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

diff --git a/c_src/abstract_collection._sep.c b/c_src/abstract_collection._sep.c
index 9b1ec0b..b64027e 100644
--- a/c_src/abstract_collection._sep.c
+++ b/c_src/abstract_collection._sep.c
@@ -1,1312 +1,1805 @@
 /* This C file is generated by NIT to compile module abstract_collection. */
 #include "abstract_collection._sep.h"
-val_t abstract_collection___Collection___iterator(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 42, LOCATE_abstract_collection___Collection___iterator};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 42);
-  nit_exit(1);
-  tracehead = trace.prev;
+val_t abstract_collection___Collection___iterator(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 42;
+  fra.me.meth = LOCATE_abstract_collection___Collection___iterator;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:42 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 42);
+  stack_frame_head = fra.me.prev;
   return NIT_NULL;
 }
-val_t abstract_collection___Collection___is_empty(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 45, LOCATE_abstract_collection___Collection___is_empty};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 45);
-  nit_exit(1);
-  tracehead = trace.prev;
+void abstract_collection___Collection___iterate(val_t p0, struct stack_frame_t *closctx_param, fun_t clos_fun0){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t REGB0;
+  fun_t CREG[1];
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 45;
+  fra.me.meth = LOCATE_abstract_collection___Collection___iterate;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 2;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.closure_ctx = closctx_param;
+  fra.me.closure_funs = CREG;
+  fra.me.REG[0] = p0;
+  CREG[0] = clos_fun0;
+  /* ./../lib/standard//collection//abstract_collection.nit:49 */
+  fra.me.REG[0] = CALL_abstract_collection___Collection___iterator(fra.me.REG[0])(fra.me.REG[0]);
+  /* ./../lib/standard//collection//abstract_collection.nit:50 */
+  while(1) {
+    REGB0 = CALL_abstract_collection___Iterator___is_ok(fra.me.REG[0])(fra.me.REG[0]);
+    if (UNTAG_Bool(REGB0)) {
+      /* ./../lib/standard//collection//abstract_collection.nit:51 */
+      fra.me.REG[1] = CALL_abstract_collection___Iterator___item(fra.me.REG[0])(fra.me.REG[0]);
+      ((void (*)(struct stack_frame_t *, val_t))(CREG[0]))(closctx_param, fra.me.REG[1]);
+      if (closctx_param->has_broke) {
+        goto label1;
+      }
+      /* ./../lib/standard//collection//abstract_collection.nit:52 */
+      CALL_abstract_collection___Iterator___next(fra.me.REG[0])(fra.me.REG[0]);
+    } else {
+      /* ./../lib/standard//collection//abstract_collection.nit:50 */
+      goto label2;
+    }
+  }
+  label2: while(0);
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return;
+}
+val_t abstract_collection___Collection___is_empty(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 56;
+  fra.me.meth = LOCATE_abstract_collection___Collection___is_empty;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:56 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 56);
+  stack_frame_head = fra.me.prev;
   return NIT_NULL;
 }
-val_t abstract_collection___Collection___length(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 48, LOCATE_abstract_collection___Collection___length};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 48);
-  nit_exit(1);
-  tracehead = trace.prev;
+val_t abstract_collection___Collection___length(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 59;
+  fra.me.meth = LOCATE_abstract_collection___Collection___length;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:59 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 59);
+  stack_frame_head = fra.me.prev;
   return NIT_NULL;
 }
-val_t abstract_collection___Collection___has(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 51, LOCATE_abstract_collection___Collection___has};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 51);
-  nit_exit(1);
-  tracehead = trace.prev;
+val_t abstract_collection___Collection___has(val_t p0, val_t p1){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 62;
+  fra.me.meth = LOCATE_abstract_collection___Collection___has;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:62 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 62);
+  stack_frame_head = fra.me.prev;
   return NIT_NULL;
 }
-val_t abstract_collection___Collection___has_only(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 55, LOCATE_abstract_collection___Collection___has_only};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 55);
-  nit_exit(1);
-  tracehead = trace.prev;
+val_t abstract_collection___Collection___has_only(val_t p0, val_t p1){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 66;
+  fra.me.meth = LOCATE_abstract_collection___Collection___has_only;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:66 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 66);
+  stack_frame_head = fra.me.prev;
   return NIT_NULL;
 }
-val_t abstract_collection___Collection___count(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 60, LOCATE_abstract_collection___Collection___count};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 60);
-  nit_exit(1);
-  tracehead = trace.prev;
+val_t abstract_collection___Collection___count(val_t p0, val_t p1){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 71;
+  fra.me.meth = LOCATE_abstract_collection___Collection___count;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:71 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 71);
+  stack_frame_head = fra.me.prev;
   return NIT_NULL;
 }
-val_t abstract_collection___Collection___first(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 64, LOCATE_abstract_collection___Collection___first};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 64);
-  nit_exit(1);
-  tracehead = trace.prev;
+val_t abstract_collection___Collection___first(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 75;
+  fra.me.meth = LOCATE_abstract_collection___Collection___first;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:75 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 75);
+  stack_frame_head = fra.me.prev;
   return NIT_NULL;
 }
-val_t abstract_collection___NaiveCollection___is_empty(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 72, LOCATE_abstract_collection___NaiveCollection___is_empty};
-  val_t variable[3];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Method return value and escape marker */
-  /* Register variable[2]: Result */
-  variable[2] = CALL_abstract_collection___Collection___length(variable[0])(variable[0]) /*NaiveCollection::length*/;
-  /* Register variable[2]: Result */
-  variable[2] = TAG_Bool((variable[2])==( TAG_Int(0)));
-  variable[1] = variable[2];
-  goto return_label0;
-  return_label0: while(false);
-  tracehead = trace.prev;
-  return variable[1];
-}
-val_t abstract_collection___NaiveCollection___length(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 74, LOCATE_abstract_collection___NaiveCollection___length};
-  val_t variable[6];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Method return value and escape marker */
-  /* Register variable[2]: Local variable */
-  variable[2] =  TAG_Int(0);
-  /* Register variable[3]: For iterator */
-  variable[3] = CALL_abstract_collection___Collection___iterator(variable[0])(variable[0]) /*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];
-    variable[2] = TAG_Int(UNTAG_Int(variable[2])+UNTAG_Int( variable[2] /*nb*/)) /*nb*/;
-    continue_2: while(0);
-    CALL_abstract_collection___Iterator___next(variable[3])(variable[3]) /*Iterator::next*/;
+val_t abstract_collection___NaiveCollection___is_empty(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t REGB2;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 83;
+  fra.me.meth = LOCATE_abstract_collection___NaiveCollection___is_empty;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//collection//abstract_collection.nit:83 */
+  REGB0 = CALL_abstract_collection___Collection___length(fra.me.REG[0])(fra.me.REG[0]);
+  REGB1 = TAG_Int(0);
+  REGB2 = TAG_Bool(IS_EQUAL_OO(REGB0,REGB1));
+  if (UNTAG_Bool(REGB2)) {
+  } else {
+    /* ./../lib/standard//kernel.nit:207 */
+    REGB1 = TAG_Bool((REGB0)==(REGB1));
+    /* ./../lib/standard//collection//abstract_collection.nit:83 */
+    REGB2 = REGB1;
+  }
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB2;
+}
+val_t abstract_collection___NaiveCollection___length(val_t p0){
+  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_abstract_collection;
+  fra.me.line = 85;
+  fra.me.meth = LOCATE_abstract_collection___NaiveCollection___length;
+  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;
+  /* ./../lib/standard//collection//abstract_collection.nit:87 */
+  REGB0 = TAG_Int(0);
+  fra.me.REG[1] = REGB0;
+  CALL_abstract_collection___Collection___iterate(fra.me.REG[0])(fra.me.REG[0], (&(fra.me)), ((fun_t)OC_abstract_collection___NaiveCollection___length_1));
+  /* ./../lib/standard//collection//abstract_collection.nit:89 */
+  REGB0 = fra.me.REG[1];
+  goto label2;
+  label2: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
+}
+  void OC_abstract_collection___NaiveCollection___length_1(struct stack_frame_t *closctx, val_t p0, struct stack_frame_t *closctx_param, fun_t clos_fun0){
+    struct {struct stack_frame_t me;} fra;
+    val_t REGB0;
+    fun_t CREG[1];
+    val_t tmp;
+    /* ./../lib/standard//collection//abstract_collection.nit:88 */
+    fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+    fra.me.file = LOCATE_abstract_collection;
+    fra.me.line = 0;
+    fra.me.meth = LOCATE_abstract_collection___NaiveCollection___length;
+    fra.me.has_broke = 0;
+    fra.me.REG_size = 1;
+    fra.me.REG[0] = NIT_NULL;
+    fra.me.closure_ctx = closctx_param;
+    fra.me.closure_funs = CREG;
+    fra.me.REG[0] = p0;
+    CREG[0] = clos_fun0;
+    /* ./../lib/standard//kernel.nit:215 */
+    REGB0 = TAG_Int(UNTAG_Int(closctx->REG[1])+UNTAG_Int(closctx->REG[1]));
+    /* ./../lib/standard//collection//abstract_collection.nit:88 */
+    closctx->REG[1] = REGB0;
+    stack_frame_head = fra.me.prev;
+    return;
+  }
+val_t abstract_collection___NaiveCollection___has(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_abstract_collection;
+  fra.me.line = 92;
+  fra.me.meth = LOCATE_abstract_collection___NaiveCollection___has;
+  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;
+  CALL_abstract_collection___Collection___iterate(fra.me.REG[0])(fra.me.REG[0], (&(fra.me)), ((fun_t)OC_abstract_collection___NaiveCollection___has_1));
+  switch ((&(fra.me))->has_broke) {
+    case 0: break;
+    case 1: (&(fra.me))->has_broke = 0; goto label3;
   }
-  break_2: while(0);
-  variable[1] =  variable[2] /*nb*/;
-  goto return_label1;
-  return_label1: while(false);
-  tracehead = trace.prev;
-  return variable[1];
-}
-val_t abstract_collection___NaiveCollection___has(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 81, LOCATE_abstract_collection___NaiveCollection___has};
-  val_t variable[7];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* 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]: For iterator */
-  variable[3] = CALL_abstract_collection___Collection___iterator(variable[0])(variable[0]) /*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] = TAG_Bool(( variable[5] /*i*/ ==  variable[1] /*item*/) || (( variable[5] /*i*/ != NIT_NULL) && ((CALL_kernel___Object_____eqeq( variable[5] /*i*/)==kernel___Object_____eqeq)?(IS_EQUAL_NN( variable[5] /*i*/, variable[1] /*item*/)):(UNTAG_Bool(CALL_kernel___Object_____eqeq( variable[5] /*i*/)( variable[5] /*i*/,  variable[1] /*item*/) /*Object::==*/)))));
-    if (UNTAG_Bool(variable[6])) { /*if*/
-      variable[2] =  TAG_Bool(true);
-      goto return_label3;
+  /* ./../lib/standard//collection//abstract_collection.nit:95 */
+  REGB0 = TAG_Bool(false);
+  fra.me.REG[0] = REGB0;
+  goto label3;
+  label3: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
+}
+  void OC_abstract_collection___NaiveCollection___has_1(struct stack_frame_t *closctx, val_t p0, struct stack_frame_t *closctx_param, fun_t clos_fun0){
+    struct {struct stack_frame_t me;} fra;
+    val_t REGB0;
+    val_t REGB1;
+    fun_t CREG[1];
+    val_t tmp;
+    /* ./../lib/standard//collection//abstract_collection.nit:94 */
+    fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+    fra.me.file = LOCATE_abstract_collection;
+    fra.me.line = 0;
+    fra.me.meth = LOCATE_abstract_collection___NaiveCollection___has;
+    fra.me.has_broke = 0;
+    fra.me.REG_size = 1;
+    fra.me.REG[0] = NIT_NULL;
+    fra.me.closure_ctx = closctx_param;
+    fra.me.closure_funs = CREG;
+    fra.me.REG[0] = p0;
+    CREG[0] = clos_fun0;
+    REGB0 = TAG_Bool(IS_EQUAL_NN(fra.me.REG[0],closctx->REG[1]));
+    if (UNTAG_Bool(REGB0)) {
+    } else {
+      REGB1 = TAG_Bool(fra.me.REG[0]==NIT_NULL);
+      if (UNTAG_Bool(REGB1)) {
+        REGB1 = TAG_Bool(false);
+        REGB0 = REGB1;
+      } else {
+        REGB1 = CALL_kernel___Object_____eqeq(fra.me.REG[0])(fra.me.REG[0], closctx->REG[1]);
+        REGB0 = REGB1;
+      }
     }
-    continue_4: while(0);
-    CALL_abstract_collection___Iterator___next(variable[3])(variable[3]) /*Iterator::next*/;
+    if (UNTAG_Bool(REGB0)) {
+      REGB0 = TAG_Bool(true);
+      closctx->REG[0] = REGB0;
+      closctx->has_broke = 1;
+      goto label2;
+    }
+    label2: while(0);
+    stack_frame_head = fra.me.prev;
+    return;
+  }
+val_t abstract_collection___NaiveCollection___has_only(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_abstract_collection;
+  fra.me.line = 98;
+  fra.me.meth = LOCATE_abstract_collection___NaiveCollection___has_only;
+  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;
+  CALL_abstract_collection___Collection___iterate(fra.me.REG[0])(fra.me.REG[0], (&(fra.me)), ((fun_t)OC_abstract_collection___NaiveCollection___has_only_1));
+  switch ((&(fra.me))->has_broke) {
+    case 0: break;
+    case 1: (&(fra.me))->has_broke = 0; goto label3;
   }
-  break_4: while(0);
-  variable[2] =  TAG_Bool(false);
-  goto return_label3;
-  return_label3: while(false);
-  tracehead = trace.prev;
-  return variable[2];
-}
-val_t abstract_collection___NaiveCollection___has_only(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 87, LOCATE_abstract_collection___NaiveCollection___has_only};
-  val_t variable[7];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* 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]: For iterator */
-  variable[3] = CALL_abstract_collection___Collection___iterator(variable[0])(variable[0]) /*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] = TAG_Bool(!UNTAG_Bool(TAG_Bool(( variable[5] /*i*/ ==  variable[1] /*item*/) || (( variable[5] /*i*/ != NIT_NULL) && ((CALL_kernel___Object_____eqeq( variable[5] /*i*/)==kernel___Object_____eqeq)?(IS_EQUAL_NN( variable[5] /*i*/, variable[1] /*item*/)):(UNTAG_Bool(CALL_kernel___Object_____eqeq( variable[5] /*i*/)( variable[5] /*i*/,  variable[1] /*item*/) /*Object::==*/)))))));
-    if (UNTAG_Bool(variable[6])) { /*if*/
-      variable[2] =  TAG_Bool(false);
-      goto return_label5;
+  /* ./../lib/standard//collection//abstract_collection.nit:101 */
+  REGB0 = TAG_Bool(true);
+  fra.me.REG[0] = REGB0;
+  goto label3;
+  label3: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
+}
+  void OC_abstract_collection___NaiveCollection___has_only_1(struct stack_frame_t *closctx, val_t p0, struct stack_frame_t *closctx_param, fun_t clos_fun0){
+    struct {struct stack_frame_t me;} fra;
+    val_t REGB0;
+    val_t REGB1;
+    fun_t CREG[1];
+    val_t tmp;
+    /* ./../lib/standard//collection//abstract_collection.nit:100 */
+    fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+    fra.me.file = LOCATE_abstract_collection;
+    fra.me.line = 0;
+    fra.me.meth = LOCATE_abstract_collection___NaiveCollection___has_only;
+    fra.me.has_broke = 0;
+    fra.me.REG_size = 1;
+    fra.me.REG[0] = NIT_NULL;
+    fra.me.closure_ctx = closctx_param;
+    fra.me.closure_funs = CREG;
+    fra.me.REG[0] = p0;
+    CREG[0] = clos_fun0;
+    REGB0 = TAG_Bool(IS_EQUAL_NN(fra.me.REG[0],closctx->REG[1]));
+    if (UNTAG_Bool(REGB0)) {
+    } else {
+      REGB1 = TAG_Bool(fra.me.REG[0]==NIT_NULL);
+      if (UNTAG_Bool(REGB1)) {
+        REGB1 = TAG_Bool(false);
+        REGB0 = REGB1;
+      } else {
+        REGB1 = CALL_kernel___Object_____eqeq(fra.me.REG[0])(fra.me.REG[0], closctx->REG[1]);
+        REGB0 = REGB1;
+      }
+    }
+    REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
+    if (UNTAG_Bool(REGB0)) {
+      REGB0 = TAG_Bool(false);
+      closctx->REG[0] = REGB0;
+      closctx->has_broke = 1;
+      goto label2;
     }
-    continue_6: while(0);
-    CALL_abstract_collection___Iterator___next(variable[3])(variable[3]) /*Iterator::next*/;
+    label2: while(0);
+    stack_frame_head = fra.me.prev;
+    return;
   }
-  break_6: while(0);
-  variable[2] =  TAG_Bool(true);
-  goto return_label5;
-  return_label5: while(false);
-  tracehead = trace.prev;
-  return variable[2];
-}
-val_t abstract_collection___NaiveCollection___count(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 93, LOCATE_abstract_collection___NaiveCollection___count};
-  val_t variable[8];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* 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]: Local variable */
-  variable[3] =  TAG_Int(0);
-  /* Register variable[4]: For iterator */
-  variable[4] = CALL_abstract_collection___Collection___iterator(variable[0])(variable[0]) /*Collection::iterator*/;
-  while (true) { /*for*/
-    /* Register variable[5]: For 'is_ok' result */
-    variable[5] = CALL_abstract_collection___Iterator___is_ok(variable[4])(variable[4]) /*Iterator::is_ok*/;
-    if (!UNTAG_Bool(variable[5])) break; /*for*/
-    variable[5] = CALL_abstract_collection___Iterator___item(variable[4])(variable[4]) /*Iterator::item*/ /* Ensure var: For item*/;
-    /* Register variable[6]: Local variable */
-    variable[6] = variable[5];
-    /* Register variable[7]: Result */
-    variable[7] = TAG_Bool(( variable[6] /*i*/ ==  variable[1] /*item*/) || (( variable[6] /*i*/ != NIT_NULL) && ((CALL_kernel___Object_____eqeq( variable[6] /*i*/)==kernel___Object_____eqeq)?(IS_EQUAL_NN( variable[6] /*i*/, variable[1] /*item*/)):(UNTAG_Bool(CALL_kernel___Object_____eqeq( variable[6] /*i*/)( variable[6] /*i*/,  variable[1] /*item*/) /*Object::==*/)))));
-    if (UNTAG_Bool(variable[7])) { /*if*/
-      variable[3] = TAG_Int(UNTAG_Int(variable[3])+UNTAG_Int( TAG_Int(1))) /*nb*/;
+val_t abstract_collection___NaiveCollection___count(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_abstract_collection;
+  fra.me.line = 104;
+  fra.me.meth = LOCATE_abstract_collection___NaiveCollection___count;
+  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;
+  /* ./../lib/standard//collection//abstract_collection.nit:106 */
+  REGB0 = TAG_Int(0);
+  fra.me.REG[2] = REGB0;
+  CALL_abstract_collection___Collection___iterate(fra.me.REG[0])(fra.me.REG[0], (&(fra.me)), ((fun_t)OC_abstract_collection___NaiveCollection___count_1));
+  /* ./../lib/standard//collection//abstract_collection.nit:108 */
+  REGB0 = fra.me.REG[2];
+  goto label2;
+  label2: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
+}
+  void OC_abstract_collection___NaiveCollection___count_1(struct stack_frame_t *closctx, val_t p0, struct stack_frame_t *closctx_param, fun_t clos_fun0){
+    struct {struct stack_frame_t me;} fra;
+    val_t REGB0;
+    val_t REGB1;
+    fun_t CREG[1];
+    val_t tmp;
+    /* ./../lib/standard//collection//abstract_collection.nit:107 */
+    fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+    fra.me.file = LOCATE_abstract_collection;
+    fra.me.line = 0;
+    fra.me.meth = LOCATE_abstract_collection___NaiveCollection___count;
+    fra.me.has_broke = 0;
+    fra.me.REG_size = 1;
+    fra.me.REG[0] = NIT_NULL;
+    fra.me.closure_ctx = closctx_param;
+    fra.me.closure_funs = CREG;
+    fra.me.REG[0] = p0;
+    CREG[0] = clos_fun0;
+    REGB0 = TAG_Bool(IS_EQUAL_NN(fra.me.REG[0],closctx->REG[1]));
+    if (UNTAG_Bool(REGB0)) {
+    } else {
+      REGB1 = TAG_Bool(fra.me.REG[0]==NIT_NULL);
+      if (UNTAG_Bool(REGB1)) {
+        REGB1 = TAG_Bool(false);
+        REGB0 = REGB1;
+      } else {
+        REGB1 = CALL_kernel___Object_____eqeq(fra.me.REG[0])(fra.me.REG[0], closctx->REG[1]);
+        REGB0 = REGB1;
+      }
     }
-    continue_8: while(0);
-    CALL_abstract_collection___Iterator___next(variable[4])(variable[4]) /*Iterator::next*/;
+    if (UNTAG_Bool(REGB0)) {
+      REGB0 = TAG_Int(1);
+      /* ./../lib/standard//kernel.nit:215 */
+      REGB0 = TAG_Int(UNTAG_Int(closctx->REG[2])+UNTAG_Int(REGB0));
+      /* ./../lib/standard//collection//abstract_collection.nit:107 */
+      closctx->REG[2] = REGB0;
+    }
+    stack_frame_head = fra.me.prev;
+    return;
+  }
+val_t abstract_collection___NaiveCollection___first(val_t p0){
+  struct {struct stack_frame_t me;} 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_abstract_collection;
+  fra.me.line = 111;
+  fra.me.meth = LOCATE_abstract_collection___NaiveCollection___first;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//collection//abstract_collection.nit:113 */
+  REGB0 = CALL_abstract_collection___Collection___length(fra.me.REG[0])(fra.me.REG[0]);
+  REGB1 = TAG_Int(0);
+  /* ./../lib/standard//kernel.nit:214 */
+  REGB1 = TAG_Bool(UNTAG_Int(REGB0)>UNTAG_Int(REGB1));
+  /* ./../lib/standard//collection//abstract_collection.nit:113 */
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Assert failed", NULL, LOCATE_abstract_collection, 113);
   }
-  break_8: while(0);
-  variable[2] =  variable[3] /*nb*/;
-  goto return_label7;
-  return_label7: while(false);
-  tracehead = trace.prev;
-  return variable[2];
-}
-val_t abstract_collection___NaiveCollection___first(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 100, LOCATE_abstract_collection___NaiveCollection___first};
-  val_t variable[3];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Method return value and escape marker */
-  /* Register variable[2]: Result */
-  variable[2] = CALL_abstract_collection___Collection___length(variable[0])(variable[0]) /*NaiveCollection::length*/;
-  /* Register variable[2]: Result */
-  variable[2] = TAG_Bool(UNTAG_Int(variable[2])>UNTAG_Int( TAG_Int(0)));
-  if (!UNTAG_Bool(variable[2])) { fprintf(stderr, "Assert%s failed", ""); fprintf(stderr, " in %s (%s:%d)\n", LOCATE_abstract_collection___NaiveCollection___first, LOCATE_abstract_collection, 102); nit_exit(1);}
-  /* Register variable[2]: Result */
-  variable[2] = CALL_abstract_collection___Collection___iterator(variable[0])(variable[0]) /*Collection::iterator*/;
-  /* Register variable[2]: Result */
-  variable[2] = CALL_abstract_collection___Iterator___item(variable[2])(variable[2]) /*Iterator::item*/;
-  variable[1] = variable[2];
-  goto return_label9;
-  return_label9: while(false);
-  tracehead = trace.prev;
-  return variable[1];
-}
-val_t abstract_collection___Iterator___item(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 110, LOCATE_abstract_collection___Iterator___item};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 110);
-  nit_exit(1);
-  tracehead = trace.prev;
+  /* ./../lib/standard//collection//abstract_collection.nit:114 */
+  fra.me.REG[0] = CALL_abstract_collection___Collection___iterator(fra.me.REG[0])(fra.me.REG[0]);
+  fra.me.REG[0] = CALL_abstract_collection___Iterator___item(fra.me.REG[0])(fra.me.REG[0]);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
+}
+val_t abstract_collection___Iterator___item(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 121;
+  fra.me.meth = LOCATE_abstract_collection___Iterator___item;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:121 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 121);
+  stack_frame_head = fra.me.prev;
   return NIT_NULL;
 }
-void abstract_collection___Iterator___next(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 114, LOCATE_abstract_collection___Iterator___next};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 114);
-  nit_exit(1);
-  tracehead = trace.prev;
+void abstract_collection___Iterator___next(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 125;
+  fra.me.meth = LOCATE_abstract_collection___Iterator___next;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:125 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 125);
+  stack_frame_head = fra.me.prev;
   return;
 }
-val_t abstract_collection___Iterator___is_ok(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 118, LOCATE_abstract_collection___Iterator___is_ok};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 118);
-  nit_exit(1);
-  tracehead = trace.prev;
+val_t abstract_collection___Iterator___is_ok(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 129;
+  fra.me.meth = LOCATE_abstract_collection___Iterator___is_ok;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:129 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 129);
+  stack_frame_head = fra.me.prev;
   return NIT_NULL;
 }
-val_t abstract_collection___Container___iterator(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 145, LOCATE_abstract_collection___Container___iterator};
-  val_t variable[3];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Method return value and escape marker */
-  /* Register variable[2]: Result */
-  variable[2] = NEW_ContainerIterator_abstract_collection___ContainerIterator___init(variable[0]) /*new ContainerIterator[E]*/;
-  variable[1] = variable[2];
-  goto return_label10;
-  return_label10: while(false);
-  tracehead = trace.prev;
-  return variable[1];
-}
-val_t abstract_collection___Container___is_empty(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 128, LOCATE_abstract_collection___Container___is_empty};
-  val_t variable[2];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Method return value and escape marker */
-  variable[1] =  TAG_Bool(false);
-  goto return_label11;
-  return_label11: while(false);
-  tracehead = trace.prev;
-  return variable[1];
-}
-val_t abstract_collection___Container___length(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 130, LOCATE_abstract_collection___Container___length};
-  val_t variable[2];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Method return value and escape marker */
-  variable[1] =  TAG_Int(1);
-  goto return_label12;
-  return_label12: while(false);
-  tracehead = trace.prev;
-  return variable[1];
-}
-val_t abstract_collection___Container___has(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 132, LOCATE_abstract_collection___Container___has};
-  val_t variable[4];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* 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_abstract_collection___Container____item(variable[0]) /*Container::_item*/;
-  /* Register variable[3]: Result */
-  variable[3] = TAG_Bool((variable[3] ==  variable[1] /*an_item*/) || ((variable[3] != NIT_NULL) && ((CALL_kernel___Object_____eqeq(variable[3])==kernel___Object_____eqeq)?(IS_EQUAL_NN(variable[3], variable[1] /*an_item*/)):(UNTAG_Bool(CALL_kernel___Object_____eqeq(variable[3])(variable[3],  variable[1] /*an_item*/) /*Object::==*/)))));
-  variable[2] = variable[3];
-  goto return_label13;
-  return_label13: while(false);
-  tracehead = trace.prev;
-  return variable[2];
-}
-val_t abstract_collection___Container___has_only(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 134, LOCATE_abstract_collection___Container___has_only};
-  val_t variable[4];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* 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_abstract_collection___Container____item(variable[0]) /*Container::_item*/;
-  /* Register variable[3]: Result */
-  variable[3] = TAG_Bool((variable[3] ==  variable[1] /*an_item*/) || ((variable[3] != NIT_NULL) && ((CALL_kernel___Object_____eqeq(variable[3])==kernel___Object_____eqeq)?(IS_EQUAL_NN(variable[3], variable[1] /*an_item*/)):(UNTAG_Bool(CALL_kernel___Object_____eqeq(variable[3])(variable[3],  variable[1] /*an_item*/) /*Object::==*/)))));
-  variable[2] = variable[3];
-  goto return_label14;
-  return_label14: while(false);
-  tracehead = trace.prev;
-  return variable[2];
-}
-val_t abstract_collection___Container___count(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 136, LOCATE_abstract_collection___Container___count};
-  val_t variable[4];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* 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_abstract_collection___Container____item(variable[0]) /*Container::_item*/;
-  /* Register variable[3]: Result */
-  variable[3] = TAG_Bool((variable[3] ==  variable[1] /*an_item*/) || ((variable[3] != NIT_NULL) && ((CALL_kernel___Object_____eqeq(variable[3])==kernel___Object_____eqeq)?(IS_EQUAL_NN(variable[3], variable[1] /*an_item*/)):(UNTAG_Bool(CALL_kernel___Object_____eqeq(variable[3])(variable[3],  variable[1] /*an_item*/) /*Object::==*/)))));
-  if (UNTAG_Bool(variable[3])) { /*if*/
-    variable[2] =  TAG_Int(1);
-    goto return_label15;
-  } else { /*if*/
-    variable[2] =  TAG_Int(0);
-    goto return_label15;
+val_t abstract_collection___Container___first(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 137;
+  fra.me.meth = LOCATE_abstract_collection___Container___first;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//collection//abstract_collection.nit:137 */
+  fra.me.REG[0] = ATTR_abstract_collection___Container____item(fra.me.REG[0]);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
+}
+val_t abstract_collection___Container___is_empty(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_abstract_collection;
+  fra.me.line = 139;
+  fra.me.meth = LOCATE_abstract_collection___Container___is_empty;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//collection//abstract_collection.nit:139 */
+  REGB0 = TAG_Bool(false);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
+}
+val_t abstract_collection___Container___length(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_abstract_collection;
+  fra.me.line = 141;
+  fra.me.meth = LOCATE_abstract_collection___Container___length;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//collection//abstract_collection.nit:141 */
+  REGB0 = TAG_Int(1);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
+}
+val_t abstract_collection___Container___has(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} 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_abstract_collection;
+  fra.me.line = 143;
+  fra.me.meth = LOCATE_abstract_collection___Container___has;
+  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;
+  /* ./../lib/standard//collection//abstract_collection.nit:143 */
+  fra.me.REG[0] = ATTR_abstract_collection___Container____item(fra.me.REG[0]);
+  REGB0 = TAG_Bool(IS_EQUAL_NN(fra.me.REG[0],fra.me.REG[1]));
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    REGB1 = TAG_Bool(fra.me.REG[0]==NIT_NULL);
+    if (UNTAG_Bool(REGB1)) {
+      REGB1 = TAG_Bool(false);
+      REGB0 = REGB1;
+    } else {
+      REGB1 = CALL_kernel___Object_____eqeq(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
+      REGB0 = REGB1;
+    }
   }
-  return_label15: while(false);
-  tracehead = trace.prev;
-  return variable[2];
-}
-val_t abstract_collection___Container___first(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 126, LOCATE_abstract_collection___Container___first};
-  val_t variable[3];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Method return value and escape marker */
-  /* Register variable[2]: Result */
-  variable[2] = ATTR_abstract_collection___Container____item(variable[0]) /*Container::_item*/;
-  variable[1] = variable[2];
-  goto return_label16;
-  return_label16: while(false);
-  tracehead = trace.prev;
-  return variable[1];
-}
-void abstract_collection___Container___init(val_t  self, val_t  param0, int* init_table) {
-  struct trace_t trace = {NULL, NULL, 147, LOCATE_abstract_collection___Container___init};
-  val_t variable[3];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Local variable */
-  variable[1] =  param0;
-  if (init_table[VAL2OBJ(variable[0])->vft[INIT_TABLE_POS_Container].i]) return;
-  /* Register variable[2]: Method return value and escape marker */
-  ATTR_abstract_collection___Container____item(variable[0]) /*Container::_item*/ =  variable[1] /*e*/;
-  return_label17: while(false);
-  init_table[VAL2OBJ(variable[0])->vft[INIT_TABLE_POS_Container].i] = 1;
-  tracehead = trace.prev;
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
+}
+val_t abstract_collection___Container___has_only(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} 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_abstract_collection;
+  fra.me.line = 145;
+  fra.me.meth = LOCATE_abstract_collection___Container___has_only;
+  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;
+  /* ./../lib/standard//collection//abstract_collection.nit:145 */
+  fra.me.REG[0] = ATTR_abstract_collection___Container____item(fra.me.REG[0]);
+  REGB0 = TAG_Bool(IS_EQUAL_NN(fra.me.REG[0],fra.me.REG[1]));
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    REGB1 = TAG_Bool(fra.me.REG[0]==NIT_NULL);
+    if (UNTAG_Bool(REGB1)) {
+      REGB1 = TAG_Bool(false);
+      REGB0 = REGB1;
+    } else {
+      REGB1 = CALL_kernel___Object_____eqeq(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 abstract_collection___Container___count(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} 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_abstract_collection;
+  fra.me.line = 147;
+  fra.me.meth = LOCATE_abstract_collection___Container___count;
+  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;
+  /* ./../lib/standard//collection//abstract_collection.nit:149 */
+  fra.me.REG[0] = ATTR_abstract_collection___Container____item(fra.me.REG[0]);
+  REGB0 = TAG_Bool(IS_EQUAL_NN(fra.me.REG[0],fra.me.REG[1]));
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    REGB1 = TAG_Bool(fra.me.REG[0]==NIT_NULL);
+    if (UNTAG_Bool(REGB1)) {
+      REGB1 = TAG_Bool(false);
+      REGB0 = REGB1;
+    } else {
+      REGB1 = CALL_kernel___Object_____eqeq(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
+      REGB0 = REGB1;
+    }
+  }
+  if (UNTAG_Bool(REGB0)) {
+    /* ./../lib/standard//collection//abstract_collection.nit:150 */
+    REGB0 = TAG_Int(1);
+    goto label1;
+  } else {
+    /* ./../lib/standard//collection//abstract_collection.nit:152 */
+    REGB1 = TAG_Int(0);
+    REGB0 = REGB1;
+    goto label1;
+  }
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
+}
+val_t abstract_collection___Container___iterator(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 156;
+  fra.me.meth = LOCATE_abstract_collection___Container___iterator;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//collection//abstract_collection.nit:156 */
+  fra.me.REG[0] = NEW_ContainerIterator_abstract_collection___ContainerIterator___init(fra.me.REG[0]);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
+}
+void abstract_collection___Container___init(val_t p0, val_t p1, int* init_table){
+  int itpos0 = VAL2OBJ(p0)->vft[INIT_TABLE_POS_Container].i;
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t tmp;
+  if (init_table[itpos0]) return;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 158;
+  fra.me.meth = LOCATE_abstract_collection___Container___init;
+  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;
+  /* ./../lib/standard//collection//abstract_collection.nit:159 */
+  ATTR_abstract_collection___Container____item(fra.me.REG[0]) = fra.me.REG[1];
+  stack_frame_head = fra.me.prev;
+  init_table[itpos0] = 1;
   return;
 }
-val_t abstract_collection___Container___item(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 150, LOCATE_abstract_collection___Container___item};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  tracehead = trace.prev;
-  return ATTR_abstract_collection___Container____item( self) /*Container::_item*/;
-}
-void abstract_collection___Container___item__eq(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 150, LOCATE_abstract_collection___Container___item__eq};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  ATTR_abstract_collection___Container____item( self) /*Container::_item*/ =  param0;
-  tracehead = trace.prev;
+val_t abstract_collection___Container___item(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 161;
+  fra.me.meth = LOCATE_abstract_collection___Container___item;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//collection//abstract_collection.nit:161 */
+  fra.me.REG[0] = ATTR_abstract_collection___Container____item(fra.me.REG[0]);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
+}
+void abstract_collection___Container___item__eq(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_abstract_collection;
+  fra.me.line = 161;
+  fra.me.meth = LOCATE_abstract_collection___Container___item__eq;
+  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;
+  /* ./../lib/standard//collection//abstract_collection.nit:161 */
+  ATTR_abstract_collection___Container____item(fra.me.REG[0]) = fra.me.REG[1];
+  stack_frame_head = fra.me.prev;
   return;
 }
-val_t abstract_collection___ContainerIterator___item(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 157, LOCATE_abstract_collection___ContainerIterator___item};
-  val_t variable[3];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Method return value and escape marker */
-  /* Register variable[2]: Result */
-  variable[2] = ATTR_abstract_collection___ContainerIterator____container(variable[0]) /*ContainerIterator::_container*/;
-  /* Register variable[2]: Result */
-  variable[2] = CALL_abstract_collection___Container___item(variable[2])(variable[2]) /*Container::item*/;
-  variable[1] = variable[2];
-  goto return_label18;
-  return_label18: while(false);
-  tracehead = trace.prev;
-  return variable[1];
-}
-void abstract_collection___ContainerIterator___next(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 159, LOCATE_abstract_collection___ContainerIterator___next};
-  val_t variable[2];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Method return value and escape marker */
-  ATTR_abstract_collection___ContainerIterator____is_ok(variable[0]) /*ContainerIterator::_is_ok*/ =  TAG_Bool(false);
-  return_label19: while(false);
-  tracehead = trace.prev;
+val_t abstract_collection___ContainerIterator___item(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_abstract_collection;
+  fra.me.line = 168;
+  fra.me.meth = LOCATE_abstract_collection___ContainerIterator___item;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//collection//abstract_collection.nit:168 */
+  REGB0 = TAG_Bool(ATTR_abstract_collection___ContainerIterator____container(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_container", LOCATE_abstract_collection, 168);
+  }
+  fra.me.REG[0] = ATTR_abstract_collection___ContainerIterator____container(fra.me.REG[0]);
+  fra.me.REG[0] = CALL_abstract_collection___Container___item(fra.me.REG[0])(fra.me.REG[0]);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
+}
+void abstract_collection___ContainerIterator___next(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_abstract_collection;
+  fra.me.line = 170;
+  fra.me.meth = LOCATE_abstract_collection___ContainerIterator___next;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//collection//abstract_collection.nit:170 */
+  REGB0 = TAG_Bool(false);
+  ATTR_abstract_collection___ContainerIterator____is_ok(fra.me.REG[0]) = REGB0;
+  stack_frame_head = fra.me.prev;
   return;
 }
-val_t abstract_collection___ContainerIterator___is_ok(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 163, LOCATE_abstract_collection___ContainerIterator___is_ok};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  tracehead = trace.prev;
-  return ATTR_abstract_collection___ContainerIterator____is_ok( self) /*ContainerIterator::_is_ok*/;
-}
-void abstract_collection___ContainerIterator___init(val_t  self, val_t  param0, int* init_table) {
-  struct trace_t trace = {NULL, NULL, 161, LOCATE_abstract_collection___ContainerIterator___init};
-  val_t variable[3];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Local variable */
-  variable[1] =  param0;
-  if (init_table[VAL2OBJ(variable[0])->vft[INIT_TABLE_POS_ContainerIterator].i]) return;
-  /* Register variable[2]: Method return value and escape marker */
-  ATTR_abstract_collection___ContainerIterator____container(variable[0]) /*ContainerIterator::_container*/ =  variable[1] /*c*/;
-  return_label20: while(false);
-  init_table[VAL2OBJ(variable[0])->vft[INIT_TABLE_POS_ContainerIterator].i] = 1;
-  tracehead = trace.prev;
+void abstract_collection___ContainerIterator___init(val_t p0, val_t p1, int* init_table){
+  int itpos1 = VAL2OBJ(p0)->vft[INIT_TABLE_POS_ContainerIterator].i;
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t tmp;
+  if (init_table[itpos1]) return;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 172;
+  fra.me.meth = LOCATE_abstract_collection___ContainerIterator___init;
+  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;
+  /* ./../lib/standard//collection//abstract_collection.nit:172 */
+  ATTR_abstract_collection___ContainerIterator____container(fra.me.REG[0]) = fra.me.REG[1];
+  stack_frame_head = fra.me.prev;
+  init_table[itpos1] = 1;
   return;
 }
-void abstract_collection___RemovableCollection___clear(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 171, LOCATE_abstract_collection___RemovableCollection___clear};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 171);
-  nit_exit(1);
-  tracehead = trace.prev;
+val_t abstract_collection___ContainerIterator___is_ok(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_abstract_collection;
+  fra.me.line = 174;
+  fra.me.meth = LOCATE_abstract_collection___ContainerIterator___is_ok;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//collection//abstract_collection.nit:174 */
+  REGB0 = TAG_Bool(ATTR_abstract_collection___ContainerIterator____is_ok(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_is_ok", LOCATE_abstract_collection, 174);
+  }
+  REGB0 = ATTR_abstract_collection___ContainerIterator____is_ok(fra.me.REG[0]);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
+}
+void abstract_collection___RemovableCollection___clear(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 182;
+  fra.me.meth = LOCATE_abstract_collection___RemovableCollection___clear;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:182 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 182);
+  stack_frame_head = fra.me.prev;
   return;
 }
-void abstract_collection___RemovableCollection___remove(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 174, LOCATE_abstract_collection___RemovableCollection___remove};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 174);
-  nit_exit(1);
-  tracehead = trace.prev;
+void abstract_collection___RemovableCollection___remove(val_t p0, val_t p1){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 185;
+  fra.me.meth = LOCATE_abstract_collection___RemovableCollection___remove;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:185 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 185);
+  stack_frame_head = fra.me.prev;
   return;
 }
-void abstract_collection___RemovableCollection___remove_all(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 177, LOCATE_abstract_collection___RemovableCollection___remove_all};
-  val_t variable[4];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* 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 */
-  while (true) { /*while*/
-    /* Register variable[3]: Result */
-    variable[3] = CALL_abstract_collection___Collection___has(variable[0])(variable[0],  variable[1] /*item*/) /*Collection::has*/;
-    if (!UNTAG_Bool(variable[3])) break; /* while*/
-    CALL_abstract_collection___RemovableCollection___remove(variable[0])(variable[0],  variable[1] /*item*/) /*RemovableCollection::remove*/;
-    continue_22: while(0);
+void abstract_collection___RemovableCollection___remove_all(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_abstract_collection;
+  fra.me.line = 188;
+  fra.me.meth = LOCATE_abstract_collection___RemovableCollection___remove_all;
+  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;
+  /* ./../lib/standard//collection//abstract_collection.nit:189 */
+  while(1) {
+    REGB0 = CALL_abstract_collection___Collection___has(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
+    if (UNTAG_Bool(REGB0)) {
+      CALL_abstract_collection___RemovableCollection___remove(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
+    } else {
+      goto label1;
+    }
   }
-  break_22: while(0);
-  return_label21: while(false);
-  tracehead = trace.prev;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
   return;
 }
-void abstract_collection___SimpleCollection___add(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 184, LOCATE_abstract_collection___SimpleCollection___add};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 184);
-  nit_exit(1);
-  tracehead = trace.prev;
+void abstract_collection___SimpleCollection___add(val_t p0, val_t p1){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 195;
+  fra.me.meth = LOCATE_abstract_collection___SimpleCollection___add;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:195 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 195);
+  stack_frame_head = fra.me.prev;
   return;
 }
-void abstract_collection___SimpleCollection___add_all(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 188, LOCATE_abstract_collection___SimpleCollection___add_all};
-  val_t variable[6];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* 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] = TAG_Bool(!UNTAG_Bool(TAG_Bool(( variable[1] /*coll*/ ==  NIT_NULL /*null*/) || (( variable[1] /*coll*/ != NIT_NULL) && ((CALL_kernel___Object_____eqeq( variable[1] /*coll*/)==kernel___Object_____eqeq)?(IS_EQUAL_NN( variable[1] /*coll*/, NIT_NULL /*null*/)):(UNTAG_Bool(CALL_kernel___Object_____eqeq( variable[1] /*coll*/)( variable[1] /*coll*/,  NIT_NULL /*null*/) /*Object::==*/)))))));
-  if (UNTAG_Bool(variable[3])) { /*if*/
-    /* Register variable[3]: For iterator */
-    variable[3] = CALL_abstract_collection___Collection___iterator( variable[1] /*coll*/)( variable[1] /*coll*/) /*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];
-      CALL_abstract_collection___SimpleCollection___add(variable[0])(variable[0],  variable[5] /*i*/) /*SimpleCollection::add*/;
-      continue_24: while(0);
-      CALL_abstract_collection___Iterator___next(variable[3])(variable[3]) /*Iterator::next*/;
-    }
-    break_24: while(0);
-  }
-  return_label23: while(false);
-  tracehead = trace.prev;
+void abstract_collection___SimpleCollection___add_all(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_abstract_collection;
+  fra.me.line = 199;
+  fra.me.meth = LOCATE_abstract_collection___SimpleCollection___add_all;
+  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;
+  CALL_abstract_collection___Collection___iterate(fra.me.REG[1])(fra.me.REG[1], (&(fra.me)), ((fun_t)OC_abstract_collection___SimpleCollection___add_all_1));
+  stack_frame_head = fra.me.prev;
   return;
 }
-val_t abstract_collection___Set___has_only(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 204, LOCATE_abstract_collection___Set___has_only};
-  val_t variable[5];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* 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]: Local variable */
-  /* Register variable[4]: Result */
-  variable[4] = CALL_abstract_collection___Collection___length(variable[0])(variable[0]) /*Collection::length*/;
-  variable[3] = variable[4];
-  /* Register variable[4]: Result */
-  variable[4] = TAG_Bool(( variable[3] /*l*/)==( TAG_Int(1)));
-  if (UNTAG_Bool(variable[4])) { /*if*/
-    /* Register variable[4]: Result */
-    variable[4] = CALL_abstract_collection___Collection___has(variable[0])(variable[0],  variable[1] /*item*/) /*Collection::has*/;
-    variable[2] = variable[4];
-    goto return_label25;
-  } else { /*if*/
-    /* Register variable[4]: Result */
-    variable[4] = TAG_Bool(( variable[3] /*l*/)==( TAG_Int(0)));
-    if (UNTAG_Bool(variable[4])) { /*if*/
-      variable[2] =  TAG_Bool(true);
-      goto return_label25;
-    } else { /*if*/
-      variable[2] =  TAG_Bool(false);
-      goto return_label25;
+  void OC_abstract_collection___SimpleCollection___add_all_1(struct stack_frame_t *closctx, val_t p0, struct stack_frame_t *closctx_param, fun_t clos_fun0){
+    struct {struct stack_frame_t me;} fra;
+    fun_t CREG[1];
+    val_t tmp;
+    /* ./../lib/standard//collection//abstract_collection.nit:200 */
+    fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+    fra.me.file = LOCATE_abstract_collection;
+    fra.me.line = 0;
+    fra.me.meth = LOCATE_abstract_collection___SimpleCollection___add_all;
+    fra.me.has_broke = 0;
+    fra.me.REG_size = 1;
+    fra.me.REG[0] = NIT_NULL;
+    fra.me.closure_ctx = closctx_param;
+    fra.me.closure_funs = CREG;
+    fra.me.REG[0] = p0;
+    CREG[0] = clos_fun0;
+    CALL_abstract_collection___SimpleCollection___add(closctx->REG[0])(closctx->REG[0], fra.me.REG[0]);
+    stack_frame_head = fra.me.prev;
+    return;
+  }
+val_t abstract_collection___Set___has_only(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t REGB2;
+  val_t REGB3;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 215;
+  fra.me.meth = LOCATE_abstract_collection___Set___has_only;
+  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;
+  /* ./../lib/standard//collection//abstract_collection.nit:217 */
+  REGB0 = CALL_abstract_collection___Collection___length(fra.me.REG[0])(fra.me.REG[0]);
+  /* ./../lib/standard//collection//abstract_collection.nit:218 */
+  REGB1 = TAG_Int(1);
+  REGB2 = TAG_Bool(IS_EQUAL_OO(REGB0,REGB1));
+  if (UNTAG_Bool(REGB2)) {
+  } else {
+    /* ./../lib/standard//kernel.nit:207 */
+    REGB1 = TAG_Bool((REGB0)==(REGB1));
+    /* ./../lib/standard//collection//abstract_collection.nit:218 */
+    REGB2 = REGB1;
+  }
+  if (UNTAG_Bool(REGB2)) {
+    /* ./../lib/standard//collection//abstract_collection.nit:219 */
+    REGB2 = CALL_abstract_collection___Collection___has(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
+    goto label1;
+  } else {
+    /* ./../lib/standard//collection//abstract_collection.nit:220 */
+    REGB1 = TAG_Int(0);
+    REGB3 = TAG_Bool(IS_EQUAL_OO(REGB0,REGB1));
+    if (UNTAG_Bool(REGB3)) {
+    } else {
+      /* ./../lib/standard//kernel.nit:207 */
+      REGB1 = TAG_Bool((REGB0)==(REGB1));
+      /* ./../lib/standard//collection//abstract_collection.nit:220 */
+      REGB3 = REGB1;
+    }
+    if (UNTAG_Bool(REGB3)) {
+      /* ./../lib/standard//collection//abstract_collection.nit:221 */
+      REGB3 = TAG_Bool(true);
+      REGB2 = REGB3;
+      goto label1;
+    } else {
+      /* ./../lib/standard//collection//abstract_collection.nit:223 */
+      REGB3 = TAG_Bool(false);
+      REGB2 = REGB3;
+      goto label1;
     }
   }
-  return_label25: while(false);
-  tracehead = trace.prev;
-  return variable[2];
-}
-val_t abstract_collection___Set___count(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 216, LOCATE_abstract_collection___Set___count};
-  val_t variable[4];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* 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_abstract_collection___Collection___has(variable[0])(variable[0],  variable[1] /*item*/) /*Collection::has*/;
-  if (UNTAG_Bool(variable[3])) { /*if*/
-    variable[2] =  TAG_Int(1);
-    goto return_label26;
-  } else { /*if*/
-    variable[2] =  TAG_Int(0);
-    goto return_label26;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB2;
+}
+val_t abstract_collection___Set___count(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} 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_abstract_collection;
+  fra.me.line = 227;
+  fra.me.meth = LOCATE_abstract_collection___Set___count;
+  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;
+  /* ./../lib/standard//collection//abstract_collection.nit:230 */
+  REGB0 = CALL_abstract_collection___Collection___has(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
+  if (UNTAG_Bool(REGB0)) {
+    /* ./../lib/standard//collection//abstract_collection.nit:231 */
+    REGB0 = TAG_Int(1);
+    goto label1;
+  } else {
+    /* ./../lib/standard//collection//abstract_collection.nit:233 */
+    REGB1 = TAG_Int(0);
+    REGB0 = REGB1;
+    goto label1;
   }
-  return_label26: while(false);
-  tracehead = trace.prev;
-  return variable[2];
-}
-void abstract_collection___Set___remove_all(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 226, LOCATE_abstract_collection___Set___remove_all};
-  val_t variable[3];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* 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 */
-  CALL_abstract_collection___RemovableCollection___remove(variable[0])(variable[0],  variable[1] /*item*/) /*RemovableCollection::remove*/;
-  return_label27: while(false);
-  tracehead = trace.prev;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
+}
+void abstract_collection___Set___remove_all(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_abstract_collection;
+  fra.me.line = 237;
+  fra.me.meth = LOCATE_abstract_collection___Set___remove_all;
+  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;
+  /* ./../lib/standard//collection//abstract_collection.nit:238 */
+  CALL_abstract_collection___RemovableCollection___remove(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
+  stack_frame_head = fra.me.prev;
   return;
 }
-val_t abstract_collection___MapRead___iterator(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 238, LOCATE_abstract_collection___MapRead___iterator};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 238);
-  nit_exit(1);
-  tracehead = trace.prev;
+val_t abstract_collection___MapRead_____bra(val_t p0, val_t p1){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 243;
+  fra.me.meth = LOCATE_abstract_collection___MapRead_____bra;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:243 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 243);
+  stack_frame_head = fra.me.prev;
   return NIT_NULL;
 }
-val_t abstract_collection___MapRead_____bra(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 232, LOCATE_abstract_collection___MapRead_____bra};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 232);
-  nit_exit(1);
-  tracehead = trace.prev;
+val_t abstract_collection___MapRead___has_key(val_t p0, val_t p1){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 246;
+  fra.me.meth = LOCATE_abstract_collection___MapRead___has_key;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:246 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 246);
+  stack_frame_head = fra.me.prev;
   return NIT_NULL;
 }
-val_t abstract_collection___MapRead___has_key(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 235, LOCATE_abstract_collection___MapRead___has_key};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 235);
-  nit_exit(1);
-  tracehead = trace.prev;
+val_t abstract_collection___MapRead___iterator(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 249;
+  fra.me.meth = LOCATE_abstract_collection___MapRead___iterator;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:249 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 249);
+  stack_frame_head = fra.me.prev;
   return NIT_NULL;
 }
-void abstract_collection___Map_____braeq(val_t  self, val_t  param0, val_t  param1) {
-  struct trace_t trace = {NULL, NULL, 256, LOCATE_abstract_collection___Map_____braeq};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 256);
-  nit_exit(1);
-  tracehead = trace.prev;
+void abstract_collection___Map_____braeq(val_t p0, val_t p1, val_t p2){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 267;
+  fra.me.meth = LOCATE_abstract_collection___Map_____braeq;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:267 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 267);
+  stack_frame_head = fra.me.prev;
   return;
 }
-void abstract_collection___Map___remove_at(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 259, LOCATE_abstract_collection___Map___remove_at};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 259);
-  nit_exit(1);
-  tracehead = trace.prev;
+void abstract_collection___Map___remove_at(val_t p0, val_t p1){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 270;
+  fra.me.meth = LOCATE_abstract_collection___Map___remove_at;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:270 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 270);
+  stack_frame_head = fra.me.prev;
   return;
 }
-void abstract_collection___Map___recover_with(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 262, LOCATE_abstract_collection___Map___recover_with};
-  val_t variable[6];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* 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]: Local variable */
-  /* Register variable[4]: Result */
-  variable[4] = CALL_abstract_collection___Collection___iterator( variable[1] /*map*/)( variable[1] /*map*/) /*MapRead::iterator*/;
-  variable[3] = variable[4];
-  while (true) { /*while*/
-    /* Register variable[4]: Result */
-    variable[4] = CALL_abstract_collection___Iterator___is_ok( variable[3] /*i*/)( variable[3] /*i*/) /*Iterator::is_ok*/;
-    if (!UNTAG_Bool(variable[4])) break; /* while*/
-    /* Register variable[4]: Result */
-    variable[4] = CALL_abstract_collection___MapIterator___key( variable[3] /*i*/)( variable[3] /*i*/) /*MapIterator::key*/;
-    /* Register variable[5]: Result */
-    variable[5] = CALL_abstract_collection___Iterator___item( variable[3] /*i*/)( variable[3] /*i*/) /*Iterator::item*/;
-    CALL_abstract_collection___Map_____braeq(variable[0])(variable[0], variable[4], variable[5]) /*Map::[]=*/;
-    CALL_abstract_collection___Iterator___next( variable[3] /*i*/)( variable[3] /*i*/) /*Iterator::next*/;
-    continue_29: while(0);
+void abstract_collection___Map___recover_with(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[3];} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 273;
+  fra.me.meth = LOCATE_abstract_collection___Map___recover_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;
+  /* ./../lib/standard//collection//abstract_collection.nit:277 */
+  fra.me.REG[1] = CALL_abstract_collection___Collection___iterator(fra.me.REG[1])(fra.me.REG[1]);
+  /* ./../lib/standard//collection//abstract_collection.nit:278 */
+  while(1) {
+    REGB0 = CALL_abstract_collection___Iterator___is_ok(fra.me.REG[1])(fra.me.REG[1]);
+    if (UNTAG_Bool(REGB0)) {
+      /* ./../lib/standard//collection//abstract_collection.nit:279 */
+      fra.me.REG[2] = CALL_abstract_collection___MapIterator___key(fra.me.REG[1])(fra.me.REG[1]);
+      fra.me.REG[3] = CALL_abstract_collection___Iterator___item(fra.me.REG[1])(fra.me.REG[1]);
+      CALL_abstract_collection___Map_____braeq(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[2], fra.me.REG[3]);
+      /* ./../lib/standard//collection//abstract_collection.nit:280 */
+      CALL_abstract_collection___Iterator___next(fra.me.REG[1])(fra.me.REG[1]);
+    } else {
+      /* ./../lib/standard//collection//abstract_collection.nit:278 */
+      goto label1;
+    }
   }
-  break_29: while(0);
-  return_label28: while(false);
-  tracehead = trace.prev;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
   return;
 }
-val_t abstract_collection___MapIterator___key(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 277, LOCATE_abstract_collection___MapIterator___key};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 277);
-  nit_exit(1);
-  tracehead = trace.prev;
-  return NIT_NULL;
-}
-val_t abstract_collection___IndexedCollectionRead___iterator(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 316, LOCATE_abstract_collection___IndexedCollectionRead___iterator};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 316);
-  nit_exit(1);
-  tracehead = trace.prev;
+val_t abstract_collection___MapIterator___key(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 288;
+  fra.me.meth = LOCATE_abstract_collection___MapIterator___key;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:288 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 288);
+  stack_frame_head = fra.me.prev;
   return NIT_NULL;
 }
-val_t abstract_collection___IndexedCollectionRead___first(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 288, LOCATE_abstract_collection___IndexedCollectionRead___first};
-  val_t variable[3];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Method return value and escape marker */
-  /* Register variable[2]: Result */
-  variable[2] = CALL_abstract_collection___Collection___is_empty(variable[0])(variable[0]) /*Collection::is_empty*/;
-  if (!UNTAG_Bool( TAG_Bool(!UNTAG_Bool(variable[2])))) { fprintf(stderr, "Assert%s failed", " 'not_empty' "); fprintf(stderr, " in %s (%s:%d)\n", LOCATE_abstract_collection___IndexedCollectionRead___first, LOCATE_abstract_collection, 292); nit_exit(1);}
-  /* Register variable[2]: Result */
-  variable[2] = CALL_abstract_collection___MapRead_____bra(variable[0])(variable[0],  TAG_Int(0)) /*MapRead::[]*/;
-  variable[1] = variable[2];
-  goto return_label30;
-  return_label30: while(false);
-  tracehead = trace.prev;
-  return variable[1];
-}
-val_t abstract_collection___IndexedCollectionRead___last(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 296, LOCATE_abstract_collection___IndexedCollectionRead___last};
-  val_t variable[3];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Method return value and escape marker */
-  /* Register variable[2]: Result */
-  variable[2] = CALL_abstract_collection___Collection___is_empty(variable[0])(variable[0]) /*Collection::is_empty*/;
-  if (!UNTAG_Bool( TAG_Bool(!UNTAG_Bool(variable[2])))) { fprintf(stderr, "Assert%s failed", " 'not_empty' "); fprintf(stderr, " in %s (%s:%d)\n", LOCATE_abstract_collection___IndexedCollectionRead___last, LOCATE_abstract_collection, 300); nit_exit(1);}
-  /* Register variable[2]: Result */
-  variable[2] = CALL_abstract_collection___Collection___length(variable[0])(variable[0]) /*Collection::length*/;
-  /* Register variable[2]: Result */
-  variable[2] = TAG_Int(UNTAG_Int(variable[2])-UNTAG_Int( TAG_Int(1)));
-  /* Register variable[2]: Result */
-  variable[2] = CALL_abstract_collection___MapRead_____bra(variable[0])(variable[0], variable[2]) /*MapRead::[]*/;
-  variable[1] = variable[2];
-  goto return_label31;
-  return_label31: while(false);
-  tracehead = trace.prev;
-  return variable[1];
-}
-val_t abstract_collection___IndexedCollectionRead___index_of(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 304, LOCATE_abstract_collection___IndexedCollectionRead___index_of};
-  val_t variable[5];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* 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]: Local variable */
-  /* Register variable[4]: Result */
-  variable[4] = CALL_abstract_collection___Collection___iterator(variable[0])(variable[0]) /*IndexedCollectionRead::iterator*/;
-  variable[3] = variable[4];
-  while (true) { /*while*/
-    /* Register variable[4]: Result */
-    variable[4] = CALL_abstract_collection___Iterator___is_ok( variable[3] /*i*/)( variable[3] /*i*/) /*Iterator::is_ok*/;
-    if (!UNTAG_Bool(variable[4])) break; /* while*/
-    /* Register variable[4]: Result */
-    variable[4] = CALL_abstract_collection___Iterator___item( variable[3] /*i*/)( variable[3] /*i*/) /*Iterator::item*/;
-    /* Register variable[4]: Result */
-    variable[4] = TAG_Bool((variable[4] ==  variable[1] /*item*/) || ((variable[4] != NIT_NULL) && ((CALL_kernel___Object_____eqeq(variable[4])==kernel___Object_____eqeq)?(IS_EQUAL_NN(variable[4], variable[1] /*item*/)):(UNTAG_Bool(CALL_kernel___Object_____eqeq(variable[4])(variable[4],  variable[1] /*item*/) /*Object::==*/)))));
-    if (UNTAG_Bool(variable[4])) { /*if*/
-      /* Register variable[4]: Result */
-      variable[4] = CALL_abstract_collection___IndexedIterator___index( variable[3] /*i*/)( variable[3] /*i*/) /*IndexedIterator::index*/;
-      variable[2] = variable[4];
-      goto return_label32;
+val_t abstract_collection___SequenceRead___first(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_abstract_collection;
+  fra.me.line = 299;
+  fra.me.meth = LOCATE_abstract_collection___SequenceRead___first;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//collection//abstract_collection.nit:303 */
+  REGB0 = CALL_abstract_collection___Collection___is_empty(fra.me.REG[0])(fra.me.REG[0]);
+  REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    nit_abort("Assert %s  failed", "'not_empty'", LOCATE_abstract_collection, 303);
+  }
+  /* ./../lib/standard//collection//abstract_collection.nit:304 */
+  REGB0 = TAG_Int(0);
+  fra.me.REG[0] = CALL_abstract_collection___MapRead_____bra(fra.me.REG[0])(fra.me.REG[0], REGB0);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
+}
+val_t abstract_collection___SequenceRead___last(val_t p0){
+  struct {struct stack_frame_t me;} 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_abstract_collection;
+  fra.me.line = 307;
+  fra.me.meth = LOCATE_abstract_collection___SequenceRead___last;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//collection//abstract_collection.nit:311 */
+  REGB0 = CALL_abstract_collection___Collection___is_empty(fra.me.REG[0])(fra.me.REG[0]);
+  REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    nit_abort("Assert %s  failed", "'not_empty'", LOCATE_abstract_collection, 311);
+  }
+  /* ./../lib/standard//collection//abstract_collection.nit:312 */
+  REGB0 = CALL_abstract_collection___Collection___length(fra.me.REG[0])(fra.me.REG[0]);
+  REGB1 = TAG_Int(1);
+  /* ./../lib/standard//kernel.nit:217 */
+  REGB1 = TAG_Int(UNTAG_Int(REGB0)-UNTAG_Int(REGB1));
+  /* ./../lib/standard//collection//abstract_collection.nit:312 */
+  fra.me.REG[0] = CALL_abstract_collection___MapRead_____bra(fra.me.REG[0])(fra.me.REG[0], REGB1);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
+}
+val_t abstract_collection___SequenceRead___index_of(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_abstract_collection;
+  fra.me.line = 315;
+  fra.me.meth = LOCATE_abstract_collection___SequenceRead___index_of;
+  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;
+  /* ./../lib/standard//collection//abstract_collection.nit:319 */
+  fra.me.REG[0] = CALL_abstract_collection___Collection___iterator(fra.me.REG[0])(fra.me.REG[0]);
+  /* ./../lib/standard//collection//abstract_collection.nit:320 */
+  while(1) {
+    REGB0 = CALL_abstract_collection___Iterator___is_ok(fra.me.REG[0])(fra.me.REG[0]);
+    if (UNTAG_Bool(REGB0)) {
+      /* ./../lib/standard//collection//abstract_collection.nit:321 */
+      fra.me.REG[2] = CALL_abstract_collection___Iterator___item(fra.me.REG[0])(fra.me.REG[0]);
+      REGB0 = TAG_Bool(IS_EQUAL_NN(fra.me.REG[2],fra.me.REG[1]));
+      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], fra.me.REG[1]);
+          REGB0 = REGB1;
+        }
+      }
+      if (UNTAG_Bool(REGB0)) {
+        REGB0 = CALL_abstract_collection___IndexedIterator___index(fra.me.REG[0])(fra.me.REG[0]);
+        goto label1;
+      }
+      /* ./../lib/standard//collection//abstract_collection.nit:322 */
+      CALL_abstract_collection___Iterator___next(fra.me.REG[0])(fra.me.REG[0]);
+    } else {
+      /* ./../lib/standard//collection//abstract_collection.nit:320 */
+      goto label2;
     }
-    CALL_abstract_collection___Iterator___next( variable[3] /*i*/)( variable[3] /*i*/) /*Iterator::next*/;
-    continue_33: while(0);
   }
-  break_33: while(0);
-  /* Register variable[4]: Result */
-  variable[4] = TAG_Int(-UNTAG_Int( TAG_Int(1)));
-  variable[2] = variable[4];
-  goto return_label32;
-  return_label32: while(false);
-  tracehead = trace.prev;
-  return variable[2];
-}
-void abstract_collection___IndexedCollection___add(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 342, LOCATE_abstract_collection___IndexedCollection___add};
-  val_t variable[3];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* 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 */
-  CALL_abstract_collection___IndexedCollection___push(variable[0])(variable[0],  variable[1] /*e*/) /*IndexedCollection::push*/;
-  return_label34: while(false);
-  tracehead = trace.prev;
-  return;
+  label2: while(0);
+  /* ./../lib/standard//collection//abstract_collection.nit:324 */
+  REGB1 = TAG_Int(1);
+  /* ./../lib/standard//kernel.nit:216 */
+  REGB1 = TAG_Int(-UNTAG_Int(REGB1));
+  /* ./../lib/standard//collection//abstract_collection.nit:324 */
+  REGB0 = REGB1;
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
+}
+val_t abstract_collection___SequenceRead___iterator(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 327;
+  fra.me.meth = LOCATE_abstract_collection___SequenceRead___iterator;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:327 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 327);
+  stack_frame_head = fra.me.prev;
+  return NIT_NULL;
 }
-void abstract_collection___IndexedCollection___first__eq(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 325, LOCATE_abstract_collection___IndexedCollection___first__eq};
-  val_t variable[3];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* 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 */
-  CALL_abstract_collection___Map_____braeq(variable[0])(variable[0],  TAG_Int(0),  variable[1] /*item*/) /*Map::[]=*/;
-  return_label35: while(false);
-  tracehead = trace.prev;
+void abstract_collection___Sequence___first__eq(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_abstract_collection;
+  fra.me.line = 336;
+  fra.me.meth = LOCATE_abstract_collection___Sequence___first__eq;
+  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;
+  /* ./../lib/standard//collection//abstract_collection.nit:339 */
+  REGB0 = TAG_Int(0);
+  CALL_abstract_collection___Map_____braeq(fra.me.REG[0])(fra.me.REG[0], REGB0, fra.me.REG[1]);
+  stack_frame_head = fra.me.prev;
   return;
 }
-void abstract_collection___IndexedCollection___last__eq(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 330, LOCATE_abstract_collection___IndexedCollection___last__eq};
-  val_t variable[5];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* 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]: Local variable */
-  /* Register variable[4]: Result */
-  variable[4] = CALL_abstract_collection___Collection___length(variable[0])(variable[0]) /*Collection::length*/;
-  variable[3] = variable[4];
-  /* Register variable[4]: Result */
-  variable[4] = TAG_Bool(UNTAG_Int( variable[3] /*l*/)>UNTAG_Int( TAG_Int(0)));
-  if (UNTAG_Bool(variable[4])) { /*if*/
-    /* Register variable[4]: Result */
-    variable[4] = TAG_Int(UNTAG_Int( variable[3] /*l*/)-UNTAG_Int( TAG_Int(1)));
-    CALL_abstract_collection___Map_____braeq(variable[0])(variable[0], variable[4],  variable[1] /*item*/) /*Map::[]=*/;
-  } else { /*if*/
-    CALL_abstract_collection___Map_____braeq(variable[0])(variable[0],  TAG_Int(0),  variable[1] /*item*/) /*Map::[]=*/;
+void abstract_collection___Sequence___last__eq(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} 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_abstract_collection;
+  fra.me.line = 341;
+  fra.me.meth = LOCATE_abstract_collection___Sequence___last__eq;
+  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;
+  /* ./../lib/standard//collection//abstract_collection.nit:345 */
+  REGB0 = CALL_abstract_collection___Collection___length(fra.me.REG[0])(fra.me.REG[0]);
+  /* ./../lib/standard//collection//abstract_collection.nit:346 */
+  REGB1 = TAG_Int(0);
+  /* ./../lib/standard//kernel.nit:214 */
+  REGB1 = TAG_Bool(UNTAG_Int(REGB0)>UNTAG_Int(REGB1));
+  /* ./../lib/standard//collection//abstract_collection.nit:346 */
+  if (UNTAG_Bool(REGB1)) {
+    /* ./../lib/standard//collection//abstract_collection.nit:347 */
+    REGB1 = TAG_Int(1);
+    /* ./../lib/standard//kernel.nit:217 */
+    REGB1 = TAG_Int(UNTAG_Int(REGB0)-UNTAG_Int(REGB1));
+    /* ./../lib/standard//collection//abstract_collection.nit:347 */
+    CALL_abstract_collection___Map_____braeq(fra.me.REG[0])(fra.me.REG[0], REGB1, fra.me.REG[1]);
+  } else {
+    /* ./../lib/standard//collection//abstract_collection.nit:349 */
+    REGB1 = TAG_Int(0);
+    CALL_abstract_collection___Map_____braeq(fra.me.REG[0])(fra.me.REG[0], REGB1, fra.me.REG[1]);
   }
-  return_label36: while(false);
-  tracehead = trace.prev;
+  stack_frame_head = fra.me.prev;
   return;
 }
-void abstract_collection___IndexedCollection___push(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 345, LOCATE_abstract_collection___IndexedCollection___push};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 345);
-  nit_exit(1);
-  tracehead = trace.prev;
+void abstract_collection___Sequence___add(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_abstract_collection;
+  fra.me.line = 353;
+  fra.me.meth = LOCATE_abstract_collection___Sequence___add;
+  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;
+  /* ./../lib/standard//collection//abstract_collection.nit:354 */
+  CALL_abstract_collection___Sequence___push(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
+  stack_frame_head = fra.me.prev;
   return;
 }
-void abstract_collection___IndexedCollection___append(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 348, LOCATE_abstract_collection___IndexedCollection___append};
-  val_t variable[6];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* 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] = TAG_Bool(!UNTAG_Bool(TAG_Bool(( variable[1] /*coll*/ ==  NIT_NULL /*null*/) || (( variable[1] /*coll*/ != NIT_NULL) && ((CALL_kernel___Object_____eqeq( variable[1] /*coll*/)==kernel___Object_____eqeq)?(IS_EQUAL_NN( variable[1] /*coll*/, NIT_NULL /*null*/)):(UNTAG_Bool(CALL_kernel___Object_____eqeq( variable[1] /*coll*/)( variable[1] /*coll*/,  NIT_NULL /*null*/) /*Object::==*/)))))));
-  if (UNTAG_Bool(variable[3])) { /*if*/
-    /* Register variable[3]: For iterator */
-    variable[3] = CALL_abstract_collection___Collection___iterator( variable[1] /*coll*/)( variable[1] /*coll*/) /*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];
-      CALL_abstract_collection___IndexedCollection___push(variable[0])(variable[0],  variable[5] /*i*/) /*IndexedCollection::push*/;
-      continue_38: while(0);
-      CALL_abstract_collection___Iterator___next(variable[3])(variable[3]) /*Iterator::next*/;
-    }
-    break_38: while(0);
-  }
-  return_label37: while(false);
-  tracehead = trace.prev;
+void abstract_collection___Sequence___push(val_t p0, val_t p1){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 356;
+  fra.me.meth = LOCATE_abstract_collection___Sequence___push;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:356 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 356);
+  stack_frame_head = fra.me.prev;
+  return;
+}
+void abstract_collection___Sequence___append(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_abstract_collection;
+  fra.me.line = 359;
+  fra.me.meth = LOCATE_abstract_collection___Sequence___append;
+  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;
+  CALL_abstract_collection___Collection___iterate(fra.me.REG[1])(fra.me.REG[1], (&(fra.me)), ((fun_t)OC_abstract_collection___Sequence___append_1));
+  stack_frame_head = fra.me.prev;
   return;
 }
-val_t abstract_collection___IndexedCollection___pop(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 351, LOCATE_abstract_collection___IndexedCollection___pop};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 351);
-  nit_exit(1);
-  tracehead = trace.prev;
+  void OC_abstract_collection___Sequence___append_1(struct stack_frame_t *closctx, val_t p0, struct stack_frame_t *closctx_param, fun_t clos_fun0){
+    struct {struct stack_frame_t me;} fra;
+    fun_t CREG[1];
+    val_t tmp;
+    /* ./../lib/standard//collection//abstract_collection.nit:360 */
+    fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+    fra.me.file = LOCATE_abstract_collection;
+    fra.me.line = 0;
+    fra.me.meth = LOCATE_abstract_collection___Sequence___append;
+    fra.me.has_broke = 0;
+    fra.me.REG_size = 1;
+    fra.me.REG[0] = NIT_NULL;
+    fra.me.closure_ctx = closctx_param;
+    fra.me.closure_funs = CREG;
+    fra.me.REG[0] = p0;
+    CREG[0] = clos_fun0;
+    CALL_abstract_collection___Sequence___push(closctx->REG[0])(closctx->REG[0], fra.me.REG[0]);
+    stack_frame_head = fra.me.prev;
+    return;
+  }
+val_t abstract_collection___Sequence___pop(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 362;
+  fra.me.meth = LOCATE_abstract_collection___Sequence___pop;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:362 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 362);
+  stack_frame_head = fra.me.prev;
   return NIT_NULL;
 }
-void abstract_collection___IndexedCollection___unshift(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 354, LOCATE_abstract_collection___IndexedCollection___unshift};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 354);
-  nit_exit(1);
-  tracehead = trace.prev;
+void abstract_collection___Sequence___unshift(val_t p0, val_t p1){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 365;
+  fra.me.meth = LOCATE_abstract_collection___Sequence___unshift;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:365 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 365);
+  stack_frame_head = fra.me.prev;
   return;
 }
-val_t abstract_collection___IndexedCollection___shift(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 357, LOCATE_abstract_collection___IndexedCollection___shift};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 357);
-  nit_exit(1);
-  tracehead = trace.prev;
+val_t abstract_collection___Sequence___shift(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 368;
+  fra.me.meth = LOCATE_abstract_collection___Sequence___shift;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:368 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 368);
+  stack_frame_head = fra.me.prev;
   return NIT_NULL;
 }
-val_t abstract_collection___IndexedIterator___key(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 369, LOCATE_abstract_collection___IndexedIterator___key};
-  val_t variable[3];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Method return value and escape marker */
-  /* Register variable[2]: Result */
-  variable[2] = CALL_abstract_collection___IndexedIterator___index(variable[0])(variable[0]) /*IndexedIterator::index*/;
-  variable[1] = variable[2];
-  goto return_label39;
-  return_label39: while(false);
-  tracehead = trace.prev;
-  return variable[1];
-}
-val_t abstract_collection___IndexedIterator___index(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 366, LOCATE_abstract_collection___IndexedIterator___index};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 366);
-  nit_exit(1);
-  tracehead = trace.prev;
+val_t abstract_collection___IndexedIterator___index(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 377;
+  fra.me.meth = LOCATE_abstract_collection___IndexedIterator___index;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:377 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 377);
+  stack_frame_head = fra.me.prev;
   return NIT_NULL;
 }
-val_t abstract_collection___CoupleMap_____bra(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 380, LOCATE_abstract_collection___CoupleMap_____bra};
-  val_t variable[5];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* 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]: Local variable */
-  /* Register variable[4]: Result */
-  variable[4] = CALL_abstract_collection___CoupleMap___couple_at(variable[0])(variable[0],  variable[1] /*key*/) /*CoupleMap::couple_at*/;
-  variable[3] = variable[4];
-  /* Register variable[4]: Result */
-  variable[4] = TAG_Bool(( variable[3] /*c*/ ==  NIT_NULL /*null*/) || (( variable[3] /*c*/ != NIT_NULL) && ((CALL_kernel___Object_____eqeq( variable[3] /*c*/)==kernel___Object_____eqeq)?(IS_EQUAL_NN( variable[3] /*c*/, NIT_NULL /*null*/)):(UNTAG_Bool(CALL_kernel___Object_____eqeq( variable[3] /*c*/)( variable[3] /*c*/,  NIT_NULL /*null*/) /*Object::==*/)))));
-  if (UNTAG_Bool(variable[4])) { /*if*/
-    fprintf(stderr, "Aborted"); fprintf(stderr, " in %s (%s:%d)\n", LOCATE_abstract_collection___CoupleMap_____bra, LOCATE_abstract_collection, 384); nit_exit(1);
-  } else { /*if*/
-    /* Register variable[4]: Result */
-    variable[4] = CALL_abstract_collection___Couple___second( variable[3] /*c*/)( variable[3] /*c*/) /*Couple::second*/;
-    variable[2] = variable[4];
-    goto return_label40;
-  }
-  return_label40: while(false);
-  tracehead = trace.prev;
-  return variable[2];
-}
-val_t abstract_collection___CoupleMap___has_key(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 390, LOCATE_abstract_collection___CoupleMap___has_key};
-  val_t variable[4];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* 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_abstract_collection___CoupleMap___couple_at(variable[0])(variable[0],  variable[1] /*key*/) /*CoupleMap::couple_at*/;
-  /* Register variable[3]: Result */
-  variable[3] = TAG_Bool(!UNTAG_Bool(TAG_Bool((variable[3] ==  NIT_NULL /*null*/) || ((variable[3] != NIT_NULL) && ((CALL_kernel___Object_____eqeq(variable[3])==kernel___Object_____eqeq)?(IS_EQUAL_NN(variable[3], NIT_NULL /*null*/)):(UNTAG_Bool(CALL_kernel___Object_____eqeq(variable[3])(variable[3],  NIT_NULL /*null*/) /*Object::==*/)))))));
-  variable[2] = variable[3];
-  goto return_label41;
-  return_label41: while(false);
-  tracehead = trace.prev;
-  return variable[2];
-}
-val_t abstract_collection___CoupleMap___couple_at(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 376, LOCATE_abstract_collection___CoupleMap___couple_at};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  fprintf(stderr, "Deferred method called");
-  fprintf(stderr, " (%s:%d)\n", LOCATE_abstract_collection, 376);
-  nit_exit(1);
-  tracehead = trace.prev;
+val_t abstract_collection___IndexedIterator___key(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_abstract_collection;
+  fra.me.line = 380;
+  fra.me.meth = LOCATE_abstract_collection___IndexedIterator___key;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//collection//abstract_collection.nit:381 */
+  REGB0 = CALL_abstract_collection___IndexedIterator___index(fra.me.REG[0])(fra.me.REG[0]);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
+}
+val_t abstract_collection___CoupleMap___couple_at(val_t p0, val_t p1){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 387;
+  fra.me.meth = LOCATE_abstract_collection___CoupleMap___couple_at;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  /* ./../lib/standard//collection//abstract_collection.nit:387 */
+  nit_abort("Deferred method called", NULL, LOCATE_abstract_collection, 387);
+  stack_frame_head = fra.me.prev;
   return NIT_NULL;
 }
-val_t abstract_collection___CoupleMapIterator___item(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 398, LOCATE_abstract_collection___CoupleMapIterator___item};
-  val_t variable[3];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Method return value and escape marker */
-  /* Register variable[2]: Result */
-  variable[2] = ATTR_abstract_collection___CoupleMapIterator____iter(variable[0]) /*CoupleMapIterator::_iter*/;
-  /* Register variable[2]: Result */
-  variable[2] = CALL_abstract_collection___Iterator___item(variable[2])(variable[2]) /*Iterator::item*/;
-  /* Register variable[2]: Result */
-  variable[2] = CALL_abstract_collection___Couple___second(variable[2])(variable[2]) /*Couple::second*/;
-  variable[1] = variable[2];
-  goto return_label42;
-  return_label42: while(false);
-  tracehead = trace.prev;
-  return variable[1];
-}
-void abstract_collection___CoupleMapIterator___next(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 406, LOCATE_abstract_collection___CoupleMapIterator___next};
-  val_t variable[3];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Method return value and escape marker */
-  /* Register variable[2]: Result */
-  variable[2] = ATTR_abstract_collection___CoupleMapIterator____iter(variable[0]) /*CoupleMapIterator::_iter*/;
-  CALL_abstract_collection___Iterator___next(variable[2])(variable[2]) /*Iterator::next*/;
-  while (true) { /*while*/
-    /* Register variable[2]: Result */
-    variable[2] = ATTR_abstract_collection___CoupleMapIterator____iter(variable[0]) /*CoupleMapIterator::_iter*/;
-    /* Register variable[2]: Result */
-    variable[2] = CALL_abstract_collection___Iterator___is_ok(variable[2])(variable[2]) /*Iterator::is_ok*/;
-    /* Ensure var variable[2]: Left 'and' operand*/
-    if (UNTAG_Bool(variable[2])) { /* and */
-      /* Register variable[2]: Result */
-      variable[2] = ATTR_abstract_collection___CoupleMapIterator____iter(variable[0]) /*CoupleMapIterator::_iter*/;
-      /* Register variable[2]: Result */
-      variable[2] = CALL_abstract_collection___Iterator___item(variable[2])(variable[2]) /*Iterator::item*/;
-      /* Register variable[2]: Result */
-      variable[2] = TAG_Bool((variable[2] ==  NIT_NULL /*null*/) || ((variable[2] != NIT_NULL) && ((CALL_kernel___Object_____eqeq(variable[2])==kernel___Object_____eqeq)?(IS_EQUAL_NN(variable[2], NIT_NULL /*null*/)):(UNTAG_Bool(CALL_kernel___Object_____eqeq(variable[2])(variable[2],  NIT_NULL /*null*/) /*Object::==*/)))));
+val_t abstract_collection___CoupleMap_____bra(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} 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_abstract_collection;
+  fra.me.line = 391;
+  fra.me.meth = LOCATE_abstract_collection___CoupleMap_____bra;
+  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;
+  /* ./../lib/standard//collection//abstract_collection.nit:393 */
+  fra.me.REG[1] = CALL_abstract_collection___CoupleMap___couple_at(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
+  /* ./../lib/standard//collection//abstract_collection.nit:394 */
+  REGB0 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    REGB1 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
+    if (UNTAG_Bool(REGB1)) {
+      REGB1 = TAG_Bool(false);
+      REGB0 = REGB1;
+    } else {
+      REGB1 = CALL_kernel___Object_____eqeq(fra.me.REG[1])(fra.me.REG[1], NIT_NULL);
+      REGB0 = REGB1;
+    }
+  }
+  if (UNTAG_Bool(REGB0)) {
+    /* ./../lib/standard//collection//abstract_collection.nit:395 */
+    nit_abort("Aborted", NULL, LOCATE_abstract_collection, 395);
+  } else {
+    /* ./../lib/standard//collection//abstract_collection.nit:397 */
+    REGB0 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
+    if (UNTAG_Bool(REGB0)) {
+      nit_abort("Reciever is null", NULL, LOCATE_abstract_collection, 397);
+    }
+    fra.me.REG[1] = CALL_abstract_collection___Couple___second(fra.me.REG[1])(fra.me.REG[1]);
+    goto label1;
+  }
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[1];
+}
+val_t abstract_collection___CoupleMap___has_key(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} 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_abstract_collection;
+  fra.me.line = 401;
+  fra.me.meth = LOCATE_abstract_collection___CoupleMap___has_key;
+  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;
+  /* ./../lib/standard//collection//abstract_collection.nit:401 */
+  fra.me.REG[1] = CALL_abstract_collection___CoupleMap___couple_at(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
+  REGB0 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    REGB1 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
+    if (UNTAG_Bool(REGB1)) {
+      REGB1 = TAG_Bool(false);
+      REGB0 = REGB1;
+    } else {
+      REGB1 = CALL_kernel___Object_____eqeq(fra.me.REG[1])(fra.me.REG[1], NIT_NULL);
+      REGB0 = REGB1;
     }
-    /* Register variable[2]: Result */
-    if (!UNTAG_Bool(variable[2])) break; /* while*/
-    /* Register variable[2]: Result */
-    variable[2] = ATTR_abstract_collection___CoupleMapIterator____iter(variable[0]) /*CoupleMapIterator::_iter*/;
-    CALL_abstract_collection___Iterator___next(variable[2])(variable[2]) /*Iterator::next*/;
-    continue_44: while(0);
   }
-  break_44: while(0);
-  return_label43: while(false);
-  tracehead = trace.prev;
+  REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
+}
+val_t abstract_collection___CoupleMapIterator___item(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_abstract_collection;
+  fra.me.line = 409;
+  fra.me.meth = LOCATE_abstract_collection___CoupleMapIterator___item;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//collection//abstract_collection.nit:409 */
+  REGB0 = TAG_Bool(ATTR_abstract_collection___CoupleMapIterator____iter(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_iter", LOCATE_abstract_collection, 409);
+  }
+  fra.me.REG[0] = ATTR_abstract_collection___CoupleMapIterator____iter(fra.me.REG[0]);
+  fra.me.REG[0] = CALL_abstract_collection___Iterator___item(fra.me.REG[0])(fra.me.REG[0]);
+  REGB0 = TAG_Bool(fra.me.REG[0]==NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+    nit_abort("Reciever is null", NULL, LOCATE_abstract_collection, 409);
+  }
+  fra.me.REG[0] = CALL_abstract_collection___Couple___second(fra.me.REG[0])(fra.me.REG[0]);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
+}
+val_t abstract_collection___CoupleMapIterator___key(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_abstract_collection;
+  fra.me.line = 413;
+  fra.me.meth = LOCATE_abstract_collection___CoupleMapIterator___key;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//collection//abstract_collection.nit:413 */
+  REGB0 = TAG_Bool(ATTR_abstract_collection___CoupleMapIterator____iter(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_iter", LOCATE_abstract_collection, 413);
+  }
+  fra.me.REG[0] = ATTR_abstract_collection___CoupleMapIterator____iter(fra.me.REG[0]);
+  fra.me.REG[0] = CALL_abstract_collection___Iterator___item(fra.me.REG[0])(fra.me.REG[0]);
+  REGB0 = TAG_Bool(fra.me.REG[0]==NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+    nit_abort("Reciever is null", NULL, LOCATE_abstract_collection, 413);
+  }
+  fra.me.REG[0] = CALL_abstract_collection___Couple___first(fra.me.REG[0])(fra.me.REG[0]);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
+}
+val_t abstract_collection___CoupleMapIterator___is_ok(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_abstract_collection;
+  fra.me.line = 415;
+  fra.me.meth = LOCATE_abstract_collection___CoupleMapIterator___is_ok;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//collection//abstract_collection.nit:415 */
+  REGB0 = TAG_Bool(ATTR_abstract_collection___CoupleMapIterator____iter(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_iter", LOCATE_abstract_collection, 415);
+  }
+  fra.me.REG[0] = ATTR_abstract_collection___CoupleMapIterator____iter(fra.me.REG[0]);
+  REGB0 = CALL_abstract_collection___Iterator___is_ok(fra.me.REG[0])(fra.me.REG[0]);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
+}
+void abstract_collection___CoupleMapIterator___next(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_abstract_collection;
+  fra.me.line = 417;
+  fra.me.meth = LOCATE_abstract_collection___CoupleMapIterator___next;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//collection//abstract_collection.nit:419 */
+  REGB0 = TAG_Bool(ATTR_abstract_collection___CoupleMapIterator____iter(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_iter", LOCATE_abstract_collection, 419);
+  }
+  fra.me.REG[0] = ATTR_abstract_collection___CoupleMapIterator____iter(fra.me.REG[0]);
+  CALL_abstract_collection___Iterator___next(fra.me.REG[0])(fra.me.REG[0]);
+  stack_frame_head = fra.me.prev;
   return;
 }
-val_t abstract_collection___CoupleMapIterator___is_ok(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 404, LOCATE_abstract_collection___CoupleMapIterator___is_ok};
-  val_t variable[3];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Method return value and escape marker */
-  /* Register variable[2]: Result */
-  variable[2] = ATTR_abstract_collection___CoupleMapIterator____iter(variable[0]) /*CoupleMapIterator::_iter*/;
-  /* Register variable[2]: Result */
-  variable[2] = CALL_abstract_collection___Iterator___is_ok(variable[2])(variable[2]) /*Iterator::is_ok*/;
-  variable[1] = variable[2];
-  goto return_label45;
-  return_label45: while(false);
-  tracehead = trace.prev;
-  return variable[1];
-}
-val_t abstract_collection___CoupleMapIterator___key(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 402, LOCATE_abstract_collection___CoupleMapIterator___key};
-  val_t variable[3];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Method return value and escape marker */
-  /* Register variable[2]: Result */
-  variable[2] = ATTR_abstract_collection___CoupleMapIterator____iter(variable[0]) /*CoupleMapIterator::_iter*/;
-  /* Register variable[2]: Result */
-  variable[2] = CALL_abstract_collection___Iterator___item(variable[2])(variable[2]) /*Iterator::item*/;
-  /* Register variable[2]: Result */
-  variable[2] = CALL_abstract_collection___Couple___first(variable[2])(variable[2]) /*Couple::first*/;
-  variable[1] = variable[2];
-  goto return_label46;
-  return_label46: while(false);
-  tracehead = trace.prev;
-  return variable[1];
-}
-void abstract_collection___CoupleMapIterator___init(val_t  self, val_t  param0, int* init_table) {
-  struct trace_t trace = {NULL, NULL, 414, LOCATE_abstract_collection___CoupleMapIterator___init};
-  val_t variable[3];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* Register variable[0]: Local variable */
-  variable[0] =  self;
-  /* Register variable[1]: Local variable */
-  variable[1] =  param0;
-  if (init_table[VAL2OBJ(variable[0])->vft[INIT_TABLE_POS_CoupleMapIterator].i]) return;
-  /* Register variable[2]: Method return value and escape marker */
-  ATTR_abstract_collection___CoupleMapIterator____iter(variable[0]) /*CoupleMapIterator::_iter*/ =  variable[1] /*i*/;
-  return_label47: while(false);
-  init_table[VAL2OBJ(variable[0])->vft[INIT_TABLE_POS_CoupleMapIterator].i] = 1;
-  tracehead = trace.prev;
+void abstract_collection___CoupleMapIterator___init(val_t p0, val_t p1, int* init_table){
+  int itpos2 = VAL2OBJ(p0)->vft[INIT_TABLE_POS_CoupleMapIterator].i;
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t tmp;
+  if (init_table[itpos2]) return;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 424;
+  fra.me.meth = LOCATE_abstract_collection___CoupleMapIterator___init;
+  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;
+  /* ./../lib/standard//collection//abstract_collection.nit:424 */
+  ATTR_abstract_collection___CoupleMapIterator____iter(fra.me.REG[0]) = fra.me.REG[1];
+  stack_frame_head = fra.me.prev;
+  init_table[itpos2] = 1;
   return;
 }
-val_t abstract_collection___Couple___first(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 422, LOCATE_abstract_collection___Couple___first};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  tracehead = trace.prev;
-  return ATTR_abstract_collection___Couple____first( self) /*Couple::_first*/;
-}
-void abstract_collection___Couple___first__eq(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 422, LOCATE_abstract_collection___Couple___first__eq};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  ATTR_abstract_collection___Couple____first( self) /*Couple::_first*/ =  param0;
-  tracehead = trace.prev;
+val_t abstract_collection___Couple___first(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 432;
+  fra.me.meth = LOCATE_abstract_collection___Couple___first;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//collection//abstract_collection.nit:432 */
+  fra.me.REG[0] = ATTR_abstract_collection___Couple____first(fra.me.REG[0]);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
+}
+void abstract_collection___Couple___first__eq(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_abstract_collection;
+  fra.me.line = 432;
+  fra.me.meth = LOCATE_abstract_collection___Couple___first__eq;
+  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;
+  /* ./../lib/standard//collection//abstract_collection.nit:432 */
+  ATTR_abstract_collection___Couple____first(fra.me.REG[0]) = fra.me.REG[1];
+  stack_frame_head = fra.me.prev;
   return;
 }
-val_t abstract_collection___Couple___second(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 425, LOCATE_abstract_collection___Couple___second};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  tracehead = trace.prev;
-  return ATTR_abstract_collection___Couple____second( self) /*Couple::_second*/;
-}
-void abstract_collection___Couple___second__eq(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 425, LOCATE_abstract_collection___Couple___second__eq};
-  val_t *variable = NULL;
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  ATTR_abstract_collection___Couple____second( self) /*Couple::_second*/ =  param0;
-  tracehead = trace.prev;
+val_t abstract_collection___Couple___second(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 435;
+  fra.me.meth = LOCATE_abstract_collection___Couple___second;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//collection//abstract_collection.nit:435 */
+  fra.me.REG[0] = ATTR_abstract_collection___Couple____second(fra.me.REG[0]);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
+}
+void abstract_collection___Couple___second__eq(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_abstract_collection;
+  fra.me.line = 435;
+  fra.me.meth = LOCATE_abstract_collection___Couple___second__eq;
+  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;
+  /* ./../lib/standard//collection//abstract_collection.nit:435 */
+  ATTR_abstract_collection___Couple____second(fra.me.REG[0]) = fra.me.REG[1];
+  stack_frame_head = fra.me.prev;
   return;
 }
-void abstract_collection___Couple___init(val_t  self, val_t  param0, val_t  param1, int* init_table) {
-  struct trace_t trace = {NULL, NULL, 428, LOCATE_abstract_collection___Couple___init};
-  val_t variable[4];
-  struct WBT_ **closurevariable = NULL;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_abstract_collection;
-  /* 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_Couple].i]) return;
-  /* Register variable[3]: Method return value and escape marker */
-  ATTR_abstract_collection___Couple____first(variable[0]) /*Couple::_first*/ =  variable[1] /*f*/;
-  ATTR_abstract_collection___Couple____second(variable[0]) /*Couple::_second*/ =  variable[2] /*s*/;
-  return_label48: while(false);
-  init_table[VAL2OBJ(variable[0])->vft[INIT_TABLE_POS_Couple].i] = 1;
-  tracehead = trace.prev;
+void abstract_collection___Couple___init(val_t p0, val_t p1, val_t p2, int* init_table){
+  int itpos3 = VAL2OBJ(p0)->vft[INIT_TABLE_POS_Couple].i;
+  struct {struct stack_frame_t me; val_t MORE_REG[2];} fra;
+  val_t tmp;
+  if (init_table[itpos3]) return;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_abstract_collection;
+  fra.me.line = 438;
+  fra.me.meth = LOCATE_abstract_collection___Couple___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;
+  /* ./../lib/standard//collection//abstract_collection.nit:441 */
+  ATTR_abstract_collection___Couple____first(fra.me.REG[0]) = fra.me.REG[1];
+  /* ./../lib/standard//collection//abstract_collection.nit:442 */
+  ATTR_abstract_collection___Couple____second(fra.me.REG[0]) = fra.me.REG[2];
+  stack_frame_head = fra.me.prev;
+  init_table[itpos3] = 1;
   return;
 }