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

diff --git a/c_src/control_flow._sep.c b/c_src/control_flow._sep.c
index a0b95d0..6d4fe53 100644
--- a/c_src/control_flow._sep.c
+++ b/c_src/control_flow._sep.c
@@ -1,867 +1,1309 @@
 /* This C file is generated by NIT to compile module control_flow. */
 #include "control_flow._sep.h"
-val_t control_flow___VariableContext___to_s(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 183, LOCATE_control_flow___VariableContext___to_s};
-    static val_t once_value_2 = NIT_NULL; /* Once value for string variable[8]*/
-    static val_t once_value_3 = NIT_NULL; /* Once value for string variable[8]*/
-    static val_t once_value_4 = NIT_NULL; /* Once value for string variable[8]*/
-  val_t variable[9];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Method return value and escape marker */
-  /* Register variable[2]: Local variable */
-  /* Register variable[3]: Result */
-  variable[3] = NEW_Buffer_string___Buffer___init() /*new Buffer*/;
-  variable[2] = variable[3];
-  /* Register variable[3]: Result */
-  variable[3] = CALL_control_flow___VariableContext___node(variable[0])(variable[0]) /*VariableContext::node*/;
-  /* Register variable[3]: Result */
-  variable[3] = CALL_parser_prod___PNode___locate(variable[3])(variable[3]) /*PNode::locate*/;
-  CALL_abstract_collection___IndexedCollection___append( variable[2] /*s*/)( variable[2] /*s*/, variable[3]) /*Buffer::append*/;
-  /* Register variable[3]: Result */
-  variable[3] = ATTR_control_flow___VariableContext____all_variables(variable[0]) /*VariableContext::_all_variables*/;
-  /* Register variable[3]: For iterator */
-  variable[3] = CALL_abstract_collection___Collection___iterator(variable[3])(variable[3]) /*Collection::iterator*/;
-  while (true) { /*for*/
-    /* Register variable[4]: For 'is_ok' result */
-    variable[4] = CALL_abstract_collection___Iterator___is_ok(variable[3])(variable[3]) /*Iterator::is_ok*/;
-    if (!UNTAG_Bool(variable[4])) break; /*for*/
-    variable[4] = CALL_abstract_collection___Iterator___item(variable[3])(variable[3]) /*Iterator::item*/ /* Ensure var: For item*/;
-    /* Register variable[5]: Local variable */
-    variable[5] = variable[4];
-    /* Register variable[6]: Local variable */
-    /* Register variable[7]: Result */
-    variable[7] = CALL_control_flow___VariableContext___stype(variable[0])(variable[0],  variable[5] /*v*/) /*VariableContext::stype*/;
-    variable[6] = variable[7];
-    /* Register variable[7]: Result */
-    variable[7] = TAG_Bool(( variable[6] /*t*/ ==  NIT_NULL /*null*/) || (( variable[6] /*t*/ != NIT_NULL) && ((CALL_kernel___Object_____eqeq( variable[6] /*t*/)==kernel___Object_____eqeq)?(IS_EQUAL_NN( variable[6] /*t*/, NIT_NULL /*null*/)):(UNTAG_Bool(CALL_kernel___Object_____eqeq( variable[6] /*t*/)( variable[6] /*t*/,  NIT_NULL /*null*/) /*Object::==*/)))));
-    if (UNTAG_Bool(variable[7])) { /*if*/
-      goto continue_1;
+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;
     }
-    variable[7] = NEW_Array_array___Array___with_capacity(TAG_Int(5)) /*new Array[String]*/ /* Ensure var: Array (for super-string)*/;
-    /* Register variable[8]: Once String constant */
-    if (once_value_2 != NIT_NULL) variable[8] = once_value_2;
-    else {
-      variable[8] = NEW_String_string___String___with_native(BOX_NativeString(" "), TAG_Int(1)) /*new String*/;
-      once_value_2 = variable[8];
+    CALL_abstract_collection___Iterator___next(fra.me.REG[2])(fra.me.REG[2]);
+  }
+  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];
+}
+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);
     }
-    /* Register variable[8]: Result */
-    /* Ensure var variable[8]: super-string element*/
-    CALL_abstract_collection___SimpleCollection___add(variable[7])(variable[7], variable[8]) /*AbstractArray::add*/;
-    variable[8] =  variable[5] /*v*/ /* Ensure var: super-string element*/;
-    CALL_abstract_collection___SimpleCollection___add(variable[7])(variable[7], CALL_string___Object___to_s(variable[8])(variable[8]) /*Object::to_s*/) /*AbstractArray::add*/;
-    /* Register variable[8]: Once String constant */
-    if (once_value_3 != NIT_NULL) variable[8] = once_value_3;
-    else {
-      variable[8] = NEW_String_string___String___with_native(BOX_NativeString(":"), TAG_Int(1)) /*new String*/;
-      once_value_3 = variable[8];
+    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___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;
     }
-    /* Register variable[8]: Result */
-    /* Ensure var variable[8]: super-string element*/
-    CALL_abstract_collection___SimpleCollection___add(variable[7])(variable[7], variable[8]) /*AbstractArray::add*/;
-    variable[8] =  variable[6] /*t*/ /* Ensure var: super-string element*/;
-    CALL_abstract_collection___SimpleCollection___add(variable[7])(variable[7], CALL_string___Object___to_s(variable[8])(variable[8]) /*Object::to_s*/) /*AbstractArray::add*/;
-    /* Register variable[8]: Once String constant */
-    if (once_value_4 != NIT_NULL) variable[8] = once_value_4;
-    else {
-      variable[8] = NEW_String_string___String___with_native(BOX_NativeString(""), TAG_Int(0)) /*new String*/;
-      once_value_4 = variable[8];
+  }
+  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);
     }
-    /* Register variable[8]: Result */
-    /* Ensure var variable[8]: super-string element*/
-    CALL_abstract_collection___SimpleCollection___add(variable[7])(variable[7], variable[8]) /*AbstractArray::add*/;
-    /* Register variable[7]: Result */
-    variable[7] = CALL_string___Object___to_s(variable[7])(variable[7]) /*Object::to_s*/;
-    CALL_abstract_collection___IndexedCollection___append( variable[2] /*s*/)( variable[2] /*s*/, variable[7]) /*Buffer::append*/;
-    continue_1: while(0);
-    CALL_abstract_collection___Iterator___next(variable[3])(variable[3]) /*Iterator::next*/;
-  }
-  break_1: while(0);
-  /* Register variable[3]: Result */
-  variable[3] = CALL_string___Object___to_s( variable[2] /*s*/)( variable[2] /*s*/) /*Buffer::to_s*/;
-  variable[1] = variable[3];
-  goto return_label0;
-  return_label0: while(false);
-  tracehead = trace.prev;
-  return variable[1];
-}
-val_t control_flow___VariableContext_____bra(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 25, LOCATE_control_flow___VariableContext_____bra};
-  val_t variable[4];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Local variable */
-  variable[1] =  param0;
-  /* Register variable[2]: Method return value and escape marker */
-  /* Register variable[3]: Result */
-  variable[3] = ATTR_control_flow___VariableContext____dico(variable[0]) /*VariableContext::_dico*/;
-  /* Register variable[3]: Result */
-  variable[3] = CALL_abstract_collection___MapRead___has_key(variable[3])(variable[3],  variable[1] /*s*/) /*MapRead::has_key*/;
-  if (UNTAG_Bool(variable[3])) { /*if*/
-    /* Register variable[3]: Result */
-    variable[3] = ATTR_control_flow___VariableContext____dico(variable[0]) /*VariableContext::_dico*/;
-    /* Register variable[3]: Result */
-    variable[3] = CALL_abstract_collection___MapRead_____bra(variable[3])(variable[3],  variable[1] /*s*/) /*MapRead::[]*/;
-    variable[2] = variable[3];
-    goto return_label5;
-  } else { /*if*/
-    variable[2] =  NIT_NULL /*null*/;
-    goto return_label5;
-  }
-  return_label5: while(false);
-  tracehead = trace.prev;
-  return variable[2];
-}
-void control_flow___VariableContext___add(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 36, LOCATE_control_flow___VariableContext___add};
-  val_t variable[5];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Local variable */
-  variable[1] =  param0;
-  /* Register variable[2]: Method return value and escape marker */
-  /* Register variable[3]: Result */
-  variable[3] = ATTR_control_flow___VariableContext____dico(variable[0]) /*VariableContext::_dico*/;
-  /* Register variable[4]: Result */
-  variable[4] = CALL_syntax_base___Variable___name( variable[1] /*v*/)( variable[1] /*v*/) /*Variable::name*/;
-  CALL_abstract_collection___Map_____braeq(variable[3])(variable[3], variable[4],  variable[1] /*v*/) /*Map::[]=*/;
-  /* Register variable[3]: Result */
-  variable[3] = ATTR_control_flow___VariableContext____all_variables(variable[0]) /*VariableContext::_all_variables*/;
-  CALL_abstract_collection___SimpleCollection___add(variable[3])(variable[3],  variable[1] /*v*/) /*SimpleCollection::add*/;
-  return_label6: while(false);
-  tracehead = trace.prev;
+    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;
 }
-void control_flow___VariableContext___mark_is_set(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 43, LOCATE_control_flow___VariableContext___mark_is_set};
-  val_t variable[4];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Local variable */
-  variable[1] =  param0;
-  /* Register variable[2]: Method return value and escape marker */
-  /* Register variable[3]: Result */
-  variable[3] = ATTR_control_flow___VariableContext____set_variables(variable[0]) /*VariableContext::_set_variables*/;
-  CALL_abstract_collection___SimpleCollection___add(variable[3])(variable[3],  variable[1] /*v*/) /*HashSet::add*/;
-  return_label7: while(false);
-  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;
 }
-void control_flow___VariableContext___check_is_set(val_t  self, val_t  param0, val_t  param1) {
-  struct trace_t trace = {NULL, NULL, 48, LOCATE_control_flow___VariableContext___check_is_set};
-    static val_t once_value_9 = NIT_NULL; /* Once value for string variable[6]*/
-    static val_t once_value_10 = NIT_NULL; /* Once value for string variable[6]*/
-      static val_t once_value_12 = NIT_NULL; /* Once value for string variable[6]*/
-      static val_t once_value_13 = NIT_NULL; /* Once value for string variable[6]*/
-      static val_t once_value_14 = NIT_NULL; /* Once value for string variable[7]*/
-      static val_t once_value_15 = NIT_NULL; /* Once value for string variable[6]*/
-      static val_t once_value_16 = NIT_NULL; /* Once value for string variable[7]*/
-      static val_t once_value_17 = NIT_NULL; /* Once value for string variable[6]*/
-  val_t variable[8];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Local variable */
-  variable[1] =  param0;
-  /* Register variable[2]: Local variable */
-  variable[2] =  param1;
-  /* Register variable[3]: Method return value and escape marker */
-  /* Register variable[4]: Result */
-  variable[4] = CALL_control_flow___Variable___must_be_set( variable[2] /*v*/)( variable[2] /*v*/) /*Variable::must_be_set*/;
-  /* Ensure var variable[4]: Left 'and' operand*/
-  if (UNTAG_Bool(variable[4])) { /* and */
-    /* Register variable[4]: Result */
-    variable[4] = CALL_control_flow___VariableContext___is_set(variable[0])(variable[0],  variable[2] /*v*/) /*VariableContext::is_set*/;
-    variable[4] =  TAG_Bool(!UNTAG_Bool(variable[4]));
-  }
-  /* Register variable[4]: Result */
-  if (UNTAG_Bool(variable[4])) { /*if*/
-    /* Register variable[4]: Result */
-    variable[4] = ATTR_control_flow___VariableContext____visitor(variable[0]) /*VariableContext::_visitor*/;
-    variable[5] = NEW_Array_array___Array___with_capacity(TAG_Int(3)) /*new Array[String]*/ /* Ensure var: Array (for super-string)*/;
-    /* Register variable[6]: Once String constant */
-    if (once_value_9 != NIT_NULL) variable[6] = once_value_9;
-    else {
-      variable[6] = NEW_String_string___String___with_native(BOX_NativeString("Error: variable '"), TAG_Int(17)) /*new String*/;
-      once_value_9 = variable[6];
-    }
-    /* Register variable[6]: Result */
-    /* Ensure var variable[6]: super-string element*/
-    CALL_abstract_collection___SimpleCollection___add(variable[5])(variable[5], variable[6]) /*AbstractArray::add*/;
-    variable[6] =  variable[2] /*v*/ /* Ensure var: super-string element*/;
-    CALL_abstract_collection___SimpleCollection___add(variable[5])(variable[5], CALL_string___Object___to_s(variable[6])(variable[6]) /*Object::to_s*/) /*AbstractArray::add*/;
-    /* Register variable[6]: Once String constant */
-    if (once_value_10 != NIT_NULL) variable[6] = once_value_10;
-    else {
-      variable[6] = NEW_String_string___String___with_native(BOX_NativeString("' is possibly unset."), TAG_Int(20)) /*new String*/;
-      once_value_10 = variable[6];
+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);
     }
-    /* Register variable[6]: Result */
-    /* Ensure var variable[6]: super-string element*/
-    CALL_abstract_collection___SimpleCollection___add(variable[5])(variable[5], variable[6]) /*AbstractArray::add*/;
-    /* Register variable[5]: Result */
-    variable[5] = CALL_string___Object___to_s(variable[5])(variable[5]) /*Object::to_s*/;
-    CALL_syntax_base___AbsSyntaxVisitor___error(variable[4])(variable[4],  variable[1] /*n*/, variable[5]) /*AbsSyntaxVisitor::error*/;
-    /* Register variable[4]: Local variable */
-    variable[4] = variable[0];
-    while (true) { /*while*/
-      if (!UNTAG_Bool( TAG_Bool(true))) break; /* while*/
-      variable[5] = NEW_Array_array___Array___with_capacity(TAG_Int(7)) /*new Array[String]*/ /* Ensure var: Array (for super-string)*/;
-      /* Register variable[6]: Once String constant */
-      if (once_value_12 != NIT_NULL) variable[6] = once_value_12;
-      else {
-        variable[6] = NEW_String_string___String___with_native(BOX_NativeString("  "), TAG_Int(2)) /*new String*/;
-        once_value_12 = variable[6];
-      }
-      /* Register variable[6]: Result */
-      /* Ensure var variable[6]: super-string element*/
-      CALL_abstract_collection___SimpleCollection___add(variable[5])(variable[5], variable[6]) /*AbstractArray::add*/;
-      /* Register variable[6]: Result */
-      variable[6] = CALL_control_flow___VariableContext___node( variable[4] /*x*/)( variable[4] /*x*/) /*VariableContext::node*/;
-      /* Register variable[6]: Result */
-      variable[6] = CALL_parser_prod___PNode___locate(variable[6])(variable[6]) /*PNode::locate*/;
-      /* Ensure var variable[6]: super-string element*/
-      CALL_abstract_collection___SimpleCollection___add(variable[5])(variable[5], variable[6]) /*AbstractArray::add*/;
-      /* Register variable[6]: Once String constant */
-      if (once_value_13 != NIT_NULL) variable[6] = once_value_13;
-      else {
-        variable[6] = NEW_String_string___String___with_native(BOX_NativeString(": "), TAG_Int(2)) /*new String*/;
-        once_value_13 = variable[6];
-      }
-      /* Register variable[6]: Result */
-      /* Ensure var variable[6]: super-string element*/
-      CALL_abstract_collection___SimpleCollection___add(variable[5])(variable[5], variable[6]) /*AbstractArray::add*/;
-      /* Register variable[6]: Result */
-      variable[6] = ATTR_control_flow___VariableContext____set_variables( variable[4] /*x*/) /*VariableContext::_set_variables*/;
-      /* Register variable[7]: Once String constant */
-      if (once_value_14 != NIT_NULL) variable[7] = once_value_14;
-      else {
-        variable[7] = NEW_String_string___String___with_native(BOX_NativeString(", "), TAG_Int(2)) /*new String*/;
-        once_value_14 = variable[7];
-      }
-      /* Register variable[7]: Result */
-      /* Register variable[6]: Result */
-      variable[6] = CALL_string___Collection___join(variable[6])(variable[6], variable[7]) /*Collection::join*/;
-      /* Ensure var variable[6]: super-string element*/
-      CALL_abstract_collection___SimpleCollection___add(variable[5])(variable[5], variable[6]) /*AbstractArray::add*/;
-      /* Register variable[6]: Once String constant */
-      if (once_value_15 != NIT_NULL) variable[6] = once_value_15;
-      else {
-        variable[6] = NEW_String_string___String___with_native(BOX_NativeString(" ; "), TAG_Int(3)) /*new String*/;
-        once_value_15 = variable[6];
-      }
-      /* Register variable[6]: Result */
-      /* Ensure var variable[6]: super-string element*/
-      CALL_abstract_collection___SimpleCollection___add(variable[5])(variable[5], variable[6]) /*AbstractArray::add*/;
-      /* Register variable[6]: Result */
-      variable[6] = ATTR_control_flow___VariableContext____dico( variable[4] /*x*/) /*VariableContext::_dico*/;
-      /* Register variable[7]: Once String constant */
-      if (once_value_16 != NIT_NULL) variable[7] = once_value_16;
-      else {
-        variable[7] = NEW_String_string___String___with_native(BOX_NativeString(", "), TAG_Int(2)) /*new String*/;
-        once_value_16 = variable[7];
-      }
-      /* Register variable[7]: Result */
-      /* Register variable[6]: Result */
-      variable[6] = CALL_string___Collection___join(variable[6])(variable[6], variable[7]) /*Collection::join*/;
-      /* Ensure var variable[6]: super-string element*/
-      CALL_abstract_collection___SimpleCollection___add(variable[5])(variable[5], variable[6]) /*AbstractArray::add*/;
-      /* Register variable[6]: Once String constant */
-      if (once_value_17 != NIT_NULL) variable[6] = once_value_17;
-      else {
-        variable[6] = NEW_String_string___String___with_native(BOX_NativeString(""), TAG_Int(0)) /*new String*/;
-        once_value_17 = variable[6];
+    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;
+        }
       }
-      /* Register variable[6]: Result */
-      /* Ensure var variable[6]: super-string element*/
-      CALL_abstract_collection___SimpleCollection___add(variable[5])(variable[5], variable[6]) /*AbstractArray::add*/;
-      /* Register variable[5]: Result */
-      variable[5] = CALL_string___Object___to_s(variable[5])(variable[5]) /*Object::to_s*/;
-      CALL_file___Object___print(variable[0])(variable[0], variable[5]) /*Object::print*/;
-      /* Register variable[5]: Local variable */
-      variable[5] =  variable[4] /*x*/;
-      /* Register variable[6]: Result */
-      variable[6] = TAG_Bool(( variable[5] /*x0*/==NIT_NULL) || VAL_ISA( variable[5] /*x0*/, COLOR_SubVariableContext, ID_SubVariableContext)) /*cast SubVariableContext*/;
-      if (UNTAG_Bool(variable[6])) { /*if*/
-        /* Register variable[6]: Result */
-        variable[6] = CALL_control_flow___SubVariableContext___prev( variable[5] /*x0*/)( variable[5] /*x0*/) /*SubVariableContext::prev*/;
-        variable[4] = variable[6] /*x=*/;
-      } else { /*if*/
-        goto break_11;
+    } 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);
       }
-      continue_11: while(0);
+      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]);
     }
-    break_11: while(0);
   }
-  return_label8: while(false);
-  tracehead = trace.prev;
+  stack_frame_head = fra.me.prev;
   return;
 }
-val_t control_flow___VariableContext___stype(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 65, LOCATE_control_flow___VariableContext___stype};
-  val_t variable[4];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Local variable */
-  variable[1] =  param0;
-  /* Register variable[2]: Method return value and escape marker */
-  /* Register variable[3]: Result */
-  variable[3] = ATTR_control_flow___VariableContext____stypes(variable[0]) /*VariableContext::_stypes*/;
-  /* Register variable[3]: Result */
-  variable[3] = CALL_abstract_collection___MapRead___has_key(variable[3])(variable[3],  variable[1] /*v*/) /*MapRead::has_key*/;
-  if (UNTAG_Bool(variable[3])) { /*if*/
-    /* Register variable[3]: Result */
-    variable[3] = ATTR_control_flow___VariableContext____stypes(variable[0]) /*VariableContext::_stypes*/;
-    /* Register variable[3]: Result */
-    variable[3] = CALL_abstract_collection___MapRead_____bra(variable[3])(variable[3],  variable[1] /*v*/) /*MapRead::[]*/;
-    variable[2] = variable[3];
-    goto return_label18;
-  } else { /*if*/
-    /* Register variable[3]: Result */
-    variable[3] = CALL_syntax_base___Variable___stype( variable[1] /*v*/)( variable[1] /*v*/) /*Variable::stype*/;
-    variable[2] = variable[3];
-    goto return_label18;
-  }
-  return_label18: while(false);
-  tracehead = trace.prev;
-  return variable[2];
+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___VariableContext___stype__eq(val_t  self, val_t  param0, val_t  param1) {
-  struct trace_t trace = {NULL, NULL, 76, LOCATE_control_flow___VariableContext___stype__eq};
-  val_t variable[5];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Local variable */
-  variable[1] =  param0;
-  /* Register variable[2]: Local variable */
-  variable[2] =  param1;
-  /* Register variable[3]: Method return value and escape marker */
-  /* Register variable[4]: Result */
-  variable[4] = ATTR_control_flow___VariableContext____stypes(variable[0]) /*VariableContext::_stypes*/;
-  CALL_abstract_collection___Map_____braeq(variable[4])(variable[4],  variable[1] /*v*/,  variable[2] /*t*/) /*Map::[]=*/;
-  return_label19: while(false);
-  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___VariableContext___sub(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 92, LOCATE_control_flow___VariableContext___sub};
-  val_t variable[4];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Local variable */
-  variable[1] =  param0;
-  /* Register variable[2]: Method return value and escape marker */
-  /* Register variable[3]: Result */
-  variable[3] = NEW_SubVariableContext_control_flow___SubVariableContext___with_prev(variable[0],  variable[1] /*node*/) /*new SubVariableContext*/;
-  variable[2] = variable[3];
-  goto return_label20;
-  return_label20: while(false);
-  tracehead = trace.prev;
-  return variable[2];
+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___VariableContext___sub_with(val_t  self, val_t  param0, val_t  param1, val_t  param2) {
-  struct trace_t trace = {NULL, NULL, 98, LOCATE_control_flow___VariableContext___sub_with};
-  val_t variable[7];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Local variable */
-  variable[1] =  param0;
-  /* Register variable[2]: Local variable */
-  variable[2] =  param1;
-  /* Register variable[3]: Local variable */
-  variable[3] =  param2;
-  /* Register variable[4]: Method return value and escape marker */
-  /* Register variable[5]: Local variable */
-  /* Register variable[6]: Result */
-  variable[6] = CALL_control_flow___VariableContext___sub(variable[0])(variable[0],  variable[1] /*node*/) /*VariableContext::sub*/;
-  variable[5] = variable[6];
-  CALL_control_flow___VariableContext___stype__eq( variable[5] /*ctx*/)( variable[5] /*ctx*/,  variable[2] /*v*/,  variable[3] /*t*/) /*VariableContext::stype=*/;
-  variable[4] =  variable[5] /*ctx*/;
-  goto return_label21;
-  return_label21: while(false);
-  tracehead = trace.prev;
-  return variable[4];
+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___VariableContext___node(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 109, LOCATE_control_flow___VariableContext___node};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  tracehead = trace.prev;
-  return ATTR_control_flow___VariableContext____node( self) /*VariableContext::_node*/;
+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);
+  }
+  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___VariableContext___init(val_t  self, val_t  param0, val_t  param1, int* init_table) {
-  struct trace_t trace = {NULL, NULL, 112, LOCATE_control_flow___VariableContext___init};
-  val_t variable[5];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Local variable */
-  variable[1] =  param0;
-  /* Register variable[2]: Local variable */
-  variable[2] =  param1;
-  if (init_table[VAL2OBJ(variable[0])->vft[INIT_TABLE_POS_VariableContext].i]) return;
-  /* Register variable[3]: Method return value and escape marker */
-  ATTR_control_flow___VariableContext____visitor(variable[0]) /*VariableContext::_visitor*/ =  variable[1] /*visitor*/;
-  ATTR_control_flow___VariableContext____node(variable[0]) /*VariableContext::_node*/ =  variable[2] /*node*/;
-  /* Register variable[4]: Result */
-  variable[4] = NEW_HashMap_hash___HashMap___init() /*new HashMap[Symbol, Variable]*/;
-  ATTR_control_flow___VariableContext____dico(variable[0]) /*VariableContext::_dico*/ = variable[4];
-  return_label22: while(false);
-  init_table[VAL2OBJ(variable[0])->vft[INIT_TABLE_POS_VariableContext].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;
 }
-val_t control_flow___VariableContext___unreash(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 119, LOCATE_control_flow___VariableContext___unreash};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  tracehead = trace.prev;
-  return ATTR_control_flow___VariableContext____unreash( self) /*VariableContext::_unreash*/;
+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___VariableContext___unreash__eq(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 119, LOCATE_control_flow___VariableContext___unreash__eq};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  ATTR_control_flow___VariableContext____unreash( self) /*VariableContext::_unreash*/ =  param0;
-  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;
 }
-val_t control_flow___VariableContext___already_unreash(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 122, LOCATE_control_flow___VariableContext___already_unreash};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  tracehead = trace.prev;
-  return ATTR_control_flow___VariableContext____already_unreash( self) /*VariableContext::_already_unreash*/;
+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___VariableContext___already_unreash__eq(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 122, LOCATE_control_flow___VariableContext___already_unreash__eq};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  ATTR_control_flow___VariableContext____already_unreash( self) /*VariableContext::_already_unreash*/ =  param0;
-  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;
 }
-val_t control_flow___VariableContext___set_variables(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 126, LOCATE_control_flow___VariableContext___set_variables};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  tracehead = trace.prev;
-  return ATTR_control_flow___VariableContext____set_variables( self) /*VariableContext::_set_variables*/;
+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];
 }
-val_t control_flow___VariableContext___is_set(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 129, LOCATE_control_flow___VariableContext___is_set};
-  val_t variable[4];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Local variable */
-  variable[1] =  param0;
-  /* Register variable[2]: Method return value and escape marker */
-  /* Register variable[3]: Result */
-  variable[3] = ATTR_control_flow___VariableContext____set_variables(variable[0]) /*VariableContext::_set_variables*/;
-  /* Register variable[3]: Result */
-  variable[3] = CALL_abstract_collection___Collection___has(variable[3])(variable[3],  variable[1] /*v*/) /*HashSet::has*/;
-  variable[2] = variable[3];
-  goto return_label23;
-  return_label23: while(false);
-  tracehead = trace.prev;
-  return variable[2];
+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___VariableContext___merge(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 135, LOCATE_control_flow___VariableContext___merge};
-  val_t variable[9];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Local variable */
-  variable[1] =  param0;
-  /* Register variable[2]: Method return value and escape marker */
-  /* Register variable[3]: Result */
-  variable[3] = CALL_control_flow___VariableContext___unreash( variable[1] /*ctx*/)( variable[1] /*ctx*/) /*VariableContext::unreash*/;
-  if (UNTAG_Bool(variable[3])) { /*if*/
-    CALL_control_flow___VariableContext___unreash__eq(variable[0])(variable[0],  TAG_Bool(true)) /*VariableContext::unreash=*/;
-    /* Register variable[3]: Result */
-    variable[3] = CALL_control_flow___VariableContext___already_unreash( variable[1] /*ctx*/)( variable[1] /*ctx*/) /*VariableContext::already_unreash*/;
-    if (UNTAG_Bool(variable[3])) { /*if*/
-      CALL_control_flow___VariableContext___already_unreash__eq(variable[0])(variable[0],  TAG_Bool(true)) /*VariableContext::already_unreash=*/;
-    }
-    goto return_label24;
-  }
-  /* Register variable[3]: Result */
-  variable[3] = ATTR_control_flow___VariableContext____all_variables(variable[0]) /*VariableContext::_all_variables*/;
-  /* Register variable[3]: For iterator */
-  variable[3] = CALL_abstract_collection___Collection___iterator(variable[3])(variable[3]) /*Collection::iterator*/;
-  while (true) { /*for*/
-    /* Register variable[4]: For 'is_ok' result */
-    variable[4] = CALL_abstract_collection___Iterator___is_ok(variable[3])(variable[3]) /*Iterator::is_ok*/;
-    if (!UNTAG_Bool(variable[4])) break; /*for*/
-    variable[4] = CALL_abstract_collection___Iterator___item(variable[3])(variable[3]) /*Iterator::item*/ /* Ensure var: For item*/;
-    /* Register variable[5]: Local variable */
-    variable[5] = variable[4];
-    /* Register variable[6]: Result */
-    variable[6] = CALL_control_flow___VariableContext___is_set(variable[0])(variable[0],  variable[5] /*v*/) /*VariableContext::is_set*/;
-    variable[6] =  TAG_Bool(!UNTAG_Bool(variable[6])) /* Ensure var: Left 'and' operand*/;
-    if (UNTAG_Bool(variable[6])) { /* and */
-      /* Register variable[6]: Result */
-      variable[6] = CALL_control_flow___VariableContext___is_set( variable[1] /*ctx*/)( variable[1] /*ctx*/,  variable[5] /*v*/) /*VariableContext::is_set*/;
+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);
     }
-    /* Register variable[6]: Result */
-    if (UNTAG_Bool(variable[6])) { /*if*/
-      CALL_control_flow___VariableContext___mark_is_set(variable[0])(variable[0],  variable[5] /*v*/) /*VariableContext::mark_is_set*/;
-    }
-    /* Register variable[6]: Local variable */
-    /* Register variable[7]: Result */
-    variable[7] = CALL_control_flow___VariableContext___stype(variable[0])(variable[0],  variable[5] /*v*/) /*VariableContext::stype*/;
-    variable[6] = variable[7];
-    /* Register variable[7]: Local variable */
-    /* Register variable[8]: Result */
-    variable[8] = CALL_control_flow___VariableContext___stype( variable[1] /*ctx*/)( variable[1] /*ctx*/,  variable[5] /*v*/) /*VariableContext::stype*/;
-    variable[7] = variable[8];
-    /* Register variable[8]: Result */
-    variable[8] = TAG_Bool(!UNTAG_Bool(TAG_Bool(( variable[7] /*s1*/ ==  variable[6] /*s*/) || (( variable[7] /*s1*/ != NIT_NULL) && ((CALL_kernel___Object_____eqeq( variable[7] /*s1*/)==kernel___Object_____eqeq)?(IS_EQUAL_NN( variable[7] /*s1*/, variable[6] /*s*/)):(UNTAG_Bool(CALL_kernel___Object_____eqeq( variable[7] /*s1*/)( variable[7] /*s1*/,  variable[6] /*s*/) /*Object::==*/)))))));
-    if (UNTAG_Bool(variable[8])) { /*if*/
-      CALL_control_flow___VariableContext___stype__eq(variable[0])(variable[0],  variable[5] /*v*/,  variable[7] /*s1*/) /*VariableContext::stype=*/;
+    /* ./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;
     }
-    continue_25: while(0);
-    CALL_abstract_collection___Iterator___next(variable[3])(variable[3]) /*Iterator::next*/;
+    CALL_abstract_collection___Iterator___next(fra.me.REG[2])(fra.me.REG[2]);
   }
-  break_25: while(0);
-  return_label24: while(false);
-  tracehead = trace.prev;
+  label2: while(0);
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
   return;
 }
-void control_flow___VariableContext___merge2(val_t  self, val_t  param0, val_t  param1, val_t  param2) {
-  struct trace_t trace = {NULL, NULL, 153, LOCATE_control_flow___VariableContext___merge2};
-  val_t variable[12];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Local variable */
-  variable[1] =  param0;
-  /* Register variable[2]: Local variable */
-  variable[2] =  param1;
-  /* Register variable[3]: Local variable */
-  variable[3] =  param2;
-  /* Register variable[4]: Method return value and escape marker */
-  /* Register variable[5]: Result */
-  variable[5] = CALL_control_flow___VariableContext___unreash( variable[1] /*ctx1*/)( variable[1] /*ctx1*/) /*VariableContext::unreash*/;
-  if (UNTAG_Bool(variable[5])) { /*if*/
-    CALL_control_flow___VariableContext___merge(variable[0])(variable[0],  variable[2] /*ctx2*/) /*VariableContext::merge*/;
-  } else { /*if*/
-    /* Register variable[5]: Result */
-    variable[5] = CALL_control_flow___VariableContext___unreash( variable[2] /*ctx2*/)( variable[2] /*ctx2*/) /*VariableContext::unreash*/;
-    if (UNTAG_Bool(variable[5])) { /*if*/
-      CALL_control_flow___VariableContext___merge(variable[0])(variable[0],  variable[1] /*ctx1*/) /*VariableContext::merge*/;
+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]);
     }
   }
-  /* Register variable[5]: Result */
-  variable[5] = ATTR_control_flow___VariableContext____all_variables(variable[0]) /*VariableContext::_all_variables*/;
-  /* Register variable[5]: For iterator */
-  variable[5] = CALL_abstract_collection___Collection___iterator(variable[5])(variable[5]) /*Collection::iterator*/;
-  while (true) { /*for*/
-    /* Register variable[6]: For 'is_ok' result */
-    variable[6] = CALL_abstract_collection___Iterator___is_ok(variable[5])(variable[5]) /*Iterator::is_ok*/;
-    if (!UNTAG_Bool(variable[6])) break; /*for*/
-    variable[6] = CALL_abstract_collection___Iterator___item(variable[5])(variable[5]) /*Iterator::item*/ /* Ensure var: For item*/;
-    /* Register variable[7]: Local variable */
-    variable[7] = variable[6];
-    /* Register variable[8]: Result */
-    variable[8] = CALL_control_flow___VariableContext___is_set(variable[0])(variable[0],  variable[7] /*v*/) /*VariableContext::is_set*/;
-    variable[8] =  TAG_Bool(!UNTAG_Bool(variable[8])) /* Ensure var: Left 'and' operand*/;
-    if (UNTAG_Bool(variable[8])) { /* and */
-      /* Register variable[8]: Result */
-      variable[8] = CALL_control_flow___VariableContext___is_set( variable[1] /*ctx1*/)( variable[1] /*ctx1*/,  variable[7] /*v*/) /*VariableContext::is_set*/;
-    }
-    /* Register variable[8]: Result */
-    /* Ensure var variable[8]: Left 'and' operand*/
-    if (UNTAG_Bool(variable[8])) { /* and */
-      /* Register variable[8]: Result */
-      variable[8] = CALL_control_flow___VariableContext___is_set( variable[2] /*ctx2*/)( variable[2] /*ctx2*/,  variable[7] /*v*/) /*VariableContext::is_set*/;
-    }
-    /* Register variable[8]: Result */
-    if (UNTAG_Bool(variable[8])) { /*if*/
-      CALL_control_flow___VariableContext___mark_is_set(variable[0])(variable[0],  variable[7] /*v*/) /*VariableContext::mark_is_set*/;
-    }
-    /* Register variable[8]: Local variable */
-    /* Register variable[9]: Result */
-    variable[9] = CALL_control_flow___VariableContext___stype(variable[0])(variable[0],  variable[7] /*v*/) /*VariableContext::stype*/;
-    variable[8] = variable[9];
-    /* Register variable[9]: Local variable */
-    /* Register variable[10]: Result */
-    variable[10] = CALL_control_flow___VariableContext___stype( variable[1] /*ctx1*/)( variable[1] /*ctx1*/,  variable[7] /*v*/) /*VariableContext::stype*/;
-    variable[9] = variable[10];
-    /* Register variable[10]: Local variable */
-    /* Register variable[11]: Result */
-    variable[11] = CALL_control_flow___VariableContext___stype( variable[2] /*ctx2*/)( variable[2] /*ctx2*/,  variable[7] /*v*/) /*VariableContext::stype*/;
-    variable[10] = variable[11];
-    /* Register variable[11]: Result */
-    variable[11] = TAG_Bool(( variable[9] /*s1*/ ==  variable[8] /*s*/) || (( variable[9] /*s1*/ != NIT_NULL) && ((CALL_kernel___Object_____eqeq( variable[9] /*s1*/)==kernel___Object_____eqeq)?(IS_EQUAL_NN( variable[9] /*s1*/, variable[8] /*s*/)):(UNTAG_Bool(CALL_kernel___Object_____eqeq( variable[9] /*s1*/)( variable[9] /*s1*/,  variable[8] /*s*/) /*Object::==*/)))));
-    /* Ensure var variable[11]: Left 'and' operand*/
-    if (UNTAG_Bool(variable[11])) { /* and */
-      /* Register variable[11]: Result */
-      variable[11] = TAG_Bool(( variable[10] /*s2*/ ==  variable[8] /*s*/) || (( variable[10] /*s2*/ != NIT_NULL) && ((CALL_kernel___Object_____eqeq( variable[10] /*s2*/)==kernel___Object_____eqeq)?(IS_EQUAL_NN( variable[10] /*s2*/, variable[8] /*s*/)):(UNTAG_Bool(CALL_kernel___Object_____eqeq( variable[10] /*s2*/)( variable[10] /*s2*/,  variable[8] /*s*/) /*Object::==*/)))));
-    }
-    /* Register variable[11]: Result */
-    if (UNTAG_Bool(variable[11])) { /*if*/
-    } else { /*if*/
-      /* Register variable[11]: Result */
-      variable[11] = TAG_Bool(( variable[9] /*s1*/ ==  variable[10] /*s2*/) || (( variable[9] /*s1*/ != NIT_NULL) && ((CALL_kernel___Object_____eqeq( variable[9] /*s1*/)==kernel___Object_____eqeq)?(IS_EQUAL_NN( variable[9] /*s1*/, variable[10] /*s2*/)):(UNTAG_Bool(CALL_kernel___Object_____eqeq( variable[9] /*s1*/)( variable[9] /*s1*/,  variable[10] /*s2*/) /*Object::==*/)))));
-      if (UNTAG_Bool(variable[11])) { /*if*/
-        CALL_control_flow___VariableContext___stype__eq(variable[0])(variable[0],  variable[7] /*v*/,  variable[9] /*s1*/) /*VariableContext::stype=*/;
-      } else { /*if*/
-        /* Register variable[11]: Result */
-        variable[11] = CALL_static_type___MMType_____l( variable[9] /*s1*/)( variable[9] /*s1*/,  variable[10] /*s2*/) /*MMType::<*/;
-        if (UNTAG_Bool(variable[11])) { /*if*/
-          CALL_control_flow___VariableContext___stype__eq(variable[0])(variable[0],  variable[7] /*v*/,  variable[10] /*s2*/) /*VariableContext::stype=*/;
-        } else { /*if*/
-          /* Register variable[11]: Result */
-          variable[11] = CALL_static_type___MMType_____l( variable[10] /*s2*/)( variable[10] /*s2*/,  variable[9] /*s1*/) /*MMType::<*/;
-          if (UNTAG_Bool(variable[11])) { /*if*/
-            CALL_control_flow___VariableContext___stype__eq(variable[0])(variable[0],  variable[7] /*v*/,  variable[9] /*s1*/) /*VariableContext::stype=*/;
-          } else { /*if*/
-            /* Register variable[11]: Result */
-            variable[11] = CALL_control_flow___VariableContext___stype( variable[3] /*basectx*/)( variable[3] /*basectx*/,  variable[7] /*v*/) /*VariableContext::stype*/;
-            CALL_control_flow___VariableContext___stype__eq(variable[0])(variable[0],  variable[7] /*v*/, variable[11]) /*VariableContext::stype=*/;
+  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]);
+            }
+          }
+        }
+      }
+    } else {
+      /* ./syntax//control_flow.nit:157 */
+      goto label1;
     }
-    continue_27: while(0);
-    CALL_abstract_collection___Iterator___next(variable[5])(variable[5]) /*Iterator::next*/;
+    CALL_abstract_collection___Iterator___next(fra.me.REG[4])(fra.me.REG[4]);
   }
-  break_27: while(0);
-  return_label26: while(false);
-  tracehead = trace.prev;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
   return;
 }
-void control_flow___RootVariableContext___init(val_t  self, val_t  param0, val_t  param1, int* init_table) {
-  struct trace_t trace = {NULL, NULL, 198, LOCATE_control_flow___RootVariableContext___init};
-  val_t variable[5];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Local variable */
-  variable[1] =  param0;
-  /* Register variable[2]: Local variable */
-  variable[2] =  param1;
-  if (init_table[VAL2OBJ(variable[0])->vft[INIT_TABLE_POS_RootVariableContext].i]) return;
-  /* Register variable[3]: Method return value and escape marker */
-  CALL_control_flow___VariableContext___init(variable[0])(variable[0],  variable[1] /*visitor*/,  variable[2] /*node*/, init_table /*YYY*/) /*VariableContext::init*/;
-  /* Register variable[4]: Result */
-  variable[4] = NEW_HashSet_hash___HashSet___init() /*new HashSet[Variable]*/;
-  ATTR_control_flow___VariableContext____all_variables(variable[0]) /*VariableContext::_all_variables*/ = variable[4];
-  return_label28: while(false);
-  init_table[VAL2OBJ(variable[0])->vft[INIT_TABLE_POS_RootVariableContext].i] = 1;
-  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;
 }
-val_t control_flow___SubVariableContext_____bra(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 209, LOCATE_control_flow___SubVariableContext_____bra};
-  val_t variable[4];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Local variable */
-  variable[1] =  param0;
-  /* Register variable[2]: Method return value and escape marker */
-  /* Register variable[3]: Result */
-  variable[3] = ATTR_control_flow___VariableContext____dico(variable[0]) /*VariableContext::_dico*/;
-  /* Register variable[3]: Result */
-  variable[3] = CALL_abstract_collection___MapRead___has_key(variable[3])(variable[3],  variable[1] /*s*/) /*MapRead::has_key*/;
-  if (UNTAG_Bool(variable[3])) { /*if*/
-    /* Register variable[3]: Result */
-    variable[3] = ATTR_control_flow___VariableContext____dico(variable[0]) /*VariableContext::_dico*/;
-    /* Register variable[3]: Result */
-    variable[3] = CALL_abstract_collection___MapRead_____bra(variable[3])(variable[3],  variable[1] /*s*/) /*MapRead::[]*/;
-    variable[2] = variable[3];
-    goto return_label29;
-  } else { /*if*/
-    /* Register variable[3]: Result */
-    variable[3] = CALL_control_flow___SubVariableContext___prev(variable[0])(variable[0]) /*SubVariableContext::prev*/;
-    /* Register variable[3]: Result */
-    variable[3] = CALL_control_flow___VariableContext_____bra(variable[3])(variable[3],  variable[1] /*s*/) /*VariableContext::[]*/;
-    variable[2] = variable[3];
-    goto return_label29;
-  }
-  return_label29: while(false);
-  tracehead = trace.prev;
-  return variable[2];
+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];
 }
-val_t control_flow___SubVariableContext___stype(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 218, LOCATE_control_flow___SubVariableContext___stype};
-  val_t variable[4];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Local variable */
-  variable[1] =  param0;
-  /* Register variable[2]: Method return value and escape marker */
-  /* Register variable[3]: Result */
-  variable[3] = ATTR_control_flow___VariableContext____stypes(variable[0]) /*VariableContext::_stypes*/;
-  /* Register variable[3]: Result */
-  variable[3] = CALL_abstract_collection___MapRead___has_key(variable[3])(variable[3],  variable[1] /*v*/) /*MapRead::has_key*/;
-  if (UNTAG_Bool(variable[3])) { /*if*/
-    /* Register variable[3]: Result */
-    variable[3] = ATTR_control_flow___VariableContext____stypes(variable[0]) /*VariableContext::_stypes*/;
-    /* Register variable[3]: Result */
-    variable[3] = CALL_abstract_collection___MapRead_____bra(variable[3])(variable[3],  variable[1] /*v*/) /*MapRead::[]*/;
-    variable[2] = variable[3];
-    goto return_label30;
-  } else { /*if*/
-    /* Register variable[3]: Result */
-    variable[3] = CALL_control_flow___SubVariableContext___prev(variable[0])(variable[0]) /*SubVariableContext::prev*/;
-    /* Register variable[3]: Result */
-    variable[3] = CALL_control_flow___VariableContext___stype(variable[3])(variable[3],  variable[1] /*v*/) /*VariableContext::stype*/;
-    variable[2] = variable[3];
-    goto return_label30;
-  }
-  return_label30: while(false);
-  tracehead = trace.prev;
-  return variable[2];
+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];
 }
-val_t control_flow___SubVariableContext___is_set(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 234, LOCATE_control_flow___SubVariableContext___is_set};
-  val_t variable[4];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Local variable */
-  variable[1] =  param0;
-  /* Register variable[2]: Method return value and escape marker */
-  /* Register variable[3]: Result */
-  variable[3] = ATTR_control_flow___VariableContext____set_variables(variable[0]) /*VariableContext::_set_variables*/;
-  /* Register variable[3]: Result */
-  variable[3] = CALL_abstract_collection___Collection___has(variable[3])(variable[3],  variable[1] /*v*/) /*HashSet::has*/;
-  /* Ensure var variable[3]: Left 'or' operand*/
-  if (!UNTAG_Bool(variable[3])) { /* or */
-    /* Register variable[3]: Result */
-    variable[3] = ATTR_control_flow___SubVariableContext____prev(variable[0]) /*SubVariableContext::_prev*/;
-    /* Register variable[3]: Result */
-    variable[3] = CALL_control_flow___VariableContext___is_set(variable[3])(variable[3],  variable[1] /*v*/) /*VariableContext::is_set*/;
-  }
-  /* Register variable[3]: Result */
-  variable[2] = variable[3];
-  goto return_label31;
-  return_label31: while(false);
-  tracehead = trace.prev;
-  return variable[2];
+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;
 }
-val_t control_flow___SubVariableContext___prev(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 207, LOCATE_control_flow___SubVariableContext___prev};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  tracehead = trace.prev;
-  return ATTR_control_flow___SubVariableContext____prev( self) /*SubVariableContext::_prev*/;
+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___SubVariableContext___with_prev(val_t  self, val_t  param0, val_t  param1, int* init_table) {
-  struct trace_t trace = {NULL, NULL, 227, LOCATE_control_flow___SubVariableContext___with_prev};
-  val_t variable[5];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Local variable */
-  variable[1] =  param0;
-  /* Register variable[2]: Local variable */
-  variable[2] =  param1;
-  if (init_table[VAL2OBJ(variable[0])->vft[INIT_TABLE_POS_SubVariableContext].i]) return;
-  /* Register variable[3]: Method return value and escape marker */
-  /* Register variable[4]: Result */
-  variable[4] = ATTR_control_flow___VariableContext____visitor( variable[1] /*p*/) /*VariableContext::_visitor*/;
-  CALL_control_flow___VariableContext___init(variable[0])(variable[0], variable[4],  variable[2] /*node*/, init_table /*YYY*/) /*VariableContext::init*/;
-  ATTR_control_flow___SubVariableContext____prev(variable[0]) /*SubVariableContext::_prev*/ =  variable[1] /*p*/;
-  /* Register variable[4]: Result */
-  variable[4] = ATTR_control_flow___VariableContext____all_variables( variable[1] /*p*/) /*VariableContext::_all_variables*/;
-  ATTR_control_flow___VariableContext____all_variables(variable[0]) /*VariableContext::_all_variables*/ = variable[4];
-  return_label32: while(false);
-  init_table[VAL2OBJ(variable[0])->vft[INIT_TABLE_POS_SubVariableContext].i] = 1;
-  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  self) {
-  struct trace_t trace = {NULL, NULL, 241, LOCATE_control_flow___Variable___must_be_set};
-  val_t variable[2];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Method return value and escape marker */
-  variable[1] =  TAG_Bool(false);
-  goto return_label33;
-  return_label33: while(false);
-  tracehead = trace.prev;
-  return variable[1];
+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  self) {
-  struct trace_t trace = {NULL, NULL, 246, LOCATE_control_flow___VarVariable___must_be_set};
-  val_t variable[2];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_control_flow;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Method return value and escape marker */
-  variable[1] =  TAG_Bool(true);
-  goto return_label34;
-  return_label34: while(false);
-  tracehead = trace.prev;
-  return variable[1];
+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;
 }