c_src: update

[nit.git] / c_src / partial_order._sep.c

diff --git a/c_src/partial_order._sep.c b/c_src/partial_order._sep.c
index dbbf0bf..c3e81e8 100644 (file)
--- a/c_src/partial_order._sep.c
+++ b/c_src/partial_order._sep.c
@@ -1,29 +1,24 @@
 /* This C file is generated by NIT to compile module partial_order. */
 #include "partial_order._sep.h"
-val_t partial_order___PartialOrder___iterator(val_t p0){
+val_t partial_order___PartialOrder___roots(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_partial_order;
-  fra.me.line = 54;
-  fra.me.meth = LOCATE_partial_order___PartialOrder___iterator;
+  fra.me.line = 30;
+  fra.me.meth = LOCATE_partial_order___PartialOrder___roots;
   fra.me.has_broke = 0;
   fra.me.REG_size = 1;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[0] = p0;
-  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____elements_list(fra.me.REG[0])!=NIT_NULL);
-  /* ./metamodel//partial_order.nit:54 */
+  /* ./metamodel//partial_order.nit:30 */
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____roots(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Uninitialized attribute %s", "_elements_list");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 54);
-    nit_exit(1);
+    nit_abort("Uninitialized attribute %s", "_roots", LOCATE_partial_order, 30);
   }
-  fra.me.REG[0] = ATTR_partial_order___PartialOrder____elements_list(fra.me.REG[0]);
-  fra.me.REG[0] = CALL_abstract_collection___Collection___iterator(fra.me.REG[0])(fra.me.REG[0]);
-  goto label1;
-  label1: while(0);
+  fra.me.REG[0] = ATTR_partial_order___PartialOrder____roots(fra.me.REG[0]);
   stack_frame_head = fra.me.prev;
   return fra.me.REG[0];
 }
@@ -39,13 +34,11 @@ val_t partial_order___PartialOrder___is_empty(val_t p0){
   fra.me.REG_size = 1;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[0] = p0;
-  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____elements(fra.me.REG[0])!=NIT_NULL);
   /* ./metamodel//partial_order.nit:35 */
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____elements(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Uninitialized attribute %s", "_elements");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 35);
-    nit_exit(1);
+    nit_abort("Uninitialized attribute %s", "_elements", LOCATE_partial_order, 35);
   }
   fra.me.REG[0] = ATTR_partial_order___PartialOrder____elements(fra.me.REG[0]);
   REGB0 = CALL_abstract_collection___Collection___is_empty(fra.me.REG[0])(fra.me.REG[0]);
@@ -66,13 +59,11 @@ val_t partial_order___PartialOrder___length(val_t p0){
   fra.me.REG_size = 1;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[0] = p0;
-  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____elements(fra.me.REG[0])!=NIT_NULL);
   /* ./metamodel//partial_order.nit:37 */
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____elements(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Uninitialized attribute %s", "_elements");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 37);
-    nit_exit(1);
+    nit_abort("Uninitialized attribute %s", "_elements", LOCATE_partial_order, 37);
   }
   fra.me.REG[0] = ATTR_partial_order___PartialOrder____elements(fra.me.REG[0]);
   REGB0 = CALL_abstract_collection___Collection___length(fra.me.REG[0])(fra.me.REG[0]);
@@ -81,6 +72,31 @@ val_t partial_order___PartialOrder___length(val_t p0){
   stack_frame_head = fra.me.prev;
   return REGB0;
 }
+val_t partial_order___PartialOrder___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_partial_order;
+  fra.me.line = 39;
+  fra.me.meth = LOCATE_partial_order___PartialOrder___first;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./metamodel//partial_order.nit:39 */
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____elements_list(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_elements_list", LOCATE_partial_order, 39);
+  }
+  fra.me.REG[0] = ATTR_partial_order___PartialOrder____elements_list(fra.me.REG[0]);
+  fra.me.REG[0] = CALL_abstract_collection___Collection___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 partial_order___PartialOrder___has(val_t p0, val_t p1){
   struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
   val_t REGB0;
@@ -95,13 +111,11 @@ val_t partial_order___PartialOrder___has(val_t p0, val_t p1){
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____elements(fra.me.REG[0])!=NIT_NULL);
   /* ./metamodel//partial_order.nit:41 */
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____elements(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Uninitialized attribute %s", "_elements");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 41);
-    nit_exit(1);
+    nit_abort("Uninitialized attribute %s", "_elements", LOCATE_partial_order, 41);
   }
   fra.me.REG[0] = ATTR_partial_order___PartialOrder____elements(fra.me.REG[0]);
   REGB0 = CALL_abstract_collection___MapRead___has_key(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
@@ -127,13 +141,11 @@ val_t partial_order___PartialOrder___has_only(val_t p0, val_t p1){
   fra.me.REG[2] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____elements(fra.me.REG[0])!=NIT_NULL);
   /* ./metamodel//partial_order.nit:43 */
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____elements(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Uninitialized attribute %s", "_elements");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 43);
-    nit_exit(1);
+    nit_abort("Uninitialized attribute %s", "_elements", LOCATE_partial_order, 43);
   }
   fra.me.REG[2] = ATTR_partial_order___PartialOrder____elements(fra.me.REG[0]);
   REGB0 = CALL_abstract_collection___Collection___length(fra.me.REG[2])(fra.me.REG[2]);
@@ -141,21 +153,20 @@ val_t partial_order___PartialOrder___has_only(val_t p0, val_t p1){
   REGB2 = TAG_Bool(IS_EQUAL_OO(REGB0,REGB1));
   if (UNTAG_Bool(REGB2)) {
   } else {
+    /* ./../lib/standard//kernel.nit:207 */
     REGB1 = TAG_Bool((REGB0)==(REGB1));
+    /* ./metamodel//partial_order.nit:43 */
     REGB2 = REGB1;
-  /* ./metamodel//partial_order.nit:43 */
   }
   if (UNTAG_Bool(REGB2)) {
     REGB2 = TAG_Bool(ATTR_partial_order___PartialOrder____elements(fra.me.REG[0])!=NIT_NULL);
     if (UNTAG_Bool(REGB2)) {
     } else {
-      fprintf(stderr, "Uninitialized attribute %s", "_elements");
-      fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 43);
-      nit_exit(1);
+      nit_abort("Uninitialized attribute %s", "_elements", LOCATE_partial_order, 43);
     }
     fra.me.REG[0] = ATTR_partial_order___PartialOrder____elements(fra.me.REG[0]);
     fra.me.REG[0] = CALL_abstract_collection___Collection___first(fra.me.REG[0])(fra.me.REG[0]);
-    REGB2 = TAG_Bool(IS_EQUAL_NN(fra.me.REG[0],fra.me.REG[1]));
+    REGB2 = TAG_Bool(IS_EQUAL_ON(fra.me.REG[1],fra.me.REG[0]));
     if (UNTAG_Bool(REGB2)) {
     } else {
       REGB1 = TAG_Bool(fra.me.REG[0]==NIT_NULL);
@@ -191,73 +202,47 @@ val_t partial_order___PartialOrder___count(val_t p0, val_t p1){
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  REGB0 = CALL_abstract_collection___Collection___has(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
   /* ./metamodel//partial_order.nit:47 */
+  REGB0 = CALL_abstract_collection___Collection___has(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
   if (UNTAG_Bool(REGB0)) {
-    REGB0 = TAG_Int(1);
     /* ./metamodel//partial_order.nit:48 */
+    REGB0 = TAG_Int(1);
     goto label1;
   } else {
+    /* ./metamodel//partial_order.nit:50 */
     REGB1 = TAG_Int(0);
     REGB0 = REGB1;
-    /* ./metamodel//partial_order.nit:50 */
     goto label1;
   }
   label1: while(0);
   stack_frame_head = fra.me.prev;
   return REGB0;
 }
-val_t partial_order___PartialOrder___first(val_t p0){
+val_t partial_order___PartialOrder___iterator(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_partial_order;
-  fra.me.line = 39;
-  fra.me.meth = LOCATE_partial_order___PartialOrder___first;
+  fra.me.line = 54;
+  fra.me.meth = LOCATE_partial_order___PartialOrder___iterator;
   fra.me.has_broke = 0;
   fra.me.REG_size = 1;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[0] = p0;
+  /* ./metamodel//partial_order.nit:54 */
   REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____elements_list(fra.me.REG[0])!=NIT_NULL);
-  /* ./metamodel//partial_order.nit:39 */
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Uninitialized attribute %s", "_elements_list");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 39);
-    nit_exit(1);
+    nit_abort("Uninitialized attribute %s", "_elements_list", LOCATE_partial_order, 54);
   }
   fra.me.REG[0] = ATTR_partial_order___PartialOrder____elements_list(fra.me.REG[0]);
-  fra.me.REG[0] = CALL_abstract_collection___Collection___first(fra.me.REG[0])(fra.me.REG[0]);
+  fra.me.REG[0] = CALL_abstract_collection___Collection___iterator(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 partial_order___PartialOrder___roots(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_partial_order;
-  fra.me.line = 30;
-  fra.me.meth = LOCATE_partial_order___PartialOrder___roots;
-  fra.me.has_broke = 0;
-  fra.me.REG_size = 1;
-  fra.me.REG[0] = NIT_NULL;
-  fra.me.REG[0] = p0;
-  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____roots(fra.me.REG[0])!=NIT_NULL);
-  /* ./metamodel//partial_order.nit:30 */
-  if (UNTAG_Bool(REGB0)) {
-  } else {
-    fprintf(stderr, "Uninitialized attribute %s", "_roots");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 30);
-    nit_exit(1);
-  }
-  fra.me.REG[0] = ATTR_partial_order___PartialOrder____roots(fra.me.REG[0]);
-  stack_frame_head = fra.me.prev;
-  return fra.me.REG[0];
-}
 val_t partial_order___PartialOrder_____bra(val_t p0, val_t p1){
   struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
   val_t REGB0;
@@ -272,13 +257,11 @@ val_t partial_order___PartialOrder_____bra(val_t p0, val_t p1){
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____elements(fra.me.REG[0])!=NIT_NULL);
   /* ./metamodel//partial_order.nit:61 */
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____elements(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Uninitialized attribute %s", "_elements");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 61);
-    nit_exit(1);
+    nit_abort("Uninitialized attribute %s", "_elements", LOCATE_partial_order, 61);
   }
   fra.me.REG[0] = ATTR_partial_order___PartialOrder____elements(fra.me.REG[0]);
   fra.me.REG[1] = CALL_abstract_collection___MapRead_____bra(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
@@ -288,7 +271,7 @@ val_t partial_order___PartialOrder_____bra(val_t p0, val_t p1){
   return fra.me.REG[1];
 }
 val_t partial_order___PartialOrder___to_dot(val_t p0){
-  struct {struct stack_frame_t me; val_t MORE_REG[6];} fra;
+  struct {struct stack_frame_t me; val_t MORE_REG[2];} fra;
   val_t REGB0;
   val_t tmp;
   static val_t once_value_3; /* Once value */
@@ -297,78 +280,118 @@ val_t partial_order___PartialOrder___to_dot(val_t p0){
   fra.me.line = 64;
   fra.me.meth = LOCATE_partial_order___PartialOrder___to_dot;
   fra.me.has_broke = 0;
-  fra.me.REG_size = 7;
+  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[3] = NIT_NULL;
-  fra.me.REG[4] = NIT_NULL;
-  fra.me.REG[5] = NIT_NULL;
-  fra.me.REG[6] = NIT_NULL;
   fra.me.REG[0] = p0;
+  /* ./metamodel//partial_order.nit:67 */
   fra.me.REG[1] = NEW_Buffer_string___Buffer___init();
-  fra.me.REG[2] = CALL_partial_order___PartialOrder___to_dot_header(fra.me.REG[0])(fra.me.REG[0]);
   /* ./metamodel//partial_order.nit:68 */
+  fra.me.REG[2] = CALL_partial_order___PartialOrder___to_dot_header(fra.me.REG[0])(fra.me.REG[0]);
   CALL_abstract_collection___Sequence___append(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____elements(fra.me.REG[0])!=NIT_NULL);
   /* ./metamodel//partial_order.nit:69 */
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____elements(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Uninitialized attribute %s", "_elements");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 69);
-    nit_exit(1);
+    nit_abort("Uninitialized attribute %s", "_elements", LOCATE_partial_order, 69);
   }
   fra.me.REG[2] = ATTR_partial_order___PartialOrder____elements(fra.me.REG[0]);
-  fra.me.REG[2] = CALL_abstract_collection___Collection___iterator(fra.me.REG[2])(fra.me.REG[2]);
-  while(1) {
-    REGB0 = CALL_abstract_collection___Iterator___is_ok(fra.me.REG[2])(fra.me.REG[2]);
-    if (UNTAG_Bool(REGB0)) {
-      fra.me.REG[3] = CALL_abstract_collection___Iterator___item(fra.me.REG[2])(fra.me.REG[2]);
-      fra.me.REG[4] = CALL_partial_order___PartialOrderElement___value(fra.me.REG[3])(fra.me.REG[3]);
-      fra.me.REG[4] = CALL_partial_order___PartialOrder___to_dot_node(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[4]);
-      /* ./metamodel//partial_order.nit:70 */
-      CALL_abstract_collection___Sequence___append(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4]);
-      fra.me.REG[4] = CALL_partial_order___PartialOrderElement___direct_greaters(fra.me.REG[3])(fra.me.REG[3]);
-      fra.me.REG[4] = CALL_abstract_collection___Collection___iterator(fra.me.REG[4])(fra.me.REG[4]);
-      /* ./metamodel//partial_order.nit:71 */
-      while(1) {
-        REGB0 = CALL_abstract_collection___Iterator___is_ok(fra.me.REG[4])(fra.me.REG[4]);
-        if (UNTAG_Bool(REGB0)) {
-          fra.me.REG[5] = CALL_abstract_collection___Iterator___item(fra.me.REG[4])(fra.me.REG[4]);
-          fra.me.REG[6] = CALL_partial_order___PartialOrderElement___value(fra.me.REG[3])(fra.me.REG[3]);
-          fra.me.REG[5] = CALL_partial_order___PartialOrder___to_dot_edge(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[6], fra.me.REG[5]);
-          /* ./metamodel//partial_order.nit:72 */
-          CALL_abstract_collection___Sequence___append(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[5]);
-        } else {
-          /* ./metamodel//partial_order.nit:71 */
-          goto label1;
-        }
-        CALL_abstract_collection___Iterator___next(fra.me.REG[4])(fra.me.REG[4]);
-      }
-      label1: while(0);
-    } else {
-      /* ./metamodel//partial_order.nit:69 */
-      goto label2;
-    }
-    CALL_abstract_collection___Iterator___next(fra.me.REG[2])(fra.me.REG[2]);
-  }
-  label2: while(0);
+  CALL_abstract_collection___Collection___iterate(fra.me.REG[2])(fra.me.REG[2], (&(fra.me)), ((fun_t)OC_partial_order___PartialOrder___to_dot_1));
   /* ./metamodel//partial_order.nit:75 */
   if (!once_value_3) {
-    fra.me.REG[2] = BOX_NativeString("}\n");
+    fra.me.REG[0] = BOX_NativeString("}\n");
     REGB0 = TAG_Int(2);
-    fra.me.REG[2] = NEW_String_string___String___with_native(fra.me.REG[2], REGB0);
-    once_value_3 = fra.me.REG[2];
+    fra.me.REG[0] = NEW_String_string___String___with_native(fra.me.REG[0], REGB0);
+    once_value_3 = fra.me.REG[0];
     register_static_object(&once_value_3);
-  } else fra.me.REG[2] = once_value_3;
-  CALL_abstract_collection___Sequence___append(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  fra.me.REG[1] = CALL_string___Object___to_s(fra.me.REG[1])(fra.me.REG[1]);
+  } else fra.me.REG[0] = once_value_3;
+  fra.me.REG[0] = fra.me.REG[0];
+  CALL_abstract_collection___Sequence___append(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
   /* ./metamodel//partial_order.nit:76 */
+  fra.me.REG[1] = CALL_string___Object___to_s(fra.me.REG[1])(fra.me.REG[1]);
   goto label4;
   label4: while(0);
   stack_frame_head = fra.me.prev;
   return fra.me.REG[1];
 }
+  void OC_partial_order___PartialOrder___to_dot_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; val_t MORE_REG[4];} fra;
+    val_t REGB0;
+    val_t REGB1;
+    fun_t CREG[1];
+    val_t tmp;
+    fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+    fra.me.file = LOCATE_partial_order;
+    fra.me.line = 0;
+    fra.me.meth = LOCATE_partial_order___PartialOrder___to_dot;
+    fra.me.has_broke = 0;
+    fra.me.REG_size = 5;
+    fra.me.REG[0] = NIT_NULL;
+    fra.me.REG[1] = NIT_NULL;
+    fra.me.REG[2] = NIT_NULL;
+    fra.me.REG[3] = NIT_NULL;
+    fra.me.REG[4] = NIT_NULL;
+    fra.me.closure_ctx = closctx_param;
+    fra.me.closure_funs = CREG;
+    fra.me.REG[0] = p0;
+    CREG[0] = clos_fun0;
+    /* ./metamodel//partial_order.nit:70 */
+    fra.me.REG[1] = CALL_partial_order___PartialOrderElement___value(fra.me.REG[0])(fra.me.REG[0]);
+    fra.me.REG[1] = CALL_partial_order___PartialOrder___to_dot_node(closctx->REG[0])(closctx->REG[0], fra.me.REG[1]);
+    CALL_abstract_collection___Sequence___append(closctx->REG[1])(closctx->REG[1], fra.me.REG[1]);
+    /* ./metamodel//partial_order.nit:71 */
+    fra.me.REG[1] = CALL_partial_order___PartialOrderElement___direct_greaters(fra.me.REG[0])(fra.me.REG[0]);
+    /* ./../lib/standard//collection//array.nit:234 */
+    REGB0 = TAG_Int(0);
+    /* ./../lib/standard//collection//array.nit:235 */
+    REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[1])!=NIT_NULL);
+    if (UNTAG_Bool(REGB1)) {
+    } else {
+      nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 235);
+    }
+    REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[1]);
+    /* ./../lib/standard//collection//array.nit:236 */
+    fra.me.REG[2] = ATTR_array___Array____items(fra.me.REG[1]);
+    /* ./../lib/standard//collection//array.nit:237 */
+    while(1) {
+      /* ./../lib/standard//collection//array.nit:23 */
+      REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[1])!=NIT_NULL);
+      if (UNTAG_Bool(REGB1)) {
+      } else {
+        nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+      }
+      REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[1]);
+      /* ./../lib/standard//kernel.nit:212 */
+      REGB1 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB1));
+      /* ./../lib/standard//collection//array.nit:237 */
+      if (UNTAG_Bool(REGB1)) {
+        /* ./../lib/standard//collection//array.nit:238 */
+        REGB1 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
+        if (UNTAG_Bool(REGB1)) {
+          nit_abort("Reciever is null", NULL, LOCATE_array, 238);
+        }
+        /* ./../lib/standard//collection//array.nit:654 */
+        fra.me.REG[3] = ((Nit_NativeArray)fra.me.REG[2])->val[UNTAG_Int(REGB0)];
+        /* ./metamodel//partial_order.nit:72 */
+        fra.me.REG[4] = CALL_partial_order___PartialOrderElement___value(fra.me.REG[0])(fra.me.REG[0]);
+        fra.me.REG[3] = CALL_partial_order___PartialOrder___to_dot_edge(closctx->REG[0])(closctx->REG[0], fra.me.REG[4], fra.me.REG[3]);
+        CALL_abstract_collection___Sequence___append(closctx->REG[1])(closctx->REG[1], fra.me.REG[3]);
+        /* ./../lib/standard//collection//array.nit:239 */
+        REGB1 = TAG_Int(1);
+        /* ./../lib/standard//kernel.nit:215 */
+        REGB1 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB1));
+        /* ./../lib/standard//collection//array.nit:239 */
+        REGB0 = REGB1;
+      } else {
+        /* ./../lib/standard//collection//array.nit:237 */
+        goto label2;
+      }
+    }
+    label2: while(0);
+    stack_frame_head = fra.me.prev;
+    return;
+  }
 val_t partial_order___PartialOrder___to_dot_header(val_t p0){
   struct {struct stack_frame_t me;} fra;
   val_t REGB0;
@@ -390,6 +413,7 @@ val_t partial_order___PartialOrder___to_dot_header(val_t p0){
     once_value_1 = fra.me.REG[0];
     register_static_object(&once_value_1);
   } else fra.me.REG[0] = once_value_1;
+  fra.me.REG[0] = fra.me.REG[0];
   goto label2;
   label2: while(0);
   stack_frame_head = fra.me.prev;
@@ -412,9 +436,9 @@ val_t partial_order___PartialOrder___to_dot_node(val_t p0, val_t p1){
   fra.me.REG[2] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
+  /* ./metamodel//partial_order.nit:88 */
   REGB0 = TAG_Int(3);
   fra.me.REG[0] = NEW_Array_array___Array___with_capacity(REGB0);
-  /* ./metamodel//partial_order.nit:88 */
   if (!once_value_1) {
     fra.me.REG[2] = BOX_NativeString("\"");
     REGB0 = TAG_Int(1);
@@ -422,9 +446,10 @@ val_t partial_order___PartialOrder___to_dot_node(val_t p0, val_t p1){
     once_value_1 = fra.me.REG[2];
     register_static_object(&once_value_1);
   } else fra.me.REG[2] = once_value_1;
-  array___Array___add(fra.me.REG[0], fra.me.REG[2]);
+  fra.me.REG[2] = fra.me.REG[2];
+  CALL_abstract_collection___SimpleCollection___add(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[2]);
   fra.me.REG[1] = CALL_string___Object___to_s(fra.me.REG[1])(fra.me.REG[1]);
-  array___Array___add(fra.me.REG[0], fra.me.REG[1]);
+  CALL_abstract_collection___SimpleCollection___add(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
   if (!once_value_2) {
     fra.me.REG[1] = BOX_NativeString("\";\n");
     REGB0 = TAG_Int(3);
@@ -432,7 +457,8 @@ val_t partial_order___PartialOrder___to_dot_node(val_t p0, val_t p1){
     once_value_2 = fra.me.REG[1];
     register_static_object(&once_value_2);
   } else fra.me.REG[1] = once_value_2;
-  array___Array___add(fra.me.REG[0], fra.me.REG[1]);
+  fra.me.REG[1] = fra.me.REG[1];
+  CALL_abstract_collection___SimpleCollection___add(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
   fra.me.REG[0] = CALL_string___Object___to_s(fra.me.REG[0])(fra.me.REG[0]);
   goto label3;
   label3: while(0);
@@ -459,9 +485,9 @@ val_t partial_order___PartialOrder___to_dot_edge(val_t p0, val_t p1, val_t p2){
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
   fra.me.REG[2] = p2;
+  /* ./metamodel//partial_order.nit:94 */
   REGB0 = TAG_Int(5);
   fra.me.REG[0] = NEW_Array_array___Array___with_capacity(REGB0);
-  /* ./metamodel//partial_order.nit:94 */
   if (!once_value_1) {
     fra.me.REG[3] = BOX_NativeString("\"");
     REGB0 = TAG_Int(1);
@@ -469,9 +495,10 @@ val_t partial_order___PartialOrder___to_dot_edge(val_t p0, val_t p1, val_t p2){
     once_value_1 = fra.me.REG[3];
     register_static_object(&once_value_1);
   } else fra.me.REG[3] = once_value_1;
-  array___Array___add(fra.me.REG[0], fra.me.REG[3]);
+  fra.me.REG[3] = fra.me.REG[3];
+  CALL_abstract_collection___SimpleCollection___add(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[3]);
   fra.me.REG[1] = CALL_string___Object___to_s(fra.me.REG[1])(fra.me.REG[1]);
-  array___Array___add(fra.me.REG[0], fra.me.REG[1]);
+  CALL_abstract_collection___SimpleCollection___add(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
   if (!once_value_2) {
     fra.me.REG[1] = BOX_NativeString("\" -> \"");
     REGB0 = TAG_Int(6);
@@ -479,9 +506,10 @@ val_t partial_order___PartialOrder___to_dot_edge(val_t p0, val_t p1, val_t p2){
     once_value_2 = fra.me.REG[1];
     register_static_object(&once_value_2);
   } else fra.me.REG[1] = once_value_2;
-  array___Array___add(fra.me.REG[0], fra.me.REG[1]);
+  fra.me.REG[1] = fra.me.REG[1];
+  CALL_abstract_collection___SimpleCollection___add(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
   fra.me.REG[2] = CALL_string___Object___to_s(fra.me.REG[2])(fra.me.REG[2]);
-  array___Array___add(fra.me.REG[0], fra.me.REG[2]);
+  CALL_abstract_collection___SimpleCollection___add(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[2]);
   if (!once_value_3) {
     fra.me.REG[2] = BOX_NativeString("\";\n");
     REGB0 = TAG_Int(3);
@@ -489,7 +517,8 @@ val_t partial_order___PartialOrder___to_dot_edge(val_t p0, val_t p1, val_t p2){
     once_value_3 = fra.me.REG[2];
     register_static_object(&once_value_3);
   } else fra.me.REG[2] = once_value_3;
-  array___Array___add(fra.me.REG[0], fra.me.REG[2]);
+  fra.me.REG[2] = fra.me.REG[2];
+  CALL_abstract_collection___SimpleCollection___add(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[2]);
   fra.me.REG[0] = CALL_string___Object___to_s(fra.me.REG[0])(fra.me.REG[0]);
   goto label4;
   label4: while(0);
@@ -497,7 +526,7 @@ val_t partial_order___PartialOrder___to_dot_edge(val_t p0, val_t p1, val_t p2){
   return fra.me.REG[0];
 }
 val_t partial_order___PartialOrder___select_smallests(val_t p0, val_t p1){
-  struct {struct stack_frame_t me; val_t MORE_REG[5];} fra;
+  struct {struct stack_frame_t me; val_t MORE_REG[4];} fra;
   val_t REGB0;
   val_t REGB1;
   val_t tmp;
@@ -506,17 +535,16 @@ val_t partial_order___PartialOrder___select_smallests(val_t p0, val_t p1){
   fra.me.line = 97;
   fra.me.meth = LOCATE_partial_order___PartialOrder___select_smallests;
   fra.me.has_broke = 0;
-  fra.me.REG_size = 6;
+  fra.me.REG_size = 5;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
   fra.me.REG[3] = NIT_NULL;
   fra.me.REG[4] = NIT_NULL;
-  fra.me.REG[5] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  REGB0 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
   /* ./metamodel//partial_order.nit:100 */
+  REGB0 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
     REGB1 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
@@ -532,60 +560,69 @@ val_t partial_order___PartialOrder___select_smallests(val_t p0, val_t p1){
     fra.me.REG[2] = NEW_Array_array___Array___init();
     goto label1;
   }
-  REGB0 = CALL_partial_order___PartialOrder___has_all(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
   /* ./metamodel//partial_order.nit:101 */
+  REGB0 = CALL_partial_order___PartialOrder___has_all(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Assert failed");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 101);
-    nit_exit(1);
+    nit_abort("Assert failed", NULL, LOCATE_partial_order, 101);
   }
-  REGB0 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
   /* ./metamodel//partial_order.nit:102 */
+  REGB0 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
-    fprintf(stderr, "Reciever is null");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 102);
-    nit_exit(1);
+    nit_abort("Reciever is null", NULL, LOCATE_partial_order, 102);
   }
   REGB0 = CALL_abstract_collection___Collection___length(fra.me.REG[1])(fra.me.REG[1]);
   fra.me.REG[3] = NEW_Array_array___Array___with_capacity(REGB0);
-  REGB0 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
   /* ./metamodel//partial_order.nit:103 */
+  REGB0 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
-    fprintf(stderr, "Reciever is null");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 103);
-    nit_exit(1);
+    nit_abort("Reciever is null", NULL, LOCATE_partial_order, 103);
   }
   REGB0 = CALL_abstract_collection___Collection___length(fra.me.REG[1])(fra.me.REG[1]);
   fra.me.REG[4] = NEW_Array_array___Array___with_capacity(REGB0);
-  fra.me.REG[1] = CALL_abstract_collection___Collection___iterator(fra.me.REG[1])(fra.me.REG[1]);
   /* ./metamodel//partial_order.nit:104 */
-  while(1) {
-    REGB0 = CALL_abstract_collection___Iterator___is_ok(fra.me.REG[1])(fra.me.REG[1]);
-    if (UNTAG_Bool(REGB0)) {
-      fra.me.REG[5] = CALL_abstract_collection___Iterator___item(fra.me.REG[1])(fra.me.REG[1]);
-      REGB0 = CALL_partial_order___PartialOrder___add_to_smallests(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[5], fra.me.REG[3], fra.me.REG[4]);
-      /* ./metamodel//partial_order.nit:107 */
-      if (UNTAG_Bool(REGB0)) {
-        fra.me.REG[5] = fra.me.REG[4];
-        fra.me.REG[4] = fra.me.REG[3];
-        fra.me.REG[3] = fra.me.REG[5];
-      /* ./metamodel//partial_order.nit:112 */
-      }
-    } else {
-      /* ./metamodel//partial_order.nit:104 */
-      goto label2;
-    }
-    CALL_abstract_collection___Iterator___next(fra.me.REG[1])(fra.me.REG[1]);
+  REGB0 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+    nit_abort("Reciever is null", NULL, LOCATE_partial_order, 104);
   }
-  label2: while(0);
-  fra.me.REG[2] = fra.me.REG[3];
+  CALL_abstract_collection___Collection___iterate(fra.me.REG[1])(fra.me.REG[1], (&(fra.me)), ((fun_t)OC_partial_order___PartialOrder___select_smallests_2));
   /* ./metamodel//partial_order.nit:115 */
+  fra.me.REG[2] = fra.me.REG[3];
   goto label1;
   label1: while(0);
   stack_frame_head = fra.me.prev;
   return fra.me.REG[2];
 }
+  void OC_partial_order___PartialOrder___select_smallests_2(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;
+    fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+    fra.me.file = LOCATE_partial_order;
+    fra.me.line = 0;
+    fra.me.meth = LOCATE_partial_order___PartialOrder___select_smallests;
+    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;
+    /* ./metamodel//partial_order.nit:106 */
+    REGB0 = CALL_partial_order___PartialOrder___add_to_smallests(closctx->REG[0])(closctx->REG[0], fra.me.REG[0], closctx->REG[3], closctx->REG[4]);
+    /* ./metamodel//partial_order.nit:107 */
+    if (UNTAG_Bool(REGB0)) {
+      /* ./metamodel//partial_order.nit:110 */
+      fra.me.REG[0] = closctx->REG[4];
+      /* ./metamodel//partial_order.nit:111 */
+      closctx->REG[4] = closctx->REG[3];
+      /* ./metamodel//partial_order.nit:112 */
+      closctx->REG[3] = fra.me.REG[0];
+    }
+    stack_frame_head = fra.me.prev;
+    return;
+  }
 val_t partial_order___PartialOrder___add(val_t p0, val_t p1, val_t p2){
   struct {struct stack_frame_t me; val_t MORE_REG[4];} fra;
   val_t REGB0;
@@ -605,17 +642,15 @@ val_t partial_order___PartialOrder___add(val_t p0, val_t p1, val_t p2){
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
   fra.me.REG[2] = p2;
+  /* ./metamodel//partial_order.nit:121 */
   REGB0 = CALL_abstract_collection___Collection___has(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
   REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
-  /* ./metamodel//partial_order.nit:121 */
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Assert failed");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 121);
-    nit_exit(1);
+    nit_abort("Assert failed", NULL, LOCATE_partial_order, 121);
   }
-  REGB0 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
   /* ./metamodel//partial_order.nit:122 */
+  REGB0 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
     REGB1 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
@@ -635,34 +670,30 @@ val_t partial_order___PartialOrder___add(val_t p0, val_t p1, val_t p2){
   }
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Assert failed");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 122);
-    nit_exit(1);
+    nit_abort("Assert failed", NULL, LOCATE_partial_order, 122);
   }
+  /* ./metamodel//partial_order.nit:123 */
   fra.me.REG[3] = CALL_partial_order___PartialOrder___select_smallests(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[2]);
+  /* ./metamodel//partial_order.nit:124 */
   fra.me.REG[3] = CALL_partial_order___PartialOrder___new_poe(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1], fra.me.REG[3]);
-  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____elements(fra.me.REG[0])!=NIT_NULL);
   /* ./metamodel//partial_order.nit:125 */
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____elements(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Uninitialized attribute %s", "_elements");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 125);
-    nit_exit(1);
+    nit_abort("Uninitialized attribute %s", "_elements", LOCATE_partial_order, 125);
   }
   fra.me.REG[4] = ATTR_partial_order___PartialOrder____elements(fra.me.REG[0]);
   CALL_abstract_collection___Map_____braeq(fra.me.REG[4])(fra.me.REG[4], fra.me.REG[1], fra.me.REG[3]);
-  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____elements_list(fra.me.REG[0])!=NIT_NULL);
   /* ./metamodel//partial_order.nit:126 */
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____elements_list(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Uninitialized attribute %s", "_elements_list");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 126);
-    nit_exit(1);
+    nit_abort("Uninitialized attribute %s", "_elements_list", LOCATE_partial_order, 126);
   }
   fra.me.REG[4] = ATTR_partial_order___PartialOrder____elements_list(fra.me.REG[0]);
-  array___Array___add(fra.me.REG[4], fra.me.REG[1]);
-  REGB0 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
+  CALL_abstract_collection___SimpleCollection___add(fra.me.REG[4])(fra.me.REG[4], fra.me.REG[1]);
   /* ./metamodel//partial_order.nit:127 */
+  REGB0 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
     REGB1 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
@@ -679,24 +710,20 @@ val_t partial_order___PartialOrder___add(val_t p0, val_t p1, val_t p2){
   } else {
     REGB1 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
     if (UNTAG_Bool(REGB1)) {
-      fprintf(stderr, "Reciever is null");
-      fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 127);
-      nit_exit(1);
+      nit_abort("Reciever is null", NULL, LOCATE_partial_order, 127);
     }
     REGB1 = CALL_abstract_collection___Collection___is_empty(fra.me.REG[2])(fra.me.REG[2]);
     REGB0 = REGB1;
   }
   if (UNTAG_Bool(REGB0)) {
-    REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____roots(fra.me.REG[0])!=NIT_NULL);
     /* ./metamodel//partial_order.nit:128 */
+    REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____roots(fra.me.REG[0])!=NIT_NULL);
     if (UNTAG_Bool(REGB0)) {
     } else {
-      fprintf(stderr, "Uninitialized attribute %s", "_roots");
-      fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 128);
-      nit_exit(1);
+      nit_abort("Uninitialized attribute %s", "_roots", LOCATE_partial_order, 128);
     }
     fra.me.REG[0] = ATTR_partial_order___PartialOrder____roots(fra.me.REG[0]);
-    array___Array___add(fra.me.REG[0], fra.me.REG[1]);
+    CALL_abstract_collection___SimpleCollection___add(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
   }
   /* ./metamodel//partial_order.nit:130 */
   goto label1;
@@ -705,50 +732,63 @@ val_t partial_order___PartialOrder___add(val_t p0, val_t p1, val_t p2){
   return fra.me.REG[3];
 }
 val_t partial_order___PartialOrder___has_all(val_t p0, val_t p1){
-  struct {struct stack_frame_t me; val_t MORE_REG[2];} fra;
+  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_partial_order;
   fra.me.line = 133;
   fra.me.meth = LOCATE_partial_order___PartialOrder___has_all;
   fra.me.has_broke = 0;
-  fra.me.REG_size = 3;
+  fra.me.REG_size = 2;
   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[1] = CALL_abstract_collection___Collection___iterator(fra.me.REG[1])(fra.me.REG[1]);
-  /* ./metamodel//partial_order.nit:136 */
-  while(1) {
-    REGB0 = CALL_abstract_collection___Iterator___is_ok(fra.me.REG[1])(fra.me.REG[1]);
-    if (UNTAG_Bool(REGB0)) {
-      fra.me.REG[2] = CALL_abstract_collection___Iterator___item(fra.me.REG[1])(fra.me.REG[1]);
-      REGB0 = CALL_abstract_collection___Collection___has(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[2]);
-      REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
-      /* ./metamodel//partial_order.nit:137 */
-      if (UNTAG_Bool(REGB0)) {
-        REGB0 = TAG_Bool(false);
-        /* ./metamodel//partial_order.nit:138 */
-        goto label1;
-      }
-    } else {
-      /* ./metamodel//partial_order.nit:136 */
-      goto label2;
-    }
-    CALL_abstract_collection___Iterator___next(fra.me.REG[1])(fra.me.REG[1]);
+  CALL_abstract_collection___Collection___iterate(fra.me.REG[1])(fra.me.REG[1], (&(fra.me)), ((fun_t)OC_partial_order___PartialOrder___has_all_1));
+  switch ((&(fra.me))->has_broke) {
+    case 0: break;
+    case 1: (&(fra.me))->has_broke = 0; goto label3;
   }
-  label2: while(0);
-  REGB1 = TAG_Bool(true);
-  REGB0 = REGB1;
   /* ./metamodel//partial_order.nit:141 */
-  goto label1;
-  label1: while(0);
+  REGB0 = TAG_Bool(true);
+  fra.me.REG[1] = REGB0;
+  goto label3;
+  label3: while(0);
   stack_frame_head = fra.me.prev;
-  return REGB0;
+  return fra.me.REG[1];
 }
+  void OC_partial_order___PartialOrder___has_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;
+    val_t REGB0;
+    fun_t CREG[1];
+    val_t tmp;
+    /* ./metamodel//partial_order.nit:136 */
+    fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+    fra.me.file = LOCATE_partial_order;
+    fra.me.line = 0;
+    fra.me.meth = LOCATE_partial_order___PartialOrder___has_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;
+    /* ./metamodel//partial_order.nit:137 */
+    REGB0 = CALL_abstract_collection___Collection___has(closctx->REG[0])(closctx->REG[0], fra.me.REG[0]);
+    REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
+    if (UNTAG_Bool(REGB0)) {
+      /* ./metamodel//partial_order.nit:138 */
+      REGB0 = TAG_Bool(false);
+      closctx->REG[1] = REGB0;
+      closctx->has_broke = 1;
+      goto label2;
+    }
+    label2: while(0);
+    stack_frame_head = fra.me.prev;
+    return;
+  }
 val_t partial_order___PartialOrder___new_poe(val_t p0, val_t p1, val_t p2){
   struct {struct stack_frame_t me; val_t MORE_REG[2];} fra;
   val_t tmp;
@@ -764,75 +804,108 @@ val_t partial_order___PartialOrder___new_poe(val_t p0, val_t p1, val_t p2){
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
   fra.me.REG[2] = p2;
-  fra.me.REG[2] = NEW_PartialOrderElement_partial_order___PartialOrderElement___init(fra.me.REG[0], fra.me.REG[1], fra.me.REG[2]);
   /* ./metamodel//partial_order.nit:147 */
+  fra.me.REG[2] = NEW_PartialOrderElement_partial_order___PartialOrderElement___init(fra.me.REG[0], fra.me.REG[1], fra.me.REG[2]);
   goto label1;
   label1: while(0);
   stack_frame_head = fra.me.prev;
   return fra.me.REG[2];
 }
 val_t partial_order___PartialOrder___add_to_smallests(val_t p0, val_t p1, val_t p2, val_t p3){
-  struct {struct stack_frame_t me; val_t MORE_REG[4];} fra;
+  struct {struct stack_frame_t me; val_t MORE_REG[5];} 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_partial_order;
   fra.me.line = 150;
   fra.me.meth = LOCATE_partial_order___PartialOrder___add_to_smallests;
   fra.me.has_broke = 0;
-  fra.me.REG_size = 5;
+  fra.me.REG_size = 6;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
   fra.me.REG[3] = NIT_NULL;
   fra.me.REG[4] = NIT_NULL;
+  fra.me.REG[5] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
   fra.me.REG[2] = p2;
   fra.me.REG[3] = p3;
   /* ./metamodel//partial_order.nit:157 */
   CALL_abstract_collection___RemovableCollection___clear(fra.me.REG[3])(fra.me.REG[3]);
+  /* ./metamodel//partial_order.nit:158 */
   fra.me.REG[0] = CALL_partial_order___PartialOrder_____bra(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
-  fra.me.REG[2] = CALL_abstract_collection___Collection___iterator(fra.me.REG[2])(fra.me.REG[2]);
-  /* ./metamodel//partial_order.nit:159 */
+  /* ./../lib/standard//collection//array.nit:234 */
+  REGB0 = TAG_Int(0);
+  /* ./../lib/standard//collection//array.nit:235 */
+  REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[2])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 235);
+  }
+  REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[2]);
+  /* ./../lib/standard//collection//array.nit:236 */
+  fra.me.REG[4] = ATTR_array___Array____items(fra.me.REG[2]);
+  /* ./../lib/standard//collection//array.nit:237 */
   while(1) {
-    REGB0 = CALL_abstract_collection___Iterator___is_ok(fra.me.REG[2])(fra.me.REG[2]);
-    if (UNTAG_Bool(REGB0)) {
-      fra.me.REG[4] = CALL_abstract_collection___Iterator___item(fra.me.REG[2])(fra.me.REG[2]);
-      REGB0 = CALL_partial_order___PartialOrderElement_____g(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[4]);
+    /* ./../lib/standard//collection//array.nit:23 */
+    REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[2])!=NIT_NULL);
+    if (UNTAG_Bool(REGB1)) {
+    } else {
+      nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+    }
+    REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[2]);
+    /* ./../lib/standard//kernel.nit:212 */
+    REGB1 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB1));
+    /* ./../lib/standard//collection//array.nit:237 */
+    if (UNTAG_Bool(REGB1)) {
+      /* ./../lib/standard//collection//array.nit:238 */
+      REGB1 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
+      if (UNTAG_Bool(REGB1)) {
+        nit_abort("Reciever is null", NULL, LOCATE_array, 238);
+      }
+      /* ./../lib/standard//collection//array.nit:654 */
+      fra.me.REG[5] = ((Nit_NativeArray)fra.me.REG[4])->val[UNTAG_Int(REGB0)];
       /* ./metamodel//partial_order.nit:160 */
-      if (UNTAG_Bool(REGB0)) {
-        REGB0 = TAG_Bool(false);
+      REGB1 = CALL_partial_order___PartialOrderElement_____g(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[5]);
+      if (UNTAG_Bool(REGB1)) {
         /* ./metamodel//partial_order.nit:161 */
+        REGB1 = TAG_Bool(false);
         goto label1;
       }
-      REGB1 = CALL_partial_order___PartialOrderElement_____l(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[4]);
-      REGB1 = TAG_Bool(!UNTAG_Bool(REGB1));
       /* ./metamodel//partial_order.nit:163 */
-      if (UNTAG_Bool(REGB1)) {
+      REGB2 = CALL_partial_order___PartialOrderElement_____l(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[5]);
+      REGB2 = TAG_Bool(!UNTAG_Bool(REGB2));
+      if (UNTAG_Bool(REGB2)) {
         /* ./metamodel//partial_order.nit:164 */
-        array___Array___add(fra.me.REG[3], fra.me.REG[4]);
+        CALL_abstract_collection___SimpleCollection___add(fra.me.REG[3])(fra.me.REG[3], fra.me.REG[5]);
       }
+      /* ./../lib/standard//collection//array.nit:239 */
+      REGB2 = TAG_Int(1);
+      /* ./../lib/standard//kernel.nit:215 */
+      REGB2 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB2));
+      /* ./../lib/standard//collection//array.nit:239 */
+      REGB0 = REGB2;
     } else {
-      /* ./metamodel//partial_order.nit:159 */
+      /* ./../lib/standard//collection//array.nit:237 */
       goto label2;
     }
-    CALL_abstract_collection___Iterator___next(fra.me.REG[2])(fra.me.REG[2]);
   }
   label2: while(0);
   /* ./metamodel//partial_order.nit:167 */
-  array___Array___add(fra.me.REG[3], fra.me.REG[1]);
-  REGB1 = TAG_Bool(true);
-  REGB0 = REGB1;
+  CALL_abstract_collection___SimpleCollection___add(fra.me.REG[3])(fra.me.REG[3], fra.me.REG[1]);
   /* ./metamodel//partial_order.nit:168 */
+  REGB0 = TAG_Bool(true);
+  REGB1 = REGB0;
   goto label1;
   label1: while(0);
   stack_frame_head = fra.me.prev;
-  return REGB0;
+  return REGB1;
 }
 void partial_order___PartialOrder___compute_smallers_for(val_t p0, val_t p1, val_t p2){
-  struct {struct stack_frame_t me; val_t MORE_REG[3];} fra;
+  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;
@@ -840,46 +913,52 @@ void partial_order___PartialOrder___compute_smallers_for(val_t p0, val_t p1, val
   fra.me.line = 171;
   fra.me.meth = LOCATE_partial_order___PartialOrder___compute_smallers_for;
   fra.me.has_broke = 0;
-  fra.me.REG_size = 4;
+  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[3] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
   fra.me.REG[2] = p2;
+  /* ./metamodel//partial_order.nit:173 */
   fra.me.REG[1] = CALL_partial_order___PartialOrderElement___value(fra.me.REG[1])(fra.me.REG[1]);
-  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____elements(fra.me.REG[0])!=NIT_NULL);
   /* ./metamodel//partial_order.nit:174 */
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrder____elements(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Uninitialized attribute %s", "_elements");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 174);
-    nit_exit(1);
+    nit_abort("Uninitialized attribute %s", "_elements", LOCATE_partial_order, 174);
   }
   fra.me.REG[0] = ATTR_partial_order___PartialOrder____elements(fra.me.REG[0]);
-  fra.me.REG[0] = CALL_abstract_collection___Collection___iterator(fra.me.REG[0])(fra.me.REG[0]);
-  while(1) {
-    REGB0 = CALL_abstract_collection___Iterator___is_ok(fra.me.REG[0])(fra.me.REG[0]);
-    if (UNTAG_Bool(REGB0)) {
-      fra.me.REG[3] = CALL_abstract_collection___Iterator___item(fra.me.REG[0])(fra.me.REG[0]);
-      REGB0 = CALL_partial_order___PartialOrderElement_____l(fra.me.REG[3])(fra.me.REG[3], fra.me.REG[1]);
-      /* ./metamodel//partial_order.nit:175 */
-      if (UNTAG_Bool(REGB0)) {
-        fra.me.REG[3] = CALL_partial_order___PartialOrderElement___value(fra.me.REG[3])(fra.me.REG[3]);
-        /* ./metamodel//partial_order.nit:176 */
-        CALL_abstract_collection___SimpleCollection___add(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[3]);
-      }
-    } else {
-      /* ./metamodel//partial_order.nit:174 */
-      goto label1;
-    }
-    CALL_abstract_collection___Iterator___next(fra.me.REG[0])(fra.me.REG[0]);
-  }
-  label1: while(0);
+  CALL_abstract_collection___Collection___iterate(fra.me.REG[0])(fra.me.REG[0], (&(fra.me)), ((fun_t)OC_partial_order___PartialOrder___compute_smallers_for_1));
   stack_frame_head = fra.me.prev;
   return;
 }
+  void OC_partial_order___PartialOrder___compute_smallers_for_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;
+    fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+    fra.me.file = LOCATE_partial_order;
+    fra.me.line = 0;
+    fra.me.meth = LOCATE_partial_order___PartialOrder___compute_smallers_for;
+    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;
+    /* ./metamodel//partial_order.nit:175 */
+    REGB0 = CALL_partial_order___PartialOrderElement_____l(fra.me.REG[0])(fra.me.REG[0], closctx->REG[1]);
+    if (UNTAG_Bool(REGB0)) {
+      /* ./metamodel//partial_order.nit:176 */
+      fra.me.REG[0] = CALL_partial_order___PartialOrderElement___value(fra.me.REG[0])(fra.me.REG[0]);
+      CALL_abstract_collection___SimpleCollection___add(closctx->REG[2])(closctx->REG[2], fra.me.REG[0]);
+    }
+    stack_frame_head = fra.me.prev;
+    return;
+  }
 void partial_order___PartialOrder___init(val_t p0, int* init_table){
   int itpos0 = VAL2OBJ(p0)->vft[INIT_TABLE_POS_PartialOrder].i;
   struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
@@ -894,14 +973,14 @@ void partial_order___PartialOrder___init(val_t p0, int* init_table){
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
-  fra.me.REG[1] = NEW_HashMap_hash_collection___HashMap___init();
   /* ./metamodel//partial_order.nit:183 */
+  fra.me.REG[1] = NEW_HashMap_hash_collection___HashMap___init();
   ATTR_partial_order___PartialOrder____elements(fra.me.REG[0]) = fra.me.REG[1];
-  fra.me.REG[1] = NEW_Array_array___Array___init();
   /* ./metamodel//partial_order.nit:184 */
-  ATTR_partial_order___PartialOrder____elements_list(fra.me.REG[0]) = fra.me.REG[1];
   fra.me.REG[1] = NEW_Array_array___Array___init();
+  ATTR_partial_order___PartialOrder____elements_list(fra.me.REG[0]) = fra.me.REG[1];
   /* ./metamodel//partial_order.nit:185 */
+  fra.me.REG[1] = NEW_Array_array___Array___init();
   ATTR_partial_order___PartialOrder____roots(fra.me.REG[0]) = fra.me.REG[1];
   stack_frame_head = fra.me.prev;
   init_table[itpos0] = 1;
@@ -919,13 +998,11 @@ val_t partial_order___PartialOrderElement___order(val_t p0){
   fra.me.REG_size = 1;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[0] = p0;
-  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____order(fra.me.REG[0])!=NIT_NULL);
   /* ./metamodel//partial_order.nit:190 */
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____order(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Uninitialized attribute %s", "_order");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 190);
-    nit_exit(1);
+    nit_abort("Uninitialized attribute %s", "_order", LOCATE_partial_order, 190);
   }
   fra.me.REG[0] = ATTR_partial_order___PartialOrderElement____order(fra.me.REG[0]);
   stack_frame_head = fra.me.prev;
@@ -933,6 +1010,7 @@ val_t partial_order___PartialOrderElement___order(val_t p0){
 }
 val_t partial_order___PartialOrderElement___value(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_partial_order;
@@ -942,8 +1020,13 @@ val_t partial_order___PartialOrderElement___value(val_t p0){
   fra.me.REG_size = 1;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[0] = p0;
-  fra.me.REG[0] = ATTR_partial_order___PartialOrderElement____value(fra.me.REG[0]);
   /* ./metamodel//partial_order.nit:193 */
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____value(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_value", LOCATE_partial_order, 193);
+  }
+  fra.me.REG[0] = ATTR_partial_order___PartialOrderElement____value(fra.me.REG[0]);
   stack_frame_head = fra.me.prev;
   return fra.me.REG[0];
 }
@@ -959,13 +1042,11 @@ val_t partial_order___PartialOrderElement___rank(val_t p0){
   fra.me.REG_size = 1;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[0] = p0;
-  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____rank(fra.me.REG[0])!=NIT_NULL);
   /* ./metamodel//partial_order.nit:196 */
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____rank(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Uninitialized attribute %s", "_rank");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 196);
-    nit_exit(1);
+    nit_abort("Uninitialized attribute %s", "_rank", LOCATE_partial_order, 196);
   }
   REGB0 = ATTR_partial_order___PartialOrderElement____rank(fra.me.REG[0]);
   stack_frame_head = fra.me.prev;
@@ -983,13 +1064,11 @@ val_t partial_order___PartialOrderElement___direct_greaters(val_t p0){
   fra.me.REG_size = 1;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[0] = p0;
-  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____direct_greaters(fra.me.REG[0])!=NIT_NULL);
   /* ./metamodel//partial_order.nit:202 */
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____direct_greaters(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Uninitialized attribute %s", "_direct_greaters");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 202);
-    nit_exit(1);
+    nit_abort("Uninitialized attribute %s", "_direct_greaters", LOCATE_partial_order, 202);
   }
   fra.me.REG[0] = ATTR_partial_order___PartialOrderElement____direct_greaters(fra.me.REG[0]);
   stack_frame_head = fra.me.prev;
@@ -1007,13 +1086,11 @@ val_t partial_order___PartialOrderElement___direct_smallers(val_t p0){
   fra.me.REG_size = 1;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[0] = p0;
-  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____direct_smallers(fra.me.REG[0])!=NIT_NULL);
   /* ./metamodel//partial_order.nit:205 */
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____direct_smallers(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Uninitialized attribute %s", "_direct_smallers");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 205);
-    nit_exit(1);
+    nit_abort("Uninitialized attribute %s", "_direct_smallers", LOCATE_partial_order, 205);
   }
   fra.me.REG[0] = ATTR_partial_order___PartialOrderElement____direct_smallers(fra.me.REG[0]);
   stack_frame_head = fra.me.prev;
@@ -1031,13 +1108,11 @@ val_t partial_order___PartialOrderElement___greaters(val_t p0){
   fra.me.REG_size = 1;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[0] = p0;
-  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____greaters(fra.me.REG[0])!=NIT_NULL);
   /* ./metamodel//partial_order.nit:208 */
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____greaters(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Uninitialized attribute %s", "_greaters");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 208);
-    nit_exit(1);
+    nit_abort("Uninitialized attribute %s", "_greaters", LOCATE_partial_order, 208);
   }
   fra.me.REG[0] = ATTR_partial_order___PartialOrderElement____greaters(fra.me.REG[0]);
   stack_frame_head = fra.me.prev;
@@ -1058,9 +1133,9 @@ val_t partial_order___PartialOrderElement___greaters_and_self(val_t p0){
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
   fra.me.REG[0] = p0;
+  /* ./metamodel//partial_order.nit:217 */
   fra.me.REG[1] = ATTR_partial_order___PartialOrderElement____greaters_and_self_cache(fra.me.REG[0]);
   REGB0 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
-  /* ./metamodel//partial_order.nit:217 */
   if (UNTAG_Bool(REGB0)) {
   } else {
     REGB1 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
@@ -1073,36 +1148,35 @@ val_t partial_order___PartialOrderElement___greaters_and_self(val_t p0){
     }
   }
   if (UNTAG_Bool(REGB0)) {
-    REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____greaters(fra.me.REG[0])!=NIT_NULL);
     /* ./metamodel//partial_order.nit:218 */
+    REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____greaters(fra.me.REG[0])!=NIT_NULL);
     if (UNTAG_Bool(REGB0)) {
     } else {
-      fprintf(stderr, "Uninitialized attribute %s", "_greaters");
-      fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 218);
-      nit_exit(1);
+      nit_abort("Uninitialized attribute %s", "_greaters", LOCATE_partial_order, 218);
     }
     fra.me.REG[1] = ATTR_partial_order___PartialOrderElement____greaters(fra.me.REG[0]);
     fra.me.REG[1] = CALL_array___Collection___to_a(fra.me.REG[1])(fra.me.REG[1]);
     ATTR_partial_order___PartialOrderElement____greaters_and_self_cache(fra.me.REG[0]) = fra.me.REG[1];
+    /* ./metamodel//partial_order.nit:219 */
     fra.me.REG[1] = ATTR_partial_order___PartialOrderElement____greaters_and_self_cache(fra.me.REG[0]);
+    REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____value(fra.me.REG[0])!=NIT_NULL);
+    if (UNTAG_Bool(REGB0)) {
+    } else {
+      nit_abort("Uninitialized attribute %s", "_value", LOCATE_partial_order, 219);
+    }
     fra.me.REG[2] = ATTR_partial_order___PartialOrderElement____value(fra.me.REG[0]);
     REGB0 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
-    /* ./metamodel//partial_order.nit:219 */
     if (UNTAG_Bool(REGB0)) {
-      fprintf(stderr, "Reciever is null");
-      fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 219);
-      nit_exit(1);
+      nit_abort("Reciever is null", NULL, LOCATE_partial_order, 219);
     }
-    array___Array___add(fra.me.REG[1], fra.me.REG[2]);
+    CALL_abstract_collection___SimpleCollection___add(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
   }
+  /* ./metamodel//partial_order.nit:221 */
   fra.me.REG[0] = ATTR_partial_order___PartialOrderElement____greaters_and_self_cache(fra.me.REG[0]);
   REGB0 = TAG_Bool(fra.me.REG[0]!=NIT_NULL);
-  /* ./metamodel//partial_order.nit:221 */
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Cast failed");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 221);
-    nit_exit(1);
+    nit_abort("Cast failed", NULL, LOCATE_partial_order, 221);
   }
   goto label1;
   label1: while(0);
@@ -1124,64 +1198,53 @@ val_t partial_order___PartialOrderElement___smallers(val_t p0){
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
   fra.me.REG[0] = p0;
-  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____smallers_last_length(fra.me.REG[0])!=NIT_NULL);
   /* ./metamodel//partial_order.nit:233 */
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____smallers_last_length(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Uninitialized attribute %s", "_smallers_last_length");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 233);
-    nit_exit(1);
+    nit_abort("Uninitialized attribute %s", "_smallers_last_length", LOCATE_partial_order, 233);
   }
   REGB0 = ATTR_partial_order___PartialOrderElement____smallers_last_length(fra.me.REG[0]);
   REGB1 = TAG_Bool(ATTR_partial_order___PartialOrderElement____order(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB1)) {
   } else {
-    fprintf(stderr, "Uninitialized attribute %s", "_order");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 233);
-    nit_exit(1);
+    nit_abort("Uninitialized attribute %s", "_order", LOCATE_partial_order, 233);
   }
   fra.me.REG[1] = ATTR_partial_order___PartialOrderElement____order(fra.me.REG[0]);
   REGB1 = CALL_abstract_collection___Collection___length(fra.me.REG[1])(fra.me.REG[1]);
+  /* ./../lib/standard//kernel.nit:212 */
   REGB1 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB1));
   /* ./metamodel//partial_order.nit:233 */
   if (UNTAG_Bool(REGB1)) {
-    REGB1 = TAG_Bool(ATTR_partial_order___PartialOrderElement____order(fra.me.REG[0])!=NIT_NULL);
     /* ./metamodel//partial_order.nit:234 */
+    REGB1 = TAG_Bool(ATTR_partial_order___PartialOrderElement____order(fra.me.REG[0])!=NIT_NULL);
     if (UNTAG_Bool(REGB1)) {
     } else {
-      fprintf(stderr, "Uninitialized attribute %s", "_order");
-      fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 234);
-      nit_exit(1);
+      nit_abort("Uninitialized attribute %s", "_order", LOCATE_partial_order, 234);
     }
     fra.me.REG[1] = ATTR_partial_order___PartialOrderElement____order(fra.me.REG[0]);
     REGB1 = TAG_Bool(ATTR_partial_order___PartialOrderElement____smallers_cache(fra.me.REG[0])!=NIT_NULL);
     if (UNTAG_Bool(REGB1)) {
     } else {
-      fprintf(stderr, "Uninitialized attribute %s", "_smallers_cache");
-      fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 234);
-      nit_exit(1);
+      nit_abort("Uninitialized attribute %s", "_smallers_cache", LOCATE_partial_order, 234);
     }
     fra.me.REG[2] = ATTR_partial_order___PartialOrderElement____smallers_cache(fra.me.REG[0]);
     CALL_partial_order___PartialOrder___compute_smallers_for(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0], fra.me.REG[2]);
-    REGB1 = TAG_Bool(ATTR_partial_order___PartialOrderElement____order(fra.me.REG[0])!=NIT_NULL);
     /* ./metamodel//partial_order.nit:235 */
+    REGB1 = TAG_Bool(ATTR_partial_order___PartialOrderElement____order(fra.me.REG[0])!=NIT_NULL);
     if (UNTAG_Bool(REGB1)) {
     } else {
-      fprintf(stderr, "Uninitialized attribute %s", "_order");
-      fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 235);
-      nit_exit(1);
+      nit_abort("Uninitialized attribute %s", "_order", LOCATE_partial_order, 235);
     }
     fra.me.REG[2] = ATTR_partial_order___PartialOrderElement____order(fra.me.REG[0]);
     REGB1 = CALL_abstract_collection___Collection___length(fra.me.REG[2])(fra.me.REG[2]);
     ATTR_partial_order___PartialOrderElement____smallers_last_length(fra.me.REG[0]) = REGB1;
   }
-  REGB1 = TAG_Bool(ATTR_partial_order___PartialOrderElement____smallers_cache(fra.me.REG[0])!=NIT_NULL);
   /* ./metamodel//partial_order.nit:237 */
+  REGB1 = TAG_Bool(ATTR_partial_order___PartialOrderElement____smallers_cache(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB1)) {
   } else {
-    fprintf(stderr, "Uninitialized attribute %s", "_smallers_cache");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 237);
-    nit_exit(1);
+    nit_abort("Uninitialized attribute %s", "_smallers_cache", LOCATE_partial_order, 237);
   }
   fra.me.REG[0] = ATTR_partial_order___PartialOrderElement____smallers_cache(fra.me.REG[0]);
   goto label1;
@@ -1190,16 +1253,17 @@ val_t partial_order___PartialOrderElement___smallers(val_t p0){
   return fra.me.REG[0];
 }
 val_t partial_order___PartialOrderElement___linear_extension(val_t p0){
-  struct {struct stack_frame_t me; val_t MORE_REG[6];} fra;
+  struct {struct stack_frame_t me; val_t MORE_REG[8];} 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_partial_order;
   fra.me.line = 243;
   fra.me.meth = LOCATE_partial_order___PartialOrderElement___linear_extension;
   fra.me.has_broke = 0;
-  fra.me.REG_size = 7;
+  fra.me.REG_size = 9;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -1207,10 +1271,12 @@ val_t partial_order___PartialOrderElement___linear_extension(val_t p0){
   fra.me.REG[4] = NIT_NULL;
   fra.me.REG[5] = NIT_NULL;
   fra.me.REG[6] = NIT_NULL;
+  fra.me.REG[7] = NIT_NULL;
+  fra.me.REG[8] = NIT_NULL;
   fra.me.REG[0] = p0;
+  /* ./metamodel//partial_order.nit:247 */
   fra.me.REG[1] = ATTR_partial_order___PartialOrderElement____linear_extension_cache(fra.me.REG[0]);
   REGB0 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
-  /* ./metamodel//partial_order.nit:247 */
   if (UNTAG_Bool(REGB0)) {
   } else {
     REGB1 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
@@ -1223,66 +1289,132 @@ val_t partial_order___PartialOrderElement___linear_extension(val_t p0){
     }
   }
   if (UNTAG_Bool(REGB0)) {
+    /* ./metamodel//partial_order.nit:248 */
     fra.me.REG[1] = NEW_Array_array___Array___init();
+    /* ./metamodel//partial_order.nit:249 */
     fra.me.REG[2] = NEW_Array_array___Array___init();
-    fra.me.REG[3] = CALL_partial_order___PartialOrderElement___value(fra.me.REG[0])(fra.me.REG[0]);
     /* ./metamodel//partial_order.nit:250 */
-    array___Array___add(fra.me.REG[1], fra.me.REG[3]);
-    fra.me.REG[3] = CALL_partial_order___PartialOrderElement___direct_greaters(fra.me.REG[0])(fra.me.REG[0]);
-    fra.me.REG[3] = CALL_abstract_collection___Collection___iterator(fra.me.REG[3])(fra.me.REG[3]);
+    fra.me.REG[3] = CALL_partial_order___PartialOrderElement___value(fra.me.REG[0])(fra.me.REG[0]);
+    CALL_abstract_collection___SimpleCollection___add(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
     /* ./metamodel//partial_order.nit:251 */
+    fra.me.REG[3] = CALL_partial_order___PartialOrderElement___direct_greaters(fra.me.REG[0])(fra.me.REG[0]);
+    /* ./../lib/standard//collection//array.nit:234 */
+    REGB0 = TAG_Int(0);
+    /* ./../lib/standard//collection//array.nit:235 */
+    REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[3])!=NIT_NULL);
+    if (UNTAG_Bool(REGB1)) {
+    } else {
+      nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 235);
+    }
+    REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[3]);
+    /* ./../lib/standard//collection//array.nit:236 */
+    fra.me.REG[4] = ATTR_array___Array____items(fra.me.REG[3]);
+    /* ./../lib/standard//collection//array.nit:237 */
     while(1) {
-      REGB0 = CALL_abstract_collection___Iterator___is_ok(fra.me.REG[3])(fra.me.REG[3]);
-      if (UNTAG_Bool(REGB0)) {
-        fra.me.REG[4] = CALL_abstract_collection___Iterator___item(fra.me.REG[3])(fra.me.REG[3]);
-        fra.me.REG[5] = CALL_partial_order___PartialOrderElement___order(fra.me.REG[0])(fra.me.REG[0]);
-        fra.me.REG[4] = CALL_partial_order___PartialOrder_____bra(fra.me.REG[5])(fra.me.REG[5], fra.me.REG[4]);
-        fra.me.REG[4] = CALL_partial_order___PartialOrderElement___linear_extension(fra.me.REG[4])(fra.me.REG[4]);
+      /* ./../lib/standard//collection//array.nit:23 */
+      REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[3])!=NIT_NULL);
+      if (UNTAG_Bool(REGB1)) {
+      } else {
+        nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+      }
+      REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[3]);
+      /* ./../lib/standard//kernel.nit:212 */
+      REGB1 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB1));
+      /* ./../lib/standard//collection//array.nit:237 */
+      if (UNTAG_Bool(REGB1)) {
+        /* ./../lib/standard//collection//array.nit:238 */
+        REGB1 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
+        if (UNTAG_Bool(REGB1)) {
+          nit_abort("Reciever is null", NULL, LOCATE_array, 238);
+        }
+        /* ./../lib/standard//collection//array.nit:654 */
+        fra.me.REG[5] = ((Nit_NativeArray)fra.me.REG[4])->val[UNTAG_Int(REGB0)];
+        /* ./metamodel//partial_order.nit:252 */
+        fra.me.REG[6] = CALL_partial_order___PartialOrderElement___order(fra.me.REG[0])(fra.me.REG[0]);
+        fra.me.REG[5] = CALL_partial_order___PartialOrder_____bra(fra.me.REG[6])(fra.me.REG[6], fra.me.REG[5]);
+        fra.me.REG[5] = CALL_partial_order___PartialOrderElement___linear_extension(fra.me.REG[5])(fra.me.REG[5]);
         /* ./metamodel//partial_order.nit:253 */
         CALL_abstract_collection___RemovableCollection___clear(fra.me.REG[2])(fra.me.REG[2]);
-        fra.me.REG[5] = CALL_abstract_collection___Collection___iterator(fra.me.REG[1])(fra.me.REG[1]);
-        /* ./metamodel//partial_order.nit:254 */
+        /* ./../lib/standard//collection//array.nit:231 */
+        fra.me.REG[6] = fra.me.REG[1];
+        /* ./../lib/standard//collection//array.nit:234 */
+        REGB1 = TAG_Int(0);
+        /* ./../lib/standard//collection//array.nit:235 */
+        REGB2 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[6])!=NIT_NULL);
+        if (UNTAG_Bool(REGB2)) {
+        } else {
+          nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 235);
+        }
+        REGB2 = ATTR_array___AbstractArrayRead____length(fra.me.REG[6]);
+        /* ./../lib/standard//collection//array.nit:236 */
+        fra.me.REG[7] = ATTR_array___Array____items(fra.me.REG[6]);
+        /* ./../lib/standard//collection//array.nit:237 */
         while(1) {
-          REGB0 = CALL_abstract_collection___Iterator___is_ok(fra.me.REG[5])(fra.me.REG[5]);
-          if (UNTAG_Bool(REGB0)) {
-            fra.me.REG[6] = CALL_abstract_collection___Iterator___item(fra.me.REG[5])(fra.me.REG[5]);
-            REGB0 = CALL_abstract_collection___Collection___has(fra.me.REG[4])(fra.me.REG[4], fra.me.REG[6]);
-            REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
+          /* ./../lib/standard//collection//array.nit:23 */
+          REGB2 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[6])!=NIT_NULL);
+          if (UNTAG_Bool(REGB2)) {
+          } else {
+            nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+          }
+          REGB2 = ATTR_array___AbstractArrayRead____length(fra.me.REG[6]);
+          /* ./../lib/standard//kernel.nit:212 */
+          REGB2 = TAG_Bool(UNTAG_Int(REGB1)<UNTAG_Int(REGB2));
+          /* ./../lib/standard//collection//array.nit:237 */
+          if (UNTAG_Bool(REGB2)) {
+            /* ./../lib/standard//collection//array.nit:238 */
+            REGB2 = TAG_Bool(fra.me.REG[7]==NIT_NULL);
+            if (UNTAG_Bool(REGB2)) {
+              nit_abort("Reciever is null", NULL, LOCATE_array, 238);
+            }
+            /* ./../lib/standard//collection//array.nit:654 */
+            fra.me.REG[8] = ((Nit_NativeArray)fra.me.REG[7])->val[UNTAG_Int(REGB1)];
             /* ./metamodel//partial_order.nit:255 */
-            if (UNTAG_Bool(REGB0)) {
-              array___Array___add(fra.me.REG[2], fra.me.REG[6]);
+            REGB2 = CALL_abstract_collection___Collection___has(fra.me.REG[5])(fra.me.REG[5], fra.me.REG[8]);
+            REGB2 = TAG_Bool(!UNTAG_Bool(REGB2));
+            if (UNTAG_Bool(REGB2)) {
+              CALL_abstract_collection___SimpleCollection___add(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[8]);
             }
+            /* ./../lib/standard//collection//array.nit:239 */
+            REGB2 = TAG_Int(1);
+            /* ./../lib/standard//kernel.nit:215 */
+            REGB2 = TAG_Int(UNTAG_Int(REGB1)+UNTAG_Int(REGB2));
+            /* ./../lib/standard//collection//array.nit:239 */
+            REGB1 = REGB2;
           } else {
-            /* ./metamodel//partial_order.nit:254 */
+            /* ./../lib/standard//collection//array.nit:237 */
             goto label1;
           }
-          CALL_abstract_collection___Iterator___next(fra.me.REG[5])(fra.me.REG[5]);
         }
         label1: while(0);
         /* ./metamodel//partial_order.nit:257 */
-        CALL_abstract_collection___Sequence___append(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[4]);
-        fra.me.REG[4] = fra.me.REG[1];
+        CALL_abstract_collection___Sequence___append(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[5]);
+        /* ./metamodel//partial_order.nit:259 */
+        fra.me.REG[5] = fra.me.REG[1];
+        /* ./metamodel//partial_order.nit:260 */
         fra.me.REG[1] = fra.me.REG[2];
-        fra.me.REG[2] = fra.me.REG[4];
-      /* ./metamodel//partial_order.nit:261 */
+        /* ./metamodel//partial_order.nit:261 */
+        fra.me.REG[2] = fra.me.REG[5];
+        /* ./../lib/standard//collection//array.nit:239 */
+        REGB1 = TAG_Int(1);
+        /* ./../lib/standard//kernel.nit:215 */
+        REGB1 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB1));
+        /* ./../lib/standard//collection//array.nit:239 */
+        REGB0 = REGB1;
       } else {
-        /* ./metamodel//partial_order.nit:251 */
+        /* ./../lib/standard//collection//array.nit:237 */
         goto label2;
       }
-      CALL_abstract_collection___Iterator___next(fra.me.REG[3])(fra.me.REG[3]);
     }
     label2: while(0);
     /* ./metamodel//partial_order.nit:263 */
     ATTR_partial_order___PartialOrderElement____linear_extension_cache(fra.me.REG[0]) = fra.me.REG[1];
   }
+  /* ./metamodel//partial_order.nit:265 */
   fra.me.REG[0] = ATTR_partial_order___PartialOrderElement____linear_extension_cache(fra.me.REG[0]);
   REGB0 = TAG_Bool(fra.me.REG[0]!=NIT_NULL);
-  /* ./metamodel//partial_order.nit:265 */
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Cast failed");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 265);
-    nit_exit(1);
+    nit_abort("Cast failed", NULL, LOCATE_partial_order, 265);
   }
   goto label3;
   label3: while(0);
@@ -1290,7 +1422,7 @@ val_t partial_order___PartialOrderElement___linear_extension(val_t p0){
   return fra.me.REG[0];
 }
 val_t partial_order___PartialOrderElement___reverse_linear_extension(val_t p0){
-  struct {struct stack_frame_t me; val_t MORE_REG[4];} fra;
+  struct {struct stack_frame_t me; val_t MORE_REG[5];} fra;
   val_t REGB0;
   val_t REGB1;
   val_t tmp;
@@ -1299,16 +1431,17 @@ val_t partial_order___PartialOrderElement___reverse_linear_extension(val_t p0){
   fra.me.line = 271;
   fra.me.meth = LOCATE_partial_order___PartialOrderElement___reverse_linear_extension;
   fra.me.has_broke = 0;
-  fra.me.REG_size = 5;
+  fra.me.REG_size = 6;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
   fra.me.REG[3] = NIT_NULL;
   fra.me.REG[4] = NIT_NULL;
+  fra.me.REG[5] = NIT_NULL;
   fra.me.REG[0] = p0;
+  /* ./metamodel//partial_order.nit:275 */
   fra.me.REG[1] = ATTR_partial_order___PartialOrderElement____reverse_linear_extension_cache(fra.me.REG[0]);
   REGB0 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
-  /* ./metamodel//partial_order.nit:275 */
   if (UNTAG_Bool(REGB0)) {
   } else {
     REGB1 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
@@ -1321,41 +1454,72 @@ val_t partial_order___PartialOrderElement___reverse_linear_extension(val_t p0){
     }
   }
   if (UNTAG_Bool(REGB0)) {
+    /* ./metamodel//partial_order.nit:276 */
     fra.me.REG[1] = NEW_HashSet_hash_collection___HashSet___init();
-    fra.me.REG[2] = CALL_partial_order___PartialOrderElement___direct_greaters(fra.me.REG[0])(fra.me.REG[0]);
-    fra.me.REG[2] = CALL_abstract_collection___Collection___iterator(fra.me.REG[2])(fra.me.REG[2]);
     /* ./metamodel//partial_order.nit:277 */
+    fra.me.REG[2] = CALL_partial_order___PartialOrderElement___direct_greaters(fra.me.REG[0])(fra.me.REG[0]);
+    /* ./../lib/standard//collection//array.nit:234 */
+    REGB0 = TAG_Int(0);
+    /* ./../lib/standard//collection//array.nit:235 */
+    REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[2])!=NIT_NULL);
+    if (UNTAG_Bool(REGB1)) {
+    } else {
+      nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 235);
+    }
+    REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[2]);
+    /* ./../lib/standard//collection//array.nit:236 */
+    fra.me.REG[3] = ATTR_array___Array____items(fra.me.REG[2]);
+    /* ./../lib/standard//collection//array.nit:237 */
     while(1) {
-      REGB0 = CALL_abstract_collection___Iterator___is_ok(fra.me.REG[2])(fra.me.REG[2]);
-      if (UNTAG_Bool(REGB0)) {
-        fra.me.REG[3] = CALL_abstract_collection___Iterator___item(fra.me.REG[2])(fra.me.REG[2]);
-        fra.me.REG[4] = CALL_partial_order___PartialOrderElement___order(fra.me.REG[0])(fra.me.REG[0]);
-        fra.me.REG[3] = CALL_partial_order___PartialOrder_____bra(fra.me.REG[4])(fra.me.REG[4], fra.me.REG[3]);
-        fra.me.REG[3] = CALL_partial_order___PartialOrderElement___linear_extension(fra.me.REG[3])(fra.me.REG[3]);
+      /* ./../lib/standard//collection//array.nit:23 */
+      REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[2])!=NIT_NULL);
+      if (UNTAG_Bool(REGB1)) {
+      } else {
+        nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+      }
+      REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[2]);
+      /* ./../lib/standard//kernel.nit:212 */
+      REGB1 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB1));
+      /* ./../lib/standard//collection//array.nit:237 */
+      if (UNTAG_Bool(REGB1)) {
+        /* ./../lib/standard//collection//array.nit:238 */
+        REGB1 = TAG_Bool(fra.me.REG[3]==NIT_NULL);
+        if (UNTAG_Bool(REGB1)) {
+          nit_abort("Reciever is null", NULL, LOCATE_array, 238);
+        }
+        /* ./../lib/standard//collection//array.nit:654 */
+        fra.me.REG[4] = ((Nit_NativeArray)fra.me.REG[3])->val[UNTAG_Int(REGB0)];
+        /* ./metamodel//partial_order.nit:278 */
+        fra.me.REG[5] = CALL_partial_order___PartialOrderElement___order(fra.me.REG[0])(fra.me.REG[0]);
+        fra.me.REG[4] = CALL_partial_order___PartialOrder_____bra(fra.me.REG[5])(fra.me.REG[5], fra.me.REG[4]);
+        fra.me.REG[4] = CALL_partial_order___PartialOrderElement___linear_extension(fra.me.REG[4])(fra.me.REG[4]);
         /* ./metamodel//partial_order.nit:279 */
-        CALL_abstract_collection___SimpleCollection___add_all(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
+        CALL_abstract_collection___SimpleCollection___add_all(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4]);
+        /* ./../lib/standard//collection//array.nit:239 */
+        REGB1 = TAG_Int(1);
+        /* ./../lib/standard//kernel.nit:215 */
+        REGB1 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB1));
+        /* ./../lib/standard//collection//array.nit:239 */
+        REGB0 = REGB1;
       } else {
-        /* ./metamodel//partial_order.nit:277 */
+        /* ./../lib/standard//collection//array.nit:237 */
         goto label1;
       }
-      CALL_abstract_collection___Iterator___next(fra.me.REG[2])(fra.me.REG[2]);
     }
     label1: while(0);
-    fra.me.REG[2] = CALL_partial_order___PartialOrderElement___value(fra.me.REG[0])(fra.me.REG[0]);
     /* ./metamodel//partial_order.nit:281 */
-    CALL_abstract_collection___SimpleCollection___add(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-    fra.me.REG[1] = CALL_array___Collection___to_a(fra.me.REG[1])(fra.me.REG[1]);
+    fra.me.REG[3] = CALL_partial_order___PartialOrderElement___value(fra.me.REG[0])(fra.me.REG[0]);
+    CALL_abstract_collection___SimpleCollection___add(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
     /* ./metamodel//partial_order.nit:282 */
+    fra.me.REG[1] = CALL_array___Collection___to_a(fra.me.REG[1])(fra.me.REG[1]);
     ATTR_partial_order___PartialOrderElement____linear_extension_cache(fra.me.REG[0]) = fra.me.REG[1];
   }
+  /* ./metamodel//partial_order.nit:284 */
   fra.me.REG[0] = ATTR_partial_order___PartialOrderElement____linear_extension_cache(fra.me.REG[0]);
   REGB0 = TAG_Bool(fra.me.REG[0]!=NIT_NULL);
-  /* ./metamodel//partial_order.nit:284 */
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Cast failed");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 284);
-    nit_exit(1);
+    nit_abort("Cast failed", NULL, LOCATE_partial_order, 284);
   }
   goto label2;
   label2: while(0);
@@ -1376,13 +1540,11 @@ val_t partial_order___PartialOrderElement_____l(val_t p0, val_t p1){
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____greaters(fra.me.REG[0])!=NIT_NULL);
   /* ./metamodel//partial_order.nit:290 */
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____greaters(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Uninitialized attribute %s", "_greaters");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 290);
-    nit_exit(1);
+    nit_abort("Uninitialized attribute %s", "_greaters", LOCATE_partial_order, 290);
   }
   fra.me.REG[0] = ATTR_partial_order___PartialOrderElement____greaters(fra.me.REG[0]);
   REGB0 = CALL_abstract_collection___Collection___has(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
@@ -1407,19 +1569,18 @@ val_t partial_order___PartialOrderElement_____leq(val_t p0, val_t p1){
   fra.me.REG[2] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  fra.me.REG[2] = ATTR_partial_order___PartialOrderElement____value(fra.me.REG[0]);
-  REGB0 = TAG_Bool(IS_EQUAL_NN(fra.me.REG[2],fra.me.REG[1]));
   /* ./metamodel//partial_order.nit:296 */
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____value(fra.me.REG[0])!=NIT_NULL);
   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;
-    }
+    nit_abort("Uninitialized attribute %s", "_value", LOCATE_partial_order, 296);
+  }
+  fra.me.REG[2] = ATTR_partial_order___PartialOrderElement____value(fra.me.REG[0]);
+  REGB0 = TAG_Bool(IS_EQUAL_OO(fra.me.REG[2],fra.me.REG[1]));
+  if (UNTAG_Bool(REGB0)) {
+  } 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 = TAG_Bool(true);
@@ -1427,9 +1588,7 @@ val_t partial_order___PartialOrderElement_____leq(val_t p0, val_t p1){
     REGB1 = TAG_Bool(ATTR_partial_order___PartialOrderElement____greaters(fra.me.REG[0])!=NIT_NULL);
     if (UNTAG_Bool(REGB1)) {
     } else {
-      fprintf(stderr, "Uninitialized attribute %s", "_greaters");
-      fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 296);
-      nit_exit(1);
+      nit_abort("Uninitialized attribute %s", "_greaters", LOCATE_partial_order, 296);
     }
     fra.me.REG[0] = ATTR_partial_order___PartialOrderElement____greaters(fra.me.REG[0]);
     REGB1 = CALL_abstract_collection___Collection___has(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
@@ -1455,16 +1614,19 @@ val_t partial_order___PartialOrderElement_____g(val_t p0, val_t p1){
   fra.me.REG[2] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____order(fra.me.REG[0])!=NIT_NULL);
   /* ./metamodel//partial_order.nit:302 */
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____order(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Uninitialized attribute %s", "_order");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 302);
-    nit_exit(1);
+    nit_abort("Uninitialized attribute %s", "_order", LOCATE_partial_order, 302);
   }
   fra.me.REG[2] = ATTR_partial_order___PartialOrderElement____order(fra.me.REG[0]);
   fra.me.REG[1] = CALL_partial_order___PartialOrder_____bra(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[1]);
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____value(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_value", LOCATE_partial_order, 302);
+  }
   fra.me.REG[0] = ATTR_partial_order___PartialOrderElement____value(fra.me.REG[0]);
   REGB0 = CALL_partial_order___PartialOrderElement_____l(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
   goto label1;
@@ -1488,19 +1650,18 @@ val_t partial_order___PartialOrderElement_____geq(val_t p0, val_t p1){
   fra.me.REG[2] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  fra.me.REG[2] = ATTR_partial_order___PartialOrderElement____value(fra.me.REG[0]);
-  REGB0 = TAG_Bool(IS_EQUAL_NN(fra.me.REG[2],fra.me.REG[1]));
   /* ./metamodel//partial_order.nit:308 */
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____value(fra.me.REG[0])!=NIT_NULL);
   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;
-    }
+    nit_abort("Uninitialized attribute %s", "_value", LOCATE_partial_order, 308);
+  }
+  fra.me.REG[2] = ATTR_partial_order___PartialOrderElement____value(fra.me.REG[0]);
+  REGB0 = TAG_Bool(IS_EQUAL_OO(fra.me.REG[2],fra.me.REG[1]));
+  if (UNTAG_Bool(REGB0)) {
+  } 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 = TAG_Bool(true);
@@ -1508,12 +1669,15 @@ val_t partial_order___PartialOrderElement_____geq(val_t p0, val_t p1){
     REGB1 = TAG_Bool(ATTR_partial_order___PartialOrderElement____order(fra.me.REG[0])!=NIT_NULL);
     if (UNTAG_Bool(REGB1)) {
     } else {
-      fprintf(stderr, "Uninitialized attribute %s", "_order");
-      fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 308);
-      nit_exit(1);
+      nit_abort("Uninitialized attribute %s", "_order", LOCATE_partial_order, 308);
     }
     fra.me.REG[2] = ATTR_partial_order___PartialOrderElement____order(fra.me.REG[0]);
     fra.me.REG[1] = CALL_partial_order___PartialOrder_____bra(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[1]);
+    REGB1 = TAG_Bool(ATTR_partial_order___PartialOrderElement____value(fra.me.REG[0])!=NIT_NULL);
+    if (UNTAG_Bool(REGB1)) {
+    } else {
+      nit_abort("Uninitialized attribute %s", "_value", LOCATE_partial_order, 308);
+    }
     fra.me.REG[0] = ATTR_partial_order___PartialOrderElement____value(fra.me.REG[0]);
     REGB1 = CALL_partial_order___PartialOrderElement_____l(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
     REGB0 = REGB1;
@@ -1537,25 +1701,24 @@ void partial_order___PartialOrderElement___register_direct_smallers(val_t p0, va
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____direct_smallers(fra.me.REG[0])!=NIT_NULL);
   /* ./metamodel//partial_order.nit:313 */
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____direct_smallers(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Uninitialized attribute %s", "_direct_smallers");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 313);
-    nit_exit(1);
+    nit_abort("Uninitialized attribute %s", "_direct_smallers", LOCATE_partial_order, 313);
   }
   fra.me.REG[0] = ATTR_partial_order___PartialOrderElement____direct_smallers(fra.me.REG[0]);
-  array___Array___add(fra.me.REG[0], fra.me.REG[1]);
+  CALL_abstract_collection___SimpleCollection___add(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
   stack_frame_head = fra.me.prev;
   return;
 }
 void partial_order___PartialOrderElement___init(val_t p0, val_t p1, val_t p2, val_t p3, int* init_table){
   int itpos1 = VAL2OBJ(p0)->vft[INIT_TABLE_POS_PartialOrderElement].i;
-  struct {struct stack_frame_t me; val_t MORE_REG[5];} fra;
+  struct {struct stack_frame_t me; val_t MORE_REG[6];} fra;
   val_t REGB0;
   val_t REGB1;
   val_t REGB2;
+  val_t REGB3;
   val_t tmp;
   if (init_table[itpos1]) return;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
@@ -1563,13 +1726,14 @@ void partial_order___PartialOrderElement___init(val_t p0, val_t p1, val_t p2, va
   fra.me.line = 316;
   fra.me.meth = LOCATE_partial_order___PartialOrderElement___init;
   fra.me.has_broke = 0;
-  fra.me.REG_size = 6;
+  fra.me.REG_size = 7;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
   fra.me.REG[3] = NIT_NULL;
   fra.me.REG[4] = NIT_NULL;
   fra.me.REG[5] = NIT_NULL;
+  fra.me.REG[6] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
   fra.me.REG[2] = p2;
@@ -1580,76 +1744,94 @@ void partial_order___PartialOrderElement___init(val_t p0, val_t p1, val_t p2, va
   ATTR_partial_order___PartialOrderElement____value(fra.me.REG[0]) = fra.me.REG[2];
   /* ./metamodel//partial_order.nit:320 */
   ATTR_partial_order___PartialOrderElement____direct_greaters(fra.me.REG[0]) = fra.me.REG[3];
-  fra.me.REG[1] = NEW_Array_array___Array___init();
   /* ./metamodel//partial_order.nit:321 */
+  fra.me.REG[1] = NEW_Array_array___Array___init();
   ATTR_partial_order___PartialOrderElement____direct_smallers(fra.me.REG[0]) = fra.me.REG[1];
-  fra.me.REG[1] = NEW_HashSet_hash_collection___HashSet___init();
   /* ./metamodel//partial_order.nit:323 */
-  ATTR_partial_order___PartialOrderElement____greaters(fra.me.REG[0]) = fra.me.REG[1];
   fra.me.REG[1] = NEW_HashSet_hash_collection___HashSet___init();
+  ATTR_partial_order___PartialOrderElement____greaters(fra.me.REG[0]) = fra.me.REG[1];
   /* ./metamodel//partial_order.nit:324 */
+  fra.me.REG[1] = NEW_HashSet_hash_collection___HashSet___init();
   ATTR_partial_order___PartialOrderElement____smallers_cache(fra.me.REG[0]) = fra.me.REG[1];
-  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____greaters(fra.me.REG[0])!=NIT_NULL);
   /* ./metamodel//partial_order.nit:326 */
+  REGB0 = TAG_Bool(ATTR_partial_order___PartialOrderElement____greaters(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    fprintf(stderr, "Uninitialized attribute %s", "_greaters");
-    fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 326);
-    nit_exit(1);
+    nit_abort("Uninitialized attribute %s", "_greaters", LOCATE_partial_order, 326);
   }
   fra.me.REG[1] = ATTR_partial_order___PartialOrderElement____greaters(fra.me.REG[0]);
+  /* ./metamodel//partial_order.nit:327 */
   REGB0 = TAG_Int(0);
-  fra.me.REG[3] = CALL_abstract_collection___Collection___iterator(fra.me.REG[3])(fra.me.REG[3]);
-  /* ./metamodel//partial_order.nit:328 */
+  /* ./../lib/standard//collection//array.nit:234 */
+  REGB1 = TAG_Int(0);
+  /* ./../lib/standard//collection//array.nit:235 */
+  REGB2 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[3])!=NIT_NULL);
+  if (UNTAG_Bool(REGB2)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 235);
+  }
+  REGB2 = ATTR_array___AbstractArrayRead____length(fra.me.REG[3]);
+  /* ./../lib/standard//collection//array.nit:236 */
+  fra.me.REG[4] = ATTR_array___Array____items(fra.me.REG[3]);
+  /* ./../lib/standard//collection//array.nit:237 */
   while(1) {
-    REGB1 = CALL_abstract_collection___Iterator___is_ok(fra.me.REG[3])(fra.me.REG[3]);
-    if (UNTAG_Bool(REGB1)) {
-      fra.me.REG[4] = CALL_abstract_collection___Iterator___item(fra.me.REG[3])(fra.me.REG[3]);
+    /* ./../lib/standard//collection//array.nit:23 */
+    REGB2 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[3])!=NIT_NULL);
+    if (UNTAG_Bool(REGB2)) {
+    } else {
+      nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+    }
+    REGB2 = ATTR_array___AbstractArrayRead____length(fra.me.REG[3]);
+    /* ./../lib/standard//kernel.nit:212 */
+    REGB2 = TAG_Bool(UNTAG_Int(REGB1)<UNTAG_Int(REGB2));
+    /* ./../lib/standard//collection//array.nit:237 */
+    if (UNTAG_Bool(REGB2)) {
+      /* ./../lib/standard//collection//array.nit:238 */
+      REGB2 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
+      if (UNTAG_Bool(REGB2)) {
+        nit_abort("Reciever is null", NULL, LOCATE_array, 238);
+      }
+      /* ./../lib/standard//collection//array.nit:654 */
+      fra.me.REG[5] = ((Nit_NativeArray)fra.me.REG[4])->val[UNTAG_Int(REGB1)];
       /* ./metamodel//partial_order.nit:329 */
-      CALL_abstract_collection___SimpleCollection___add(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4]);
-      REGB1 = TAG_Bool(ATTR_partial_order___PartialOrderElement____order(fra.me.REG[0])!=NIT_NULL);
+      CALL_abstract_collection___SimpleCollection___add(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[5]);
       /* ./metamodel//partial_order.nit:330 */
-      if (UNTAG_Bool(REGB1)) {
+      REGB2 = TAG_Bool(ATTR_partial_order___PartialOrderElement____order(fra.me.REG[0])!=NIT_NULL);
+      if (UNTAG_Bool(REGB2)) {
       } else {
-        fprintf(stderr, "Uninitialized attribute %s", "_order");
-        fprintf(stderr, " (%s:%d)\n", LOCATE_partial_order, 330);
-        nit_exit(1);
+        nit_abort("Uninitialized attribute %s", "_order", LOCATE_partial_order, 330);
       }
-      fra.me.REG[5] = ATTR_partial_order___PartialOrderElement____order(fra.me.REG[0]);
-      fra.me.REG[4] = CALL_partial_order___PartialOrder_____bra(fra.me.REG[5])(fra.me.REG[5], fra.me.REG[4]);
-      REGB1 = CALL_partial_order___PartialOrderElement___rank(fra.me.REG[4])(fra.me.REG[4]);
-      REGB1 = TAG_Bool(UNTAG_Int(REGB1)>=UNTAG_Int(REGB0));
+      fra.me.REG[6] = ATTR_partial_order___PartialOrderElement____order(fra.me.REG[0]);
+      fra.me.REG[5] = CALL_partial_order___PartialOrder_____bra(fra.me.REG[6])(fra.me.REG[6], fra.me.REG[5]);
       /* ./metamodel//partial_order.nit:331 */
-      if (UNTAG_Bool(REGB1)) {
-        REGB1 = CALL_partial_order___PartialOrderElement___rank(fra.me.REG[4])(fra.me.REG[4]);
-        REGB2 = TAG_Int(1);
-        REGB2 = TAG_Int(UNTAG_Int(REGB1)+UNTAG_Int(REGB2));
-        REGB0 = REGB2;
-      /* ./metamodel//partial_order.nit:332 */
+      REGB2 = CALL_partial_order___PartialOrderElement___rank(fra.me.REG[5])(fra.me.REG[5]);
+      /* ./../lib/standard//kernel.nit:213 */
+      REGB2 = TAG_Bool(UNTAG_Int(REGB2)>=UNTAG_Int(REGB0));
+      /* ./metamodel//partial_order.nit:331 */
+      if (UNTAG_Bool(REGB2)) {
+        /* ./metamodel//partial_order.nit:332 */
+        REGB2 = CALL_partial_order___PartialOrderElement___rank(fra.me.REG[5])(fra.me.REG[5]);
+        REGB3 = TAG_Int(1);
+        /* ./../lib/standard//kernel.nit:215 */
+        REGB3 = TAG_Int(UNTAG_Int(REGB2)+UNTAG_Int(REGB3));
+        /* ./metamodel//partial_order.nit:332 */
+        REGB0 = REGB3;
       }
       /* ./metamodel//partial_order.nit:334 */
-      CALL_partial_order___PartialOrderElement___register_direct_smallers(fra.me.REG[4])(fra.me.REG[4], fra.me.REG[2]);
-      fra.me.REG[4] = CALL_partial_order___PartialOrderElement___greaters(fra.me.REG[4])(fra.me.REG[4]);
-      fra.me.REG[4] = CALL_abstract_collection___Collection___iterator(fra.me.REG[4])(fra.me.REG[4]);
+      CALL_partial_order___PartialOrderElement___register_direct_smallers(fra.me.REG[5])(fra.me.REG[5], fra.me.REG[2]);
       /* ./metamodel//partial_order.nit:335 */
-      while(1) {
-        REGB2 = CALL_abstract_collection___Iterator___is_ok(fra.me.REG[4])(fra.me.REG[4]);
-        if (UNTAG_Bool(REGB2)) {
-          fra.me.REG[5] = CALL_abstract_collection___Iterator___item(fra.me.REG[4])(fra.me.REG[4]);
-          /* ./metamodel//partial_order.nit:336 */
-          CALL_abstract_collection___SimpleCollection___add(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[5]);
-        } else {
-          /* ./metamodel//partial_order.nit:335 */
-          goto label1;
-        }
-        CALL_abstract_collection___Iterator___next(fra.me.REG[4])(fra.me.REG[4]);
-      }
-      label1: while(0);
+      fra.me.REG[5] = CALL_partial_order___PartialOrderElement___greaters(fra.me.REG[5])(fra.me.REG[5]);
+      CALL_abstract_collection___Collection___iterate(fra.me.REG[5])(fra.me.REG[5], (&(fra.me)), ((fun_t)OC_partial_order___PartialOrderElement___init_1));
+      /* ./../lib/standard//collection//array.nit:239 */
+      REGB3 = TAG_Int(1);
+      /* ./../lib/standard//kernel.nit:215 */
+      REGB3 = TAG_Int(UNTAG_Int(REGB1)+UNTAG_Int(REGB3));
+      /* ./../lib/standard//collection//array.nit:239 */
+      REGB1 = REGB3;
     } else {
-      /* ./metamodel//partial_order.nit:328 */
+      /* ./../lib/standard//collection//array.nit:237 */
       goto label2;
     }
-    CALL_abstract_collection___Iterator___next(fra.me.REG[3])(fra.me.REG[3]);
   }
   label2: while(0);
   /* ./metamodel//partial_order.nit:339 */
@@ -1658,3 +1840,19 @@ void partial_order___PartialOrderElement___init(val_t p0, val_t p1, val_t p2, va
   init_table[itpos1] = 1;
   return;
 }
+      void OC_partial_order___PartialOrderElement___init_1(struct stack_frame_t *closctx, 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_partial_order;
+        fra.me.line = 0;
+        fra.me.meth = LOCATE_partial_order___PartialOrderElement___init;
+        fra.me.has_broke = 0;
+        fra.me.REG_size = 1;
+        fra.me.REG[0] = NIT_NULL;
+        fra.me.REG[0] = p0;
+        /* ./metamodel//partial_order.nit:336 */
+        CALL_abstract_collection___SimpleCollection___add(closctx->REG[1])(closctx->REG[1], fra.me.REG[0]);
+        stack_frame_head = fra.me.prev;
+        return;
+      }