control_flow_t)CALL( self,COLOR_SUPER_control_flow___AControlableBlock___accept_control_flow))( self,  param0) /*super AControlableBlock::accept_control_flow*/;
-  ((control_flow___ControlFlowVisitor___control_flow_ctx__eq_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___control_flow_ctx__eq))( variable0 /*v*/,  variable1 /*old_control_flow_ctx*/) /*ControlFlowVisitor::control_flow_ctx=*/;
-  tracehead = trace.prev;
+void control_flow___RootVariableContext___init(val_t p0, val_t p1, val_t p2, int* init_table){
+  int itpos1 = VAL2OBJ(p0)->vft[INIT_TABLE_POS_RootVariableContext].i;
+  struct {struct stack_frame_t me; val_t MORE_REG[3];} fra;
+  val_t tmp;
+  if (init_table[itpos1]) return;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 194;
+  fra.me.meth = LOCATE_control_flow___RootVariableContext___init;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 4;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[3] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  fra.me.REG[2] = p2;
+  fra.me.REG[3] = fra.me.REG[0];
+  /* ./syntax//control_flow.nit:196 */
+  CALL_control_flow___VariableContext___init(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1], fra.me.REG[2], init_table);
+  fra.me.REG[2] = NEW_HashSet_hash_collection___HashSet___init();
+  /* ./syntax//control_flow.nit:197 */
+  ATTR_control_flow___VariableContext____all_variables(fra.me.REG[3]) = fra.me.REG[2];
+  stack_frame_head = fra.me.prev;
+  init_table[itpos1] = 1;
   return;
 }
-void control_flow___AForVardeclExpr___accept_control_flow(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 286, LOCATE_control_flow___AForVardeclExpr___accept_control_flow};
-  val_t variable0;
-  val_t variable1;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 =  param0;
-  ((control_flow___AForVardeclExpr___accept_control_flow_t)CALL( self,COLOR_SUPER_control_flow___AForVardeclExpr___accept_control_flow))( self,  param0) /*super AForVardeclExpr::accept_control_flow*/;
-  variable1 = ((syntax_base___AForVardeclExpr___variable_t)CALL( self,COLOR_syntax_base___AForVardeclExpr___variable))( self) /*AForVardeclExpr::variable*/;
-  ((control_flow___ControlFlowVisitor___mark_is_set_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___mark_is_set))( variable0 /*v*/, variable1) /*ControlFlowVisitor::mark_is_set*/;
-  tracehead = trace.prev;
-  return;
+val_t control_flow___SubVariableContext_____bra(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[2];} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 205;
+  fra.me.meth = LOCATE_control_flow___SubVariableContext_____bra;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 3;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____dico(fra.me.REG[0])!=NIT_NULL);
+  /* ./syntax//control_flow.nit:207 */
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    fprintf(stderr, "Uninitialized attribute %s", "_dico");
+    fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 207);
+    nit_exit(1);
+  }
+  fra.me.REG[2] = ATTR_control_flow___VariableContext____dico(fra.me.REG[0]);
+  REGB0 = CALL_abstract_collection___MapRead___has_key(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[1]);
+  if (UNTAG_Bool(REGB0)) {
+    REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____dico(fra.me.REG[0])!=NIT_NULL);
+    /* ./syntax//control_flow.nit:208 */
+    if (UNTAG_Bool(REGB0)) {
+    } else {
+      fprintf(stderr, "Uninitialized attribute %s", "_dico");
+      fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 208);
+      nit_exit(1);
+    }
+    fra.me.REG[2] = ATTR_control_flow___VariableContext____dico(fra.me.REG[0]);
+    fra.me.REG[2] = CALL_abstract_collection___MapRead_____bra(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[1]);
+    goto label1;
+  } else {
+    fra.me.REG[0] = CALL_control_flow___SubVariableContext___prev(fra.me.REG[0])(fra.me.REG[0]);
+    fra.me.REG[1] = CALL_control_flow___VariableContext_____bra(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
+    fra.me.REG[2] = fra.me.REG[1];
+    /* ./syntax//control_flow.nit:210 */
+    goto label1;
+  }
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[2];
 }
-void control_flow___AVarExpr___accept_control_flow(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 295, LOCATE_control_flow___AVarExpr___accept_control_flow};
-  val_t variable0;
-  val_t variable1;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 =  param0;
-  ((control_flow___AVarExpr___accept_control_flow_t)CALL( self,COLOR_SUPER_control_flow___AVarExpr___accept_control_flow))( self,  param0) /*super AVarExpr::accept_control_flow*/;
-  variable1 = ((syntax_base___AVarFormExpr___variable_t)CALL( self,COLOR_syntax_base___AVarFormExpr___variable))( self) /*AVarFormExpr::variable*/;
-  ((control_flow___ControlFlowVisitor___check_is_set_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___check_is_set))( variable0 /*v*/,  self, variable1) /*ControlFlowVisitor::check_is_set*/;
-  tracehead = trace.prev;
-  return;
+val_t control_flow___SubVariableContext___stype(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[2];} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 214;
+  fra.me.meth = LOCATE_control_flow___SubVariableContext___stype;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 3;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____stypes(fra.me.REG[0])!=NIT_NULL);
+  /* ./syntax//control_flow.nit:216 */
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    fprintf(stderr, "Uninitialized attribute %s", "_stypes");
+    fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 216);
+    nit_exit(1);
+  }
+  fra.me.REG[2] = ATTR_control_flow___VariableContext____stypes(fra.me.REG[0]);
+  REGB0 = CALL_abstract_collection___MapRead___has_key(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[1]);
+  if (UNTAG_Bool(REGB0)) {
+    REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____stypes(fra.me.REG[0])!=NIT_NULL);
+    /* ./syntax//control_flow.nit:217 */
+    if (UNTAG_Bool(REGB0)) {
+    } else {
+      fprintf(stderr, "Uninitialized attribute %s", "_stypes");
+      fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 217);
+      nit_exit(1);
+    }
+    fra.me.REG[2] = ATTR_control_flow___VariableContext____stypes(fra.me.REG[0]);
+    fra.me.REG[2] = CALL_abstract_collection___MapRead_____bra(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[1]);
+    goto label1;
+  } else {
+    fra.me.REG[0] = CALL_control_flow___SubVariableContext___prev(fra.me.REG[0])(fra.me.REG[0]);
+    fra.me.REG[1] = CALL_control_flow___VariableContext___stype(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
+    fra.me.REG[2] = fra.me.REG[1];
+    /* ./syntax//control_flow.nit:219 */
+    goto label1;
+  }
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[2];
 }
-void control_flow___AVarAssignExpr___accept_control_flow(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 303, LOCATE_control_flow___AVarAssignExpr___accept_control_flow};
-  val_t variable0;
-  val_t variable1;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 =  param0;
-  ((control_flow___AVarAssignExpr___accept_control_flow_t)CALL( self,COLOR_SUPER_control_flow___AVarAssignExpr___accept_control_flow))( self,  param0) /*super AVarAssignExpr::accept_control_flow*/;
-  variable1 = ((syntax_base___AVarFormExpr___variable_t)CALL( self,COLOR_syntax_base___AVarFormExpr___variable))( self) /*AVarFormExpr::variable*/;
-  ((control_flow___ControlFlowVisitor___mark_is_set_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___mark_is_set))( variable0 /*v*/, variable1) /*ControlFlowVisitor::mark_is_set*/;
-  tracehead = trace.prev;
-  return;
+val_t control_flow___SubVariableContext___is_set(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[2];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 230;
+  fra.me.meth = LOCATE_control_flow___SubVariableContext___is_set;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 3;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____set_variables(fra.me.REG[0])!=NIT_NULL);
+  /* ./syntax//control_flow.nit:232 */
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    fprintf(stderr, "Uninitialized attribute %s", "_set_variables");
+    fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 232);
+    nit_exit(1);
+  }
+  fra.me.REG[2] = ATTR_control_flow___VariableContext____set_variables(fra.me.REG[0]);
+  REGB0 = CALL_abstract_collection___Collection___has(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[1]);
+  if (UNTAG_Bool(REGB0)) {
+    REGB0 = TAG_Bool(true);
+  } else {
+    REGB1 = TAG_Bool(ATTR_control_flow___SubVariableContext____prev(fra.me.REG[0])!=NIT_NULL);
+    if (UNTAG_Bool(REGB1)) {
+    } else {
+      fprintf(stderr, "Uninitialized attribute %s", "_prev");
+      fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 232);
+      nit_exit(1);
+    }
+    fra.me.REG[0] = ATTR_control_flow___SubVariableContext____prev(fra.me.REG[0]);
+    REGB1 = CALL_control_flow___VariableContext___is_set(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
+    REGB0 = REGB1;
+  }
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
 }
-void control_flow___AVarReassignExpr___accept_control_flow(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 311, LOCATE_control_flow___AVarReassignExpr___accept_control_flow};
-  val_t variable0;
-  val_t variable1;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 =  param0;
-  ((control_flow___AVarReassignExpr___accept_control_flow_t)CALL( self,COLOR_SUPER_control_flow___AVarReassignExpr___accept_control_flow))( self,  param0) /*super AVarReassignExpr::accept_control_flow*/;
-  variable1 = ((syntax_base___AVarFormExpr___variable_t)CALL( self,COLOR_syntax_base___AVarFormExpr___variable))( self) /*AVarFormExpr::variable*/;
-  ((control_flow___ControlFlowVisitor___check_is_set_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___check_is_set))( variable0 /*v*/,  self, variable1) /*ControlFlowVisitor::check_is_set*/;
-  variable1 = ((syntax_base___AVarFormExpr___variable_t)CALL( self,COLOR_syntax_base___AVarFormExpr___variable))( self) /*AVarFormExpr::variable*/;
-  ((control_flow___ControlFlowVisitor___mark_is_set_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___mark_is_set))( variable0 /*v*/, variable1) /*ControlFlowVisitor::mark_is_set*/;
-  tracehead = trace.prev;
-  return;
+val_t control_flow___SubVariableContext___prev(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 203;
+  fra.me.meth = LOCATE_control_flow___SubVariableContext___prev;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  REGB0 = TAG_Bool(ATTR_control_flow___SubVariableContext____prev(fra.me.REG[0])!=NIT_NULL);
+  /* ./syntax//control_flow.nit:203 */
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    fprintf(stderr, "Uninitialized attribute %s", "_prev");
+    fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 203);
+    nit_exit(1);
+  }
+  fra.me.REG[0] = ATTR_control_flow___SubVariableContext____prev(fra.me.REG[0]);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
 }
-void control_flow___AOnceExpr___accept_control_flow(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, LOCATE_control_flow, 321, LOCATE_control_flow___AOnceExpr___accept_control_flow};
-  val_t variable0;
-  val_t variable1;
-  trace.prev = tracehead; tracehead = &trace;
-  variable0 =  param0;
-  variable1 = ((control_flow___ControlFlowVisitor___once_count_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___once_count))( variable0 /*v*/) /*ControlFlowVisitor::once_count*/;
-  variable1 = TAG_Bool(UNTAG_Int(variable1)>UNTAG_Int( TAG_Int(0)));
-  if (UNTAG_Bool(variable1)) { /*if*/
-    variable1 = NEW_string___String___with_native(BOX_NativeString("Useless once in a once expression."), TAG_Int(34)); /*new String*/
-    ((syntax_base___AbsSyntaxVisitor___warning_t)CALL( variable0 /*v*/,COLOR_syntax_base___AbsSyntaxVisitor___warning))( variable0 /*v*/,  self, variable1) /*AbsSyntaxVisitor::warning*/;
-  }
-  variable1 = ((control_flow___ControlFlowVisitor___once_count_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___once_count))( variable0 /*v*/) /*ControlFlowVisitor::once_count*/;
-  variable1 = TAG_Int(UNTAG_Int(variable1)+UNTAG_Int( TAG_Int(1)));
-  ((control_flow___ControlFlowVisitor___once_count__eq_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___once_count__eq))( variable0 /*v*/, variable1) /*ControlFlowVisitor::once_count=*/;
-  ((control_flow___AOnceExpr___accept_control_flow_t)CALL( self,COLOR_SUPER_control_flow___AOnceExpr___accept_control_flow))( self,  param0) /*super AOnceExpr::accept_control_flow*/;
-  variable1 = ((control_flow___ControlFlowVisitor___once_count_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___once_count))( variable0 /*v*/) /*ControlFlowVisitor::once_count*/;
-  variable1 = TAG_Int(UNTAG_Int(variable1)-UNTAG_Int( TAG_Int(1)));
-  ((control_flow___ControlFlowVisitor___once_count__eq_t)CALL( variable0 /*v*/,COLOR_control_flow___ControlFlowVisitor___once_count__eq))( variable0 /*v*/, variable1) /*ControlFlowVisitor::once_count=*/;
-  tracehead = trace.prev;
+void control_flow___SubVariableContext___with_prev(val_t p0, val_t p1, val_t p2, int* init_table){
+  int itpos2 = VAL2OBJ(p0)->vft[INIT_TABLE_POS_SubVariableContext].i;
+  struct {struct stack_frame_t me; val_t MORE_REG[3];} fra;
+  val_t REGB0;
+  val_t tmp;
+  if (init_table[itpos2]) return;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 223;
+  fra.me.meth = LOCATE_control_flow___SubVariableContext___with_prev;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 4;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[3] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  fra.me.REG[2] = p2;
+  REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____visitor(fra.me.REG[1])!=NIT_NULL);
+  /* ./syntax//control_flow.nit:225 */
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    fprintf(stderr, "Uninitialized attribute %s", "_visitor");
+    fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 225);
+    nit_exit(1);
+  }
+  fra.me.REG[3] = ATTR_control_flow___VariableContext____visitor(fra.me.REG[1]);
+  CALL_control_flow___VariableContext___init(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[3], fra.me.REG[2], init_table);
+  /* ./syntax//control_flow.nit:226 */
+  ATTR_control_flow___SubVariableContext____prev(fra.me.REG[0]) = fra.me.REG[1];
+  REGB0 = TAG_Bool(ATTR_control_flow___VariableContext____all_variables(fra.me.REG[1])!=NIT_NULL);
+  /* ./syntax//control_flow.nit:227 */
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    fprintf(stderr, "Uninitialized attribute %s", "_all_variables");
+    fprintf(stderr, " (%s:%d)\n", LOCATE_control_flow, 227);
+    nit_exit(1);
+  }
+  fra.me.REG[1] = ATTR_control_flow___VariableContext____all_variables(fra.me.REG[1]);
+  ATTR_control_flow___VariableContext____all_variables(fra.me.REG[0]) = fra.me.REG[1];
+  stack_frame_head = fra.me.prev;
+  init_table[itpos2] = 1;
   return;
 }
+val_t control_flow___Variable___must_be_set(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 237;
+  fra.me.meth = LOCATE_control_flow___Variable___must_be_set;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  REGB0 = TAG_Bool(false);
+  /* ./syntax//control_flow.nit:238 */
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
+}
+val_t control_flow___VarVariable___must_be_set(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_control_flow;
+  fra.me.line = 242;
+  fra.me.meth = LOCATE_control_flow___VarVariable___must_be_set;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  REGB0 = TAG_Bool(true);
+  /* ./syntax//control_flow.nit:242 */
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
+}