Merge remote branch 'alexis/wip'

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

diff --git a/c_src/syntax___icode_generation._sep.c b/c_src/syntax___icode_generation._sep.c
index babe6cd..c912d17 100644 (file)
--- a/c_src/syntax___icode_generation._sep.c
+++ b/c_src/syntax___icode_generation._sep.c
@@ -11,6 +11,7 @@ void syntax___icode_generation___A2IContext___stmt(val_t p0, val_t p1){
   fra.me.meth = LOCATE_syntax___icode_generation___A2IContext___stmt;
   fra.me.has_broke = 0;
   fra.me.REG_size = 4;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -90,6 +91,7 @@ val_t syntax___icode_generation___A2IContext___add_new_array(val_t p0, val_t p1,
   fra.me.meth = LOCATE_syntax___icode_generation___A2IContext___add_new_array;
   fra.me.has_broke = 0;
   fra.me.REG_size = 5;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -144,6 +146,7 @@ void syntax___icode_generation___A2IContext___add_call_array_add(val_t p0, val_t
   fra.me.meth = LOCATE_syntax___icode_generation___A2IContext___add_call_array_add;
   fra.me.has_broke = 0;
   fra.me.REG_size = 6;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -192,6 +195,7 @@ val_t syntax___icode_generation___A2IContext___variable(val_t p0, val_t p1){
   fra.me.meth = LOCATE_syntax___icode_generation___A2IContext___variable;
   fra.me.has_broke = 0;
   fra.me.REG_size = 5;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -254,6 +258,7 @@ val_t syntax___icode_generation___A2IContext___closurevariables(val_t p0){
   fra.me.meth = LOCATE_syntax___icode_generation___A2IContext___closurevariables;
   fra.me.has_broke = 0;
   fra.me.REG_size = 1;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[0] = p0;
   /* ./syntax//icode_generation.nit:70 */
@@ -276,6 +281,7 @@ val_t syntax___icode_generation___A2IContext___visitor(val_t p0){
   fra.me.meth = LOCATE_syntax___icode_generation___A2IContext___visitor;
   fra.me.has_broke = 0;
   fra.me.REG_size = 1;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[0] = p0;
   /* ./syntax//icode_generation.nit:73 */
@@ -297,6 +303,7 @@ val_t syntax___icode_generation___A2IContext___return_seq(val_t p0){
   fra.me.meth = LOCATE_syntax___icode_generation___A2IContext___return_seq;
   fra.me.has_broke = 0;
   fra.me.REG_size = 1;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[0] = p0;
   /* ./syntax//icode_generation.nit:76 */
@@ -313,6 +320,7 @@ void syntax___icode_generation___A2IContext___return_seq__eq(val_t p0, val_t p1)
   fra.me.meth = LOCATE_syntax___icode_generation___A2IContext___return_seq__eq;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
@@ -331,6 +339,7 @@ val_t syntax___icode_generation___A2IContext___return_value(val_t p0){
   fra.me.meth = LOCATE_syntax___icode_generation___A2IContext___return_value;
   fra.me.has_broke = 0;
   fra.me.REG_size = 1;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[0] = p0;
   /* ./syntax//icode_generation.nit:79 */
@@ -347,6 +356,7 @@ void syntax___icode_generation___A2IContext___return_value__eq(val_t p0, val_t p
   fra.me.meth = LOCATE_syntax___icode_generation___A2IContext___return_value__eq;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
@@ -365,6 +375,7 @@ val_t syntax___icode_generation___A2IContext___method(val_t p0){
   fra.me.meth = LOCATE_syntax___icode_generation___A2IContext___method;
   fra.me.has_broke = 0;
   fra.me.REG_size = 1;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[0] = p0;
   /* ./syntax//icode_generation.nit:82 */
@@ -381,6 +392,7 @@ val_t syntax___icode_generation___A2IContext___selfreg(val_t p0){
   fra.me.meth = LOCATE_syntax___icode_generation___A2IContext___selfreg;
   fra.me.has_broke = 0;
   fra.me.REG_size = 1;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[0] = p0;
   /* ./syntax//icode_generation.nit:85 */
@@ -397,6 +409,7 @@ void syntax___icode_generation___A2IContext___selfreg__eq(val_t p0, val_t p1){
   fra.me.meth = LOCATE_syntax___icode_generation___A2IContext___selfreg__eq;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
@@ -417,6 +430,7 @@ void syntax___icode_generation___A2IContext___init(val_t p0, val_t p1, val_t p2,
   fra.me.meth = LOCATE_syntax___icode_generation___A2IContext___init;
   fra.me.has_broke = 0;
   fra.me.REG_size = 6;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -460,6 +474,7 @@ void syntax___icode_generation___A2IContext___invoke_super_init_calls_after(val_
   fra.me.meth = LOCATE_syntax___icode_generation___A2IContext___invoke_super_init_calls_after;
   fra.me.has_broke = 0;
   fra.me.REG_size = 6;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -524,23 +539,23 @@ void syntax___icode_generation___A2IContext___invoke_super_init_calls_after(val_
         nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 109);
       }
       fra.me.REG[3] = CALL_syntax___syntax_base___AConcreteInitPropdef___super_init_calls(fra.me.REG[2])(fra.me.REG[2]);
-      /* ./../lib/standard//collection//array.nit:241 */
+      /* ./../lib/standard//collection//array.nit:278 */
       REGB2 = REGB0;
-      /* ./../lib/standard//collection//array.nit:243 */
+      /* ./../lib/standard//collection//array.nit:280 */
       REGB3 = TAG_Int(0);
       REGB4 = TAG_Bool(VAL_ISA(REGB3, VTCOLOR_standard___kernel___Comparable___OTHER(REGB2), VTID_standard___kernel___Comparable___OTHER(REGB2))) /*cast OTHER*/;
       if (UNTAG_Bool(REGB4)) {
       } else {
         nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
       }
-      /* ./../lib/standard//kernel.nit:216 */
+      /* ./../lib/standard//kernel.nit:233 */
       REGB3 = TAG_Bool(UNTAG_Int(REGB2)>=UNTAG_Int(REGB3));
-      /* ./../lib/standard//collection//array.nit:243 */
+      /* ./../lib/standard//collection//array.nit:280 */
       if (UNTAG_Bool(REGB3)) {
         REGB3 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[3])!=NIT_NULL);
         if (UNTAG_Bool(REGB3)) {
         } else {
-          nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 243);
+          nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 280);
         }
         REGB3 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[3]);
         REGB4 = TAG_Bool(VAL_ISA(REGB3, VTCOLOR_standard___kernel___Comparable___OTHER(REGB2), VTID_standard___kernel___Comparable___OTHER(REGB2))) /*cast OTHER*/;
@@ -548,26 +563,26 @@ void syntax___icode_generation___A2IContext___invoke_super_init_calls_after(val_
         } else {
           nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
         }
-        /* ./../lib/standard//kernel.nit:215 */
+        /* ./../lib/standard//kernel.nit:232 */
         REGB3 = TAG_Bool(UNTAG_Int(REGB2)<UNTAG_Int(REGB3));
       } else {
-        /* ./../lib/standard//collection//array.nit:243 */
+        /* ./../lib/standard//collection//array.nit:280 */
         REGB4 = TAG_Bool(false);
         REGB3 = REGB4;
       }
       if (UNTAG_Bool(REGB3)) {
       } else {
-        nit_abort("Assert %s  failed", "'index'", LOCATE_standard___collection___array, 243);
+        nit_abort("Assert %s  failed", "'index'", LOCATE_standard___collection___array, 280);
       }
-      /* ./../lib/standard//collection//array.nit:244 */
+      /* ./../lib/standard//collection//array.nit:281 */
       fra.me.REG[3] = ATTR_standard___collection___array___Array____items(fra.me.REG[3]);
       REGB3 = TAG_Bool(fra.me.REG[3]==NIT_NULL);
       if (UNTAG_Bool(REGB3)) {
-        nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 244);
+        nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 281);
       }
-      /* ./../lib/standard//collection//array.nit:652 */
+      /* ./../lib/standard//collection//array.nit:718 */
       fra.me.REG[3] = ((Nit_NativeArray)fra.me.REG[3])->val[UNTAG_Int(REGB2)];
-      /* ./../lib/standard//collection//array.nit:244 */
+      /* ./../lib/standard//collection//array.nit:281 */
       goto label2;
       label2: while(0);
       /* ./syntax//icode_generation.nit:109 */
@@ -587,7 +602,7 @@ void syntax___icode_generation___A2IContext___invoke_super_init_calls_after(val_
       if (UNTAG_Bool(REGB2)) {
         /* ./syntax//icode_generation.nit:110 */
         REGB2 = TAG_Int(1);
-        /* ./../lib/standard//kernel.nit:218 */
+        /* ./../lib/standard//kernel.nit:235 */
         REGB2 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB2));
         /* ./syntax//icode_generation.nit:110 */
         REGB0 = REGB2;
@@ -599,7 +614,7 @@ void syntax___icode_generation___A2IContext___invoke_super_init_calls_after(val_
     label3: while(0);
     /* ./syntax//icode_generation.nit:112 */
     REGB2 = TAG_Int(1);
-    /* ./../lib/standard//kernel.nit:218 */
+    /* ./../lib/standard//kernel.nit:235 */
     REGB2 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB2));
     /* ./syntax//icode_generation.nit:112 */
     REGB0 = REGB2;
@@ -610,23 +625,23 @@ void syntax___icode_generation___A2IContext___invoke_super_init_calls_after(val_
         nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 114);
       }
       fra.me.REG[3] = CALL_syntax___syntax_base___AConcreteInitPropdef___explicit_super_init_calls(fra.me.REG[2])(fra.me.REG[2]);
-      /* ./../lib/standard//collection//array.nit:241 */
+      /* ./../lib/standard//collection//array.nit:278 */
       REGB2 = REGB1;
-      /* ./../lib/standard//collection//array.nit:243 */
+      /* ./../lib/standard//collection//array.nit:280 */
       REGB3 = TAG_Int(0);
       REGB4 = TAG_Bool(VAL_ISA(REGB3, VTCOLOR_standard___kernel___Comparable___OTHER(REGB2), VTID_standard___kernel___Comparable___OTHER(REGB2))) /*cast OTHER*/;
       if (UNTAG_Bool(REGB4)) {
       } else {
         nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
       }
-      /* ./../lib/standard//kernel.nit:216 */
+      /* ./../lib/standard//kernel.nit:233 */
       REGB3 = TAG_Bool(UNTAG_Int(REGB2)>=UNTAG_Int(REGB3));
-      /* ./../lib/standard//collection//array.nit:243 */
+      /* ./../lib/standard//collection//array.nit:280 */
       if (UNTAG_Bool(REGB3)) {
         REGB3 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[3])!=NIT_NULL);
         if (UNTAG_Bool(REGB3)) {
         } else {
-          nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 243);
+          nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 280);
         }
         REGB3 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[3]);
         REGB4 = TAG_Bool(VAL_ISA(REGB3, VTCOLOR_standard___kernel___Comparable___OTHER(REGB2), VTID_standard___kernel___Comparable___OTHER(REGB2))) /*cast OTHER*/;
@@ -634,26 +649,26 @@ void syntax___icode_generation___A2IContext___invoke_super_init_calls_after(val_
         } else {
           nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
         }
-        /* ./../lib/standard//kernel.nit:215 */
+        /* ./../lib/standard//kernel.nit:232 */
         REGB3 = TAG_Bool(UNTAG_Int(REGB2)<UNTAG_Int(REGB3));
       } else {
-        /* ./../lib/standard//collection//array.nit:243 */
+        /* ./../lib/standard//collection//array.nit:280 */
         REGB4 = TAG_Bool(false);
         REGB3 = REGB4;
       }
       if (UNTAG_Bool(REGB3)) {
       } else {
-        nit_abort("Assert %s  failed", "'index'", LOCATE_standard___collection___array, 243);
+        nit_abort("Assert %s  failed", "'index'", LOCATE_standard___collection___array, 280);
       }
-      /* ./../lib/standard//collection//array.nit:244 */
+      /* ./../lib/standard//collection//array.nit:281 */
       fra.me.REG[3] = ATTR_standard___collection___array___Array____items(fra.me.REG[3]);
       REGB3 = TAG_Bool(fra.me.REG[3]==NIT_NULL);
       if (UNTAG_Bool(REGB3)) {
-        nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 244);
+        nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 281);
       }
-      /* ./../lib/standard//collection//array.nit:652 */
+      /* ./../lib/standard//collection//array.nit:718 */
       fra.me.REG[3] = ((Nit_NativeArray)fra.me.REG[3])->val[UNTAG_Int(REGB2)];
-      /* ./../lib/standard//collection//array.nit:244 */
+      /* ./../lib/standard//collection//array.nit:281 */
       goto label4;
       label4: while(0);
       /* ./syntax//icode_generation.nit:114 */
@@ -673,7 +688,7 @@ void syntax___icode_generation___A2IContext___invoke_super_init_calls_after(val_
       if (UNTAG_Bool(REGB2)) {
         /* ./syntax//icode_generation.nit:115 */
         REGB2 = TAG_Int(1);
-        /* ./../lib/standard//kernel.nit:218 */
+        /* ./../lib/standard//kernel.nit:235 */
         REGB2 = TAG_Int(UNTAG_Int(REGB1)+UNTAG_Int(REGB2));
         /* ./syntax//icode_generation.nit:115 */
         REGB1 = REGB2;
@@ -685,7 +700,7 @@ void syntax___icode_generation___A2IContext___invoke_super_init_calls_after(val_
     label5: while(0);
     /* ./syntax//icode_generation.nit:117 */
     REGB2 = TAG_Int(1);
-    /* ./../lib/standard//kernel.nit:218 */
+    /* ./../lib/standard//kernel.nit:235 */
     REGB2 = TAG_Int(UNTAG_Int(REGB1)+UNTAG_Int(REGB2));
     /* ./syntax//icode_generation.nit:117 */
     REGB1 = REGB2;
@@ -698,11 +713,11 @@ void syntax___icode_generation___A2IContext___invoke_super_init_calls_after(val_
     nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 120);
   }
   fra.me.REG[3] = CALL_syntax___syntax_base___AConcreteInitPropdef___explicit_super_init_calls(fra.me.REG[2])(fra.me.REG[2]);
-  /* ./../lib/standard//collection//array.nit:23 */
+  /* ./../lib/standard//collection//array.nit:24 */
   REGB2 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[3])!=NIT_NULL);
   if (UNTAG_Bool(REGB2)) {
   } else {
-    nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 23);
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 24);
   }
   REGB2 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[3]);
   REGB3 = TAG_Bool(VAL_ISA(REGB2, VTCOLOR_standard___kernel___Comparable___OTHER(REGB1), VTID_standard___kernel___Comparable___OTHER(REGB1))) /*cast OTHER*/;
@@ -710,7 +725,7 @@ void syntax___icode_generation___A2IContext___invoke_super_init_calls_after(val_
   } else {
     nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
   }
-  /* ./../lib/standard//kernel.nit:215 */
+  /* ./../lib/standard//kernel.nit:232 */
   REGB2 = TAG_Bool(UNTAG_Int(REGB1)<UNTAG_Int(REGB2));
   /* ./syntax//icode_generation.nit:120 */
   if (UNTAG_Bool(REGB2)) {
@@ -720,21 +735,21 @@ void syntax___icode_generation___A2IContext___invoke_super_init_calls_after(val_
       nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 121);
     }
     fra.me.REG[3] = CALL_syntax___syntax_base___AConcreteInitPropdef___explicit_super_init_calls(fra.me.REG[2])(fra.me.REG[2]);
-    /* ./../lib/standard//collection//array.nit:243 */
+    /* ./../lib/standard//collection//array.nit:280 */
     REGB2 = TAG_Int(0);
     REGB3 = TAG_Bool(VAL_ISA(REGB2, VTCOLOR_standard___kernel___Comparable___OTHER(REGB1), VTID_standard___kernel___Comparable___OTHER(REGB1))) /*cast OTHER*/;
     if (UNTAG_Bool(REGB3)) {
     } else {
       nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
     }
-    /* ./../lib/standard//kernel.nit:216 */
+    /* ./../lib/standard//kernel.nit:233 */
     REGB2 = TAG_Bool(UNTAG_Int(REGB1)>=UNTAG_Int(REGB2));
-    /* ./../lib/standard//collection//array.nit:243 */
+    /* ./../lib/standard//collection//array.nit:280 */
     if (UNTAG_Bool(REGB2)) {
       REGB2 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[3])!=NIT_NULL);
       if (UNTAG_Bool(REGB2)) {
       } else {
-        nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 243);
+        nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 280);
       }
       REGB2 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[3]);
       REGB3 = TAG_Bool(VAL_ISA(REGB2, VTCOLOR_standard___kernel___Comparable___OTHER(REGB1), VTID_standard___kernel___Comparable___OTHER(REGB1))) /*cast OTHER*/;
@@ -742,26 +757,26 @@ void syntax___icode_generation___A2IContext___invoke_super_init_calls_after(val_
       } else {
         nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
       }
-      /* ./../lib/standard//kernel.nit:215 */
+      /* ./../lib/standard//kernel.nit:232 */
       REGB2 = TAG_Bool(UNTAG_Int(REGB1)<UNTAG_Int(REGB2));
     } else {
-      /* ./../lib/standard//collection//array.nit:243 */
+      /* ./../lib/standard//collection//array.nit:280 */
       REGB3 = TAG_Bool(false);
       REGB2 = REGB3;
     }
     if (UNTAG_Bool(REGB2)) {
     } else {
-      nit_abort("Assert %s  failed", "'index'", LOCATE_standard___collection___array, 243);
+      nit_abort("Assert %s  failed", "'index'", LOCATE_standard___collection___array, 280);
     }
-    /* ./../lib/standard//collection//array.nit:244 */
+    /* ./../lib/standard//collection//array.nit:281 */
     fra.me.REG[3] = ATTR_standard___collection___array___Array____items(fra.me.REG[3]);
     REGB2 = TAG_Bool(fra.me.REG[3]==NIT_NULL);
     if (UNTAG_Bool(REGB2)) {
-      nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 244);
+      nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 281);
     }
-    /* ./../lib/standard//collection//array.nit:652 */
+    /* ./../lib/standard//collection//array.nit:718 */
     fra.me.REG[3] = ((Nit_NativeArray)fra.me.REG[3])->val[UNTAG_Int(REGB1)];
-    /* ./../lib/standard//collection//array.nit:244 */
+    /* ./../lib/standard//collection//array.nit:281 */
     goto label6;
     label6: while(0);
     /* ./syntax//icode_generation.nit:121 */
@@ -773,11 +788,11 @@ void syntax___icode_generation___A2IContext___invoke_super_init_calls_after(val_
     nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 123);
   }
   fra.me.REG[3] = CALL_syntax___syntax_base___AConcreteInitPropdef___super_init_calls(fra.me.REG[2])(fra.me.REG[2]);
-  /* ./../lib/standard//collection//array.nit:23 */
+  /* ./../lib/standard//collection//array.nit:24 */
   REGB1 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[3])!=NIT_NULL);
   if (UNTAG_Bool(REGB1)) {
   } else {
-    nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 23);
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 24);
   }
   REGB1 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[3]);
   /* ./syntax//icode_generation.nit:124 */
@@ -787,7 +802,7 @@ void syntax___icode_generation___A2IContext___invoke_super_init_calls_after(val_
     } else {
       nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
     }
-    /* ./../lib/standard//kernel.nit:215 */
+    /* ./../lib/standard//kernel.nit:232 */
     REGB2 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB1));
     /* ./syntax//icode_generation.nit:124 */
     if (UNTAG_Bool(REGB2)) {
@@ -797,23 +812,23 @@ void syntax___icode_generation___A2IContext___invoke_super_init_calls_after(val_
         nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 125);
       }
       fra.me.REG[3] = CALL_syntax___syntax_base___AConcreteInitPropdef___super_init_calls(fra.me.REG[2])(fra.me.REG[2]);
-      /* ./../lib/standard//collection//array.nit:241 */
+      /* ./../lib/standard//collection//array.nit:278 */
       REGB2 = REGB0;
-      /* ./../lib/standard//collection//array.nit:243 */
+      /* ./../lib/standard//collection//array.nit:280 */
       REGB3 = TAG_Int(0);
       REGB4 = TAG_Bool(VAL_ISA(REGB3, VTCOLOR_standard___kernel___Comparable___OTHER(REGB2), VTID_standard___kernel___Comparable___OTHER(REGB2))) /*cast OTHER*/;
       if (UNTAG_Bool(REGB4)) {
       } else {
         nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
       }
-      /* ./../lib/standard//kernel.nit:216 */
+      /* ./../lib/standard//kernel.nit:233 */
       REGB3 = TAG_Bool(UNTAG_Int(REGB2)>=UNTAG_Int(REGB3));
-      /* ./../lib/standard//collection//array.nit:243 */
+      /* ./../lib/standard//collection//array.nit:280 */
       if (UNTAG_Bool(REGB3)) {
         REGB3 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[3])!=NIT_NULL);
         if (UNTAG_Bool(REGB3)) {
         } else {
-          nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 243);
+          nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 280);
         }
         REGB3 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[3]);
         REGB4 = TAG_Bool(VAL_ISA(REGB3, VTCOLOR_standard___kernel___Comparable___OTHER(REGB2), VTID_standard___kernel___Comparable___OTHER(REGB2))) /*cast OTHER*/;
@@ -821,26 +836,26 @@ void syntax___icode_generation___A2IContext___invoke_super_init_calls_after(val_
         } else {
           nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
         }
-        /* ./../lib/standard//kernel.nit:215 */
+        /* ./../lib/standard//kernel.nit:232 */
         REGB3 = TAG_Bool(UNTAG_Int(REGB2)<UNTAG_Int(REGB3));
       } else {
-        /* ./../lib/standard//collection//array.nit:243 */
+        /* ./../lib/standard//collection//array.nit:280 */
         REGB4 = TAG_Bool(false);
         REGB3 = REGB4;
       }
       if (UNTAG_Bool(REGB3)) {
       } else {
-        nit_abort("Assert %s  failed", "'index'", LOCATE_standard___collection___array, 243);
+        nit_abort("Assert %s  failed", "'index'", LOCATE_standard___collection___array, 280);
       }
-      /* ./../lib/standard//collection//array.nit:244 */
+      /* ./../lib/standard//collection//array.nit:281 */
       fra.me.REG[3] = ATTR_standard___collection___array___Array____items(fra.me.REG[3]);
       REGB3 = TAG_Bool(fra.me.REG[3]==NIT_NULL);
       if (UNTAG_Bool(REGB3)) {
-        nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 244);
+        nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 281);
       }
-      /* ./../lib/standard//collection//array.nit:652 */
+      /* ./../lib/standard//collection//array.nit:718 */
       fra.me.REG[3] = ((Nit_NativeArray)fra.me.REG[3])->val[UNTAG_Int(REGB2)];
-      /* ./../lib/standard//collection//array.nit:244 */
+      /* ./../lib/standard//collection//array.nit:281 */
       goto label7;
       label7: while(0);
       /* ./syntax//icode_generation.nit:126 */
@@ -866,7 +881,7 @@ void syntax___icode_generation___A2IContext___invoke_super_init_calls_after(val_
       REGB4 = TAG_Bool(IS_EQUAL_OO(REGB2,REGB3));
       if (UNTAG_Bool(REGB4)) {
       } else {
-        /* ./../lib/standard//kernel.nit:210 */
+        /* ./../lib/standard//kernel.nit:227 */
         REGB3 = TAG_Bool((REGB2)==(REGB3));
         /* ./syntax//icode_generation.nit:128 */
         REGB4 = REGB3;
@@ -888,7 +903,7 @@ void syntax___icode_generation___A2IContext___invoke_super_init_calls_after(val_
       CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[4]);
       /* ./syntax//icode_generation.nit:136 */
       REGB4 = TAG_Int(1);
-      /* ./../lib/standard//kernel.nit:218 */
+      /* ./../lib/standard//kernel.nit:235 */
       REGB4 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB4));
       /* ./syntax//icode_generation.nit:136 */
       REGB0 = REGB4;
@@ -912,6 +927,7 @@ void syntax___icode_generation___A2IContext___invoke_super_init_calls_after(val_
           fra.me.meth = LOCATE_syntax___icode_generation___A2IContext___invoke_super_init_calls_after;
           fra.me.has_broke = 0;
           fra.me.REG_size = 1;
+          fra.me.nitni_local_ref_head = NULL;
           fra.me.REG[0] = NIT_NULL;
           fra.me.closure_ctx = closctx_param;
           fra.me.closure_funs = CREG;
@@ -933,6 +949,7 @@ void syntax___icode_generation___A2IContext___generate_stmt(val_t p0, val_t p1){
   fra.me.meth = LOCATE_syntax___icode_generation___A2IContext___generate_stmt;
   fra.me.has_broke = 0;
   fra.me.REG_size = 3;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -980,6 +997,7 @@ val_t syntax___icode_generation___A2IContext___generate_expr(val_t p0, val_t p1)
   fra.me.meth = LOCATE_syntax___icode_generation___A2IContext___generate_expr;
   fra.me.has_broke = 0;
   fra.me.REG_size = 4;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -1016,6 +1034,7 @@ val_t syntax___icode_generation___EscapableBlock___break_seq(val_t p0){
   fra.me.meth = LOCATE_syntax___icode_generation___EscapableBlock___break_seq;
   fra.me.has_broke = 0;
   fra.me.REG_size = 1;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[0] = p0;
   /* ./syntax//icode_generation.nit:165 */
@@ -1032,6 +1051,7 @@ void syntax___icode_generation___EscapableBlock___break_seq__eq(val_t p0, val_t
   fra.me.meth = LOCATE_syntax___icode_generation___EscapableBlock___break_seq__eq;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
@@ -1050,6 +1070,7 @@ val_t syntax___icode_generation___EscapableBlock___continue_seq(val_t p0){
   fra.me.meth = LOCATE_syntax___icode_generation___EscapableBlock___continue_seq;
   fra.me.has_broke = 0;
   fra.me.REG_size = 1;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[0] = p0;
   /* ./syntax//icode_generation.nit:168 */
@@ -1066,6 +1087,7 @@ void syntax___icode_generation___EscapableBlock___continue_seq__eq(val_t p0, val
   fra.me.meth = LOCATE_syntax___icode_generation___EscapableBlock___continue_seq__eq;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
@@ -1084,6 +1106,7 @@ val_t syntax___icode_generation___EscapableBlock___break_value(val_t p0){
   fra.me.meth = LOCATE_syntax___icode_generation___EscapableBlock___break_value;
   fra.me.has_broke = 0;
   fra.me.REG_size = 1;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[0] = p0;
   /* ./syntax//icode_generation.nit:171 */
@@ -1100,6 +1123,7 @@ void syntax___icode_generation___EscapableBlock___break_value__eq(val_t p0, val_
   fra.me.meth = LOCATE_syntax___icode_generation___EscapableBlock___break_value__eq;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
@@ -1118,6 +1142,7 @@ val_t syntax___icode_generation___EscapableBlock___continue_value(val_t p0){
   fra.me.meth = LOCATE_syntax___icode_generation___EscapableBlock___continue_value;
   fra.me.has_broke = 0;
   fra.me.REG_size = 1;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[0] = p0;
   /* ./syntax//icode_generation.nit:174 */
@@ -1134,6 +1159,7 @@ void syntax___icode_generation___EscapableBlock___continue_value__eq(val_t p0, v
   fra.me.meth = LOCATE_syntax___icode_generation___EscapableBlock___continue_value__eq;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
@@ -1152,6 +1178,7 @@ void syntax___icode_generation___MMSrcModule___generate_icode(val_t p0, val_t p1
   fra.me.meth = LOCATE_syntax___icode_generation___MMSrcModule___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 3;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -1161,6 +1188,7 @@ void syntax___icode_generation___MMSrcModule___generate_icode(val_t p0, val_t p1
   fra.me.REG[1] = NEW_A2IVisitor_syntax___icode_generation___A2IVisitor___init(fra.me.REG[1], fra.me.REG[0]);
   /* ./syntax//icode_generation.nit:183 */
   fra.me.REG[2] = CALL_syntax___syntax_base___MMSrcModule___src_local_classes(fra.me.REG[0])(fra.me.REG[0]);
+  fra.me.REG[2] = CALL_standard___collection___abstract_collection___MapRead___values(fra.me.REG[2])(fra.me.REG[2]);
   CALL_standard___collection___abstract_collection___Collection___iterate(fra.me.REG[2])(fra.me.REG[2], (&(fra.me)), ((fun_t)OC_syntax___icode_generation___MMSrcModule___generate_icode_1));
   stack_frame_head = fra.me.prev;
   return;
@@ -1175,6 +1203,7 @@ void syntax___icode_generation___MMSrcModule___generate_icode(val_t p0, val_t p1
     fra.me.meth = LOCATE_syntax___icode_generation___MMSrcModule___generate_icode;
     fra.me.has_broke = 0;
     fra.me.REG_size = 1;
+    fra.me.nitni_local_ref_head = NULL;
     fra.me.REG[0] = NIT_NULL;
     fra.me.closure_ctx = closctx_param;
     fra.me.closure_funs = CREG;
@@ -1182,6 +1211,7 @@ void syntax___icode_generation___MMSrcModule___generate_icode(val_t p0, val_t p1
     CREG[0] = clos_fun0;
     /* ./syntax//icode_generation.nit:184 */
     fra.me.REG[0] = CALL_syntax___syntax_base___MMSrcLocalClass___src_local_properties(fra.me.REG[0])(fra.me.REG[0]);
+    fra.me.REG[0] = CALL_standard___collection___abstract_collection___MapRead___values(fra.me.REG[0])(fra.me.REG[0]);
     CALL_standard___collection___abstract_collection___Collection___iterate(fra.me.REG[0])(fra.me.REG[0], closctx, ((fun_t)OC_syntax___icode_generation___MMSrcModule___generate_icode_2));
     stack_frame_head = fra.me.prev;
     return;
@@ -1197,6 +1227,7 @@ void syntax___icode_generation___MMSrcModule___generate_icode(val_t p0, val_t p1
       fra.me.meth = LOCATE_syntax___icode_generation___MMSrcModule___generate_icode;
       fra.me.has_broke = 0;
       fra.me.REG_size = 1;
+      fra.me.nitni_local_ref_head = NULL;
       fra.me.REG[0] = NIT_NULL;
       fra.me.closure_ctx = closctx_param;
       fra.me.closure_funs = CREG;
@@ -1227,6 +1258,7 @@ val_t syntax___icode_generation___MMSrcAttribute___iroutine(val_t p0){
   fra.me.meth = LOCATE_syntax___icode_generation___MMSrcAttribute___iroutine;
   fra.me.has_broke = 0;
   fra.me.REG_size = 1;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[0] = p0;
   /* ./syntax//icode_generation.nit:196 */
@@ -1243,6 +1275,7 @@ void syntax___icode_generation___MMSrcAttribute___iroutine__eq(val_t p0, val_t p
   fra.me.meth = LOCATE_syntax___icode_generation___MMSrcAttribute___iroutine__eq;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
@@ -1263,6 +1296,7 @@ void syntax___icode_generation___MMSrcAttribute___generate_iroutine(val_t p0, va
   fra.me.meth = LOCATE_syntax___icode_generation___MMSrcAttribute___generate_iroutine;
   fra.me.has_broke = 0;
   fra.me.REG_size = 4;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -1329,6 +1363,7 @@ val_t syntax___icode_generation___MMSrcMethod___iroutine(val_t p0){
   fra.me.meth = LOCATE_syntax___icode_generation___MMSrcMethod___iroutine;
   fra.me.has_broke = 0;
   fra.me.REG_size = 1;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[0] = p0;
   /* ./syntax//icode_generation.nit:214 */
@@ -1345,6 +1380,7 @@ void syntax___icode_generation___MMSrcMethod___iroutine__eq(val_t p0, val_t p1){
   fra.me.meth = LOCATE_syntax___icode_generation___MMSrcMethod___iroutine__eq;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
@@ -1365,6 +1401,7 @@ void syntax___icode_generation___MMSrcMethod___generate_iroutine(val_t p0, val_t
   fra.me.meth = LOCATE_syntax___icode_generation___MMSrcMethod___generate_iroutine;
   fra.me.has_broke = 0;
   fra.me.REG_size = 4;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -1425,6 +1462,7 @@ void syntax___icode_generation___MMSrcMethod___inner_generate_iroutine(val_t p0,
   fra.me.meth = LOCATE_syntax___icode_generation___MMSrcMethod___inner_generate_iroutine;
   fra.me.has_broke = 0;
   fra.me.REG_size = 0;
+  fra.me.nitni_local_ref_head = NULL;
   /* ./syntax//icode_generation.nit:230 */
   nit_abort("Deferred method called", NULL, LOCATE_syntax___icode_generation, 230);
   stack_frame_head = fra.me.prev;
@@ -1440,6 +1478,7 @@ void syntax___icode_generation___MMReadImplementationMethod___inner_generate_iro
   fra.me.meth = LOCATE_syntax___icode_generation___MMReadImplementationMethod___inner_generate_iroutine;
   fra.me.has_broke = 0;
   fra.me.REG_size = 3;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -1471,6 +1510,7 @@ void syntax___icode_generation___MMWriteImplementationMethod___inner_generate_ir
   fra.me.meth = LOCATE_syntax___icode_generation___MMWriteImplementationMethod___inner_generate_iroutine;
   fra.me.has_broke = 0;
   fra.me.REG_size = 4;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -1505,6 +1545,7 @@ void syntax___icode_generation___MMMethSrcMethod___inner_generate_iroutine(val_t
   fra.me.meth = LOCATE_syntax___icode_generation___MMMethSrcMethod___inner_generate_iroutine;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
@@ -1532,6 +1573,7 @@ void syntax___icode_generation___MMImplicitInit___inner_generate_iroutine(val_t
   fra.me.meth = LOCATE_syntax___icode_generation___MMImplicitInit___inner_generate_iroutine;
   fra.me.has_broke = 0;
   fra.me.REG_size = 10;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -1550,37 +1592,37 @@ void syntax___icode_generation___MMImplicitInit___inner_generate_iroutine(val_t
   /* ./syntax//icode_generation.nit:261 */
   REGB0 = CALL_standard___collection___abstract_collection___Collection___length(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[3] = CALL_syntax___syntax_base___MMImplicitInit___unassigned_attributes(fra.me.REG[0])(fra.me.REG[0]);
-  /* ./../lib/standard//collection//array.nit:23 */
+  /* ./../lib/standard//collection//array.nit:24 */
   REGB1 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[3])!=NIT_NULL);
   if (UNTAG_Bool(REGB1)) {
   } else {
-    nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 23);
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 24);
   }
   REGB1 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[3]);
-  /* ./../lib/standard//kernel.nit:220 */
+  /* ./../lib/standard//kernel.nit:237 */
   REGB1 = TAG_Int(UNTAG_Int(REGB0)-UNTAG_Int(REGB1));
   /* ./syntax//icode_generation.nit:262 */
   fra.me.REG[3] = CALL_standard___collection___abstract_collection___Collection___first(fra.me.REG[2])(fra.me.REG[2]);
   /* ./syntax//icode_generation.nit:263 */
   fra.me.REG[4] = CALL_syntax___syntax_base___MMImplicitInit___super_inits(fra.me.REG[0])(fra.me.REG[0]);
-  /* ./../lib/standard//collection//array.nit:232 */
+  /* ./../lib/standard//collection//array.nit:269 */
   REGB0 = TAG_Int(0);
-  /* ./../lib/standard//collection//array.nit:233 */
+  /* ./../lib/standard//collection//array.nit:270 */
   REGB2 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[4])!=NIT_NULL);
   if (UNTAG_Bool(REGB2)) {
   } else {
-    nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 233);
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 270);
   }
   REGB2 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[4]);
-  /* ./../lib/standard//collection//array.nit:234 */
+  /* ./../lib/standard//collection//array.nit:271 */
   fra.me.REG[5] = ATTR_standard___collection___array___Array____items(fra.me.REG[4]);
-  /* ./../lib/standard//collection//array.nit:235 */
+  /* ./../lib/standard//collection//array.nit:272 */
   while(1) {
-    /* ./../lib/standard//collection//array.nit:23 */
+    /* ./../lib/standard//collection//array.nit:24 */
     REGB2 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[4])!=NIT_NULL);
     if (UNTAG_Bool(REGB2)) {
     } else {
-      nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 23);
+      nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 24);
     }
     REGB2 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[4]);
     REGB3 = TAG_Bool(VAL_ISA(REGB2, VTCOLOR_standard___kernel___Comparable___OTHER(REGB0), VTID_standard___kernel___Comparable___OTHER(REGB0))) /*cast OTHER*/;
@@ -1588,16 +1630,16 @@ void syntax___icode_generation___MMImplicitInit___inner_generate_iroutine(val_t
     } else {
       nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
     }
-    /* ./../lib/standard//kernel.nit:215 */
+    /* ./../lib/standard//kernel.nit:232 */
     REGB2 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB2));
-    /* ./../lib/standard//collection//array.nit:235 */
+    /* ./../lib/standard//collection//array.nit:272 */
     if (UNTAG_Bool(REGB2)) {
-      /* ./../lib/standard//collection//array.nit:236 */
+      /* ./../lib/standard//collection//array.nit:273 */
       REGB2 = TAG_Bool(fra.me.REG[5]==NIT_NULL);
       if (UNTAG_Bool(REGB2)) {
-        nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 236);
+        nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 273);
       }
-      /* ./../lib/standard//collection//array.nit:652 */
+      /* ./../lib/standard//collection//array.nit:718 */
       fra.me.REG[6] = ((Nit_NativeArray)fra.me.REG[5])->val[UNTAG_Int(REGB0)];
       /* ./syntax//icode_generation.nit:264 */
       REGB2 = TAG_Bool(VAL_ISA(fra.me.REG[6], COLOR_metamodel___abstractmetamodel___MMMethod, ID_metamodel___abstractmetamodel___MMMethod)) /*cast MMMethod*/;
@@ -1624,32 +1666,32 @@ void syntax___icode_generation___MMImplicitInit___inner_generate_iroutine(val_t
         CALL_standard___collection___abstract_collection___SimpleCollection___add(fra.me.REG[8])(fra.me.REG[8], fra.me.REG[3]);
         /* ./syntax//icode_generation.nit:269 */
         REGB2 = TAG_Int(1);
-        /* ./../lib/standard//kernel.nit:330 */
+        /* ./../lib/standard//kernel.nit:347 */
         REGB3 = REGB1;
-        /* ./../lib/standard//kernel.nit:335 */
+        /* ./../lib/standard//kernel.nit:352 */
         while(1) {
           REGB4 = TAG_Bool(VAL_ISA(REGB3, VTCOLOR_standard___kernel___Comparable___OTHER(REGB2), VTID_standard___kernel___Comparable___OTHER(REGB2))) /*cast OTHER*/;
           if (UNTAG_Bool(REGB4)) {
           } else {
             nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
           }
-          /* ./../lib/standard//kernel.nit:215 */
+          /* ./../lib/standard//kernel.nit:232 */
           REGB4 = TAG_Bool(UNTAG_Int(REGB2)<UNTAG_Int(REGB3));
-          /* ./../lib/standard//kernel.nit:335 */
+          /* ./../lib/standard//kernel.nit:352 */
           if (UNTAG_Bool(REGB4)) {
             /* ./syntax//icode_generation.nit:269 */
             REGB4 = REGB2;
             /* ./syntax//icode_generation.nit:270 */
             fra.me.REG[9] = CALL_standard___collection___abstract_collection___SequenceRead_____bra(fra.me.REG[2])(fra.me.REG[2], REGB4);
             CALL_standard___collection___abstract_collection___SimpleCollection___add(fra.me.REG[8])(fra.me.REG[8], fra.me.REG[9]);
-            /* ./../lib/standard//kernel.nit:337 */
+            /* ./../lib/standard//kernel.nit:354 */
             REGB4 = TAG_Int(1);
-            /* ./../lib/standard//kernel.nit:218 */
+            /* ./../lib/standard//kernel.nit:235 */
             REGB4 = TAG_Int(UNTAG_Int(REGB2)+UNTAG_Int(REGB4));
-            /* ./../lib/standard//kernel.nit:337 */
+            /* ./../lib/standard//kernel.nit:354 */
             REGB2 = REGB4;
           } else {
-            /* ./../lib/standard//kernel.nit:335 */
+            /* ./../lib/standard//kernel.nit:352 */
             goto label1;
           }
         }
@@ -1662,54 +1704,54 @@ void syntax___icode_generation___MMImplicitInit___inner_generate_iroutine(val_t
         fra.me.REG[7] = NEW_ICall_icode___icode_base___ICall___init(fra.me.REG[6], fra.me.REG[7]);
         CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[7]);
       }
-      /* ./../lib/standard//collection//array.nit:237 */
+      /* ./../lib/standard//collection//array.nit:274 */
       REGB2 = TAG_Int(1);
-      /* ./../lib/standard//kernel.nit:218 */
+      /* ./../lib/standard//kernel.nit:235 */
       REGB2 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB2));
-      /* ./../lib/standard//collection//array.nit:237 */
+      /* ./../lib/standard//collection//array.nit:274 */
       REGB0 = REGB2;
     } else {
-      /* ./../lib/standard//collection//array.nit:235 */
+      /* ./../lib/standard//collection//array.nit:272 */
       goto label2;
     }
   }
   label2: while(0);
   /* ./syntax//icode_generation.nit:277 */
   REGB0 = CALL_standard___collection___abstract_collection___Collection___length(fra.me.REG[2])(fra.me.REG[2]);
-  /* ./../lib/standard//kernel.nit:330 */
+  /* ./../lib/standard//kernel.nit:347 */
   REGB2 = REGB1;
-  /* ./../lib/standard//kernel.nit:335 */
+  /* ./../lib/standard//kernel.nit:352 */
   while(1) {
     REGB3 = TAG_Bool(VAL_ISA(REGB0, VTCOLOR_standard___kernel___Comparable___OTHER(REGB2), VTID_standard___kernel___Comparable___OTHER(REGB2))) /*cast OTHER*/;
     if (UNTAG_Bool(REGB3)) {
     } else {
       nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
     }
-    /* ./../lib/standard//kernel.nit:215 */
+    /* ./../lib/standard//kernel.nit:232 */
     REGB3 = TAG_Bool(UNTAG_Int(REGB2)<UNTAG_Int(REGB0));
-    /* ./../lib/standard//kernel.nit:335 */
+    /* ./../lib/standard//kernel.nit:352 */
     if (UNTAG_Bool(REGB3)) {
       /* ./syntax//icode_generation.nit:277 */
       REGB3 = REGB2;
       /* ./syntax//icode_generation.nit:278 */
       fra.me.REG[5] = CALL_syntax___syntax_base___MMImplicitInit___unassigned_attributes(fra.me.REG[0])(fra.me.REG[0]);
-      /* ./../lib/standard//kernel.nit:220 */
+      /* ./../lib/standard//kernel.nit:237 */
       REGB4 = TAG_Int(UNTAG_Int(REGB3)-UNTAG_Int(REGB1));
-      /* ./../lib/standard//collection//array.nit:243 */
+      /* ./../lib/standard//collection//array.nit:280 */
       REGB5 = TAG_Int(0);
       REGB6 = TAG_Bool(VAL_ISA(REGB5, VTCOLOR_standard___kernel___Comparable___OTHER(REGB4), VTID_standard___kernel___Comparable___OTHER(REGB4))) /*cast OTHER*/;
       if (UNTAG_Bool(REGB6)) {
       } else {
         nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
       }
-      /* ./../lib/standard//kernel.nit:216 */
+      /* ./../lib/standard//kernel.nit:233 */
       REGB5 = TAG_Bool(UNTAG_Int(REGB4)>=UNTAG_Int(REGB5));
-      /* ./../lib/standard//collection//array.nit:243 */
+      /* ./../lib/standard//collection//array.nit:280 */
       if (UNTAG_Bool(REGB5)) {
         REGB5 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[5])!=NIT_NULL);
         if (UNTAG_Bool(REGB5)) {
         } else {
-          nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 243);
+          nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 280);
         }
         REGB5 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[5]);
         REGB6 = TAG_Bool(VAL_ISA(REGB5, VTCOLOR_standard___kernel___Comparable___OTHER(REGB4), VTID_standard___kernel___Comparable___OTHER(REGB4))) /*cast OTHER*/;
@@ -1717,40 +1759,40 @@ void syntax___icode_generation___MMImplicitInit___inner_generate_iroutine(val_t
         } else {
           nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
         }
-        /* ./../lib/standard//kernel.nit:215 */
+        /* ./../lib/standard//kernel.nit:232 */
         REGB5 = TAG_Bool(UNTAG_Int(REGB4)<UNTAG_Int(REGB5));
       } else {
-        /* ./../lib/standard//collection//array.nit:243 */
+        /* ./../lib/standard//collection//array.nit:280 */
         REGB6 = TAG_Bool(false);
         REGB5 = REGB6;
       }
       if (UNTAG_Bool(REGB5)) {
       } else {
-        nit_abort("Assert %s  failed", "'index'", LOCATE_standard___collection___array, 243);
+        nit_abort("Assert %s  failed", "'index'", LOCATE_standard___collection___array, 280);
       }
-      /* ./../lib/standard//collection//array.nit:244 */
+      /* ./../lib/standard//collection//array.nit:281 */
       fra.me.REG[5] = ATTR_standard___collection___array___Array____items(fra.me.REG[5]);
       REGB5 = TAG_Bool(fra.me.REG[5]==NIT_NULL);
       if (UNTAG_Bool(REGB5)) {
-        nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 244);
+        nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 281);
       }
-      /* ./../lib/standard//collection//array.nit:652 */
+      /* ./../lib/standard//collection//array.nit:718 */
       fra.me.REG[5] = ((Nit_NativeArray)fra.me.REG[5])->val[UNTAG_Int(REGB4)];
-      /* ./../lib/standard//collection//array.nit:244 */
+      /* ./../lib/standard//collection//array.nit:281 */
       goto label3;
       label3: while(0);
       /* ./syntax//icode_generation.nit:279 */
       fra.me.REG[4] = CALL_standard___collection___abstract_collection___SequenceRead_____bra(fra.me.REG[2])(fra.me.REG[2], REGB3);
       fra.me.REG[4] = NEW_IAttrWrite_icode___icode_base___IAttrWrite___init(fra.me.REG[5], fra.me.REG[3], fra.me.REG[4]);
       CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4]);
-      /* ./../lib/standard//kernel.nit:337 */
+      /* ./../lib/standard//kernel.nit:354 */
       REGB3 = TAG_Int(1);
-      /* ./../lib/standard//kernel.nit:218 */
+      /* ./../lib/standard//kernel.nit:235 */
       REGB3 = TAG_Int(UNTAG_Int(REGB2)+UNTAG_Int(REGB3));
-      /* ./../lib/standard//kernel.nit:337 */
+      /* ./../lib/standard//kernel.nit:354 */
       REGB2 = REGB3;
     } else {
-      /* ./../lib/standard//kernel.nit:335 */
+      /* ./../lib/standard//kernel.nit:352 */
       goto label4;
     }
   }
@@ -1767,6 +1809,7 @@ void syntax___icode_generation___A2IVisitor___icode_ctx__eq(val_t p0, val_t p1){
   fra.me.meth = LOCATE_syntax___icode_generation___A2IVisitor___icode_ctx__eq;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
@@ -1786,6 +1829,7 @@ val_t syntax___icode_generation___A2IVisitor___icode_ctx(val_t p0){
   fra.me.meth = LOCATE_syntax___icode_generation___A2IVisitor___icode_ctx;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
@@ -1812,6 +1856,7 @@ void syntax___icode_generation___A2IVisitor___visit(val_t p0, val_t p1){
   fra.me.meth = LOCATE_syntax___icode_generation___A2IVisitor___visit;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
@@ -1836,6 +1881,7 @@ void syntax___icode_generation___A2IVisitor___init(val_t p0, val_t p1, val_t p2,
   fra.me.meth = LOCATE_syntax___icode_generation___A2IVisitor___init;
   fra.me.has_broke = 0;
   fra.me.REG_size = 3;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -1857,6 +1903,7 @@ void syntax___icode_generation___ANode___accept_icode_generation(val_t p0, val_t
   fra.me.meth = LOCATE_syntax___icode_generation___ANode___accept_icode_generation;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
@@ -1877,6 +1924,7 @@ void syntax___icode_generation___AAttrPropdef___accept_icode_generation(val_t p0
   fra.me.meth = LOCATE_syntax___icode_generation___AAttrPropdef___accept_icode_generation;
   fra.me.has_broke = 0;
   fra.me.REG_size = 6;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -1941,6 +1989,7 @@ void syntax___icode_generation___AMethPropdef___accept_icode_generation(val_t p0
   fra.me.meth = LOCATE_syntax___icode_generation___AMethPropdef___accept_icode_generation;
   fra.me.has_broke = 0;
   fra.me.REG_size = 4;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -1968,6 +2017,7 @@ void syntax___icode_generation___AMethPropdef___fill_iroutine(val_t p0, val_t p1
   fra.me.meth = LOCATE_syntax___icode_generation___AMethPropdef___fill_iroutine;
   fra.me.has_broke = 0;
   fra.me.REG_size = 0;
+  fra.me.nitni_local_ref_head = NULL;
   /* ./syntax//icode_generation.nit:319 */
   nit_abort("Deferred method called", NULL, LOCATE_syntax___icode_generation, 319);
   stack_frame_head = fra.me.prev;
@@ -1986,6 +2036,7 @@ void syntax___icode_generation___ASignature___fill_iroutine_parameters(val_t p0,
   fra.me.meth = LOCATE_syntax___icode_generation___ASignature___fill_iroutine_parameters;
   fra.me.has_broke = 0;
   fra.me.REG_size = 7;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -2007,16 +2058,16 @@ void syntax___icode_generation___ASignature___fill_iroutine_parameters(val_t p0,
   REGB0 = TAG_Int(0);
   fra.me.REG[3] = CALL_parser___parser_nodes___ASignature___n_closure_decls(fra.me.REG[5])(fra.me.REG[5]);
   REGB1 = CALL_standard___collection___abstract_collection___Collection___length(fra.me.REG[3])(fra.me.REG[3]);
-  /* ./../lib/standard//kernel.nit:335 */
+  /* ./../lib/standard//kernel.nit:352 */
   while(1) {
     REGB2 = TAG_Bool(VAL_ISA(REGB1, VTCOLOR_standard___kernel___Comparable___OTHER(REGB0), VTID_standard___kernel___Comparable___OTHER(REGB0))) /*cast OTHER*/;
     if (UNTAG_Bool(REGB2)) {
     } else {
       nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
     }
-    /* ./../lib/standard//kernel.nit:215 */
+    /* ./../lib/standard//kernel.nit:232 */
     REGB2 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB1));
-    /* ./../lib/standard//kernel.nit:335 */
+    /* ./../lib/standard//kernel.nit:352 */
     if (UNTAG_Bool(REGB2)) {
       /* ./syntax//icode_generation.nit:335 */
       REGB2 = REGB0;
@@ -2032,14 +2083,14 @@ void syntax___icode_generation___ASignature___fill_iroutine_parameters(val_t p0,
       }
       fra.me.REG[2] = CALL_standard___collection___abstract_collection___SequenceRead_____bra(fra.me.REG[4])(fra.me.REG[4], REGB2);
       CALL_standard___collection___abstract_collection___Map_____braeq(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[3], fra.me.REG[2]);
-      /* ./../lib/standard//kernel.nit:337 */
+      /* ./../lib/standard//kernel.nit:354 */
       REGB2 = TAG_Int(1);
-      /* ./../lib/standard//kernel.nit:218 */
+      /* ./../lib/standard//kernel.nit:235 */
       REGB2 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB2));
-      /* ./../lib/standard//kernel.nit:337 */
+      /* ./../lib/standard//kernel.nit:354 */
       REGB0 = REGB2;
     } else {
-      /* ./../lib/standard//kernel.nit:335 */
+      /* ./../lib/standard//kernel.nit:352 */
       goto label2;
     }
   }
@@ -2058,6 +2109,7 @@ void syntax___icode_generation___ASignature___fill_iroutine_parameters(val_t p0,
     fra.me.meth = LOCATE_syntax___icode_generation___ASignature___fill_iroutine_parameters;
     fra.me.has_broke = 0;
     fra.me.REG_size = 4;
+    fra.me.nitni_local_ref_head = NULL;
     fra.me.REG[0] = NIT_NULL;
     fra.me.REG[1] = NIT_NULL;
     fra.me.REG[2] = NIT_NULL;
@@ -2108,6 +2160,7 @@ void syntax___icode_generation___AClosureDecl___accept_icode_generation(val_t p0
   fra.me.meth = LOCATE_syntax___icode_generation___AClosureDecl___accept_icode_generation;
   fra.me.has_broke = 0;
   fra.me.REG_size = 8;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -2254,6 +2307,7 @@ void syntax___icode_generation___AConcreteMethPropdef___fill_iroutine(val_t p0,
   fra.me.meth = LOCATE_syntax___icode_generation___AConcreteMethPropdef___fill_iroutine;
   fra.me.has_broke = 0;
   fra.me.REG_size = 6;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -2272,23 +2326,23 @@ void syntax___icode_generation___AConcreteMethPropdef___fill_iroutine(val_t p0,
   fra.me.REG[4] = CALL_syntax___icode_generation___A2IContext___variable(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4]);
   /* ./syntax//icode_generation.nit:373 */
   REGB0 = TAG_Int(0);
-  /* ./../lib/standard//collection//array.nit:241 */
+  /* ./../lib/standard//collection//array.nit:278 */
   fra.me.REG[5] = fra.me.REG[3];
-  /* ./../lib/standard//collection//array.nit:243 */
+  /* ./../lib/standard//collection//array.nit:280 */
   REGB1 = TAG_Int(0);
   REGB2 = TAG_Bool(VAL_ISA(REGB1, VTCOLOR_standard___kernel___Comparable___OTHER(REGB0), VTID_standard___kernel___Comparable___OTHER(REGB0))) /*cast OTHER*/;
   if (UNTAG_Bool(REGB2)) {
   } else {
     nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
   }
-  /* ./../lib/standard//kernel.nit:216 */
+  /* ./../lib/standard//kernel.nit:233 */
   REGB1 = TAG_Bool(UNTAG_Int(REGB0)>=UNTAG_Int(REGB1));
-  /* ./../lib/standard//collection//array.nit:243 */
+  /* ./../lib/standard//collection//array.nit:280 */
   if (UNTAG_Bool(REGB1)) {
     REGB1 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[5])!=NIT_NULL);
     if (UNTAG_Bool(REGB1)) {
     } else {
-      nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 243);
+      nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 280);
     }
     REGB1 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[5]);
     REGB2 = TAG_Bool(VAL_ISA(REGB1, VTCOLOR_standard___kernel___Comparable___OTHER(REGB0), VTID_standard___kernel___Comparable___OTHER(REGB0))) /*cast OTHER*/;
@@ -2296,26 +2350,26 @@ void syntax___icode_generation___AConcreteMethPropdef___fill_iroutine(val_t p0,
     } else {
       nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
     }
-    /* ./../lib/standard//kernel.nit:215 */
+    /* ./../lib/standard//kernel.nit:232 */
     REGB1 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB1));
   } else {
-    /* ./../lib/standard//collection//array.nit:243 */
+    /* ./../lib/standard//collection//array.nit:280 */
     REGB2 = TAG_Bool(false);
     REGB1 = REGB2;
   }
   if (UNTAG_Bool(REGB1)) {
   } else {
-    nit_abort("Assert %s  failed", "'index'", LOCATE_standard___collection___array, 243);
+    nit_abort("Assert %s  failed", "'index'", LOCATE_standard___collection___array, 280);
   }
-  /* ./../lib/standard//collection//array.nit:244 */
+  /* ./../lib/standard//collection//array.nit:281 */
   fra.me.REG[5] = ATTR_standard___collection___array___Array____items(fra.me.REG[5]);
   REGB1 = TAG_Bool(fra.me.REG[5]==NIT_NULL);
   if (UNTAG_Bool(REGB1)) {
-    nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 244);
+    nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 281);
   }
-  /* ./../lib/standard//collection//array.nit:652 */
+  /* ./../lib/standard//collection//array.nit:718 */
   fra.me.REG[5] = ((Nit_NativeArray)fra.me.REG[5])->val[UNTAG_Int(REGB0)];
-  /* ./../lib/standard//collection//array.nit:244 */
+  /* ./../lib/standard//collection//array.nit:281 */
   goto label1;
   label1: while(0);
   /* ./syntax//icode_generation.nit:373 */
@@ -2393,6 +2447,162 @@ void syntax___icode_generation___AConcreteMethPropdef___fill_iroutine(val_t p0,
   stack_frame_head = fra.me.prev;
   return;
 }
+void syntax___icode_generation___AExternPropdef___fill_iroutine(val_t p0, val_t p1, val_t p2){
+  struct {struct stack_frame_t me; val_t MORE_REG[2];} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_syntax___icode_generation;
+  fra.me.line = 395;
+  fra.me.meth = LOCATE_syntax___icode_generation___AExternPropdef___fill_iroutine;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 3;
+  fra.me.nitni_local_ref_head = NULL;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  fra.me.REG[2] = p2;
+  /* ./syntax//icode_generation.nit:398 */
+  REGB0 = TAG_Bool(VAL_ISA(fra.me.REG[2], COLOR_syntax___syntax_base___MMMethSrcMethod, ID_syntax___syntax_base___MMMethSrcMethod)) /*cast MMMethSrcMethod*/;
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 398);
+  }
+  fra.me.REG[2] = CALL_metamodel___abstractmetamodel___MMMethod___explicit_imports(fra.me.REG[2])(fra.me.REG[2]);
+  CALL_standard___collection___abstract_collection___Collection___iterate(fra.me.REG[2])(fra.me.REG[2], (&(fra.me)), ((fun_t)OC_syntax___icode_generation___AExternPropdef___fill_iroutine_1));
+  stack_frame_head = fra.me.prev;
+  return;
+}
+  void OC_syntax___icode_generation___AExternPropdef___fill_iroutine_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[2];} 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_syntax___icode_generation;
+    fra.me.line = 0;
+    fra.me.meth = LOCATE_syntax___icode_generation___AExternPropdef___fill_iroutine;
+    fra.me.has_broke = 0;
+    fra.me.REG_size = 3;
+    fra.me.nitni_local_ref_head = NULL;
+    fra.me.REG[0] = NIT_NULL;
+    fra.me.REG[1] = NIT_NULL;
+    fra.me.REG[2] = NIT_NULL;
+    fra.me.closure_ctx = closctx_param;
+    fra.me.closure_funs = CREG;
+    fra.me.REG[0] = p0;
+    CREG[0] = clos_fun0;
+    /* ./syntax//icode_generation.nit:400 */
+    fra.me.REG[0] = CALL_metamodel___abstractmetamodel___MMExplicitImport___method(fra.me.REG[0])(fra.me.REG[0]);
+    /* ./syntax//icode_generation.nit:402 */
+    REGB0 = CALL_syntax___syntax_base___MMLocalProperty___is_init(fra.me.REG[0])(fra.me.REG[0]);
+    if (UNTAG_Bool(REGB0)) {
+      /* ./syntax//icode_generation.nit:403 */
+      fra.me.REG[1] = CALL_metamodel___static_type___MMLocalProperty___signature(fra.me.REG[0])(fra.me.REG[0]);
+      REGB0 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
+      if (UNTAG_Bool(REGB0)) {
+        nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 403);
+      }
+      fra.me.REG[1] = CALL_metamodel___static_type___MMSignature___recv(fra.me.REG[1])(fra.me.REG[1]);
+      fra.me.REG[2] = NEW_List_standard___collection___list___List___init();
+      fra.me.REG[2] = NEW_INew_icode___icode_base___INew___init(fra.me.REG[1], fra.me.REG[0], fra.me.REG[2]);
+    } else {
+      /* ./syntax//icode_generation.nit:405 */
+      fra.me.REG[1] = NEW_List_standard___collection___list___List___init();
+      fra.me.REG[1] = NEW_ICall_icode___icode_base___ICall___init(fra.me.REG[0], fra.me.REG[1]);
+      fra.me.REG[2] = fra.me.REG[1];
+    }
+    /* ./syntax//icode_generation.nit:407 */
+    REGB0 = TAG_Bool(true);
+    CALL_icode___icode_base___IAbsCall___is_explicit_from_extern__eq(fra.me.REG[2])(fra.me.REG[2], REGB0);
+    /* ./syntax//icode_generation.nit:408 */
+    CALL_icode___icode_builder___ICodeBuilder___stmt(closctx->REG[1])(closctx->REG[1], fra.me.REG[2]);
+    stack_frame_head = fra.me.prev;
+    return;
+  }
+void syntax___icode_generation___AExternInitPropdef___fill_iroutine(val_t p0, val_t p1, val_t p2){
+  struct {struct stack_frame_t me; val_t MORE_REG[7];} 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_syntax___icode_generation;
+  fra.me.line = 414;
+  fra.me.meth = LOCATE_syntax___icode_generation___AExternInitPropdef___fill_iroutine;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 8;
+  fra.me.nitni_local_ref_head = NULL;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[3] = NIT_NULL;
+  fra.me.REG[4] = NIT_NULL;
+  fra.me.REG[5] = NIT_NULL;
+  fra.me.REG[6] = NIT_NULL;
+  fra.me.REG[7] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  fra.me.REG[2] = p2;
+  /* ./syntax//icode_generation.nit:414 */
+  fra.me.REG[3] = fra.me.REG[1];
+  fra.me.REG[4] = fra.me.REG[2];
+  /* ./syntax//icode_generation.nit:416 */
+  fra.me.REG[5] = CALL_icode___icode_builder___ICodeBuilder___iroutine(fra.me.REG[3])(fra.me.REG[3]);
+  fra.me.REG[5] = CALL_icode___icode_base___IRoutine___params(fra.me.REG[5])(fra.me.REG[5]);
+  /* ./syntax//icode_generation.nit:417 */
+  fra.me.REG[6] = CALL_metamodel___static_type___MMLocalProperty___signature(fra.me.REG[4])(fra.me.REG[4]);
+  /* ./syntax//icode_generation.nit:418 */
+  REGB0 = CALL_standard___collection___abstract_collection___Collection___length(fra.me.REG[5])(fra.me.REG[5]);
+  REGB1 = TAG_Bool(fra.me.REG[6]==NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 418);
+  }
+  REGB1 = CALL_metamodel___static_type___MMSignature___arity(fra.me.REG[6])(fra.me.REG[6]);
+  REGB2 = TAG_Int(1);
+  /* ./../lib/standard//kernel.nit:235 */
+  REGB2 = TAG_Int(UNTAG_Int(REGB1)+UNTAG_Int(REGB2));
+  /* ./syntax//icode_generation.nit:418 */
+  REGB1 = TAG_Bool(IS_EQUAL_OO(REGB0,REGB2));
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    /* ./../lib/standard//kernel.nit:227 */
+    REGB2 = TAG_Bool((REGB0)==(REGB2));
+    /* ./syntax//icode_generation.nit:418 */
+    REGB1 = REGB2;
+  }
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Assert failed", NULL, LOCATE_syntax___icode_generation, 418);
+  }
+  /* ./syntax//icode_generation.nit:419 */
+  REGB1 = TAG_Bool(fra.me.REG[6]==NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 419);
+  }
+  fra.me.REG[6] = CALL_metamodel___static_type___MMSignature___recv(fra.me.REG[6])(fra.me.REG[6]);
+  /* ./syntax//icode_generation.nit:420 */
+  REGB1 = TAG_Bool(0);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    REGB2 = CALL_standard___kernel___Object_____eqeq(fra.me.REG[6])(fra.me.REG[6], NIT_NULL);
+    REGB1 = REGB2;
+  }
+  REGB1 = TAG_Bool(!UNTAG_Bool(REGB1));
+  if (UNTAG_Bool(REGB1)) {
+    /* ./syntax//icode_generation.nit:421 */
+    fra.me.REG[7] = NEW_IRegister_icode___icode_base___IRegister___init(fra.me.REG[6]);
+    fra.me.REG[5] = NEW_INative_icode___icode_base___INative___init(fra.me.REG[4], fra.me.REG[5]);
+    fra.me.REG[6] = CALL_icode___icode_builder___ICodeBuilder___expr(fra.me.REG[3])(fra.me.REG[3], fra.me.REG[5], fra.me.REG[6]);
+    CALL_icode___icode_builder___ICodeBuilder___add_assignment(fra.me.REG[3])(fra.me.REG[3], fra.me.REG[7], fra.me.REG[6]);
+  }
+  /* ./syntax//icode_generation.nit:424 */
+  CALL_SUPER_syntax___icode_generation___AExternInitPropdef___fill_iroutine(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1], fra.me.REG[2]);
+  stack_frame_head = fra.me.prev;
+  return;
+}
 void syntax___icode_generation___ADeferredMethPropdef___fill_iroutine(val_t p0, val_t p1, val_t p2){
   struct {struct stack_frame_t me; val_t MORE_REG[2];} fra;
   val_t REGB0;
@@ -2400,17 +2610,18 @@ void syntax___icode_generation___ADeferredMethPropdef___fill_iroutine(val_t p0,
   static val_t once_value_1; /* Once value */
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 395;
+  fra.me.line = 429;
   fra.me.meth = LOCATE_syntax___icode_generation___ADeferredMethPropdef___fill_iroutine;
   fra.me.has_broke = 0;
   fra.me.REG_size = 3;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
   fra.me.REG[2] = p2;
-  /* ./syntax//icode_generation.nit:397 */
+  /* ./syntax//icode_generation.nit:431 */
   REGB0 = TAG_Int(0);
   fra.me.REG[2] = NEW_Array_standard___collection___array___Array___with_capacity(REGB0);
   if (!once_value_1) {
@@ -2427,58 +2638,67 @@ void syntax___icode_generation___ADeferredMethPropdef___fill_iroutine(val_t p0,
   return;
 }
 void syntax___icode_generation___AExternMethPropdef___fill_iroutine(val_t p0, val_t p1, val_t p2){
-  struct {struct stack_frame_t me; val_t MORE_REG[4];} fra;
+  struct {struct stack_frame_t me; val_t MORE_REG[7];} 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_syntax___icode_generation;
-  fra.me.line = 402;
+  fra.me.line = 436;
   fra.me.meth = LOCATE_syntax___icode_generation___AExternMethPropdef___fill_iroutine;
   fra.me.has_broke = 0;
-  fra.me.REG_size = 5;
+  fra.me.REG_size = 8;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
   fra.me.REG[3] = NIT_NULL;
   fra.me.REG[4] = NIT_NULL;
+  fra.me.REG[5] = NIT_NULL;
+  fra.me.REG[6] = NIT_NULL;
+  fra.me.REG[7] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
   fra.me.REG[2] = p2;
-  /* ./syntax//icode_generation.nit:404 */
-  fra.me.REG[0] = CALL_icode___icode_builder___ICodeBuilder___iroutine(fra.me.REG[1])(fra.me.REG[1]);
-  fra.me.REG[0] = CALL_icode___icode_base___IRoutine___params(fra.me.REG[0])(fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:405 */
-  fra.me.REG[3] = CALL_metamodel___static_type___MMLocalProperty___signature(fra.me.REG[2])(fra.me.REG[2]);
-  REGB0 = TAG_Bool(fra.me.REG[3]==NIT_NULL);
+  /* ./syntax//icode_generation.nit:436 */
+  fra.me.REG[3] = fra.me.REG[1];
+  fra.me.REG[4] = fra.me.REG[2];
+  /* ./syntax//icode_generation.nit:438 */
+  fra.me.REG[5] = CALL_icode___icode_builder___ICodeBuilder___iroutine(fra.me.REG[3])(fra.me.REG[3]);
+  fra.me.REG[5] = CALL_icode___icode_base___IRoutine___params(fra.me.REG[5])(fra.me.REG[5]);
+  /* ./syntax//icode_generation.nit:439 */
+  fra.me.REG[6] = CALL_metamodel___static_type___MMLocalProperty___signature(fra.me.REG[4])(fra.me.REG[4]);
+  REGB0 = TAG_Bool(fra.me.REG[6]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
-    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 405);
+    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 439);
   }
-  fra.me.REG[3] = CALL_metamodel___static_type___MMSignature___return_type(fra.me.REG[3])(fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:406 */
-  REGB0 = TAG_Bool(fra.me.REG[3]==NIT_NULL);
+  fra.me.REG[6] = CALL_metamodel___static_type___MMSignature___return_type(fra.me.REG[6])(fra.me.REG[6]);
+  /* ./syntax//icode_generation.nit:440 */
+  REGB0 = TAG_Bool(fra.me.REG[6]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    REGB1 = TAG_Bool(fra.me.REG[3]==NIT_NULL);
+    REGB1 = TAG_Bool(fra.me.REG[6]==NIT_NULL);
     if (UNTAG_Bool(REGB1)) {
       REGB1 = TAG_Bool(false);
       REGB0 = REGB1;
     } else {
-      REGB1 = CALL_standard___kernel___Object_____eqeq(fra.me.REG[3])(fra.me.REG[3], NIT_NULL);
+      REGB1 = CALL_standard___kernel___Object_____eqeq(fra.me.REG[6])(fra.me.REG[6], NIT_NULL);
       REGB0 = REGB1;
     }
   }
   REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
   if (UNTAG_Bool(REGB0)) {
-    /* ./syntax//icode_generation.nit:407 */
-    fra.me.REG[4] = NEW_INative_icode___icode_base___INative___init(fra.me.REG[2], fra.me.REG[0]);
-    fra.me.REG[3] = CALL_icode___icode_builder___ICodeBuilder___expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4], fra.me.REG[3]);
-    CALL_icode___icode_builder___ICodeBuilder___add_return_value(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
+    /* ./syntax//icode_generation.nit:441 */
+    fra.me.REG[7] = NEW_INative_icode___icode_base___INative___init(fra.me.REG[4], fra.me.REG[5]);
+    fra.me.REG[6] = CALL_icode___icode_builder___ICodeBuilder___expr(fra.me.REG[3])(fra.me.REG[3], fra.me.REG[7], fra.me.REG[6]);
+    CALL_icode___icode_builder___ICodeBuilder___add_return_value(fra.me.REG[3])(fra.me.REG[3], fra.me.REG[6]);
   } else {
-    /* ./syntax//icode_generation.nit:409 */
-    fra.me.REG[0] = NEW_INative_icode___icode_base___INative___init(fra.me.REG[2], fra.me.REG[0]);
-    CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
+    /* ./syntax//icode_generation.nit:443 */
+    fra.me.REG[5] = NEW_INative_icode___icode_base___INative___init(fra.me.REG[4], fra.me.REG[5]);
+    CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[3])(fra.me.REG[3], fra.me.REG[5]);
   }
+  /* ./syntax//icode_generation.nit:446 */
+  CALL_SUPER_syntax___icode_generation___AExternMethPropdef___fill_iroutine(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1], fra.me.REG[2]);
   stack_frame_head = fra.me.prev;
   return;
 }
@@ -2489,10 +2709,11 @@ void syntax___icode_generation___AInternMethPropdef___fill_iroutine(val_t p0, va
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 415;
+  fra.me.line = 451;
   fra.me.meth = LOCATE_syntax___icode_generation___AInternMethPropdef___fill_iroutine;
   fra.me.has_broke = 0;
   fra.me.REG_size = 5;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -2501,17 +2722,17 @@ void syntax___icode_generation___AInternMethPropdef___fill_iroutine(val_t p0, va
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
   fra.me.REG[2] = p2;
-  /* ./syntax//icode_generation.nit:417 */
+  /* ./syntax//icode_generation.nit:453 */
   fra.me.REG[0] = CALL_icode___icode_builder___ICodeBuilder___iroutine(fra.me.REG[1])(fra.me.REG[1]);
   fra.me.REG[0] = CALL_icode___icode_base___IRoutine___params(fra.me.REG[0])(fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:418 */
+  /* ./syntax//icode_generation.nit:454 */
   fra.me.REG[3] = CALL_metamodel___static_type___MMLocalProperty___signature(fra.me.REG[2])(fra.me.REG[2]);
   REGB0 = TAG_Bool(fra.me.REG[3]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
-    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 418);
+    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 454);
   }
   fra.me.REG[3] = CALL_metamodel___static_type___MMSignature___return_type(fra.me.REG[3])(fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:419 */
+  /* ./syntax//icode_generation.nit:455 */
   REGB0 = TAG_Bool(fra.me.REG[3]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
@@ -2526,12 +2747,12 @@ void syntax___icode_generation___AInternMethPropdef___fill_iroutine(val_t p0, va
   }
   REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
   if (UNTAG_Bool(REGB0)) {
-    /* ./syntax//icode_generation.nit:420 */
+    /* ./syntax//icode_generation.nit:456 */
     fra.me.REG[4] = NEW_INative_icode___icode_base___INative___init(fra.me.REG[2], fra.me.REG[0]);
     fra.me.REG[3] = CALL_icode___icode_builder___ICodeBuilder___expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4], fra.me.REG[3]);
     CALL_icode___icode_builder___ICodeBuilder___add_return_value(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
   } else {
-    /* ./syntax//icode_generation.nit:422 */
+    /* ./syntax//icode_generation.nit:458 */
     fra.me.REG[0] = NEW_INative_icode___icode_base___INative___init(fra.me.REG[2], fra.me.REG[0]);
     CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
   }
@@ -2543,10 +2764,11 @@ void syntax___icode_generation___AExpr___accept_icode_generation(val_t p0, val_t
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 430;
+  fra.me.line = 466;
   fra.me.meth = LOCATE_syntax___icode_generation___AExpr___accept_icode_generation;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
@@ -2559,12 +2781,13 @@ val_t syntax___icode_generation___AExpr___generate_icode(val_t p0, val_t p1){
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 432;
+  fra.me.line = 468;
   fra.me.meth = LOCATE_syntax___icode_generation___AExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 0;
-  /* ./syntax//icode_generation.nit:432 */
-  nit_abort("Deferred method called", NULL, LOCATE_syntax___icode_generation, 432);
+  fra.me.nitni_local_ref_head = NULL;
+  /* ./syntax//icode_generation.nit:468 */
+  nit_abort("Deferred method called", NULL, LOCATE_syntax___icode_generation, 468);
   stack_frame_head = fra.me.prev;
   return NIT_NULL;
 }
@@ -2575,21 +2798,22 @@ val_t syntax___icode_generation___AVardeclExpr___generate_icode(val_t p0, val_t
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 438;
+  fra.me.line = 474;
   fra.me.meth = LOCATE_syntax___icode_generation___AVardeclExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 3;
+  fra.me.nitni_local_ref_head = NULL;
   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;
-  /* ./syntax//icode_generation.nit:440 */
+  /* ./syntax//icode_generation.nit:476 */
   fra.me.REG[2] = CALL_syntax___syntax_base___AVardeclExpr___variable(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[2] = CALL_syntax___icode_generation___A2IContext___variable(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:441 */
+  /* ./syntax//icode_generation.nit:477 */
   fra.me.REG[0] = CALL_parser___parser_nodes___AVardeclExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:442 */
+  /* ./syntax//icode_generation.nit:478 */
   REGB0 = TAG_Bool(fra.me.REG[0]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
@@ -2604,11 +2828,11 @@ val_t syntax___icode_generation___AVardeclExpr___generate_icode(val_t p0, val_t
   }
   REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
   if (UNTAG_Bool(REGB0)) {
-    /* ./syntax//icode_generation.nit:443 */
+    /* ./syntax//icode_generation.nit:479 */
     fra.me.REG[0] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
     CALL_icode___icode_builder___ICodeBuilder___add_assignment(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2], fra.me.REG[0]);
   }
-  /* ./syntax//icode_generation.nit:445 */
+  /* ./syntax//icode_generation.nit:481 */
   fra.me.REG[0] = NIT_NULL;
   goto label1;
   label1: while(0);
@@ -2620,18 +2844,19 @@ val_t syntax___icode_generation___ABlockExpr___generate_icode(val_t p0, val_t p1
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 450;
+  fra.me.line = 486;
   fra.me.meth = LOCATE_syntax___icode_generation___ABlockExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:452 */
+  /* ./syntax//icode_generation.nit:488 */
   fra.me.REG[0] = CALL_parser___parser_nodes___ABlockExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
   CALL_standard___collection___abstract_collection___Collection___iterate(fra.me.REG[0])(fra.me.REG[0], (&(fra.me)), ((fun_t)OC_syntax___icode_generation___ABlockExpr___generate_icode_1));
-  /* ./syntax//icode_generation.nit:453 */
+  /* ./syntax//icode_generation.nit:489 */
   fra.me.REG[1] = NIT_NULL;
   goto label2;
   label2: while(0);
@@ -2648,6 +2873,7 @@ val_t syntax___icode_generation___ABlockExpr___generate_icode(val_t p0, val_t p1
     fra.me.meth = LOCATE_syntax___icode_generation___ABlockExpr___generate_icode;
     fra.me.has_broke = 0;
     fra.me.REG_size = 1;
+    fra.me.nitni_local_ref_head = NULL;
     fra.me.REG[0] = NIT_NULL;
     fra.me.closure_ctx = closctx_param;
     fra.me.closure_funs = CREG;
@@ -2663,10 +2889,11 @@ val_t syntax___icode_generation___ADoExpr___generate_icode(val_t p0, val_t p1){
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 458;
+  fra.me.line = 494;
   fra.me.meth = LOCATE_syntax___icode_generation___ADoExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 5;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -2674,27 +2901,27 @@ val_t syntax___icode_generation___ADoExpr___generate_icode(val_t p0, val_t p1){
   fra.me.REG[4] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:460 */
+  /* ./syntax//icode_generation.nit:496 */
   fra.me.REG[2] = CALL_icode___icode_builder___ICodeBuilder___seq(fra.me.REG[1])(fra.me.REG[1]);
-  /* ./syntax//icode_generation.nit:461 */
+  /* ./syntax//icode_generation.nit:497 */
   fra.me.REG[3] = NEW_ISeq_icode___icode_base___ISeq___init();
-  /* ./syntax//icode_generation.nit:462 */
+  /* ./syntax//icode_generation.nit:498 */
   CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:463 */
+  /* ./syntax//icode_generation.nit:499 */
   fra.me.REG[4] = CALL_syntax___typing___AAbsControl___escapable(fra.me.REG[0])(fra.me.REG[0]);
   REGB0 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
-    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 463);
+    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 499);
   }
   CALL_syntax___icode_generation___EscapableBlock___break_seq__eq(fra.me.REG[4])(fra.me.REG[4], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:464 */
+  /* ./syntax//icode_generation.nit:500 */
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:466 */
+  /* ./syntax//icode_generation.nit:502 */
   fra.me.REG[0] = CALL_parser___parser_nodes___ADoExpr___n_block(fra.me.REG[0])(fra.me.REG[0]);
   CALL_syntax___icode_generation___A2IContext___generate_stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:468 */
+  /* ./syntax//icode_generation.nit:504 */
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:469 */
+  /* ./syntax//icode_generation.nit:505 */
   fra.me.REG[2] = NIT_NULL;
   goto label1;
   label1: while(0);
@@ -2708,21 +2935,22 @@ val_t syntax___icode_generation___AReturnExpr___generate_icode(val_t p0, val_t p
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 474;
+  fra.me.line = 510;
   fra.me.meth = LOCATE_syntax___icode_generation___AReturnExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 4;
+  fra.me.nitni_local_ref_head = NULL;
   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;
-  /* ./syntax//icode_generation.nit:474 */
+  /* ./syntax//icode_generation.nit:510 */
   fra.me.REG[2] = fra.me.REG[0];
-  /* ./syntax//icode_generation.nit:476 */
+  /* ./syntax//icode_generation.nit:512 */
   fra.me.REG[2] = CALL_parser___parser_nodes___AReturnExpr___n_expr(fra.me.REG[2])(fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:477 */
+  /* ./syntax//icode_generation.nit:513 */
   REGB0 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
@@ -2737,25 +2965,25 @@ val_t syntax___icode_generation___AReturnExpr___generate_icode(val_t p0, val_t p
   }
   REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
   if (UNTAG_Bool(REGB0)) {
-    /* ./syntax//icode_generation.nit:478 */
+    /* ./syntax//icode_generation.nit:514 */
     fra.me.REG[3] = CALL_syntax___icode_generation___A2IContext___return_value(fra.me.REG[1])(fra.me.REG[1]);
     REGB0 = TAG_Bool(fra.me.REG[3]!=NIT_NULL);
     if (UNTAG_Bool(REGB0)) {
     } else {
-      nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 478);
+      nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 514);
     }
     fra.me.REG[2] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
     CALL_icode___icode_builder___ICodeBuilder___add_assignment(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3], fra.me.REG[2]);
   }
-  /* ./syntax//icode_generation.nit:480 */
+  /* ./syntax//icode_generation.nit:516 */
   fra.me.REG[2] = CALL_syntax___icode_generation___A2IContext___return_seq(fra.me.REG[1])(fra.me.REG[1]);
   REGB0 = TAG_Bool(fra.me.REG[2]!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 480);
+    nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 516);
   }
   CALL_icode___icode_builder___ICodeBuilder___add_escape(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:481 */
+  /* ./syntax//icode_generation.nit:517 */
   fra.me.REG[2] = NIT_NULL;
   goto label1;
   label1: while(0);
@@ -2769,10 +2997,11 @@ val_t syntax___icode_generation___ABreakExpr___generate_icode(val_t p0, val_t p1
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 486;
+  fra.me.line = 522;
   fra.me.meth = LOCATE_syntax___icode_generation___ABreakExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 5;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -2780,11 +3009,11 @@ val_t syntax___icode_generation___ABreakExpr___generate_icode(val_t p0, val_t p1
   fra.me.REG[4] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:486 */
+  /* ./syntax//icode_generation.nit:522 */
   fra.me.REG[2] = fra.me.REG[0];
-  /* ./syntax//icode_generation.nit:488 */
+  /* ./syntax//icode_generation.nit:524 */
   fra.me.REG[3] = CALL_parser___parser_nodes___ABreakExpr___n_expr(fra.me.REG[2])(fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:489 */
+  /* ./syntax//icode_generation.nit:525 */
   REGB0 = TAG_Bool(fra.me.REG[3]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
@@ -2799,35 +3028,35 @@ val_t syntax___icode_generation___ABreakExpr___generate_icode(val_t p0, val_t p1
   }
   REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
   if (UNTAG_Bool(REGB0)) {
-    /* ./syntax//icode_generation.nit:490 */
+    /* ./syntax//icode_generation.nit:526 */
     fra.me.REG[4] = CALL_syntax___scope___AEscapeExpr___escapable(fra.me.REG[2])(fra.me.REG[2]);
     REGB0 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
     if (UNTAG_Bool(REGB0)) {
-      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 490);
+      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 526);
     }
     fra.me.REG[4] = CALL_syntax___icode_generation___EscapableBlock___break_value(fra.me.REG[4])(fra.me.REG[4]);
     REGB0 = TAG_Bool(fra.me.REG[4]!=NIT_NULL);
     if (UNTAG_Bool(REGB0)) {
     } else {
-      nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 490);
+      nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 526);
     }
     fra.me.REG[3] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
     CALL_icode___icode_builder___ICodeBuilder___add_assignment(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4], fra.me.REG[3]);
   }
-  /* ./syntax//icode_generation.nit:492 */
+  /* ./syntax//icode_generation.nit:528 */
   fra.me.REG[2] = CALL_syntax___scope___AEscapeExpr___escapable(fra.me.REG[2])(fra.me.REG[2]);
   REGB0 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
-    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 492);
+    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 528);
   }
   fra.me.REG[2] = CALL_syntax___icode_generation___EscapableBlock___break_seq(fra.me.REG[2])(fra.me.REG[2]);
   REGB0 = TAG_Bool(fra.me.REG[2]!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 492);
+    nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 528);
   }
   CALL_icode___icode_builder___ICodeBuilder___add_escape(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:493 */
+  /* ./syntax//icode_generation.nit:529 */
   fra.me.REG[2] = NIT_NULL;
   goto label1;
   label1: while(0);
@@ -2841,10 +3070,11 @@ val_t syntax___icode_generation___AContinueExpr___generate_icode(val_t p0, val_t
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 498;
+  fra.me.line = 534;
   fra.me.meth = LOCATE_syntax___icode_generation___AContinueExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 5;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -2852,11 +3082,11 @@ val_t syntax___icode_generation___AContinueExpr___generate_icode(val_t p0, val_t
   fra.me.REG[4] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:498 */
+  /* ./syntax//icode_generation.nit:534 */
   fra.me.REG[2] = fra.me.REG[0];
-  /* ./syntax//icode_generation.nit:500 */
+  /* ./syntax//icode_generation.nit:536 */
   fra.me.REG[3] = CALL_parser___parser_nodes___AContinueExpr___n_expr(fra.me.REG[2])(fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:501 */
+  /* ./syntax//icode_generation.nit:537 */
   REGB0 = TAG_Bool(fra.me.REG[3]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
@@ -2871,35 +3101,35 @@ val_t syntax___icode_generation___AContinueExpr___generate_icode(val_t p0, val_t
   }
   REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
   if (UNTAG_Bool(REGB0)) {
-    /* ./syntax//icode_generation.nit:502 */
+    /* ./syntax//icode_generation.nit:538 */
     fra.me.REG[4] = CALL_syntax___scope___AEscapeExpr___escapable(fra.me.REG[2])(fra.me.REG[2]);
     REGB0 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
     if (UNTAG_Bool(REGB0)) {
-      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 502);
+      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 538);
     }
     fra.me.REG[4] = CALL_syntax___icode_generation___EscapableBlock___continue_value(fra.me.REG[4])(fra.me.REG[4]);
     REGB0 = TAG_Bool(fra.me.REG[4]!=NIT_NULL);
     if (UNTAG_Bool(REGB0)) {
     } else {
-      nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 502);
+      nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 538);
     }
     fra.me.REG[3] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
     CALL_icode___icode_builder___ICodeBuilder___add_assignment(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4], fra.me.REG[3]);
   }
-  /* ./syntax//icode_generation.nit:504 */
+  /* ./syntax//icode_generation.nit:540 */
   fra.me.REG[2] = CALL_syntax___scope___AEscapeExpr___escapable(fra.me.REG[2])(fra.me.REG[2]);
   REGB0 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
-    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 504);
+    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 540);
   }
   fra.me.REG[2] = CALL_syntax___icode_generation___EscapableBlock___continue_seq(fra.me.REG[2])(fra.me.REG[2]);
   REGB0 = TAG_Bool(fra.me.REG[2]!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 504);
+    nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 540);
   }
   CALL_icode___icode_builder___ICodeBuilder___add_escape(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:505 */
+  /* ./syntax//icode_generation.nit:541 */
   fra.me.REG[2] = NIT_NULL;
   goto label1;
   label1: while(0);
@@ -2913,16 +3143,17 @@ val_t syntax___icode_generation___AAbortExpr___generate_icode(val_t p0, val_t p1
   static val_t once_value_1; /* Once value */
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 510;
+  fra.me.line = 546;
   fra.me.meth = LOCATE_syntax___icode_generation___AAbortExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 3;
+  fra.me.nitni_local_ref_head = NULL;
   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;
-  /* ./syntax//icode_generation.nit:512 */
+  /* ./syntax//icode_generation.nit:548 */
   REGB0 = TAG_Int(0);
   fra.me.REG[0] = NEW_Array_standard___collection___array___Array___with_capacity(REGB0);
   if (!once_value_1) {
@@ -2935,7 +3166,7 @@ val_t syntax___icode_generation___AAbortExpr___generate_icode(val_t p0, val_t p1
   fra.me.REG[2] = fra.me.REG[2];
   CALL_standard___collection___abstract_collection___SimpleCollection___add(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[2]);
   CALL_icode___icode_builder___ICodeBuilder___add_abort(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:513 */
+  /* ./syntax//icode_generation.nit:549 */
   fra.me.REG[0] = NIT_NULL;
   goto label2;
   label2: while(0);
@@ -2949,10 +3180,11 @@ val_t syntax___icode_generation___AIfExpr___generate_icode(val_t p0, val_t p1){
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 518;
+  fra.me.line = 554;
   fra.me.meth = LOCATE_syntax___icode_generation___AIfExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 5;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -2960,15 +3192,15 @@ val_t syntax___icode_generation___AIfExpr___generate_icode(val_t p0, val_t p1){
   fra.me.REG[4] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:520 */
+  /* ./syntax//icode_generation.nit:556 */
   fra.me.REG[2] = CALL_parser___parser_nodes___AIfExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[2] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
   fra.me.REG[2] = NEW_IIf_icode___icode_base___IIf___init(fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:521 */
+  /* ./syntax//icode_generation.nit:557 */
   CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:522 */
+  /* ./syntax//icode_generation.nit:558 */
   fra.me.REG[3] = CALL_icode___icode_builder___ICodeBuilder___seq(fra.me.REG[1])(fra.me.REG[1]);
-  /* ./syntax//icode_generation.nit:524 */
+  /* ./syntax//icode_generation.nit:560 */
   fra.me.REG[4] = CALL_parser___parser_nodes___AIfExpr___n_then(fra.me.REG[0])(fra.me.REG[0]);
   REGB0 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
@@ -2984,14 +3216,14 @@ val_t syntax___icode_generation___AIfExpr___generate_icode(val_t p0, val_t p1){
   }
   REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
   if (UNTAG_Bool(REGB0)) {
-    /* ./syntax//icode_generation.nit:525 */
+    /* ./syntax//icode_generation.nit:561 */
     fra.me.REG[4] = CALL_icode___icode_base___IIf___then_seq(fra.me.REG[2])(fra.me.REG[2]);
     CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4]);
-    /* ./syntax//icode_generation.nit:526 */
+    /* ./syntax//icode_generation.nit:562 */
     fra.me.REG[4] = CALL_parser___parser_nodes___AIfExpr___n_then(fra.me.REG[0])(fra.me.REG[0]);
     CALL_syntax___icode_generation___A2IContext___generate_stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4]);
   }
-  /* ./syntax//icode_generation.nit:529 */
+  /* ./syntax//icode_generation.nit:565 */
   fra.me.REG[4] = CALL_parser___parser_nodes___AIfExpr___n_else(fra.me.REG[0])(fra.me.REG[0]);
   REGB0 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
@@ -3007,16 +3239,16 @@ val_t syntax___icode_generation___AIfExpr___generate_icode(val_t p0, val_t p1){
   }
   REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
   if (UNTAG_Bool(REGB0)) {
-    /* ./syntax//icode_generation.nit:530 */
+    /* ./syntax//icode_generation.nit:566 */
     fra.me.REG[2] = CALL_icode___icode_base___IIf___else_seq(fra.me.REG[2])(fra.me.REG[2]);
     CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-    /* ./syntax//icode_generation.nit:531 */
+    /* ./syntax//icode_generation.nit:567 */
     fra.me.REG[0] = CALL_parser___parser_nodes___AIfExpr___n_else(fra.me.REG[0])(fra.me.REG[0]);
     CALL_syntax___icode_generation___A2IContext___generate_stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
   }
-  /* ./syntax//icode_generation.nit:534 */
+  /* ./syntax//icode_generation.nit:570 */
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:535 */
+  /* ./syntax//icode_generation.nit:571 */
   fra.me.REG[3] = NIT_NULL;
   goto label1;
   label1: while(0);
@@ -3030,10 +3262,11 @@ val_t syntax___icode_generation___AWhileExpr___generate_icode(val_t p0, val_t p1
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 540;
+  fra.me.line = 576;
   fra.me.meth = LOCATE_syntax___icode_generation___AWhileExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 7;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -3043,28 +3276,28 @@ val_t syntax___icode_generation___AWhileExpr___generate_icode(val_t p0, val_t p1
   fra.me.REG[6] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:542 */
+  /* ./syntax//icode_generation.nit:578 */
   fra.me.REG[2] = CALL_icode___icode_builder___ICodeBuilder___seq(fra.me.REG[1])(fra.me.REG[1]);
-  /* ./syntax//icode_generation.nit:543 */
+  /* ./syntax//icode_generation.nit:579 */
   fra.me.REG[3] = NEW_ILoop_icode___icode_base___ILoop___init();
-  /* ./syntax//icode_generation.nit:544 */
+  /* ./syntax//icode_generation.nit:580 */
   CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:545 */
+  /* ./syntax//icode_generation.nit:581 */
   fra.me.REG[4] = CALL_syntax___typing___AAbsControl___escapable(fra.me.REG[0])(fra.me.REG[0]);
   REGB0 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
-    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 545);
+    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 581);
   }
   CALL_syntax___icode_generation___EscapableBlock___break_seq__eq(fra.me.REG[4])(fra.me.REG[4], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:546 */
+  /* ./syntax//icode_generation.nit:582 */
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:549 */
+  /* ./syntax//icode_generation.nit:585 */
   fra.me.REG[4] = CALL_parser___parser_nodes___AWhileExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[4] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4]);
   fra.me.REG[4] = NEW_IIf_icode___icode_base___IIf___init(fra.me.REG[4]);
-  /* ./syntax//icode_generation.nit:550 */
+  /* ./syntax//icode_generation.nit:586 */
   CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4]);
-  /* ./syntax//icode_generation.nit:553 */
+  /* ./syntax//icode_generation.nit:589 */
   fra.me.REG[5] = CALL_parser___parser_nodes___AWhileExpr___n_block(fra.me.REG[0])(fra.me.REG[0]);
   REGB0 = TAG_Bool(fra.me.REG[5]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
@@ -3080,29 +3313,29 @@ val_t syntax___icode_generation___AWhileExpr___generate_icode(val_t p0, val_t p1
   }
   REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
   if (UNTAG_Bool(REGB0)) {
-    /* ./syntax//icode_generation.nit:554 */
+    /* ./syntax//icode_generation.nit:590 */
     fra.me.REG[5] = CALL_icode___icode_base___IIf___then_seq(fra.me.REG[4])(fra.me.REG[4]);
     CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[5]);
-    /* ./syntax//icode_generation.nit:555 */
+    /* ./syntax//icode_generation.nit:591 */
     fra.me.REG[5] = CALL_syntax___typing___AAbsControl___escapable(fra.me.REG[0])(fra.me.REG[0]);
     fra.me.REG[6] = CALL_icode___icode_base___IIf___then_seq(fra.me.REG[4])(fra.me.REG[4]);
     REGB0 = TAG_Bool(fra.me.REG[5]==NIT_NULL);
     if (UNTAG_Bool(REGB0)) {
-      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 555);
+      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 591);
     }
     CALL_syntax___icode_generation___EscapableBlock___continue_seq__eq(fra.me.REG[5])(fra.me.REG[5], fra.me.REG[6]);
-    /* ./syntax//icode_generation.nit:556 */
+    /* ./syntax//icode_generation.nit:592 */
     fra.me.REG[0] = CALL_parser___parser_nodes___AWhileExpr___n_block(fra.me.REG[0])(fra.me.REG[0]);
     CALL_syntax___icode_generation___A2IContext___generate_stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
   }
-  /* ./syntax//icode_generation.nit:560 */
+  /* ./syntax//icode_generation.nit:596 */
   fra.me.REG[4] = CALL_icode___icode_base___IIf___else_seq(fra.me.REG[4])(fra.me.REG[4]);
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4]);
-  /* ./syntax//icode_generation.nit:561 */
+  /* ./syntax//icode_generation.nit:597 */
   CALL_icode___icode_builder___ICodeBuilder___add_escape(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:563 */
+  /* ./syntax//icode_generation.nit:599 */
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:564 */
+  /* ./syntax//icode_generation.nit:600 */
   fra.me.REG[2] = NIT_NULL;
   goto label1;
   label1: while(0);
@@ -3116,10 +3349,11 @@ val_t syntax___icode_generation___ALoopExpr___generate_icode(val_t p0, val_t p1)
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 569;
+  fra.me.line = 605;
   fra.me.meth = LOCATE_syntax___icode_generation___ALoopExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 5;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -3127,22 +3361,22 @@ val_t syntax___icode_generation___ALoopExpr___generate_icode(val_t p0, val_t p1)
   fra.me.REG[4] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:571 */
+  /* ./syntax//icode_generation.nit:607 */
   fra.me.REG[2] = CALL_icode___icode_builder___ICodeBuilder___seq(fra.me.REG[1])(fra.me.REG[1]);
-  /* ./syntax//icode_generation.nit:572 */
+  /* ./syntax//icode_generation.nit:608 */
   fra.me.REG[3] = NEW_ILoop_icode___icode_base___ILoop___init();
-  /* ./syntax//icode_generation.nit:573 */
+  /* ./syntax//icode_generation.nit:609 */
   CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:574 */
+  /* ./syntax//icode_generation.nit:610 */
   fra.me.REG[4] = CALL_syntax___typing___AAbsControl___escapable(fra.me.REG[0])(fra.me.REG[0]);
   REGB0 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
-    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 574);
+    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 610);
   }
   CALL_syntax___icode_generation___EscapableBlock___break_seq__eq(fra.me.REG[4])(fra.me.REG[4], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:575 */
+  /* ./syntax//icode_generation.nit:611 */
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:578 */
+  /* ./syntax//icode_generation.nit:614 */
   fra.me.REG[3] = CALL_parser___parser_nodes___ALoopExpr___n_block(fra.me.REG[0])(fra.me.REG[0]);
   REGB0 = TAG_Bool(fra.me.REG[3]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
@@ -3158,26 +3392,26 @@ val_t syntax___icode_generation___ALoopExpr___generate_icode(val_t p0, val_t p1)
   }
   REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
   if (UNTAG_Bool(REGB0)) {
-    /* ./syntax//icode_generation.nit:579 */
+    /* ./syntax//icode_generation.nit:615 */
     fra.me.REG[3] = NEW_ISeq_icode___icode_base___ISeq___init();
-    /* ./syntax//icode_generation.nit:580 */
+    /* ./syntax//icode_generation.nit:616 */
     CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-    /* ./syntax//icode_generation.nit:581 */
+    /* ./syntax//icode_generation.nit:617 */
     CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-    /* ./syntax//icode_generation.nit:582 */
+    /* ./syntax//icode_generation.nit:618 */
     fra.me.REG[4] = CALL_syntax___typing___AAbsControl___escapable(fra.me.REG[0])(fra.me.REG[0]);
     REGB0 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
     if (UNTAG_Bool(REGB0)) {
-      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 582);
+      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 618);
     }
     CALL_syntax___icode_generation___EscapableBlock___continue_seq__eq(fra.me.REG[4])(fra.me.REG[4], fra.me.REG[3]);
-    /* ./syntax//icode_generation.nit:583 */
+    /* ./syntax//icode_generation.nit:619 */
     fra.me.REG[0] = CALL_parser___parser_nodes___ALoopExpr___n_block(fra.me.REG[0])(fra.me.REG[0]);
     CALL_syntax___icode_generation___A2IContext___generate_stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
   }
-  /* ./syntax//icode_generation.nit:586 */
+  /* ./syntax//icode_generation.nit:622 */
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:587 */
+  /* ./syntax//icode_generation.nit:623 */
   fra.me.REG[2] = NIT_NULL;
   goto label1;
   label1: while(0);
@@ -3201,10 +3435,11 @@ val_t syntax___icode_generation___AForExpr___generate_icode(val_t p0, val_t p1){
       static val_t once_value_6; /* Once value */
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 592;
+  fra.me.line = 628;
   fra.me.meth = LOCATE_syntax___icode_generation___AForExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 9;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -3216,14 +3451,14 @@ val_t syntax___icode_generation___AForExpr___generate_icode(val_t p0, val_t p1){
   fra.me.REG[8] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:594 */
+  /* ./syntax//icode_generation.nit:630 */
   fra.me.REG[2] = CALL_parser___parser_nodes___AForExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:595 */
+  /* ./syntax//icode_generation.nit:631 */
   fra.me.REG[3] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[2])(fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:596 */
+  /* ./syntax//icode_generation.nit:632 */
   fra.me.REG[4] = CALL_syntax___icode_generation___A2IContext___visitor(fra.me.REG[1])(fra.me.REG[1]);
   fra.me.REG[4] = CALL_syntax___syntax_base___AbsSyntaxVisitor___type_int(fra.me.REG[4])(fra.me.REG[4]);
-  /* ./syntax//icode_generation.nit:600 */
+  /* ./syntax//icode_generation.nit:636 */
   REGB0 = TAG_Bool(VAL_ISA(fra.me.REG[2], COLOR_parser___parser_nodes___ARangeExpr, ID_parser___parser_nodes___ARangeExpr)) /*cast ARangeExpr*/;
   if (UNTAG_Bool(REGB0)) {
     fra.me.REG[5] = CALL_syntax___icode_generation___A2IContext___visitor(fra.me.REG[1])(fra.me.REG[1]);
@@ -3239,7 +3474,7 @@ val_t syntax___icode_generation___AForExpr___generate_icode(val_t p0, val_t p1){
     REGB0 = REGB1;
   }
   if (UNTAG_Bool(REGB0)) {
-    /* ./syntax//icode_generation.nit:605 */
+    /* ./syntax//icode_generation.nit:641 */
     REGB0 = TAG_Int(2);
     fra.me.REG[5] = NEW_Array_standard___collection___array___Array___with_capacity(REGB0);
     fra.me.REG[6] = CALL_parser___parser_nodes___ARangeExpr___n_expr(fra.me.REG[2])(fra.me.REG[2]);
@@ -3248,10 +3483,10 @@ val_t syntax___icode_generation___AForExpr___generate_icode(val_t p0, val_t p1){
     fra.me.REG[6] = CALL_parser___parser_nodes___ARangeExpr___n_expr2(fra.me.REG[2])(fra.me.REG[2]);
     fra.me.REG[6] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[6]);
     CALL_standard___collection___abstract_collection___SimpleCollection___add(fra.me.REG[5])(fra.me.REG[5], fra.me.REG[6]);
-    /* ./syntax//icode_generation.nit:606 */
+    /* ./syntax//icode_generation.nit:642 */
     REGB0 = TAG_Bool(VAL_ISA(fra.me.REG[2], COLOR_parser___parser_nodes___ACrangeExpr, ID_parser___parser_nodes___ACrangeExpr)) /*cast ACrangeExpr*/;
     if (UNTAG_Bool(REGB0)) {
-      /* ./syntax//icode_generation.nit:607 */
+      /* ./syntax//icode_generation.nit:643 */
       fra.me.REG[6] = CALL_syntax___icode_generation___A2IContext___visitor(fra.me.REG[1])(fra.me.REG[1]);
       if (!once_value_1) {
         if (!once_value_2) {
@@ -3269,13 +3504,13 @@ val_t syntax___icode_generation___AForExpr___generate_icode(val_t p0, val_t p1){
       fra.me.REG[7] = fra.me.REG[7];
       fra.me.REG[7] = CALL_syntax___syntax_base___AbsSyntaxVisitor___get_method(fra.me.REG[6])(fra.me.REG[6], fra.me.REG[4], fra.me.REG[7]);
     } else {
-      /* ./syntax//icode_generation.nit:609 */
+      /* ./syntax//icode_generation.nit:645 */
       REGB0 = TAG_Bool(VAL_ISA(fra.me.REG[2], COLOR_parser___parser_nodes___AOrangeExpr, ID_parser___parser_nodes___AOrangeExpr)) /*cast AOrangeExpr*/;
       if (UNTAG_Bool(REGB0)) {
       } else {
-        nit_abort("Assert failed", NULL, LOCATE_syntax___icode_generation, 609);
+        nit_abort("Assert failed", NULL, LOCATE_syntax___icode_generation, 645);
       }
-      /* ./syntax//icode_generation.nit:610 */
+      /* ./syntax//icode_generation.nit:646 */
       fra.me.REG[2] = CALL_syntax___icode_generation___A2IContext___visitor(fra.me.REG[1])(fra.me.REG[1]);
       if (!once_value_3) {
         if (!once_value_4) {
@@ -3295,7 +3530,7 @@ val_t syntax___icode_generation___AForExpr___generate_icode(val_t p0, val_t p1){
       fra.me.REG[7] = fra.me.REG[6];
     }
   } else {
-    /* ./syntax//icode_generation.nit:616 */
+    /* ./syntax//icode_generation.nit:652 */
     fra.me.REG[6] = CALL_syntax___icode_generation___A2IContext___visitor(fra.me.REG[1])(fra.me.REG[1]);
     if (!once_value_5) {
       if (!once_value_6) {
@@ -3313,7 +3548,7 @@ val_t syntax___icode_generation___AForExpr___generate_icode(val_t p0, val_t p1){
     fra.me.REG[4] = fra.me.REG[4];
     fra.me.REG[4] = CALL_syntax___syntax_base___AbsSyntaxVisitor___get_method(fra.me.REG[6])(fra.me.REG[6], fra.me.REG[3], fra.me.REG[4]);
     fra.me.REG[7] = fra.me.REG[4];
-    /* ./syntax//icode_generation.nit:617 */
+    /* ./syntax//icode_generation.nit:653 */
     REGB0 = TAG_Int(1);
     fra.me.REG[4] = NEW_Array_standard___collection___array___Array___with_capacity(REGB0);
     fra.me.REG[3] = CALL_parser___parser_nodes___AForExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
@@ -3321,106 +3556,106 @@ val_t syntax___icode_generation___AForExpr___generate_icode(val_t p0, val_t p1){
     CALL_standard___collection___abstract_collection___SimpleCollection___add(fra.me.REG[4])(fra.me.REG[4], fra.me.REG[3]);
     fra.me.REG[5] = fra.me.REG[4];
   }
-  /* ./syntax//icode_generation.nit:621 */
+  /* ./syntax//icode_generation.nit:657 */
   REGB0 = TAG_Bool(fra.me.REG[7]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
-    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 621);
+    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 657);
   }
   fra.me.REG[4] = CALL_metamodel___static_type___MMLocalProperty___signature(fra.me.REG[7])(fra.me.REG[7]);
   REGB0 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
-    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 621);
+    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 657);
   }
   fra.me.REG[4] = CALL_metamodel___static_type___MMSignature___closures(fra.me.REG[4])(fra.me.REG[4]);
   fra.me.REG[4] = CALL_standard___collection___abstract_collection___Collection___first(fra.me.REG[4])(fra.me.REG[4]);
   REGB0 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
-    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 621);
+    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 657);
   }
   fra.me.REG[4] = CALL_metamodel___static_type___MMClosure___signature(fra.me.REG[4])(fra.me.REG[4]);
   fra.me.REG[4] = CALL_icode___icode_builder___MMSignature___generate_empty_iclosuredef(fra.me.REG[4])(fra.me.REG[4], fra.me.REG[1]);
-  /* ./syntax//icode_generation.nit:622 */
+  /* ./syntax//icode_generation.nit:658 */
   fra.me.REG[3] = CALL_icode___icode_builder___ICodeBuilder___seq(fra.me.REG[1])(fra.me.REG[1]);
-  /* ./syntax//icode_generation.nit:624 */
+  /* ./syntax//icode_generation.nit:660 */
   fra.me.REG[6] = NEW_ISeq_icode___icode_base___ISeq___init();
-  /* ./syntax//icode_generation.nit:625 */
+  /* ./syntax//icode_generation.nit:661 */
   CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[6]);
-  /* ./syntax//icode_generation.nit:626 */
+  /* ./syntax//icode_generation.nit:662 */
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[6]);
-  /* ./syntax//icode_generation.nit:627 */
+  /* ./syntax//icode_generation.nit:663 */
   fra.me.REG[2] = CALL_syntax___typing___AAbsControl___escapable(fra.me.REG[0])(fra.me.REG[0]);
   REGB0 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
-    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 627);
+    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 663);
   }
   CALL_syntax___icode_generation___EscapableBlock___break_seq__eq(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[6]);
-  /* ./syntax//icode_generation.nit:628 */
+  /* ./syntax//icode_generation.nit:664 */
   fra.me.REG[2] = CALL_syntax___typing___AAbsControl___escapable(fra.me.REG[0])(fra.me.REG[0]);
   REGB0 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
-    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 628);
+    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 664);
   }
   CALL_syntax___icode_generation___EscapableBlock___break_value__eq(fra.me.REG[2])(fra.me.REG[2], NIT_NULL);
-  /* ./syntax//icode_generation.nit:630 */
+  /* ./syntax//icode_generation.nit:666 */
   fra.me.REG[2] = CALL_icode___icode_base___IRoutine___body(fra.me.REG[4])(fra.me.REG[4]);
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:631 */
+  /* ./syntax//icode_generation.nit:667 */
   fra.me.REG[2] = CALL_syntax___typing___AAbsControl___escapable(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[8] = CALL_icode___icode_base___IRoutine___body(fra.me.REG[4])(fra.me.REG[4]);
   REGB0 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
-    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 631);
+    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 667);
   }
   CALL_syntax___icode_generation___EscapableBlock___continue_seq__eq(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[8]);
-  /* ./syntax//icode_generation.nit:632 */
+  /* ./syntax//icode_generation.nit:668 */
   fra.me.REG[8] = CALL_syntax___typing___AAbsControl___escapable(fra.me.REG[0])(fra.me.REG[0]);
   REGB0 = TAG_Bool(fra.me.REG[8]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
-    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 632);
+    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 668);
   }
   CALL_syntax___icode_generation___EscapableBlock___continue_value__eq(fra.me.REG[8])(fra.me.REG[8], NIT_NULL);
-  /* ./syntax//icode_generation.nit:633 */
+  /* ./syntax//icode_generation.nit:669 */
   REGB0 = TAG_Int(0);
   fra.me.REG[8] = CALL_syntax___syntax_base___AForExpr___variables(fra.me.REG[0])(fra.me.REG[0]);
-  /* ./../lib/standard//collection//array.nit:23 */
+  /* ./../lib/standard//collection//array.nit:24 */
   REGB1 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[8])!=NIT_NULL);
   if (UNTAG_Bool(REGB1)) {
   } else {
-    nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 23);
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 24);
   }
   REGB1 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[8]);
-  /* ./../lib/standard//kernel.nit:335 */
+  /* ./../lib/standard//kernel.nit:352 */
   while(1) {
     REGB2 = TAG_Bool(VAL_ISA(REGB1, VTCOLOR_standard___kernel___Comparable___OTHER(REGB0), VTID_standard___kernel___Comparable___OTHER(REGB0))) /*cast OTHER*/;
     if (UNTAG_Bool(REGB2)) {
     } else {
       nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
     }
-    /* ./../lib/standard//kernel.nit:215 */
+    /* ./../lib/standard//kernel.nit:232 */
     REGB2 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB1));
-    /* ./../lib/standard//kernel.nit:335 */
+    /* ./../lib/standard//kernel.nit:352 */
     if (UNTAG_Bool(REGB2)) {
-      /* ./syntax//icode_generation.nit:633 */
+      /* ./syntax//icode_generation.nit:669 */
       REGB2 = REGB0;
-      /* ./syntax//icode_generation.nit:634 */
+      /* ./syntax//icode_generation.nit:670 */
       fra.me.REG[8] = CALL_syntax___syntax_base___AForExpr___variables(fra.me.REG[0])(fra.me.REG[0]);
-      /* ./../lib/standard//collection//array.nit:241 */
+      /* ./../lib/standard//collection//array.nit:278 */
       REGB3 = REGB2;
-      /* ./../lib/standard//collection//array.nit:243 */
+      /* ./../lib/standard//collection//array.nit:280 */
       REGB4 = TAG_Int(0);
       REGB5 = TAG_Bool(VAL_ISA(REGB4, VTCOLOR_standard___kernel___Comparable___OTHER(REGB3), VTID_standard___kernel___Comparable___OTHER(REGB3))) /*cast OTHER*/;
       if (UNTAG_Bool(REGB5)) {
       } else {
         nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
       }
-      /* ./../lib/standard//kernel.nit:216 */
+      /* ./../lib/standard//kernel.nit:233 */
       REGB4 = TAG_Bool(UNTAG_Int(REGB3)>=UNTAG_Int(REGB4));
-      /* ./../lib/standard//collection//array.nit:243 */
+      /* ./../lib/standard//collection//array.nit:280 */
       if (UNTAG_Bool(REGB4)) {
         REGB4 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[8])!=NIT_NULL);
         if (UNTAG_Bool(REGB4)) {
         } else {
-          nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 243);
+          nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 280);
         }
         REGB4 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[8]);
         REGB5 = TAG_Bool(VAL_ISA(REGB4, VTCOLOR_standard___kernel___Comparable___OTHER(REGB3), VTID_standard___kernel___Comparable___OTHER(REGB3))) /*cast OTHER*/;
@@ -3428,59 +3663,59 @@ val_t syntax___icode_generation___AForExpr___generate_icode(val_t p0, val_t p1){
         } else {
           nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
         }
-        /* ./../lib/standard//kernel.nit:215 */
+        /* ./../lib/standard//kernel.nit:232 */
         REGB4 = TAG_Bool(UNTAG_Int(REGB3)<UNTAG_Int(REGB4));
       } else {
-        /* ./../lib/standard//collection//array.nit:243 */
+        /* ./../lib/standard//collection//array.nit:280 */
         REGB5 = TAG_Bool(false);
         REGB4 = REGB5;
       }
       if (UNTAG_Bool(REGB4)) {
       } else {
-        nit_abort("Assert %s  failed", "'index'", LOCATE_standard___collection___array, 243);
+        nit_abort("Assert %s  failed", "'index'", LOCATE_standard___collection___array, 280);
       }
-      /* ./../lib/standard//collection//array.nit:244 */
+      /* ./../lib/standard//collection//array.nit:281 */
       fra.me.REG[8] = ATTR_standard___collection___array___Array____items(fra.me.REG[8]);
       REGB4 = TAG_Bool(fra.me.REG[8]==NIT_NULL);
       if (UNTAG_Bool(REGB4)) {
-        nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 244);
+        nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 281);
       }
-      /* ./../lib/standard//collection//array.nit:652 */
+      /* ./../lib/standard//collection//array.nit:718 */
       fra.me.REG[8] = ((Nit_NativeArray)fra.me.REG[8])->val[UNTAG_Int(REGB3)];
-      /* ./../lib/standard//collection//array.nit:244 */
+      /* ./../lib/standard//collection//array.nit:281 */
       goto label7;
       label7: while(0);
-      /* ./syntax//icode_generation.nit:634 */
+      /* ./syntax//icode_generation.nit:670 */
       fra.me.REG[8] = CALL_syntax___icode_generation___A2IContext___variable(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[8]);
       fra.me.REG[2] = CALL_icode___icode_base___IRoutine___params(fra.me.REG[4])(fra.me.REG[4]);
       fra.me.REG[2] = CALL_standard___collection___abstract_collection___SequenceRead_____bra(fra.me.REG[2])(fra.me.REG[2], REGB2);
       fra.me.REG[2] = NEW_IMove_icode___icode_base___IMove___init(fra.me.REG[8], fra.me.REG[2]);
       CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-      /* ./../lib/standard//kernel.nit:337 */
+      /* ./../lib/standard//kernel.nit:354 */
       REGB2 = TAG_Int(1);
-      /* ./../lib/standard//kernel.nit:218 */
+      /* ./../lib/standard//kernel.nit:235 */
       REGB2 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB2));
-      /* ./../lib/standard//kernel.nit:337 */
+      /* ./../lib/standard//kernel.nit:354 */
       REGB0 = REGB2;
     } else {
-      /* ./../lib/standard//kernel.nit:335 */
+      /* ./../lib/standard//kernel.nit:352 */
       goto label8;
     }
   }
   label8: while(0);
-  /* ./syntax//icode_generation.nit:636 */
+  /* ./syntax//icode_generation.nit:672 */
   fra.me.REG[0] = CALL_parser___parser_nodes___AForExpr___n_block(fra.me.REG[0])(fra.me.REG[0]);
   CALL_syntax___icode_generation___A2IContext___generate_stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:639 */
+  /* ./syntax//icode_generation.nit:675 */
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[6]);
-  /* ./syntax//icode_generation.nit:640 */
+  /* ./syntax//icode_generation.nit:676 */
   REGB0 = TAG_Int(1);
   fra.me.REG[6] = NEW_Array_standard___collection___array___Array___with_capacity(REGB0);
   CALL_standard___collection___abstract_collection___SimpleCollection___add(fra.me.REG[6])(fra.me.REG[6], fra.me.REG[4]);
   CALL_icode___icode_builder___ICodeBuilder___add_call(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[7], fra.me.REG[5], fra.me.REG[6]);
-  /* ./syntax//icode_generation.nit:642 */
+  /* ./syntax//icode_generation.nit:678 */
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:643 */
+  /* ./syntax//icode_generation.nit:679 */
   fra.me.REG[3] = NIT_NULL;
   goto label9;
   label9: while(0);
@@ -3496,10 +3731,11 @@ val_t syntax___icode_generation___AAssertExpr___generate_icode(val_t p0, val_t p
     static val_t once_value_2; /* Once value */
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 648;
+  fra.me.line = 684;
   fra.me.meth = LOCATE_syntax___icode_generation___AAssertExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 5;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -3507,24 +3743,24 @@ val_t syntax___icode_generation___AAssertExpr___generate_icode(val_t p0, val_t p
   fra.me.REG[4] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:650 */
+  /* ./syntax//icode_generation.nit:686 */
   fra.me.REG[2] = CALL_parser___parser_nodes___AAssertExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[2] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:651 */
+  /* ./syntax//icode_generation.nit:687 */
   fra.me.REG[2] = NEW_IIf_icode___icode_base___IIf___init(fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:652 */
+  /* ./syntax//icode_generation.nit:688 */
   CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:653 */
+  /* ./syntax//icode_generation.nit:689 */
   fra.me.REG[3] = CALL_icode___icode_builder___ICodeBuilder___seq(fra.me.REG[1])(fra.me.REG[1]);
-  /* ./syntax//icode_generation.nit:654 */
+  /* ./syntax//icode_generation.nit:690 */
   fra.me.REG[2] = CALL_icode___icode_base___IIf___else_seq(fra.me.REG[2])(fra.me.REG[2]);
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:655 */
+  /* ./syntax//icode_generation.nit:691 */
   fra.me.REG[2] = CALL_parser___parser_nodes___AAssertExpr___n_else(fra.me.REG[0])(fra.me.REG[0]);
   CALL_syntax___icode_generation___A2IContext___generate_stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:656 */
+  /* ./syntax//icode_generation.nit:692 */
   fra.me.REG[0] = CALL_parser___parser_nodes___AAssertExpr___n_id(fra.me.REG[0])(fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:657 */
+  /* ./syntax//icode_generation.nit:693 */
   REGB0 = TAG_Bool(fra.me.REG[0]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
@@ -3538,7 +3774,7 @@ val_t syntax___icode_generation___AAssertExpr___generate_icode(val_t p0, val_t p
     }
   }
   if (UNTAG_Bool(REGB0)) {
-    /* ./syntax//icode_generation.nit:658 */
+    /* ./syntax//icode_generation.nit:694 */
     REGB0 = TAG_Int(0);
     fra.me.REG[2] = NEW_Array_standard___collection___array___Array___with_capacity(REGB0);
     if (!once_value_1) {
@@ -3552,7 +3788,7 @@ val_t syntax___icode_generation___AAssertExpr___generate_icode(val_t p0, val_t p
     CALL_standard___collection___abstract_collection___SimpleCollection___add(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[4]);
     CALL_icode___icode_builder___ICodeBuilder___add_abort(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
   } else {
-    /* ./syntax//icode_generation.nit:660 */
+    /* ./syntax//icode_generation.nit:696 */
     REGB0 = TAG_Int(1);
     fra.me.REG[2] = NEW_Array_standard___collection___array___Array___with_capacity(REGB0);
     if (!once_value_2) {
@@ -3566,15 +3802,15 @@ val_t syntax___icode_generation___AAssertExpr___generate_icode(val_t p0, val_t p
     CALL_standard___collection___abstract_collection___SimpleCollection___add(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[4]);
     REGB0 = TAG_Bool(fra.me.REG[0]==NIT_NULL);
     if (UNTAG_Bool(REGB0)) {
-      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 660);
+      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 696);
     }
     fra.me.REG[0] = CALL_standard___string___Object___to_s(fra.me.REG[0])(fra.me.REG[0]);
     CALL_standard___collection___abstract_collection___SimpleCollection___add(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[0]);
     CALL_icode___icode_builder___ICodeBuilder___add_abort(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
   }
-  /* ./syntax//icode_generation.nit:662 */
+  /* ./syntax//icode_generation.nit:698 */
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:663 */
+  /* ./syntax//icode_generation.nit:699 */
   fra.me.REG[3] = NIT_NULL;
   goto label3;
   label3: while(0);
@@ -3586,15 +3822,16 @@ val_t syntax___icode_generation___AVarExpr___generate_icode(val_t p0, val_t p1){
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 668;
+  fra.me.line = 704;
   fra.me.meth = LOCATE_syntax___icode_generation___AVarExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:670 */
+  /* ./syntax//icode_generation.nit:706 */
   fra.me.REG[0] = CALL_syntax___syntax_base___AVarFormExpr___variable(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[0] = CALL_syntax___icode_generation___A2IContext___variable(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
   goto label1;
@@ -3607,23 +3844,24 @@ val_t syntax___icode_generation___AVarAssignExpr___generate_icode(val_t p0, val_
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 675;
+  fra.me.line = 711;
   fra.me.meth = LOCATE_syntax___icode_generation___AVarAssignExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 3;
+  fra.me.nitni_local_ref_head = NULL;
   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;
-  /* ./syntax//icode_generation.nit:677 */
+  /* ./syntax//icode_generation.nit:713 */
   fra.me.REG[2] = CALL_parser___parser_nodes___AAssignFormExpr___n_value(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[2] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:678 */
+  /* ./syntax//icode_generation.nit:714 */
   fra.me.REG[0] = CALL_syntax___syntax_base___AVarFormExpr___variable(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[0] = CALL_syntax___icode_generation___A2IContext___variable(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
   CALL_icode___icode_builder___ICodeBuilder___add_assignment(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:679 */
+  /* ./syntax//icode_generation.nit:715 */
   fra.me.REG[2] = NIT_NULL;
   goto label1;
   label1: while(0);
@@ -3636,10 +3874,11 @@ val_t syntax___icode_generation___AVarReassignExpr___generate_icode(val_t p0, va
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 684;
+  fra.me.line = 720;
   fra.me.meth = LOCATE_syntax___icode_generation___AVarReassignExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 7;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -3649,15 +3888,15 @@ val_t syntax___icode_generation___AVarReassignExpr___generate_icode(val_t p0, va
   fra.me.REG[6] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:684 */
+  /* ./syntax//icode_generation.nit:720 */
   fra.me.REG[2] = fra.me.REG[0];
-  /* ./syntax//icode_generation.nit:686 */
+  /* ./syntax//icode_generation.nit:722 */
   fra.me.REG[3] = CALL_syntax___syntax_base___AVarFormExpr___variable(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[3] = CALL_syntax___icode_generation___A2IContext___variable(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:687 */
+  /* ./syntax//icode_generation.nit:723 */
   fra.me.REG[4] = CALL_parser___parser_nodes___AReassignFormExpr___n_value(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[4] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4]);
-  /* ./syntax//icode_generation.nit:688 */
+  /* ./syntax//icode_generation.nit:724 */
   fra.me.REG[5] = CALL_syntax___syntax_base___AReassignFormExpr___assign_method(fra.me.REG[2])(fra.me.REG[2]);
   REGB0 = TAG_Int(2);
   fra.me.REG[6] = NEW_Array_standard___collection___array___Array___with_capacity(REGB0);
@@ -3668,18 +3907,18 @@ val_t syntax___icode_generation___AVarReassignExpr___generate_icode(val_t p0, va
   fra.me.REG[2] = CALL_metamodel___static_type___MMLocalProperty___signature(fra.me.REG[2])(fra.me.REG[2]);
   REGB0 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
-    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 688);
+    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 724);
   }
   fra.me.REG[2] = CALL_metamodel___static_type___MMSignature___return_type(fra.me.REG[2])(fra.me.REG[2]);
   REGB0 = TAG_Bool((fra.me.REG[2]!=NIT_NULL) && VAL_ISA(fra.me.REG[2], COLOR_metamodel___static_type___MMType, ID_metamodel___static_type___MMType)) /*cast MMType*/;
   if (UNTAG_Bool(REGB0)) {
   } else {
-    nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 688);
+    nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 724);
   }
   fra.me.REG[2] = CALL_icode___icode_builder___ICodeBuilder___expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[6], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:689 */
+  /* ./syntax//icode_generation.nit:725 */
   CALL_icode___icode_builder___ICodeBuilder___add_assignment(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:690 */
+  /* ./syntax//icode_generation.nit:726 */
   fra.me.REG[2] = NIT_NULL;
   goto label1;
   label1: while(0);
@@ -3691,15 +3930,16 @@ val_t syntax___icode_generation___ASelfExpr___generate_icode(val_t p0, val_t p1)
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 695;
+  fra.me.line = 731;
   fra.me.meth = LOCATE_syntax___icode_generation___ASelfExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:697 */
+  /* ./syntax//icode_generation.nit:733 */
   fra.me.REG[0] = CALL_syntax___syntax_base___ASelfExpr___variable(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[0] = CALL_syntax___icode_generation___A2IContext___variable(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
   goto label1;
@@ -3712,10 +3952,11 @@ val_t syntax___icode_generation___AIfexprExpr___generate_icode(val_t p0, val_t p
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 702;
+  fra.me.line = 738;
   fra.me.meth = LOCATE_syntax___icode_generation___AIfexprExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 6;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -3724,34 +3965,34 @@ val_t syntax___icode_generation___AIfexprExpr___generate_icode(val_t p0, val_t p
   fra.me.REG[5] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:705 */
+  /* ./syntax//icode_generation.nit:741 */
   fra.me.REG[2] = CALL_parser___parser_nodes___AIfexprExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[2] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
   fra.me.REG[2] = NEW_IIf_icode___icode_base___IIf___init(fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:706 */
+  /* ./syntax//icode_generation.nit:742 */
   CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:707 */
+  /* ./syntax//icode_generation.nit:743 */
   fra.me.REG[3] = CALL_icode___icode_builder___ICodeBuilder___seq(fra.me.REG[1])(fra.me.REG[1]);
-  /* ./syntax//icode_generation.nit:710 */
+  /* ./syntax//icode_generation.nit:746 */
   fra.me.REG[4] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[4] = CALL_icode___icode_builder___ICodeBuilder___new_register(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4]);
-  /* ./syntax//icode_generation.nit:713 */
+  /* ./syntax//icode_generation.nit:749 */
   fra.me.REG[5] = CALL_icode___icode_base___IIf___then_seq(fra.me.REG[2])(fra.me.REG[2]);
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[5]);
-  /* ./syntax//icode_generation.nit:714 */
+  /* ./syntax//icode_generation.nit:750 */
   fra.me.REG[5] = CALL_parser___parser_nodes___AIfexprExpr___n_then(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[5] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[5]);
   CALL_icode___icode_builder___ICodeBuilder___add_assignment(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4], fra.me.REG[5]);
-  /* ./syntax//icode_generation.nit:717 */
+  /* ./syntax//icode_generation.nit:753 */
   fra.me.REG[2] = CALL_icode___icode_base___IIf___else_seq(fra.me.REG[2])(fra.me.REG[2]);
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:718 */
+  /* ./syntax//icode_generation.nit:754 */
   fra.me.REG[0] = CALL_parser___parser_nodes___AIfexprExpr___n_else(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[0] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
   CALL_icode___icode_builder___ICodeBuilder___add_assignment(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4], fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:720 */
+  /* ./syntax//icode_generation.nit:756 */
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:721 */
+  /* ./syntax//icode_generation.nit:757 */
   goto label1;
   label1: while(0);
   stack_frame_head = fra.me.prev;
@@ -3762,23 +4003,24 @@ val_t syntax___icode_generation___AEeExpr___generate_icode(val_t p0, val_t p1){
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 726;
+  fra.me.line = 762;
   fra.me.meth = LOCATE_syntax___icode_generation___AEeExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 4;
+  fra.me.nitni_local_ref_head = NULL;
   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;
-  /* ./syntax//icode_generation.nit:728 */
+  /* ./syntax//icode_generation.nit:764 */
   fra.me.REG[2] = CALL_parser___parser_nodes___AEeExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[2] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:729 */
+  /* ./syntax//icode_generation.nit:765 */
   fra.me.REG[3] = CALL_parser___parser_nodes___AEeExpr___n_expr2(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[3] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:730 */
+  /* ./syntax//icode_generation.nit:766 */
   fra.me.REG[3] = NEW_IIs_icode___icode_base___IIs___init(fra.me.REG[2], fra.me.REG[3]);
   fra.me.REG[0] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[0] = CALL_icode___icode_builder___ICodeBuilder___expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3], fra.me.REG[0]);
@@ -3792,10 +4034,11 @@ val_t syntax___icode_generation___AOrExpr___generate_icode(val_t p0, val_t p1){
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 735;
+  fra.me.line = 771;
   fra.me.meth = LOCATE_syntax___icode_generation___AOrExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 6;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -3804,33 +4047,33 @@ val_t syntax___icode_generation___AOrExpr___generate_icode(val_t p0, val_t p1){
   fra.me.REG[5] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:738 */
+  /* ./syntax//icode_generation.nit:774 */
   fra.me.REG[2] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[2] = CALL_icode___icode_builder___ICodeBuilder___new_register(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:741 */
+  /* ./syntax//icode_generation.nit:777 */
   fra.me.REG[3] = CALL_parser___parser_nodes___AOrExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[3] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
   fra.me.REG[3] = NEW_IIf_icode___icode_base___IIf___init(fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:742 */
+  /* ./syntax//icode_generation.nit:778 */
   CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:743 */
+  /* ./syntax//icode_generation.nit:779 */
   fra.me.REG[4] = CALL_icode___icode_builder___ICodeBuilder___seq(fra.me.REG[1])(fra.me.REG[1]);
-  /* ./syntax//icode_generation.nit:744 */
+  /* ./syntax//icode_generation.nit:780 */
   fra.me.REG[5] = CALL_icode___icode_base___IIf___then_seq(fra.me.REG[3])(fra.me.REG[3]);
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[5]);
-  /* ./syntax//icode_generation.nit:745 */
+  /* ./syntax//icode_generation.nit:781 */
   fra.me.REG[5] = CALL_icode___icode_builder___ICodeBuilder___lit_true_reg(fra.me.REG[1])(fra.me.REG[1]);
   CALL_icode___icode_builder___ICodeBuilder___add_assignment(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2], fra.me.REG[5]);
-  /* ./syntax//icode_generation.nit:748 */
+  /* ./syntax//icode_generation.nit:784 */
   fra.me.REG[3] = CALL_icode___icode_base___IIf___else_seq(fra.me.REG[3])(fra.me.REG[3]);
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:749 */
+  /* ./syntax//icode_generation.nit:785 */
   fra.me.REG[0] = CALL_parser___parser_nodes___AOrExpr___n_expr2(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[0] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
   CALL_icode___icode_builder___ICodeBuilder___add_assignment(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2], fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:751 */
+  /* ./syntax//icode_generation.nit:787 */
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4]);
-  /* ./syntax//icode_generation.nit:752 */
+  /* ./syntax//icode_generation.nit:788 */
   goto label1;
   label1: while(0);
   stack_frame_head = fra.me.prev;
@@ -3841,10 +4084,11 @@ val_t syntax___icode_generation___AAndExpr___generate_icode(val_t p0, val_t p1){
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 757;
+  fra.me.line = 793;
   fra.me.meth = LOCATE_syntax___icode_generation___AAndExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 6;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -3853,33 +4097,33 @@ val_t syntax___icode_generation___AAndExpr___generate_icode(val_t p0, val_t p1){
   fra.me.REG[5] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:760 */
+  /* ./syntax//icode_generation.nit:796 */
   fra.me.REG[2] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[2] = CALL_icode___icode_builder___ICodeBuilder___new_register(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:763 */
+  /* ./syntax//icode_generation.nit:799 */
   fra.me.REG[3] = CALL_parser___parser_nodes___AAndExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[3] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
   fra.me.REG[3] = NEW_IIf_icode___icode_base___IIf___init(fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:764 */
+  /* ./syntax//icode_generation.nit:800 */
   CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:765 */
+  /* ./syntax//icode_generation.nit:801 */
   fra.me.REG[4] = CALL_icode___icode_builder___ICodeBuilder___seq(fra.me.REG[1])(fra.me.REG[1]);
-  /* ./syntax//icode_generation.nit:766 */
+  /* ./syntax//icode_generation.nit:802 */
   fra.me.REG[5] = CALL_icode___icode_base___IIf___else_seq(fra.me.REG[3])(fra.me.REG[3]);
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[5]);
-  /* ./syntax//icode_generation.nit:767 */
+  /* ./syntax//icode_generation.nit:803 */
   fra.me.REG[5] = CALL_icode___icode_builder___ICodeBuilder___lit_false_reg(fra.me.REG[1])(fra.me.REG[1]);
   CALL_icode___icode_builder___ICodeBuilder___add_assignment(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2], fra.me.REG[5]);
-  /* ./syntax//icode_generation.nit:770 */
+  /* ./syntax//icode_generation.nit:806 */
   fra.me.REG[3] = CALL_icode___icode_base___IIf___then_seq(fra.me.REG[3])(fra.me.REG[3]);
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:771 */
+  /* ./syntax//icode_generation.nit:807 */
   fra.me.REG[0] = CALL_parser___parser_nodes___AAndExpr___n_expr2(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[0] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
   CALL_icode___icode_builder___ICodeBuilder___add_assignment(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2], fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:773 */
+  /* ./syntax//icode_generation.nit:809 */
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4]);
-  /* ./syntax//icode_generation.nit:774 */
+  /* ./syntax//icode_generation.nit:810 */
   goto label1;
   label1: while(0);
   stack_frame_head = fra.me.prev;
@@ -3890,19 +4134,20 @@ val_t syntax___icode_generation___ANotExpr___generate_icode(val_t p0, val_t p1){
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 779;
+  fra.me.line = 815;
   fra.me.meth = LOCATE_syntax___icode_generation___ANotExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 3;
+  fra.me.nitni_local_ref_head = NULL;
   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;
-  /* ./syntax//icode_generation.nit:781 */
+  /* ./syntax//icode_generation.nit:817 */
   fra.me.REG[2] = CALL_parser___parser_nodes___ANotExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[2] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:782 */
+  /* ./syntax//icode_generation.nit:818 */
   fra.me.REG[2] = NEW_INot_icode___icode_base___INot___init(fra.me.REG[2]);
   fra.me.REG[0] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[0] = CALL_icode___icode_builder___ICodeBuilder___expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2], fra.me.REG[0]);
@@ -3916,10 +4161,11 @@ val_t syntax___icode_generation___AOrElseExpr___generate_icode(val_t p0, val_t p
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 787;
+  fra.me.line = 823;
   fra.me.meth = LOCATE_syntax___icode_generation___AOrElseExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 7;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -3929,40 +4175,40 @@ val_t syntax___icode_generation___AOrElseExpr___generate_icode(val_t p0, val_t p
   fra.me.REG[6] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:790 */
+  /* ./syntax//icode_generation.nit:826 */
   fra.me.REG[2] = CALL_parser___parser_nodes___AOrElseExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[2] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:793 */
+  /* ./syntax//icode_generation.nit:829 */
   fra.me.REG[3] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[3] = CALL_icode___icode_builder___ICodeBuilder___new_register(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:796 */
+  /* ./syntax//icode_generation.nit:832 */
   fra.me.REG[4] = CALL_icode___icode_builder___ICodeBuilder___lit_null_reg(fra.me.REG[1])(fra.me.REG[1]);
-  /* ./syntax//icode_generation.nit:797 */
+  /* ./syntax//icode_generation.nit:833 */
   fra.me.REG[4] = NEW_IIs_icode___icode_base___IIs___init(fra.me.REG[2], fra.me.REG[4]);
   fra.me.REG[5] = CALL_icode___icode_builder___ICodeBuilder___mmmodule(fra.me.REG[1])(fra.me.REG[1]);
   fra.me.REG[5] = CALL_metamodel___static_type___MMModule___type_bool(fra.me.REG[5])(fra.me.REG[5]);
   fra.me.REG[5] = CALL_icode___icode_builder___ICodeBuilder___expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4], fra.me.REG[5]);
-  /* ./syntax//icode_generation.nit:798 */
+  /* ./syntax//icode_generation.nit:834 */
   fra.me.REG[5] = NEW_IIf_icode___icode_base___IIf___init(fra.me.REG[5]);
-  /* ./syntax//icode_generation.nit:799 */
+  /* ./syntax//icode_generation.nit:835 */
   CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[5]);
-  /* ./syntax//icode_generation.nit:800 */
+  /* ./syntax//icode_generation.nit:836 */
   fra.me.REG[4] = CALL_icode___icode_builder___ICodeBuilder___seq(fra.me.REG[1])(fra.me.REG[1]);
-  /* ./syntax//icode_generation.nit:803 */
+  /* ./syntax//icode_generation.nit:839 */
   fra.me.REG[6] = CALL_icode___icode_base___IIf___then_seq(fra.me.REG[5])(fra.me.REG[5]);
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[6]);
-  /* ./syntax//icode_generation.nit:804 */
+  /* ./syntax//icode_generation.nit:840 */
   fra.me.REG[0] = CALL_parser___parser_nodes___AOrElseExpr___n_expr2(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[0] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
   CALL_icode___icode_builder___ICodeBuilder___add_assignment(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3], fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:807 */
+  /* ./syntax//icode_generation.nit:843 */
   fra.me.REG[5] = CALL_icode___icode_base___IIf___else_seq(fra.me.REG[5])(fra.me.REG[5]);
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[5]);
-  /* ./syntax//icode_generation.nit:808 */
+  /* ./syntax//icode_generation.nit:844 */
   CALL_icode___icode_builder___ICodeBuilder___add_assignment(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:810 */
+  /* ./syntax//icode_generation.nit:846 */
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4]);
-  /* ./syntax//icode_generation.nit:812 */
+  /* ./syntax//icode_generation.nit:848 */
   goto label1;
   label1: while(0);
   stack_frame_head = fra.me.prev;
@@ -3974,10 +4220,11 @@ val_t syntax___icode_generation___AIsaExpr___generate_icode(val_t p0, val_t p1){
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 817;
+  fra.me.line = 853;
   fra.me.meth = LOCATE_syntax___icode_generation___AIsaExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 5;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -3985,17 +4232,17 @@ val_t syntax___icode_generation___AIsaExpr___generate_icode(val_t p0, val_t p1){
   fra.me.REG[4] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:817 */
+  /* ./syntax//icode_generation.nit:853 */
   fra.me.REG[2] = fra.me.REG[0];
-  /* ./syntax//icode_generation.nit:819 */
+  /* ./syntax//icode_generation.nit:855 */
   fra.me.REG[3] = CALL_parser___parser_nodes___AIsaExpr___n_expr(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[3] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:820 */
+  /* ./syntax//icode_generation.nit:856 */
   fra.me.REG[4] = CALL_syntax___icode_generation___A2IContext___selfreg(fra.me.REG[1])(fra.me.REG[1]);
   REGB0 = TAG_Bool(fra.me.REG[4]!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 820);
+    nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 856);
   }
   fra.me.REG[0] = CALL_parser___parser_nodes___AIsaExpr___n_type(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[0] = CALL_syntax___syntax_base___AType___stype(fra.me.REG[0])(fra.me.REG[0]);
@@ -4012,22 +4259,23 @@ val_t syntax___icode_generation___AAsCastExpr___generate_icode(val_t p0, val_t p
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 825;
+  fra.me.line = 861;
   fra.me.meth = LOCATE_syntax___icode_generation___AAsCastExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 3;
+  fra.me.nitni_local_ref_head = NULL;
   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;
-  /* ./syntax//icode_generation.nit:827 */
+  /* ./syntax//icode_generation.nit:863 */
   fra.me.REG[2] = CALL_parser___parser_nodes___AAsCastExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[2] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:828 */
+  /* ./syntax//icode_generation.nit:864 */
   fra.me.REG[0] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[0])(fra.me.REG[0]);
   CALL_icode___icode_builder___ICodeBuilder___add_type_cast(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2], fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:829 */
+  /* ./syntax//icode_generation.nit:865 */
   goto label1;
   label1: while(0);
   stack_frame_head = fra.me.prev;
@@ -4038,22 +4286,23 @@ val_t syntax___icode_generation___AAsNotnullExpr___generate_icode(val_t p0, val_
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 834;
+  fra.me.line = 870;
   fra.me.meth = LOCATE_syntax___icode_generation___AAsNotnullExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 3;
+  fra.me.nitni_local_ref_head = NULL;
   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;
-  /* ./syntax//icode_generation.nit:836 */
+  /* ./syntax//icode_generation.nit:872 */
   fra.me.REG[2] = CALL_parser___parser_nodes___AAsNotnullExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[2] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:837 */
+  /* ./syntax//icode_generation.nit:873 */
   fra.me.REG[0] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[0])(fra.me.REG[0]);
   CALL_icode___icode_builder___ICodeBuilder___add_type_cast(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2], fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:838 */
+  /* ./syntax//icode_generation.nit:874 */
   goto label1;
   label1: while(0);
   stack_frame_head = fra.me.prev;
@@ -4064,15 +4313,16 @@ val_t syntax___icode_generation___ATrueExpr___generate_icode(val_t p0, val_t p1)
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 843;
+  fra.me.line = 879;
   fra.me.meth = LOCATE_syntax___icode_generation___ATrueExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:845 */
+  /* ./syntax//icode_generation.nit:881 */
   fra.me.REG[1] = CALL_icode___icode_builder___ICodeBuilder___lit_true_reg(fra.me.REG[1])(fra.me.REG[1]);
   goto label1;
   label1: while(0);
@@ -4084,15 +4334,16 @@ val_t syntax___icode_generation___AFalseExpr___generate_icode(val_t p0, val_t p1
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 850;
+  fra.me.line = 886;
   fra.me.meth = LOCATE_syntax___icode_generation___AFalseExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:852 */
+  /* ./syntax//icode_generation.nit:888 */
   fra.me.REG[1] = CALL_icode___icode_builder___ICodeBuilder___lit_false_reg(fra.me.REG[1])(fra.me.REG[1]);
   goto label1;
   label1: while(0);
@@ -4104,16 +4355,17 @@ val_t syntax___icode_generation___AIntExpr___generate_icode(val_t p0, val_t p1){
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 857;
+  fra.me.line = 893;
   fra.me.meth = LOCATE_syntax___icode_generation___AIntExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 3;
+  fra.me.nitni_local_ref_head = NULL;
   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;
-  /* ./syntax//icode_generation.nit:859 */
+  /* ./syntax//icode_generation.nit:895 */
   fra.me.REG[2] = CALL_parser___parser_nodes___AIntExpr___n_number(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[2] = CALL_parser___lexer___Token___text(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[2] = NEW_IIntValue_icode___icode_base___IIntValue___init(fra.me.REG[2]);
@@ -4129,16 +4381,17 @@ val_t syntax___icode_generation___AFloatExpr___generate_icode(val_t p0, val_t p1
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 864;
+  fra.me.line = 900;
   fra.me.meth = LOCATE_syntax___icode_generation___AFloatExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 3;
+  fra.me.nitni_local_ref_head = NULL;
   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;
-  /* ./syntax//icode_generation.nit:866 */
+  /* ./syntax//icode_generation.nit:902 */
   fra.me.REG[2] = CALL_parser___parser_nodes___AFloatExpr___n_float(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[2] = CALL_parser___lexer___Token___text(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[2] = NEW_IFloatValue_icode___icode_base___IFloatValue___init(fra.me.REG[2]);
@@ -4154,16 +4407,17 @@ val_t syntax___icode_generation___ACharExpr___generate_icode(val_t p0, val_t p1)
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 871;
+  fra.me.line = 907;
   fra.me.meth = LOCATE_syntax___icode_generation___ACharExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 3;
+  fra.me.nitni_local_ref_head = NULL;
   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;
-  /* ./syntax//icode_generation.nit:873 */
+  /* ./syntax//icode_generation.nit:909 */
   fra.me.REG[2] = CALL_parser___parser_nodes___ACharExpr___n_char(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[2] = CALL_parser___lexer___Token___text(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[2] = NEW_ICharValue_icode___icode_base___ICharValue___init(fra.me.REG[2]);
@@ -4182,10 +4436,11 @@ val_t syntax___icode_generation___AStringFormExpr___generate_icode(val_t p0, val
     static val_t once_value_2; /* Once value */
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 878;
+  fra.me.line = 914;
   fra.me.meth = LOCATE_syntax___icode_generation___AStringFormExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 9;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -4197,43 +4452,43 @@ val_t syntax___icode_generation___AStringFormExpr___generate_icode(val_t p0, val
   fra.me.REG[8] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:878 */
+  /* ./syntax//icode_generation.nit:914 */
   fra.me.REG[2] = fra.me.REG[0];
-  /* ./syntax//icode_generation.nit:880 */
+  /* ./syntax//icode_generation.nit:916 */
   CALL_syntax___icode_generation___AStringFormExpr___compute_string_infos(fra.me.REG[2])(fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:881 */
+  /* ./syntax//icode_generation.nit:917 */
   fra.me.REG[3] = CALL_icode___icode_builder___ICodeBuilder___seq(fra.me.REG[1])(fra.me.REG[1]);
-  /* ./syntax//icode_generation.nit:882 */
+  /* ./syntax//icode_generation.nit:918 */
   fra.me.REG[4] = NEW_IOnce_icode___icode_base___IOnce___init();
-  /* ./syntax//icode_generation.nit:883 */
+  /* ./syntax//icode_generation.nit:919 */
   fra.me.REG[5] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[5] = CALL_icode___icode_builder___ICodeBuilder___expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4], fra.me.REG[5]);
-  /* ./syntax//icode_generation.nit:884 */
+  /* ./syntax//icode_generation.nit:920 */
   fra.me.REG[4] = CALL_icode___icode_base___IOnce___body(fra.me.REG[4])(fra.me.REG[4]);
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4]);
-  /* ./syntax//icode_generation.nit:885 */
+  /* ./syntax//icode_generation.nit:921 */
   fra.me.REG[4] = ATTR_syntax___icode_generation___AStringFormExpr____cstring(fra.me.REG[2]);
   REGB0 = TAG_Bool(fra.me.REG[4]!=NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
-    nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 885);
+    nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 921);
   }
   fra.me.REG[4] = NEW_IStringValue_icode___icode_base___IStringValue___init(fra.me.REG[4]);
   fra.me.REG[0] = CALL_syntax___icode_generation___A2IContext___visitor(fra.me.REG[1])(fra.me.REG[1]);
   fra.me.REG[0] = CALL_syntax___syntax_base___AbsSyntaxVisitor___type_nativestring(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[0] = CALL_icode___icode_builder___ICodeBuilder___expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4], fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:886 */
+  /* ./syntax//icode_generation.nit:922 */
   fra.me.REG[4] = ATTR_syntax___icode_generation___AStringFormExpr____cstring_length(fra.me.REG[2]);
   REGB0 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
-    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 886);
+    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 922);
   }
   fra.me.REG[4] = CALL_standard___string___Object___to_s(fra.me.REG[4])(fra.me.REG[4]);
   fra.me.REG[4] = NEW_IIntValue_icode___icode_base___IIntValue___init(fra.me.REG[4]);
   fra.me.REG[6] = CALL_syntax___icode_generation___A2IContext___visitor(fra.me.REG[1])(fra.me.REG[1]);
   fra.me.REG[6] = CALL_syntax___syntax_base___AbsSyntaxVisitor___type_int(fra.me.REG[6])(fra.me.REG[6]);
   fra.me.REG[6] = CALL_icode___icode_builder___ICodeBuilder___expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4], fra.me.REG[6]);
-  /* ./syntax//icode_generation.nit:887 */
+  /* ./syntax//icode_generation.nit:923 */
   fra.me.REG[4] = CALL_syntax___icode_generation___A2IContext___visitor(fra.me.REG[1])(fra.me.REG[1]);
   fra.me.REG[7] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[2])(fra.me.REG[2]);
   if (!once_value_1) {
@@ -4251,7 +4506,7 @@ val_t syntax___icode_generation___AStringFormExpr___generate_icode(val_t p0, val
   } else fra.me.REG[8] = once_value_1;
   fra.me.REG[8] = fra.me.REG[8];
   fra.me.REG[8] = CALL_syntax___syntax_base___AbsSyntaxVisitor___get_method(fra.me.REG[4])(fra.me.REG[4], fra.me.REG[7], fra.me.REG[8]);
-  /* ./syntax//icode_generation.nit:888 */
+  /* ./syntax//icode_generation.nit:924 */
   fra.me.REG[7] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[2])(fra.me.REG[2]);
   REGB0 = TAG_Int(2);
   fra.me.REG[4] = NEW_Array_standard___collection___array___Array___with_capacity(REGB0);
@@ -4260,11 +4515,11 @@ val_t syntax___icode_generation___AStringFormExpr___generate_icode(val_t p0, val
   fra.me.REG[4] = NEW_INew_icode___icode_base___INew___init(fra.me.REG[7], fra.me.REG[8], fra.me.REG[4]);
   fra.me.REG[2] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[2] = CALL_icode___icode_builder___ICodeBuilder___expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:889 */
+  /* ./syntax//icode_generation.nit:925 */
   CALL_icode___icode_builder___ICodeBuilder___add_assignment(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[5], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:890 */
+  /* ./syntax//icode_generation.nit:926 */
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:891 */
+  /* ./syntax//icode_generation.nit:927 */
   goto label3;
   label3: while(0);
   stack_frame_head = fra.me.prev;
@@ -4275,12 +4530,13 @@ val_t syntax___icode_generation___AStringFormExpr___string_text(val_t p0){
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 894;
+  fra.me.line = 930;
   fra.me.meth = LOCATE_syntax___icode_generation___AStringFormExpr___string_text;
   fra.me.has_broke = 0;
   fra.me.REG_size = 0;
-  /* ./syntax//icode_generation.nit:894 */
-  nit_abort("Deferred method called", NULL, LOCATE_syntax___icode_generation, 894);
+  fra.me.nitni_local_ref_head = NULL;
+  /* ./syntax//icode_generation.nit:930 */
+  nit_abort("Deferred method called", NULL, LOCATE_syntax___icode_generation, 930);
   stack_frame_head = fra.me.prev;
   return NIT_NULL;
 }
@@ -4295,29 +4551,30 @@ void syntax___icode_generation___AStringFormExpr___compute_string_infos(val_t p0
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 903;
+  fra.me.line = 939;
   fra.me.meth = LOCATE_syntax___icode_generation___AStringFormExpr___compute_string_infos;
   fra.me.has_broke = 0;
   fra.me.REG_size = 3;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
   fra.me.REG[0] = p0;
-  /* ./syntax//icode_generation.nit:906 */
+  /* ./syntax//icode_generation.nit:942 */
   REGB0 = TAG_Int(0);
-  /* ./syntax//icode_generation.nit:907 */
+  /* ./syntax//icode_generation.nit:943 */
   fra.me.REG[1] = CALL_syntax___icode_generation___AStringFormExpr___string_text(fra.me.REG[0])(fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:908 */
+  /* ./syntax//icode_generation.nit:944 */
   fra.me.REG[2] = NEW_Buffer_standard___string___Buffer___init();
-  /* ./syntax//icode_generation.nit:909 */
+  /* ./syntax//icode_generation.nit:945 */
   REGB1 = TAG_Int(0);
-  /* ./syntax//icode_generation.nit:910 */
+  /* ./syntax//icode_generation.nit:946 */
   while(1) {
-    /* ./../lib/standard//collection//array.nit:23 */
+    /* ./../lib/standard//collection//array.nit:24 */
     REGB2 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[1])!=NIT_NULL);
     if (UNTAG_Bool(REGB2)) {
     } else {
-      nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 23);
+      nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 24);
     }
     REGB2 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[1]);
     REGB3 = TAG_Bool(VAL_ISA(REGB2, VTCOLOR_standard___kernel___Comparable___OTHER(REGB1), VTID_standard___kernel___Comparable___OTHER(REGB1))) /*cast OTHER*/;
@@ -4325,39 +4582,39 @@ void syntax___icode_generation___AStringFormExpr___compute_string_infos(val_t p0
     } else {
       nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
     }
-    /* ./../lib/standard//kernel.nit:215 */
+    /* ./../lib/standard//kernel.nit:232 */
     REGB2 = TAG_Bool(UNTAG_Int(REGB1)<UNTAG_Int(REGB2));
-    /* ./syntax//icode_generation.nit:910 */
+    /* ./syntax//icode_generation.nit:946 */
     if (UNTAG_Bool(REGB2)) {
-      /* ./syntax//icode_generation.nit:911 */
+      /* ./syntax//icode_generation.nit:947 */
       REGB2 = CALL_standard___collection___abstract_collection___SequenceRead_____bra(fra.me.REG[1])(fra.me.REG[1], REGB1);
-      /* ./syntax//icode_generation.nit:912 */
+      /* ./syntax//icode_generation.nit:948 */
       REGB3 = TAG_Char('\\');
       REGB4 = TAG_Bool(IS_EQUAL_OO(REGB2,REGB3));
       if (UNTAG_Bool(REGB4)) {
       } else {
-        /* ./../lib/standard//kernel.nit:350 */
+        /* ./../lib/standard//kernel.nit:378 */
         REGB3 = TAG_Bool((REGB2)==(REGB3));
-        /* ./syntax//icode_generation.nit:912 */
+        /* ./syntax//icode_generation.nit:948 */
         REGB4 = REGB3;
       }
       if (UNTAG_Bool(REGB4)) {
-        /* ./syntax//icode_generation.nit:913 */
+        /* ./syntax//icode_generation.nit:949 */
         REGB4 = TAG_Int(1);
-        /* ./../lib/standard//kernel.nit:218 */
+        /* ./../lib/standard//kernel.nit:235 */
         REGB4 = TAG_Int(UNTAG_Int(REGB1)+UNTAG_Int(REGB4));
-        /* ./syntax//icode_generation.nit:913 */
+        /* ./syntax//icode_generation.nit:949 */
         REGB1 = REGB4;
-        /* ./syntax//icode_generation.nit:914 */
+        /* ./syntax//icode_generation.nit:950 */
         REGB4 = CALL_standard___collection___abstract_collection___SequenceRead_____bra(fra.me.REG[1])(fra.me.REG[1], REGB1);
-        /* ./syntax//icode_generation.nit:915 */
+        /* ./syntax//icode_generation.nit:951 */
         REGB3 = TAG_Char('{');
         REGB5 = TAG_Bool(IS_EQUAL_OO(REGB4,REGB3));
         if (UNTAG_Bool(REGB5)) {
         } else {
-          /* ./../lib/standard//kernel.nit:350 */
+          /* ./../lib/standard//kernel.nit:378 */
           REGB3 = TAG_Bool((REGB4)==(REGB3));
-          /* ./syntax//icode_generation.nit:915 */
+          /* ./syntax//icode_generation.nit:951 */
           REGB5 = REGB3;
         }
         REGB5 = TAG_Bool(!UNTAG_Bool(REGB5));
@@ -4366,9 +4623,9 @@ void syntax___icode_generation___AStringFormExpr___compute_string_infos(val_t p0
           REGB3 = TAG_Bool(IS_EQUAL_OO(REGB4,REGB5));
           if (UNTAG_Bool(REGB3)) {
           } else {
-            /* ./../lib/standard//kernel.nit:350 */
+            /* ./../lib/standard//kernel.nit:378 */
             REGB5 = TAG_Bool((REGB4)==(REGB5));
-            /* ./syntax//icode_generation.nit:915 */
+            /* ./syntax//icode_generation.nit:951 */
             REGB3 = REGB5;
           }
           REGB3 = TAG_Bool(!UNTAG_Bool(REGB3));
@@ -4377,36 +4634,36 @@ void syntax___icode_generation___AStringFormExpr___compute_string_infos(val_t p0
           REGB3 = REGB5;
         }
         if (UNTAG_Bool(REGB3)) {
-          /* ./syntax//icode_generation.nit:916 */
+          /* ./syntax//icode_generation.nit:952 */
           CALL_standard___collection___abstract_collection___SimpleCollection___add(fra.me.REG[2])(fra.me.REG[2], REGB2);
         }
-        /* ./syntax//icode_generation.nit:918 */
+        /* ./syntax//icode_generation.nit:954 */
         REGB2 = REGB4;
       }
-      /* ./syntax//icode_generation.nit:920 */
+      /* ./syntax//icode_generation.nit:956 */
       REGB4 = TAG_Int(1);
-      /* ./../lib/standard//kernel.nit:218 */
+      /* ./../lib/standard//kernel.nit:235 */
       REGB4 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB4));
-      /* ./syntax//icode_generation.nit:920 */
+      /* ./syntax//icode_generation.nit:956 */
       REGB0 = REGB4;
-      /* ./syntax//icode_generation.nit:921 */
+      /* ./syntax//icode_generation.nit:957 */
       CALL_standard___collection___abstract_collection___SimpleCollection___add(fra.me.REG[2])(fra.me.REG[2], REGB2);
-      /* ./syntax//icode_generation.nit:922 */
+      /* ./syntax//icode_generation.nit:958 */
       REGB2 = TAG_Int(1);
-      /* ./../lib/standard//kernel.nit:218 */
+      /* ./../lib/standard//kernel.nit:235 */
       REGB2 = TAG_Int(UNTAG_Int(REGB1)+UNTAG_Int(REGB2));
-      /* ./syntax//icode_generation.nit:922 */
+      /* ./syntax//icode_generation.nit:958 */
       REGB1 = REGB2;
     } else {
-      /* ./syntax//icode_generation.nit:910 */
+      /* ./syntax//icode_generation.nit:946 */
       goto label1;
     }
   }
   label1: while(0);
-  /* ./syntax//icode_generation.nit:924 */
+  /* ./syntax//icode_generation.nit:960 */
   fra.me.REG[2] = CALL_standard___string___Object___to_s(fra.me.REG[2])(fra.me.REG[2]);
   ATTR_syntax___icode_generation___AStringFormExpr____cstring(fra.me.REG[0]) = fra.me.REG[2];
-  /* ./syntax//icode_generation.nit:925 */
+  /* ./syntax//icode_generation.nit:961 */
   ATTR_syntax___icode_generation___AStringFormExpr____cstring_length(fra.me.REG[0]) = REGB0;
   stack_frame_head = fra.me.prev;
   return;
@@ -4419,31 +4676,32 @@ val_t syntax___icode_generation___AStringExpr___string_text(val_t p0){
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 930;
+  fra.me.line = 966;
   fra.me.meth = LOCATE_syntax___icode_generation___AStringExpr___string_text;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
-  /* ./syntax//icode_generation.nit:930 */
+  /* ./syntax//icode_generation.nit:966 */
   fra.me.REG[1] = CALL_parser___parser_nodes___AStringExpr___n_string(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[1] = CALL_parser___lexer___Token___text(fra.me.REG[1])(fra.me.REG[1]);
   REGB0 = TAG_Int(1);
   fra.me.REG[0] = CALL_parser___parser_nodes___AStringExpr___n_string(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[0] = CALL_parser___lexer___Token___text(fra.me.REG[0])(fra.me.REG[0]);
-  /* ./../lib/standard//collection//array.nit:23 */
+  /* ./../lib/standard//collection//array.nit:24 */
   REGB1 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB1)) {
   } else {
-    nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 23);
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 24);
   }
   REGB1 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:930 */
+  /* ./syntax//icode_generation.nit:966 */
   REGB2 = TAG_Int(2);
-  /* ./../lib/standard//kernel.nit:220 */
+  /* ./../lib/standard//kernel.nit:237 */
   REGB2 = TAG_Int(UNTAG_Int(REGB1)-UNTAG_Int(REGB2));
-  /* ./syntax//icode_generation.nit:930 */
+  /* ./syntax//icode_generation.nit:966 */
   fra.me.REG[1] = CALL_standard___string___AbstractString___substring(fra.me.REG[1])(fra.me.REG[1], REGB0, REGB2);
   goto label1;
   label1: while(0);
@@ -4458,31 +4716,32 @@ val_t syntax___icode_generation___AStartStringExpr___string_text(val_t p0){
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 933;
+  fra.me.line = 969;
   fra.me.meth = LOCATE_syntax___icode_generation___AStartStringExpr___string_text;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
-  /* ./syntax//icode_generation.nit:933 */
+  /* ./syntax//icode_generation.nit:969 */
   fra.me.REG[1] = CALL_parser___parser_nodes___AStartStringExpr___n_string(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[1] = CALL_parser___lexer___Token___text(fra.me.REG[1])(fra.me.REG[1]);
   REGB0 = TAG_Int(1);
   fra.me.REG[0] = CALL_parser___parser_nodes___AStartStringExpr___n_string(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[0] = CALL_parser___lexer___Token___text(fra.me.REG[0])(fra.me.REG[0]);
-  /* ./../lib/standard//collection//array.nit:23 */
+  /* ./../lib/standard//collection//array.nit:24 */
   REGB1 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB1)) {
   } else {
-    nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 23);
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 24);
   }
   REGB1 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:933 */
+  /* ./syntax//icode_generation.nit:969 */
   REGB2 = TAG_Int(2);
-  /* ./../lib/standard//kernel.nit:220 */
+  /* ./../lib/standard//kernel.nit:237 */
   REGB2 = TAG_Int(UNTAG_Int(REGB1)-UNTAG_Int(REGB2));
-  /* ./syntax//icode_generation.nit:933 */
+  /* ./syntax//icode_generation.nit:969 */
   fra.me.REG[1] = CALL_standard___string___AbstractString___substring(fra.me.REG[1])(fra.me.REG[1], REGB0, REGB2);
   goto label1;
   label1: while(0);
@@ -4497,31 +4756,32 @@ val_t syntax___icode_generation___AMidStringExpr___string_text(val_t p0){
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 936;
+  fra.me.line = 972;
   fra.me.meth = LOCATE_syntax___icode_generation___AMidStringExpr___string_text;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
-  /* ./syntax//icode_generation.nit:936 */
+  /* ./syntax//icode_generation.nit:972 */
   fra.me.REG[1] = CALL_parser___parser_nodes___AMidStringExpr___n_string(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[1] = CALL_parser___lexer___Token___text(fra.me.REG[1])(fra.me.REG[1]);
   REGB0 = TAG_Int(1);
   fra.me.REG[0] = CALL_parser___parser_nodes___AMidStringExpr___n_string(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[0] = CALL_parser___lexer___Token___text(fra.me.REG[0])(fra.me.REG[0]);
-  /* ./../lib/standard//collection//array.nit:23 */
+  /* ./../lib/standard//collection//array.nit:24 */
   REGB1 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB1)) {
   } else {
-    nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 23);
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 24);
   }
   REGB1 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:936 */
+  /* ./syntax//icode_generation.nit:972 */
   REGB2 = TAG_Int(2);
-  /* ./../lib/standard//kernel.nit:220 */
+  /* ./../lib/standard//kernel.nit:237 */
   REGB2 = TAG_Int(UNTAG_Int(REGB1)-UNTAG_Int(REGB2));
-  /* ./syntax//icode_generation.nit:936 */
+  /* ./syntax//icode_generation.nit:972 */
   fra.me.REG[1] = CALL_standard___string___AbstractString___substring(fra.me.REG[1])(fra.me.REG[1], REGB0, REGB2);
   goto label1;
   label1: while(0);
@@ -4536,31 +4796,32 @@ val_t syntax___icode_generation___AEndStringExpr___string_text(val_t p0){
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 939;
+  fra.me.line = 975;
   fra.me.meth = LOCATE_syntax___icode_generation___AEndStringExpr___string_text;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
-  /* ./syntax//icode_generation.nit:939 */
+  /* ./syntax//icode_generation.nit:975 */
   fra.me.REG[1] = CALL_parser___parser_nodes___AEndStringExpr___n_string(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[1] = CALL_parser___lexer___Token___text(fra.me.REG[1])(fra.me.REG[1]);
   REGB0 = TAG_Int(1);
   fra.me.REG[0] = CALL_parser___parser_nodes___AEndStringExpr___n_string(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[0] = CALL_parser___lexer___Token___text(fra.me.REG[0])(fra.me.REG[0]);
-  /* ./../lib/standard//collection//array.nit:23 */
+  /* ./../lib/standard//collection//array.nit:24 */
   REGB1 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB1)) {
   } else {
-    nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 23);
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 24);
   }
   REGB1 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:939 */
+  /* ./syntax//icode_generation.nit:975 */
   REGB2 = TAG_Int(2);
-  /* ./../lib/standard//kernel.nit:220 */
+  /* ./../lib/standard//kernel.nit:237 */
   REGB2 = TAG_Int(UNTAG_Int(REGB1)-UNTAG_Int(REGB2));
-  /* ./syntax//icode_generation.nit:939 */
+  /* ./syntax//icode_generation.nit:975 */
   fra.me.REG[1] = CALL_standard___string___AbstractString___substring(fra.me.REG[1])(fra.me.REG[1], REGB0, REGB2);
   goto label1;
   label1: while(0);
@@ -4575,10 +4836,11 @@ val_t syntax___icode_generation___ASuperstringExpr___generate_icode(val_t p0, va
     static val_t once_value_2; /* Once value */
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 943;
+  fra.me.line = 979;
   fra.me.meth = LOCATE_syntax___icode_generation___ASuperstringExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 6;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -4587,12 +4849,12 @@ val_t syntax___icode_generation___ASuperstringExpr___generate_icode(val_t p0, va
   fra.me.REG[5] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:945 */
+  /* ./syntax//icode_generation.nit:981 */
   fra.me.REG[2] = CALL_syntax___syntax_base___ASuperstringExpr___atype(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[3] = CALL_parser___parser_nodes___ASuperstringExpr___n_exprs(fra.me.REG[0])(fra.me.REG[0]);
   REGB0 = CALL_standard___collection___abstract_collection___Collection___length(fra.me.REG[3])(fra.me.REG[3]);
   fra.me.REG[2] = CALL_syntax___icode_generation___A2IContext___add_new_array(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2], REGB0);
-  /* ./syntax//icode_generation.nit:946 */
+  /* ./syntax//icode_generation.nit:982 */
   fra.me.REG[3] = CALL_syntax___icode_generation___A2IContext___visitor(fra.me.REG[1])(fra.me.REG[1]);
   fra.me.REG[4] = CALL_syntax___icode_generation___A2IContext___visitor(fra.me.REG[1])(fra.me.REG[1]);
   fra.me.REG[4] = CALL_syntax___syntax_base___AbsSyntaxVisitor___type_object(fra.me.REG[4])(fra.me.REG[4]);
@@ -4611,10 +4873,10 @@ val_t syntax___icode_generation___ASuperstringExpr___generate_icode(val_t p0, va
   } else fra.me.REG[5] = once_value_1;
   fra.me.REG[5] = fra.me.REG[5];
   fra.me.REG[5] = CALL_syntax___syntax_base___AbsSyntaxVisitor___get_method(fra.me.REG[3])(fra.me.REG[3], fra.me.REG[4], fra.me.REG[5]);
-  /* ./syntax//icode_generation.nit:947 */
+  /* ./syntax//icode_generation.nit:983 */
   fra.me.REG[4] = CALL_parser___parser_nodes___ASuperstringExpr___n_exprs(fra.me.REG[0])(fra.me.REG[0]);
   CALL_standard___collection___abstract_collection___Collection___iterate(fra.me.REG[4])(fra.me.REG[4], (&(fra.me)), ((fun_t)OC_syntax___icode_generation___ASuperstringExpr___generate_icode_3));
-  /* ./syntax//icode_generation.nit:954 */
+  /* ./syntax//icode_generation.nit:990 */
   REGB0 = TAG_Int(1);
   fra.me.REG[4] = NEW_Array_standard___collection___array___Array___with_capacity(REGB0);
   CALL_standard___collection___abstract_collection___SimpleCollection___add(fra.me.REG[4])(fra.me.REG[4], fra.me.REG[2]);
@@ -4638,6 +4900,7 @@ val_t syntax___icode_generation___ASuperstringExpr___generate_icode(val_t p0, va
     fra.me.meth = LOCATE_syntax___icode_generation___ASuperstringExpr___generate_icode;
     fra.me.has_broke = 0;
     fra.me.REG_size = 3;
+    fra.me.nitni_local_ref_head = NULL;
     fra.me.REG[0] = NIT_NULL;
     fra.me.REG[1] = NIT_NULL;
     fra.me.REG[2] = NIT_NULL;
@@ -4645,9 +4908,9 @@ val_t syntax___icode_generation___ASuperstringExpr___generate_icode(val_t p0, va
     fra.me.closure_funs = CREG;
     fra.me.REG[0] = p0;
     CREG[0] = clos_fun0;
-    /* ./syntax//icode_generation.nit:948 */
+    /* ./syntax//icode_generation.nit:984 */
     fra.me.REG[1] = CALL_syntax___icode_generation___A2IContext___generate_expr(closctx->REG[1])(closctx->REG[1], fra.me.REG[0]);
-    /* ./syntax//icode_generation.nit:949 */
+    /* ./syntax//icode_generation.nit:985 */
     fra.me.REG[0] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[0])(fra.me.REG[0]);
     fra.me.REG[2] = CALL_syntax___syntax_base___AExpr___stype(closctx->REG[0])(closctx->REG[0]);
     REGB0 = TAG_Bool(IS_EQUAL_OO(fra.me.REG[0],fra.me.REG[2]));
@@ -4658,7 +4921,7 @@ val_t syntax___icode_generation___ASuperstringExpr___generate_icode(val_t p0, va
     }
     REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
     if (UNTAG_Bool(REGB0)) {
-      /* ./syntax//icode_generation.nit:950 */
+      /* ./syntax//icode_generation.nit:986 */
       REGB0 = TAG_Int(1);
       fra.me.REG[2] = NEW_Array_standard___collection___array___Array___with_capacity(REGB0);
       CALL_standard___collection___abstract_collection___SimpleCollection___add(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[1]);
@@ -4667,7 +4930,7 @@ val_t syntax___icode_generation___ASuperstringExpr___generate_icode(val_t p0, va
       fra.me.REG[0] = CALL_icode___icode_builder___ICodeBuilder___expr(closctx->REG[1])(closctx->REG[1], fra.me.REG[2], fra.me.REG[0]);
       fra.me.REG[1] = fra.me.REG[0];
     }
-    /* ./syntax//icode_generation.nit:952 */
+    /* ./syntax//icode_generation.nit:988 */
     CALL_syntax___icode_generation___A2IContext___add_call_array_add(closctx->REG[1])(closctx->REG[1], closctx->REG[2], fra.me.REG[1]);
     stack_frame_head = fra.me.prev;
     return;
@@ -4677,15 +4940,16 @@ val_t syntax___icode_generation___ANullExpr___generate_icode(val_t p0, val_t p1)
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 959;
+  fra.me.line = 995;
   fra.me.meth = LOCATE_syntax___icode_generation___ANullExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:961 */
+  /* ./syntax//icode_generation.nit:997 */
   fra.me.REG[1] = CALL_icode___icode_builder___ICodeBuilder___lit_null_reg(fra.me.REG[1])(fra.me.REG[1]);
   goto label1;
   label1: while(0);
@@ -4698,25 +4962,26 @@ val_t syntax___icode_generation___AArrayExpr___generate_icode(val_t p0, val_t p1
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 966;
+  fra.me.line = 1002;
   fra.me.meth = LOCATE_syntax___icode_generation___AArrayExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 4;
+  fra.me.nitni_local_ref_head = NULL;
   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;
-  /* ./syntax//icode_generation.nit:968 */
+  /* ./syntax//icode_generation.nit:1004 */
   fra.me.REG[2] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[3] = CALL_parser___parser_nodes___AArrayExpr___n_exprs(fra.me.REG[0])(fra.me.REG[0]);
   REGB0 = CALL_standard___collection___abstract_collection___Collection___length(fra.me.REG[3])(fra.me.REG[3]);
   fra.me.REG[2] = CALL_syntax___icode_generation___A2IContext___add_new_array(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2], REGB0);
-  /* ./syntax//icode_generation.nit:969 */
+  /* ./syntax//icode_generation.nit:1005 */
   fra.me.REG[0] = CALL_parser___parser_nodes___AArrayExpr___n_exprs(fra.me.REG[0])(fra.me.REG[0]);
   CALL_standard___collection___abstract_collection___Collection___iterate(fra.me.REG[0])(fra.me.REG[0], (&(fra.me)), ((fun_t)OC_syntax___icode_generation___AArrayExpr___generate_icode_1));
-  /* ./syntax//icode_generation.nit:973 */
+  /* ./syntax//icode_generation.nit:1009 */
   goto label2;
   label2: while(0);
   stack_frame_head = fra.me.prev;
@@ -4732,14 +4997,15 @@ val_t syntax___icode_generation___AArrayExpr___generate_icode(val_t p0, val_t p1
     fra.me.meth = LOCATE_syntax___icode_generation___AArrayExpr___generate_icode;
     fra.me.has_broke = 0;
     fra.me.REG_size = 1;
+    fra.me.nitni_local_ref_head = NULL;
     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;
-    /* ./syntax//icode_generation.nit:970 */
+    /* ./syntax//icode_generation.nit:1006 */
     fra.me.REG[0] = CALL_syntax___icode_generation___A2IContext___generate_expr(closctx->REG[1])(closctx->REG[1], fra.me.REG[0]);
-    /* ./syntax//icode_generation.nit:971 */
+    /* ./syntax//icode_generation.nit:1007 */
     CALL_syntax___icode_generation___A2IContext___add_call_array_add(closctx->REG[1])(closctx->REG[1], closctx->REG[2], fra.me.REG[0]);
     stack_frame_head = fra.me.prev;
     return;
@@ -4752,10 +5018,11 @@ val_t syntax___icode_generation___ACrangeExpr___generate_icode(val_t p0, val_t p
     static val_t once_value_2; /* Once value */
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 978;
+  fra.me.line = 1014;
   fra.me.meth = LOCATE_syntax___icode_generation___ACrangeExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 7;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -4765,13 +5032,13 @@ val_t syntax___icode_generation___ACrangeExpr___generate_icode(val_t p0, val_t p
   fra.me.REG[6] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:980 */
+  /* ./syntax//icode_generation.nit:1016 */
   fra.me.REG[2] = CALL_parser___parser_nodes___ARangeExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[2] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:981 */
+  /* ./syntax//icode_generation.nit:1017 */
   fra.me.REG[3] = CALL_parser___parser_nodes___ARangeExpr___n_expr2(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[3] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:982 */
+  /* ./syntax//icode_generation.nit:1018 */
   fra.me.REG[4] = CALL_syntax___icode_generation___A2IContext___visitor(fra.me.REG[1])(fra.me.REG[1]);
   fra.me.REG[5] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[0])(fra.me.REG[0]);
   if (!once_value_1) {
@@ -4789,7 +5056,7 @@ val_t syntax___icode_generation___ACrangeExpr___generate_icode(val_t p0, val_t p
   } else fra.me.REG[6] = once_value_1;
   fra.me.REG[6] = fra.me.REG[6];
   fra.me.REG[6] = CALL_syntax___syntax_base___AbsSyntaxVisitor___get_method(fra.me.REG[4])(fra.me.REG[4], fra.me.REG[5], fra.me.REG[6]);
-  /* ./syntax//icode_generation.nit:983 */
+  /* ./syntax//icode_generation.nit:1019 */
   fra.me.REG[5] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[0])(fra.me.REG[0]);
   REGB0 = TAG_Int(2);
   fra.me.REG[4] = NEW_Array_standard___collection___array___Array___with_capacity(REGB0);
@@ -4811,10 +5078,11 @@ val_t syntax___icode_generation___AOrangeExpr___generate_icode(val_t p0, val_t p
     static val_t once_value_2; /* Once value */
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 988;
+  fra.me.line = 1024;
   fra.me.meth = LOCATE_syntax___icode_generation___AOrangeExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 7;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -4824,13 +5092,13 @@ val_t syntax___icode_generation___AOrangeExpr___generate_icode(val_t p0, val_t p
   fra.me.REG[6] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:990 */
+  /* ./syntax//icode_generation.nit:1026 */
   fra.me.REG[2] = CALL_parser___parser_nodes___ARangeExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[2] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:991 */
+  /* ./syntax//icode_generation.nit:1027 */
   fra.me.REG[3] = CALL_parser___parser_nodes___ARangeExpr___n_expr2(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[3] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:992 */
+  /* ./syntax//icode_generation.nit:1028 */
   fra.me.REG[4] = CALL_syntax___icode_generation___A2IContext___visitor(fra.me.REG[1])(fra.me.REG[1]);
   fra.me.REG[5] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[0])(fra.me.REG[0]);
   if (!once_value_1) {
@@ -4848,7 +5116,7 @@ val_t syntax___icode_generation___AOrangeExpr___generate_icode(val_t p0, val_t p
   } else fra.me.REG[6] = once_value_1;
   fra.me.REG[6] = fra.me.REG[6];
   fra.me.REG[6] = CALL_syntax___syntax_base___AbsSyntaxVisitor___get_method(fra.me.REG[4])(fra.me.REG[4], fra.me.REG[5], fra.me.REG[6]);
-  /* ./syntax//icode_generation.nit:993 */
+  /* ./syntax//icode_generation.nit:1029 */
   fra.me.REG[5] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[0])(fra.me.REG[0]);
   REGB0 = TAG_Int(2);
   fra.me.REG[4] = NEW_Array_standard___collection___array___Array___with_capacity(REGB0);
@@ -4871,10 +5139,11 @@ val_t syntax___icode_generation___ASuperExpr___generate_icode(val_t p0, val_t p1
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 998;
+  fra.me.line = 1034;
   fra.me.meth = LOCATE_syntax___icode_generation___ASuperExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 6;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -4883,14 +5152,14 @@ val_t syntax___icode_generation___ASuperExpr___generate_icode(val_t p0, val_t p1
   fra.me.REG[5] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:1000 */
+  /* ./syntax//icode_generation.nit:1036 */
   fra.me.REG[2] = CALL_icode___icode_builder___ICodeBuilder___iroutine(fra.me.REG[1])(fra.me.REG[1]);
   fra.me.REG[2] = CALL_icode___icode_base___IRoutine___params(fra.me.REG[2])(fra.me.REG[2]);
   REGB0 = CALL_standard___collection___abstract_collection___Collection___length(fra.me.REG[2])(fra.me.REG[2]);
   REGB1 = TAG_Int(1);
-  /* ./../lib/standard//kernel.nit:220 */
+  /* ./../lib/standard//kernel.nit:237 */
   REGB1 = TAG_Int(UNTAG_Int(REGB0)-UNTAG_Int(REGB1));
-  /* ./syntax//icode_generation.nit:1001 */
+  /* ./syntax//icode_generation.nit:1037 */
   fra.me.REG[2] = CALL_syntax___syntax_base___ASuperExpr___init_in_superclass(fra.me.REG[0])(fra.me.REG[0]);
   REGB0 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
@@ -4906,89 +5175,89 @@ val_t syntax___icode_generation___ASuperExpr___generate_icode(val_t p0, val_t p1
   }
   REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
   if (UNTAG_Bool(REGB0)) {
-    /* ./syntax//icode_generation.nit:1002 */
+    /* ./syntax//icode_generation.nit:1038 */
     fra.me.REG[2] = CALL_syntax___syntax_base___ASuperExpr___init_in_superclass(fra.me.REG[0])(fra.me.REG[0]);
     REGB0 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
     if (UNTAG_Bool(REGB0)) {
-      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1002);
+      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1038);
     }
     fra.me.REG[2] = CALL_metamodel___static_type___MMLocalProperty___signature(fra.me.REG[2])(fra.me.REG[2]);
     REGB0 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
     if (UNTAG_Bool(REGB0)) {
-      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1002);
+      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1038);
     }
     REGB0 = CALL_metamodel___static_type___MMSignature___arity(fra.me.REG[2])(fra.me.REG[2]);
     REGB1 = REGB0;
   }
-  /* ./syntax//icode_generation.nit:1004 */
+  /* ./syntax//icode_generation.nit:1040 */
   REGB0 = TAG_Int(1);
-  /* ./../lib/standard//kernel.nit:218 */
+  /* ./../lib/standard//kernel.nit:235 */
   REGB0 = TAG_Int(UNTAG_Int(REGB1)+UNTAG_Int(REGB0));
-  /* ./syntax//icode_generation.nit:1004 */
+  /* ./syntax//icode_generation.nit:1040 */
   fra.me.REG[2] = NEW_Array_standard___collection___array___Array___with_capacity(REGB0);
-  /* ./syntax//icode_generation.nit:1005 */
+  /* ./syntax//icode_generation.nit:1041 */
   fra.me.REG[3] = CALL_icode___icode_builder___ICodeBuilder___iroutine(fra.me.REG[1])(fra.me.REG[1]);
   fra.me.REG[3] = CALL_icode___icode_base___IRoutine___params(fra.me.REG[3])(fra.me.REG[3]);
   REGB0 = TAG_Int(0);
   fra.me.REG[3] = CALL_standard___collection___abstract_collection___SequenceRead_____bra(fra.me.REG[3])(fra.me.REG[3], REGB0);
   CALL_standard___collection___abstract_collection___SimpleCollection___add(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:1006 */
+  /* ./syntax//icode_generation.nit:1042 */
   fra.me.REG[3] = CALL_parser___parser_nodes___ASuperExpr___n_args(fra.me.REG[0])(fra.me.REG[0]);
   REGB0 = CALL_standard___collection___abstract_collection___Collection___length(fra.me.REG[3])(fra.me.REG[3]);
   REGB2 = TAG_Bool(IS_EQUAL_OO(REGB0,REGB1));
   if (UNTAG_Bool(REGB2)) {
   } else {
-    /* ./../lib/standard//kernel.nit:210 */
+    /* ./../lib/standard//kernel.nit:227 */
     REGB0 = TAG_Bool((REGB0)==(REGB1));
-    /* ./syntax//icode_generation.nit:1006 */
+    /* ./syntax//icode_generation.nit:1042 */
     REGB2 = REGB0;
   }
   REGB2 = TAG_Bool(!UNTAG_Bool(REGB2));
   if (UNTAG_Bool(REGB2)) {
-    /* ./syntax//icode_generation.nit:1007 */
+    /* ./syntax//icode_generation.nit:1043 */
     REGB2 = TAG_Int(0);
-    /* ./../lib/standard//kernel.nit:335 */
+    /* ./../lib/standard//kernel.nit:352 */
     while(1) {
       REGB0 = TAG_Bool(VAL_ISA(REGB1, VTCOLOR_standard___kernel___Comparable___OTHER(REGB2), VTID_standard___kernel___Comparable___OTHER(REGB2))) /*cast OTHER*/;
       if (UNTAG_Bool(REGB0)) {
       } else {
         nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
       }
-      /* ./../lib/standard//kernel.nit:215 */
+      /* ./../lib/standard//kernel.nit:232 */
       REGB0 = TAG_Bool(UNTAG_Int(REGB2)<UNTAG_Int(REGB1));
-      /* ./../lib/standard//kernel.nit:335 */
+      /* ./../lib/standard//kernel.nit:352 */
       if (UNTAG_Bool(REGB0)) {
-        /* ./syntax//icode_generation.nit:1007 */
+        /* ./syntax//icode_generation.nit:1043 */
         REGB0 = REGB2;
-        /* ./syntax//icode_generation.nit:1008 */
+        /* ./syntax//icode_generation.nit:1044 */
         fra.me.REG[3] = CALL_icode___icode_builder___ICodeBuilder___iroutine(fra.me.REG[1])(fra.me.REG[1]);
         fra.me.REG[3] = CALL_icode___icode_base___IRoutine___params(fra.me.REG[3])(fra.me.REG[3]);
         REGB3 = TAG_Int(1);
-        /* ./../lib/standard//kernel.nit:218 */
+        /* ./../lib/standard//kernel.nit:235 */
         REGB3 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB3));
-        /* ./syntax//icode_generation.nit:1008 */
+        /* ./syntax//icode_generation.nit:1044 */
         fra.me.REG[3] = CALL_standard___collection___abstract_collection___SequenceRead_____bra(fra.me.REG[3])(fra.me.REG[3], REGB3);
         CALL_standard___collection___abstract_collection___SimpleCollection___add(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[3]);
-        /* ./../lib/standard//kernel.nit:337 */
+        /* ./../lib/standard//kernel.nit:354 */
         REGB3 = TAG_Int(1);
-        /* ./../lib/standard//kernel.nit:218 */
+        /* ./../lib/standard//kernel.nit:235 */
         REGB3 = TAG_Int(UNTAG_Int(REGB2)+UNTAG_Int(REGB3));
-        /* ./../lib/standard//kernel.nit:337 */
+        /* ./../lib/standard//kernel.nit:354 */
         REGB2 = REGB3;
       } else {
-        /* ./../lib/standard//kernel.nit:335 */
+        /* ./../lib/standard//kernel.nit:352 */
         goto label1;
       }
     }
     label1: while(0);
   } else {
-    /* ./syntax//icode_generation.nit:1011 */
+    /* ./syntax//icode_generation.nit:1047 */
     fra.me.REG[3] = CALL_parser___parser_nodes___ASuperExpr___n_args(fra.me.REG[0])(fra.me.REG[0]);
     CALL_standard___collection___abstract_collection___Collection___iterate(fra.me.REG[3])(fra.me.REG[3], (&(fra.me)), ((fun_t)OC_syntax___icode_generation___ASuperExpr___generate_icode_2));
   }
-  /* ./syntax//icode_generation.nit:1015 */
+  /* ./syntax//icode_generation.nit:1051 */
   fra.me.REG[3] = CALL_syntax___syntax_base___ASuperExpr___init_in_superclass(fra.me.REG[0])(fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:1016 */
+  /* ./syntax//icode_generation.nit:1052 */
   REGB2 = TAG_Bool(fra.me.REG[3]==NIT_NULL);
   if (UNTAG_Bool(REGB2)) {
   } else {
@@ -5003,18 +5272,18 @@ val_t syntax___icode_generation___ASuperExpr___generate_icode(val_t p0, val_t p1
   }
   REGB2 = TAG_Bool(!UNTAG_Bool(REGB2));
   if (UNTAG_Bool(REGB2)) {
-    /* ./syntax//icode_generation.nit:1017 */
+    /* ./syntax//icode_generation.nit:1053 */
     REGB2 = TAG_Bool(fra.me.REG[3]==NIT_NULL);
     if (UNTAG_Bool(REGB2)) {
-      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1017);
+      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1053);
     }
     fra.me.REG[4] = CALL_metamodel___static_type___MMLocalProperty___signature(fra.me.REG[3])(fra.me.REG[3]);
     REGB2 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
     if (UNTAG_Bool(REGB2)) {
-      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1017);
+      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1053);
     }
     fra.me.REG[4] = CALL_metamodel___static_type___MMSignature___return_type(fra.me.REG[4])(fra.me.REG[4]);
-    /* ./syntax//icode_generation.nit:1018 */
+    /* ./syntax//icode_generation.nit:1054 */
     REGB2 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
     if (UNTAG_Bool(REGB2)) {
     } else {
@@ -5029,34 +5298,34 @@ val_t syntax___icode_generation___ASuperExpr___generate_icode(val_t p0, val_t p1
     }
     REGB2 = TAG_Bool(!UNTAG_Bool(REGB2));
     if (UNTAG_Bool(REGB2)) {
-      /* ./syntax//icode_generation.nit:1019 */
+      /* ./syntax//icode_generation.nit:1055 */
       fra.me.REG[5] = NEW_ICall_icode___icode_base___ICall___init(fra.me.REG[3], fra.me.REG[2]);
       fra.me.REG[4] = CALL_icode___icode_builder___ICodeBuilder___expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[5], fra.me.REG[4]);
       goto label3;
     } else {
-      /* ./syntax//icode_generation.nit:1021 */
+      /* ./syntax//icode_generation.nit:1057 */
       fra.me.REG[5] = NEW_ICall_icode___icode_base___ICall___init(fra.me.REG[3], fra.me.REG[2]);
       CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[5]);
-      /* ./syntax//icode_generation.nit:1022 */
+      /* ./syntax//icode_generation.nit:1058 */
       fra.me.REG[4] = NIT_NULL;
       goto label3;
     }
   } else {
-    /* ./syntax//icode_generation.nit:1025 */
+    /* ./syntax//icode_generation.nit:1061 */
     fra.me.REG[0] = CALL_syntax___syntax_base___AAbsSendExpr___prop(fra.me.REG[0])(fra.me.REG[0]);
     fra.me.REG[3] = fra.me.REG[0];
-    /* ./syntax//icode_generation.nit:1026 */
+    /* ./syntax//icode_generation.nit:1062 */
     REGB2 = TAG_Bool(fra.me.REG[3]==NIT_NULL);
     if (UNTAG_Bool(REGB2)) {
-      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1026);
+      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1062);
     }
     fra.me.REG[0] = CALL_metamodel___static_type___MMLocalProperty___signature(fra.me.REG[3])(fra.me.REG[3]);
     REGB2 = TAG_Bool(fra.me.REG[0]==NIT_NULL);
     if (UNTAG_Bool(REGB2)) {
-      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1026);
+      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1062);
     }
     fra.me.REG[0] = CALL_metamodel___static_type___MMSignature___return_type(fra.me.REG[0])(fra.me.REG[0]);
-    /* ./syntax//icode_generation.nit:1027 */
+    /* ./syntax//icode_generation.nit:1063 */
     REGB2 = TAG_Bool(fra.me.REG[0]==NIT_NULL);
     if (UNTAG_Bool(REGB2)) {
     } else {
@@ -5070,14 +5339,14 @@ val_t syntax___icode_generation___ASuperExpr___generate_icode(val_t p0, val_t p1
       }
     }
     if (UNTAG_Bool(REGB2)) {
-      /* ./syntax//icode_generation.nit:1028 */
+      /* ./syntax//icode_generation.nit:1064 */
       fra.me.REG[5] = NEW_ISuper_icode___icode_base___ISuper___init(fra.me.REG[3], fra.me.REG[2]);
       CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[5]);
-      /* ./syntax//icode_generation.nit:1029 */
+      /* ./syntax//icode_generation.nit:1065 */
       fra.me.REG[4] = NIT_NULL;
       goto label3;
     } else {
-      /* ./syntax//icode_generation.nit:1031 */
+      /* ./syntax//icode_generation.nit:1067 */
       fra.me.REG[2] = NEW_ISuper_icode___icode_base___ISuper___init(fra.me.REG[3], fra.me.REG[2]);
       fra.me.REG[0] = CALL_icode___icode_builder___ICodeBuilder___expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2], fra.me.REG[0]);
       fra.me.REG[4] = fra.me.REG[0];
@@ -5098,12 +5367,13 @@ val_t syntax___icode_generation___ASuperExpr___generate_icode(val_t p0, val_t p1
       fra.me.meth = LOCATE_syntax___icode_generation___ASuperExpr___generate_icode;
       fra.me.has_broke = 0;
       fra.me.REG_size = 1;
+      fra.me.nitni_local_ref_head = NULL;
       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;
-      /* ./syntax//icode_generation.nit:1012 */
+      /* ./syntax//icode_generation.nit:1048 */
       fra.me.REG[0] = CALL_syntax___icode_generation___A2IContext___generate_expr(closctx->REG[1])(closctx->REG[1], fra.me.REG[0]);
       CALL_standard___collection___abstract_collection___SimpleCollection___add(closctx->REG[2])(closctx->REG[2], fra.me.REG[0]);
       stack_frame_head = fra.me.prev;
@@ -5115,27 +5385,28 @@ val_t syntax___icode_generation___AAttrExpr___generate_icode(val_t p0, val_t p1)
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 1038;
+  fra.me.line = 1074;
   fra.me.meth = LOCATE_syntax___icode_generation___AAttrExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 4;
+  fra.me.nitni_local_ref_head = NULL;
   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;
-  /* ./syntax//icode_generation.nit:1040 */
+  /* ./syntax//icode_generation.nit:1076 */
   fra.me.REG[2] = CALL_parser___parser_nodes___AAttrFormExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[2] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:1041 */
+  /* ./syntax//icode_generation.nit:1077 */
   fra.me.REG[3] = CALL_parser___parser_nodes___AAttrFormExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[3] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[3])(fra.me.REG[3]);
   REGB0 = CALL_metamodel___static_type___MMType___is_nullable(fra.me.REG[3])(fra.me.REG[3]);
   if (UNTAG_Bool(REGB0)) {
     CALL_icode___icode_builder___ICodeBuilder___add_null_reciever_check(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
   }
-  /* ./syntax//icode_generation.nit:1042 */
+  /* ./syntax//icode_generation.nit:1078 */
   fra.me.REG[0] = CALL_syntax___syntax_base___AAttrFormExpr___prop(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[2] = CALL_icode___icode_builder___ICodeBuilder___add_attr_read(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0], fra.me.REG[2]);
   goto label1;
@@ -5149,34 +5420,35 @@ val_t syntax___icode_generation___AAttrAssignExpr___generate_icode(val_t p0, val
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 1047;
+  fra.me.line = 1083;
   fra.me.meth = LOCATE_syntax___icode_generation___AAttrAssignExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 4;
+  fra.me.nitni_local_ref_head = NULL;
   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;
-  /* ./syntax//icode_generation.nit:1049 */
+  /* ./syntax//icode_generation.nit:1085 */
   fra.me.REG[2] = CALL_parser___parser_nodes___AAttrFormExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[2] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:1050 */
+  /* ./syntax//icode_generation.nit:1086 */
   fra.me.REG[3] = CALL_parser___parser_nodes___AAttrFormExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[3] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[3])(fra.me.REG[3]);
   REGB0 = CALL_metamodel___static_type___MMType___is_nullable(fra.me.REG[3])(fra.me.REG[3]);
   if (UNTAG_Bool(REGB0)) {
     CALL_icode___icode_builder___ICodeBuilder___add_null_reciever_check(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
   }
-  /* ./syntax//icode_generation.nit:1051 */
+  /* ./syntax//icode_generation.nit:1087 */
   fra.me.REG[3] = CALL_parser___parser_nodes___AAssignFormExpr___n_value(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[3] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:1052 */
+  /* ./syntax//icode_generation.nit:1088 */
   fra.me.REG[0] = CALL_syntax___syntax_base___AAttrFormExpr___prop(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[3] = NEW_IAttrWrite_icode___icode_base___IAttrWrite___init(fra.me.REG[0], fra.me.REG[2], fra.me.REG[3]);
   CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:1053 */
+  /* ./syntax//icode_generation.nit:1089 */
   fra.me.REG[3] = NIT_NULL;
   goto label1;
   label1: while(0);
@@ -5189,10 +5461,11 @@ val_t syntax___icode_generation___AAttrReassignExpr___generate_icode(val_t p0, v
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 1057;
+  fra.me.line = 1093;
   fra.me.meth = LOCATE_syntax___icode_generation___AAttrReassignExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 7;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -5202,25 +5475,25 @@ val_t syntax___icode_generation___AAttrReassignExpr___generate_icode(val_t p0, v
   fra.me.REG[6] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:1059 */
+  /* ./syntax//icode_generation.nit:1095 */
   fra.me.REG[2] = CALL_parser___parser_nodes___AAttrFormExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[2] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:1060 */
+  /* ./syntax//icode_generation.nit:1096 */
   fra.me.REG[3] = CALL_parser___parser_nodes___AAttrFormExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[3] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[3])(fra.me.REG[3]);
   REGB0 = CALL_metamodel___static_type___MMType___is_nullable(fra.me.REG[3])(fra.me.REG[3]);
   if (UNTAG_Bool(REGB0)) {
     CALL_icode___icode_builder___ICodeBuilder___add_null_reciever_check(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
   }
-  /* ./syntax//icode_generation.nit:1061 */
+  /* ./syntax//icode_generation.nit:1097 */
   fra.me.REG[3] = CALL_syntax___syntax_base___AAttrFormExpr___prop(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[3] = NEW_IAttrRead_icode___icode_base___IAttrRead___init(fra.me.REG[3], fra.me.REG[2]);
   fra.me.REG[4] = CALL_syntax___syntax_base___AAttrFormExpr___attr_type(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[4] = CALL_icode___icode_builder___ICodeBuilder___expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3], fra.me.REG[4]);
-  /* ./syntax//icode_generation.nit:1062 */
+  /* ./syntax//icode_generation.nit:1098 */
   fra.me.REG[3] = CALL_parser___parser_nodes___AReassignFormExpr___n_value(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[3] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:1063 */
+  /* ./syntax//icode_generation.nit:1099 */
   fra.me.REG[5] = CALL_syntax___syntax_base___AReassignFormExpr___assign_method(fra.me.REG[0])(fra.me.REG[0]);
   REGB0 = TAG_Int(2);
   fra.me.REG[6] = NEW_Array_standard___collection___array___Array___with_capacity(REGB0);
@@ -5229,11 +5502,11 @@ val_t syntax___icode_generation___AAttrReassignExpr___generate_icode(val_t p0, v
   fra.me.REG[6] = NEW_ICall_icode___icode_base___ICall___init(fra.me.REG[5], fra.me.REG[6]);
   fra.me.REG[5] = CALL_syntax___syntax_base___AAttrFormExpr___attr_type(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[5] = CALL_icode___icode_builder___ICodeBuilder___expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[6], fra.me.REG[5]);
-  /* ./syntax//icode_generation.nit:1064 */
+  /* ./syntax//icode_generation.nit:1100 */
   fra.me.REG[0] = CALL_syntax___syntax_base___AAttrFormExpr___prop(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[5] = NEW_IAttrWrite_icode___icode_base___IAttrWrite___init(fra.me.REG[0], fra.me.REG[2], fra.me.REG[5]);
   CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[5]);
-  /* ./syntax//icode_generation.nit:1065 */
+  /* ./syntax//icode_generation.nit:1101 */
   fra.me.REG[5] = NIT_NULL;
   goto label1;
   label1: while(0);
@@ -5246,27 +5519,28 @@ val_t syntax___icode_generation___AIssetAttrExpr___generate_icode(val_t p0, val_
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 1070;
+  fra.me.line = 1106;
   fra.me.meth = LOCATE_syntax___icode_generation___AIssetAttrExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 4;
+  fra.me.nitni_local_ref_head = NULL;
   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;
-  /* ./syntax//icode_generation.nit:1072 */
+  /* ./syntax//icode_generation.nit:1108 */
   fra.me.REG[2] = CALL_parser___parser_nodes___AAttrFormExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[2] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:1073 */
+  /* ./syntax//icode_generation.nit:1109 */
   fra.me.REG[3] = CALL_parser___parser_nodes___AAttrFormExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[3] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[3])(fra.me.REG[3]);
   REGB0 = CALL_metamodel___static_type___MMType___is_nullable(fra.me.REG[3])(fra.me.REG[3]);
   if (UNTAG_Bool(REGB0)) {
     CALL_icode___icode_builder___ICodeBuilder___add_null_reciever_check(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
   }
-  /* ./syntax//icode_generation.nit:1074 */
+  /* ./syntax//icode_generation.nit:1110 */
   fra.me.REG[3] = CALL_syntax___syntax_base___AAttrFormExpr___prop(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[2] = NEW_IAttrIsset_icode___icode_base___IAttrIsset___init(fra.me.REG[3], fra.me.REG[2]);
   fra.me.REG[0] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[0])(fra.me.REG[0]);
@@ -5292,10 +5566,11 @@ void syntax___icode_generation___AAbsAbsSendExpr___generate_icode_for_arguments_
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 1079;
+  fra.me.line = 1115;
   fra.me.meth = LOCATE_syntax___icode_generation___AAbsAbsSendExpr___generate_icode_for_arguments_in;
   fra.me.has_broke = 0;
   fra.me.REG_size = 7;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -5307,90 +5582,90 @@ void syntax___icode_generation___AAbsAbsSendExpr___generate_icode_for_arguments_
   fra.me.REG[1] = p1;
   fra.me.REG[2] = p2;
   fra.me.REG[3] = p3;
-  /* ./syntax//icode_generation.nit:1082 */
+  /* ./syntax//icode_generation.nit:1118 */
   REGB0 = CALL_metamodel___static_type___MMSignature___arity(fra.me.REG[3])(fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:1083 */
+  /* ./syntax//icode_generation.nit:1119 */
   REGB1 = CALL_metamodel___vararg___MMSignature___vararg_rank(fra.me.REG[3])(fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:1084 */
+  /* ./syntax//icode_generation.nit:1120 */
   fra.me.REG[0] = CALL_syntax___syntax_base___AAbsAbsSendExpr___raw_arguments(fra.me.REG[0])(fra.me.REG[0]);
-  /* ./../lib/standard//collection//array.nit:23 */
+  /* ./../lib/standard//collection//array.nit:24 */
   REGB2 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
   if (UNTAG_Bool(REGB2)) {
   } else {
-    nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 23);
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 24);
   }
   REGB2 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:1086 */
+  /* ./syntax//icode_generation.nit:1122 */
   REGB3 = TAG_Int(0);
-  /* ./syntax//icode_generation.nit:1087 */
+  /* ./syntax//icode_generation.nit:1123 */
   REGB4 = TAG_Int(0);
-  /* ./../lib/standard//kernel.nit:330 */
+  /* ./../lib/standard//kernel.nit:347 */
   REGB5 = REGB0;
-  /* ./../lib/standard//kernel.nit:335 */
+  /* ./../lib/standard//kernel.nit:352 */
   while(1) {
     REGB6 = TAG_Bool(VAL_ISA(REGB5, VTCOLOR_standard___kernel___Comparable___OTHER(REGB4), VTID_standard___kernel___Comparable___OTHER(REGB4))) /*cast OTHER*/;
     if (UNTAG_Bool(REGB6)) {
     } else {
       nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
     }
-    /* ./../lib/standard//kernel.nit:215 */
+    /* ./../lib/standard//kernel.nit:232 */
     REGB6 = TAG_Bool(UNTAG_Int(REGB4)<UNTAG_Int(REGB5));
-    /* ./../lib/standard//kernel.nit:335 */
+    /* ./../lib/standard//kernel.nit:352 */
     if (UNTAG_Bool(REGB6)) {
-      /* ./syntax//icode_generation.nit:1087 */
+      /* ./syntax//icode_generation.nit:1123 */
       REGB6 = REGB4;
-      /* ./syntax//icode_generation.nit:1089 */
+      /* ./syntax//icode_generation.nit:1125 */
       fra.me.REG[4] = CALL_metamodel___static_type___MMSignature_____bra(fra.me.REG[3])(fra.me.REG[3], REGB6);
-      /* ./syntax//icode_generation.nit:1090 */
+      /* ./syntax//icode_generation.nit:1126 */
       REGB7 = TAG_Bool(IS_EQUAL_OO(REGB6,REGB1));
       if (UNTAG_Bool(REGB7)) {
       } else {
-        /* ./../lib/standard//kernel.nit:210 */
+        /* ./../lib/standard//kernel.nit:227 */
         REGB6 = TAG_Bool((REGB6)==(REGB1));
-        /* ./syntax//icode_generation.nit:1090 */
+        /* ./syntax//icode_generation.nit:1126 */
         REGB7 = REGB6;
       }
       if (UNTAG_Bool(REGB7)) {
-        /* ./syntax//icode_generation.nit:1091 */
+        /* ./syntax//icode_generation.nit:1127 */
         fra.me.REG[5] = CALL_syntax___icode_generation___A2IContext___visitor(fra.me.REG[1])(fra.me.REG[1]);
         fra.me.REG[4] = CALL_syntax___syntax_base___AbsSyntaxVisitor___type_array(fra.me.REG[5])(fra.me.REG[5], fra.me.REG[4]);
-        /* ./../lib/standard//kernel.nit:220 */
+        /* ./../lib/standard//kernel.nit:237 */
         REGB7 = TAG_Int(UNTAG_Int(REGB2)-UNTAG_Int(REGB0));
-        /* ./syntax//icode_generation.nit:1091 */
+        /* ./syntax//icode_generation.nit:1127 */
         fra.me.REG[4] = CALL_syntax___icode_generation___A2IContext___add_new_array(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4], REGB7);
-        /* ./syntax//icode_generation.nit:1092 */
+        /* ./syntax//icode_generation.nit:1128 */
         REGB7 = TAG_Int(0);
-        /* ./../lib/standard//kernel.nit:220 */
+        /* ./../lib/standard//kernel.nit:237 */
         REGB6 = TAG_Int(UNTAG_Int(REGB2)-UNTAG_Int(REGB0));
-        /* ./../lib/standard//kernel.nit:324 */
+        /* ./../lib/standard//kernel.nit:341 */
         while(1) {
           REGB8 = TAG_Bool(VAL_ISA(REGB6, VTCOLOR_standard___kernel___Comparable___OTHER(REGB7), VTID_standard___kernel___Comparable___OTHER(REGB7))) /*cast OTHER*/;
           if (UNTAG_Bool(REGB8)) {
           } else {
             nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
           }
-          /* ./../lib/standard//kernel.nit:214 */
+          /* ./../lib/standard//kernel.nit:231 */
           REGB8 = TAG_Bool(UNTAG_Int(REGB7)<=UNTAG_Int(REGB6));
-          /* ./../lib/standard//kernel.nit:324 */
+          /* ./../lib/standard//kernel.nit:341 */
           if (UNTAG_Bool(REGB8)) {
-            /* ./../lib/standard//collection//array.nit:241 */
+            /* ./../lib/standard//collection//array.nit:278 */
             fra.me.REG[5] = fra.me.REG[0];
             REGB8 = REGB3;
-            /* ./../lib/standard//collection//array.nit:243 */
+            /* ./../lib/standard//collection//array.nit:280 */
             REGB9 = TAG_Int(0);
             REGB10 = TAG_Bool(VAL_ISA(REGB9, VTCOLOR_standard___kernel___Comparable___OTHER(REGB8), VTID_standard___kernel___Comparable___OTHER(REGB8))) /*cast OTHER*/;
             if (UNTAG_Bool(REGB10)) {
             } else {
               nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
             }
-            /* ./../lib/standard//kernel.nit:216 */
+            /* ./../lib/standard//kernel.nit:233 */
             REGB9 = TAG_Bool(UNTAG_Int(REGB8)>=UNTAG_Int(REGB9));
-            /* ./../lib/standard//collection//array.nit:243 */
+            /* ./../lib/standard//collection//array.nit:280 */
             if (UNTAG_Bool(REGB9)) {
               REGB9 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[5])!=NIT_NULL);
               if (UNTAG_Bool(REGB9)) {
               } else {
-               nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 243);
+               nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 280);
               }
               REGB9 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[5]);
               REGB10 = TAG_Bool(VAL_ISA(REGB9, VTCOLOR_standard___kernel___Comparable___OTHER(REGB8), VTID_standard___kernel___Comparable___OTHER(REGB8))) /*cast OTHER*/;
@@ -5398,70 +5673,70 @@ void syntax___icode_generation___AAbsAbsSendExpr___generate_icode_for_arguments_
               } else {
                nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
               }
-              /* ./../lib/standard//kernel.nit:215 */
+              /* ./../lib/standard//kernel.nit:232 */
               REGB9 = TAG_Bool(UNTAG_Int(REGB8)<UNTAG_Int(REGB9));
             } else {
-              /* ./../lib/standard//collection//array.nit:243 */
+              /* ./../lib/standard//collection//array.nit:280 */
               REGB10 = TAG_Bool(false);
               REGB9 = REGB10;
             }
             if (UNTAG_Bool(REGB9)) {
             } else {
-              nit_abort("Assert %s  failed", "'index'", LOCATE_standard___collection___array, 243);
+              nit_abort("Assert %s  failed", "'index'", LOCATE_standard___collection___array, 280);
             }
-            /* ./../lib/standard//collection//array.nit:244 */
+            /* ./../lib/standard//collection//array.nit:281 */
             fra.me.REG[5] = ATTR_standard___collection___array___Array____items(fra.me.REG[5]);
             REGB9 = TAG_Bool(fra.me.REG[5]==NIT_NULL);
             if (UNTAG_Bool(REGB9)) {
-              nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 244);
+              nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 281);
             }
-            /* ./../lib/standard//collection//array.nit:652 */
+            /* ./../lib/standard//collection//array.nit:718 */
             fra.me.REG[5] = ((Nit_NativeArray)fra.me.REG[5])->val[UNTAG_Int(REGB8)];
-            /* ./../lib/standard//collection//array.nit:244 */
+            /* ./../lib/standard//collection//array.nit:281 */
             goto label1;
             label1: while(0);
-            /* ./syntax//icode_generation.nit:1094 */
+            /* ./syntax//icode_generation.nit:1130 */
             fra.me.REG[6] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[5]);
             CALL_syntax___icode_generation___A2IContext___add_call_array_add(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4], fra.me.REG[6]);
-            /* ./syntax//icode_generation.nit:1095 */
+            /* ./syntax//icode_generation.nit:1131 */
             REGB8 = TAG_Int(1);
-            /* ./../lib/standard//kernel.nit:218 */
+            /* ./../lib/standard//kernel.nit:235 */
             REGB8 = TAG_Int(UNTAG_Int(REGB3)+UNTAG_Int(REGB8));
-            /* ./syntax//icode_generation.nit:1095 */
+            /* ./syntax//icode_generation.nit:1131 */
             REGB3 = REGB8;
-            /* ./../lib/standard//kernel.nit:326 */
+            /* ./../lib/standard//kernel.nit:343 */
             REGB8 = TAG_Int(1);
-            /* ./../lib/standard//kernel.nit:218 */
+            /* ./../lib/standard//kernel.nit:235 */
             REGB8 = TAG_Int(UNTAG_Int(REGB7)+UNTAG_Int(REGB8));
-            /* ./../lib/standard//kernel.nit:326 */
+            /* ./../lib/standard//kernel.nit:343 */
             REGB7 = REGB8;
           } else {
-            /* ./../lib/standard//kernel.nit:324 */
+            /* ./../lib/standard//kernel.nit:341 */
             goto label2;
           }
         }
         label2: while(0);
-        /* ./syntax//icode_generation.nit:1097 */
+        /* ./syntax//icode_generation.nit:1133 */
         CALL_standard___collection___abstract_collection___SimpleCollection___add(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[4]);
       } else {
-        /* ./../lib/standard//collection//array.nit:241 */
+        /* ./../lib/standard//collection//array.nit:278 */
         fra.me.REG[4] = fra.me.REG[0];
         REGB7 = REGB3;
-        /* ./../lib/standard//collection//array.nit:243 */
+        /* ./../lib/standard//collection//array.nit:280 */
         REGB6 = TAG_Int(0);
         REGB8 = TAG_Bool(VAL_ISA(REGB6, VTCOLOR_standard___kernel___Comparable___OTHER(REGB7), VTID_standard___kernel___Comparable___OTHER(REGB7))) /*cast OTHER*/;
         if (UNTAG_Bool(REGB8)) {
         } else {
           nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
         }
-        /* ./../lib/standard//kernel.nit:216 */
+        /* ./../lib/standard//kernel.nit:233 */
         REGB6 = TAG_Bool(UNTAG_Int(REGB7)>=UNTAG_Int(REGB6));
-        /* ./../lib/standard//collection//array.nit:243 */
+        /* ./../lib/standard//collection//array.nit:280 */
         if (UNTAG_Bool(REGB6)) {
           REGB6 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[4])!=NIT_NULL);
           if (UNTAG_Bool(REGB6)) {
           } else {
-            nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 243);
+            nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 280);
           }
           REGB6 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[4]);
           REGB8 = TAG_Bool(VAL_ISA(REGB6, VTCOLOR_standard___kernel___Comparable___OTHER(REGB7), VTID_standard___kernel___Comparable___OTHER(REGB7))) /*cast OTHER*/;
@@ -5469,48 +5744,48 @@ void syntax___icode_generation___AAbsAbsSendExpr___generate_icode_for_arguments_
           } else {
             nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
           }
-          /* ./../lib/standard//kernel.nit:215 */
+          /* ./../lib/standard//kernel.nit:232 */
           REGB6 = TAG_Bool(UNTAG_Int(REGB7)<UNTAG_Int(REGB6));
         } else {
-          /* ./../lib/standard//collection//array.nit:243 */
+          /* ./../lib/standard//collection//array.nit:280 */
           REGB8 = TAG_Bool(false);
           REGB6 = REGB8;
         }
         if (UNTAG_Bool(REGB6)) {
         } else {
-          nit_abort("Assert %s  failed", "'index'", LOCATE_standard___collection___array, 243);
+          nit_abort("Assert %s  failed", "'index'", LOCATE_standard___collection___array, 280);
         }
-        /* ./../lib/standard//collection//array.nit:244 */
+        /* ./../lib/standard//collection//array.nit:281 */
         fra.me.REG[4] = ATTR_standard___collection___array___Array____items(fra.me.REG[4]);
         REGB6 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
         if (UNTAG_Bool(REGB6)) {
-          nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 244);
+          nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 281);
         }
-        /* ./../lib/standard//collection//array.nit:652 */
+        /* ./../lib/standard//collection//array.nit:718 */
         fra.me.REG[4] = ((Nit_NativeArray)fra.me.REG[4])->val[UNTAG_Int(REGB7)];
-        /* ./../lib/standard//collection//array.nit:244 */
+        /* ./../lib/standard//collection//array.nit:281 */
         goto label3;
         label3: while(0);
-        /* ./syntax//icode_generation.nit:1099 */
+        /* ./syntax//icode_generation.nit:1135 */
         fra.me.REG[5] = fra.me.REG[4];
-        /* ./syntax//icode_generation.nit:1100 */
+        /* ./syntax//icode_generation.nit:1136 */
         fra.me.REG[5] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[5]);
         CALL_standard___collection___abstract_collection___SimpleCollection___add(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[5]);
-        /* ./syntax//icode_generation.nit:1101 */
+        /* ./syntax//icode_generation.nit:1137 */
         REGB7 = TAG_Int(1);
-        /* ./../lib/standard//kernel.nit:218 */
+        /* ./../lib/standard//kernel.nit:235 */
         REGB7 = TAG_Int(UNTAG_Int(REGB3)+UNTAG_Int(REGB7));
-        /* ./syntax//icode_generation.nit:1101 */
+        /* ./syntax//icode_generation.nit:1137 */
         REGB3 = REGB7;
       }
-      /* ./../lib/standard//kernel.nit:337 */
+      /* ./../lib/standard//kernel.nit:354 */
       REGB7 = TAG_Int(1);
-      /* ./../lib/standard//kernel.nit:218 */
+      /* ./../lib/standard//kernel.nit:235 */
       REGB7 = TAG_Int(UNTAG_Int(REGB4)+UNTAG_Int(REGB7));
-      /* ./../lib/standard//kernel.nit:337 */
+      /* ./../lib/standard//kernel.nit:354 */
       REGB4 = REGB7;
     } else {
-      /* ./../lib/standard//kernel.nit:335 */
+      /* ./../lib/standard//kernel.nit:352 */
       goto label4;
     }
   }
@@ -5528,10 +5803,11 @@ val_t syntax___icode_generation___ASendExpr___generate_icode(val_t p0, val_t p1)
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 1108;
+  fra.me.line = 1144;
   fra.me.meth = LOCATE_syntax___icode_generation___ASendExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 16;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -5550,41 +5826,41 @@ val_t syntax___icode_generation___ASendExpr___generate_icode(val_t p0, val_t p1)
   fra.me.REG[15] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:1108 */
+  /* ./syntax//icode_generation.nit:1144 */
   fra.me.REG[2] = fra.me.REG[0];
-  /* ./syntax//icode_generation.nit:1110 */
+  /* ./syntax//icode_generation.nit:1146 */
   fra.me.REG[3] = CALL_parser___parser_nodes___ASendExpr___n_expr(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[3] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:1111 */
+  /* ./syntax//icode_generation.nit:1147 */
   fra.me.REG[4] = NEW_Array_standard___collection___array___Array___init();
-  /* ./syntax//icode_generation.nit:1112 */
+  /* ./syntax//icode_generation.nit:1148 */
   CALL_standard___collection___abstract_collection___SimpleCollection___add(fra.me.REG[4])(fra.me.REG[4], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:1113 */
+  /* ./syntax//icode_generation.nit:1149 */
   fra.me.REG[3] = CALL_syntax___syntax_base___AAbsSendExpr___prop(fra.me.REG[2])(fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:1114 */
+  /* ./syntax//icode_generation.nit:1150 */
   fra.me.REG[5] = CALL_metamodel___static_type___MMLocalProperty___signature(fra.me.REG[3])(fra.me.REG[3]);
   REGB0 = TAG_Bool((fra.me.REG[5]!=NIT_NULL) && VAL_ISA(fra.me.REG[5], COLOR_metamodel___static_type___MMSignature, ID_metamodel___static_type___MMSignature)) /*cast MMSignature*/;
   if (UNTAG_Bool(REGB0)) {
   } else {
-    nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 1114);
+    nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 1150);
   }
   CALL_syntax___icode_generation___AAbsAbsSendExpr___generate_icode_for_arguments_in(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[1], fra.me.REG[4], fra.me.REG[5]);
-  /* ./syntax//icode_generation.nit:1115 */
+  /* ./syntax//icode_generation.nit:1151 */
   fra.me.REG[5] = NIT_NULL;
-  /* ./syntax//icode_generation.nit:1119 */
+  /* ./syntax//icode_generation.nit:1155 */
   fra.me.REG[0] = CALL_icode___icode_builder___ICodeBuilder___seq(fra.me.REG[1])(fra.me.REG[1]);
-  /* ./syntax//icode_generation.nit:1120 */
+  /* ./syntax//icode_generation.nit:1156 */
   fra.me.REG[6] = NIT_NULL;
-  /* ./syntax//icode_generation.nit:1121 */
+  /* ./syntax//icode_generation.nit:1157 */
   fra.me.REG[7] = CALL_syntax___syntax_base___AAbsAbsSendExpr___prop_signature(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[7] = CALL_metamodel___static_type___MMSignature___closures(fra.me.REG[7])(fra.me.REG[7]);
   REGB0 = CALL_standard___collection___abstract_collection___Collection___is_empty(fra.me.REG[7])(fra.me.REG[7]);
   REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
   if (UNTAG_Bool(REGB0)) {
-    /* ./syntax//icode_generation.nit:1122 */
+    /* ./syntax//icode_generation.nit:1158 */
     fra.me.REG[7] = CALL_syntax___syntax_base___AAbsAbsSendExpr___prop_signature(fra.me.REG[2])(fra.me.REG[2]);
     fra.me.REG[7] = CALL_metamodel___static_type___MMSignature___return_type(fra.me.REG[7])(fra.me.REG[7]);
-    /* ./syntax//icode_generation.nit:1123 */
+    /* ./syntax//icode_generation.nit:1159 */
     REGB0 = TAG_Bool(fra.me.REG[7]==NIT_NULL);
     if (UNTAG_Bool(REGB0)) {
     } else {
@@ -5599,22 +5875,22 @@ val_t syntax___icode_generation___ASendExpr___generate_icode(val_t p0, val_t p1)
     }
     REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
     if (UNTAG_Bool(REGB0)) {
-      /* ./syntax//icode_generation.nit:1124 */
+      /* ./syntax//icode_generation.nit:1160 */
       fra.me.REG[7] = CALL_icode___icode_builder___ICodeBuilder___new_register(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[7]);
       fra.me.REG[5] = fra.me.REG[7];
     }
-    /* ./syntax//icode_generation.nit:1126 */
+    /* ./syntax//icode_generation.nit:1162 */
     fra.me.REG[7] = NEW_ISeq_icode___icode_base___ISeq___init();
-    /* ./syntax//icode_generation.nit:1127 */
+    /* ./syntax//icode_generation.nit:1163 */
     CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[7]);
-    /* ./syntax//icode_generation.nit:1128 */
+    /* ./syntax//icode_generation.nit:1164 */
     CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[7]);
-    /* ./syntax//icode_generation.nit:1129 */
+    /* ./syntax//icode_generation.nit:1165 */
     fra.me.REG[8] = NEW_Array_standard___collection___array___Array___init();
     fra.me.REG[6] = fra.me.REG[8];
-    /* ./syntax//icode_generation.nit:1130 */
+    /* ./syntax//icode_generation.nit:1166 */
     REGB0 = TAG_Int(0);
-    /* ./syntax//icode_generation.nit:1131 */
+    /* ./syntax//icode_generation.nit:1167 */
     fra.me.REG[8] = CALL_syntax___syntax_base___ASendExpr___closure_defs(fra.me.REG[2])(fra.me.REG[2]);
     REGB0 = TAG_Bool(fra.me.REG[8]==NIT_NULL);
     if (UNTAG_Bool(REGB0)) {
@@ -5633,39 +5909,39 @@ val_t syntax___icode_generation___ASendExpr___generate_icode(val_t p0, val_t p1)
       fra.me.REG[8] = CALL_syntax___syntax_base___ASendExpr___closure_defs(fra.me.REG[2])(fra.me.REG[2]);
       REGB0 = TAG_Bool(fra.me.REG[8]==NIT_NULL);
       if (UNTAG_Bool(REGB0)) {
-        nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1131);
+        nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1167);
       }
-      /* ./../lib/standard//collection//array.nit:23 */
+      /* ./../lib/standard//collection//array.nit:24 */
       REGB0 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[8])!=NIT_NULL);
       if (UNTAG_Bool(REGB0)) {
       } else {
-        nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 23);
+        nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 24);
       }
       REGB0 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[8]);
     }
-    /* ./syntax//icode_generation.nit:1132 */
+    /* ./syntax//icode_generation.nit:1168 */
     fra.me.REG[8] = CALL_syntax___syntax_base___ASendExpr___closure_defs(fra.me.REG[2])(fra.me.REG[2]);
-    /* ./syntax//icode_generation.nit:1133 */
+    /* ./syntax//icode_generation.nit:1169 */
     fra.me.REG[9] = CALL_syntax___syntax_base___AAbsAbsSendExpr___prop_signature(fra.me.REG[2])(fra.me.REG[2]);
     fra.me.REG[9] = CALL_metamodel___static_type___MMSignature___closures(fra.me.REG[9])(fra.me.REG[9]);
-    /* ./../lib/standard//collection//array.nit:232 */
+    /* ./../lib/standard//collection//array.nit:269 */
     REGB0 = TAG_Int(0);
-    /* ./../lib/standard//collection//array.nit:233 */
+    /* ./../lib/standard//collection//array.nit:270 */
     REGB1 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[9])!=NIT_NULL);
     if (UNTAG_Bool(REGB1)) {
     } else {
-      nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 233);
+      nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 270);
     }
     REGB1 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[9]);
-    /* ./../lib/standard//collection//array.nit:234 */
+    /* ./../lib/standard//collection//array.nit:271 */
     fra.me.REG[10] = ATTR_standard___collection___array___Array____items(fra.me.REG[9]);
-    /* ./../lib/standard//collection//array.nit:235 */
+    /* ./../lib/standard//collection//array.nit:272 */
     while(1) {
-      /* ./../lib/standard//collection//array.nit:23 */
+      /* ./../lib/standard//collection//array.nit:24 */
       REGB1 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[9])!=NIT_NULL);
       if (UNTAG_Bool(REGB1)) {
       } else {
-        nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 23);
+        nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 24);
       }
       REGB1 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[9]);
       REGB2 = TAG_Bool(VAL_ISA(REGB1, VTCOLOR_standard___kernel___Comparable___OTHER(REGB0), VTID_standard___kernel___Comparable___OTHER(REGB0))) /*cast OTHER*/;
@@ -5673,22 +5949,22 @@ val_t syntax___icode_generation___ASendExpr___generate_icode(val_t p0, val_t p1)
       } else {
         nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
       }
-      /* ./../lib/standard//kernel.nit:215 */
+      /* ./../lib/standard//kernel.nit:232 */
       REGB1 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB1));
-      /* ./../lib/standard//collection//array.nit:235 */
+      /* ./../lib/standard//collection//array.nit:272 */
       if (UNTAG_Bool(REGB1)) {
-        /* ./../lib/standard//collection//array.nit:236 */
+        /* ./../lib/standard//collection//array.nit:273 */
         REGB1 = TAG_Bool(fra.me.REG[10]==NIT_NULL);
         if (UNTAG_Bool(REGB1)) {
-          nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 236);
+          nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 273);
         }
-        /* ./../lib/standard//collection//array.nit:652 */
+        /* ./../lib/standard//collection//array.nit:718 */
         fra.me.REG[11] = ((Nit_NativeArray)fra.me.REG[10])->val[UNTAG_Int(REGB0)];
-        /* ./syntax//icode_generation.nit:1134 */
+        /* ./syntax//icode_generation.nit:1170 */
         REGB1 = TAG_Bool(false);
-        /* ./syntax//icode_generation.nit:1135 */
+        /* ./syntax//icode_generation.nit:1171 */
         fra.me.REG[11] = CALL_metamodel___static_type___MMClosure___name(fra.me.REG[11])(fra.me.REG[11]);
-        /* ./syntax//icode_generation.nit:1136 */
+        /* ./syntax//icode_generation.nit:1172 */
         REGB2 = TAG_Bool(fra.me.REG[8]==NIT_NULL);
         if (UNTAG_Bool(REGB2)) {
         } else {
@@ -5703,31 +5979,31 @@ val_t syntax___icode_generation___ASendExpr___generate_icode(val_t p0, val_t p1)
         }
         REGB2 = TAG_Bool(!UNTAG_Bool(REGB2));
         if (UNTAG_Bool(REGB2)) {
-          /* ./syntax//icode_generation.nit:1137 */
+          /* ./syntax//icode_generation.nit:1173 */
           REGB2 = TAG_Bool(fra.me.REG[8]==NIT_NULL);
           if (UNTAG_Bool(REGB2)) {
-            nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1137);
+            nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1173);
           }
-          /* ./../lib/standard//collection//array.nit:229 */
+          /* ./../lib/standard//collection//array.nit:266 */
           fra.me.REG[12] = fra.me.REG[8];
-          /* ./../lib/standard//collection//array.nit:232 */
+          /* ./../lib/standard//collection//array.nit:269 */
           REGB2 = TAG_Int(0);
-          /* ./../lib/standard//collection//array.nit:233 */
+          /* ./../lib/standard//collection//array.nit:270 */
           REGB3 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[12])!=NIT_NULL);
           if (UNTAG_Bool(REGB3)) {
           } else {
-            nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 233);
+            nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 270);
           }
           REGB3 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[12]);
-          /* ./../lib/standard//collection//array.nit:234 */
+          /* ./../lib/standard//collection//array.nit:271 */
           fra.me.REG[13] = ATTR_standard___collection___array___Array____items(fra.me.REG[12]);
-          /* ./../lib/standard//collection//array.nit:235 */
+          /* ./../lib/standard//collection//array.nit:272 */
           while(1) {
-            /* ./../lib/standard//collection//array.nit:23 */
+            /* ./../lib/standard//collection//array.nit:24 */
             REGB3 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[12])!=NIT_NULL);
             if (UNTAG_Bool(REGB3)) {
             } else {
-              nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 23);
+              nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 24);
             }
             REGB3 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[12]);
             REGB4 = TAG_Bool(VAL_ISA(REGB3, VTCOLOR_standard___kernel___Comparable___OTHER(REGB2), VTID_standard___kernel___Comparable___OTHER(REGB2))) /*cast OTHER*/;
@@ -5735,18 +6011,18 @@ val_t syntax___icode_generation___ASendExpr___generate_icode(val_t p0, val_t p1)
             } else {
               nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
             }
-            /* ./../lib/standard//kernel.nit:215 */
+            /* ./../lib/standard//kernel.nit:232 */
             REGB3 = TAG_Bool(UNTAG_Int(REGB2)<UNTAG_Int(REGB3));
-            /* ./../lib/standard//collection//array.nit:235 */
+            /* ./../lib/standard//collection//array.nit:272 */
             if (UNTAG_Bool(REGB3)) {
-              /* ./../lib/standard//collection//array.nit:236 */
+              /* ./../lib/standard//collection//array.nit:273 */
               REGB3 = TAG_Bool(fra.me.REG[13]==NIT_NULL);
               if (UNTAG_Bool(REGB3)) {
-               nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 236);
+               nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 273);
               }
-              /* ./../lib/standard//collection//array.nit:652 */
+              /* ./../lib/standard//collection//array.nit:718 */
               fra.me.REG[14] = ((Nit_NativeArray)fra.me.REG[13])->val[UNTAG_Int(REGB2)];
-              /* ./syntax//icode_generation.nit:1138 */
+              /* ./syntax//icode_generation.nit:1174 */
               fra.me.REG[15] = CALL_parser___parser_nodes___AClosureDef___n_id(fra.me.REG[14])(fra.me.REG[14]);
               fra.me.REG[15] = CALL_syntax___typing___AClosureId___to_symbol(fra.me.REG[15])(fra.me.REG[15]);
               REGB3 = TAG_Bool(IS_EQUAL_OO(fra.me.REG[15],fra.me.REG[11]));
@@ -5759,91 +6035,91 @@ val_t syntax___icode_generation___ASendExpr___generate_icode(val_t p0, val_t p1)
               if (UNTAG_Bool(REGB3)) {
                goto label1;
               }
-              /* ./syntax//icode_generation.nit:1139 */
+              /* ./syntax//icode_generation.nit:1175 */
               REGB3 = TAG_Bool(false);
               REGB4 = TAG_Bool(IS_EQUAL_OO(REGB1,REGB3));
               if (UNTAG_Bool(REGB4)) {
               } else {
-               /* ./../lib/standard//kernel.nit:178 */
+               /* ./../lib/standard//kernel.nit:195 */
                REGB3 = TAG_Bool((REGB1)==(REGB3));
-               /* ./syntax//icode_generation.nit:1139 */
+               /* ./syntax//icode_generation.nit:1175 */
                REGB4 = REGB3;
               }
               if (UNTAG_Bool(REGB4)) {
               } else {
-               nit_abort("Assert failed", NULL, LOCATE_syntax___icode_generation, 1139);
+               nit_abort("Assert failed", NULL, LOCATE_syntax___icode_generation, 1175);
               }
-              /* ./syntax//icode_generation.nit:1140 */
+              /* ./syntax//icode_generation.nit:1176 */
               REGB4 = TAG_Bool(true);
               REGB1 = REGB4;
-              /* ./syntax//icode_generation.nit:1141 */
+              /* ./syntax//icode_generation.nit:1177 */
               fra.me.REG[15] = CALL_syntax___typing___AClosureDef___escapable(fra.me.REG[14])(fra.me.REG[14]);
               REGB4 = TAG_Bool(fra.me.REG[15]==NIT_NULL);
               if (UNTAG_Bool(REGB4)) {
-               nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1141);
+               nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1177);
               }
               CALL_syntax___icode_generation___EscapableBlock___break_seq__eq(fra.me.REG[15])(fra.me.REG[15], fra.me.REG[7]);
-              /* ./syntax//icode_generation.nit:1142 */
+              /* ./syntax//icode_generation.nit:1178 */
               fra.me.REG[15] = CALL_syntax___typing___AClosureDef___escapable(fra.me.REG[14])(fra.me.REG[14]);
               REGB4 = TAG_Bool(fra.me.REG[15]==NIT_NULL);
               if (UNTAG_Bool(REGB4)) {
-               nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1142);
+               nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1178);
               }
               CALL_syntax___icode_generation___EscapableBlock___break_value__eq(fra.me.REG[15])(fra.me.REG[15], fra.me.REG[5]);
-              /* ./syntax//icode_generation.nit:1143 */
+              /* ./syntax//icode_generation.nit:1179 */
               fra.me.REG[14] = CALL_syntax___icode_generation___AClosureDef___generate_iclosuredef(fra.me.REG[14])(fra.me.REG[14], fra.me.REG[1]);
-              /* ./syntax//icode_generation.nit:1144 */
+              /* ./syntax//icode_generation.nit:1180 */
               REGB4 = TAG_Bool(fra.me.REG[6]==NIT_NULL);
               if (UNTAG_Bool(REGB4)) {
-               nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1144);
+               nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1180);
               }
               CALL_standard___collection___abstract_collection___SimpleCollection___add(fra.me.REG[6])(fra.me.REG[6], fra.me.REG[14]);
               label1: while(0);
-              /* ./../lib/standard//collection//array.nit:237 */
+              /* ./../lib/standard//collection//array.nit:274 */
               REGB4 = TAG_Int(1);
-              /* ./../lib/standard//kernel.nit:218 */
+              /* ./../lib/standard//kernel.nit:235 */
               REGB4 = TAG_Int(UNTAG_Int(REGB2)+UNTAG_Int(REGB4));
-              /* ./../lib/standard//collection//array.nit:237 */
+              /* ./../lib/standard//collection//array.nit:274 */
               REGB2 = REGB4;
             } else {
-              /* ./../lib/standard//collection//array.nit:235 */
+              /* ./../lib/standard//collection//array.nit:272 */
               goto label2;
             }
           }
           label2: while(0);
         }
-        /* ./syntax//icode_generation.nit:1147 */
+        /* ./syntax//icode_generation.nit:1183 */
         REGB1 = TAG_Bool(!UNTAG_Bool(REGB1));
         if (UNTAG_Bool(REGB1)) {
-          /* ./syntax//icode_generation.nit:1148 */
+          /* ./syntax//icode_generation.nit:1184 */
           REGB1 = TAG_Bool(fra.me.REG[6]==NIT_NULL);
           if (UNTAG_Bool(REGB1)) {
-            nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1148);
+            nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1184);
           }
           CALL_standard___collection___abstract_collection___SimpleCollection___add(fra.me.REG[6])(fra.me.REG[6], NIT_NULL);
         }
-        /* ./../lib/standard//collection//array.nit:237 */
+        /* ./../lib/standard//collection//array.nit:274 */
         REGB1 = TAG_Int(1);
-        /* ./../lib/standard//kernel.nit:218 */
+        /* ./../lib/standard//kernel.nit:235 */
         REGB1 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB1));
-        /* ./../lib/standard//collection//array.nit:237 */
+        /* ./../lib/standard//collection//array.nit:274 */
         REGB0 = REGB1;
       } else {
-        /* ./../lib/standard//collection//array.nit:235 */
+        /* ./../lib/standard//collection//array.nit:272 */
         goto label3;
       }
     }
     label3: while(0);
   }
-  /* ./syntax//icode_generation.nit:1153 */
+  /* ./syntax//icode_generation.nit:1189 */
   fra.me.REG[6] = CALL_icode___icode_builder___ICodeBuilder___add_call(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3], fra.me.REG[4], fra.me.REG[6]);
-  /* ./syntax//icode_generation.nit:1156 */
+  /* ./syntax//icode_generation.nit:1192 */
   fra.me.REG[2] = CALL_syntax___syntax_base___AAbsAbsSendExpr___prop_signature(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[2] = CALL_metamodel___static_type___MMSignature___closures(fra.me.REG[2])(fra.me.REG[2]);
   REGB0 = CALL_standard___collection___abstract_collection___Collection___is_empty(fra.me.REG[2])(fra.me.REG[2]);
   REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
   if (UNTAG_Bool(REGB0)) {
-    /* ./syntax//icode_generation.nit:1157 */
+    /* ./syntax//icode_generation.nit:1193 */
     REGB0 = TAG_Bool(fra.me.REG[5]==NIT_NULL);
     if (UNTAG_Bool(REGB0)) {
     } else {
@@ -5878,20 +6154,20 @@ val_t syntax___icode_generation___ASendExpr___generate_icode(val_t p0, val_t p1)
     if (UNTAG_Bool(REGB0)) {
       CALL_icode___icode_builder___ICodeBuilder___add_assignment(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[5], fra.me.REG[6]);
     }
-    /* ./syntax//icode_generation.nit:1158 */
+    /* ./syntax//icode_generation.nit:1194 */
     CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
   } else {
-    /* ./syntax//icode_generation.nit:1160 */
+    /* ./syntax//icode_generation.nit:1196 */
     fra.me.REG[5] = fra.me.REG[6];
   }
-  /* ./syntax//icode_generation.nit:1163 */
+  /* ./syntax//icode_generation.nit:1199 */
   fra.me.REG[6] = CALL_metamodel___abstractmetamodel___MMLocalProperty___global(fra.me.REG[3])(fra.me.REG[3]);
   REGB0 = CALL_metamodel___abstractmetamodel___MMGlobalProperty___is_init(fra.me.REG[6])(fra.me.REG[6]);
   if (UNTAG_Bool(REGB0)) {
-    /* ./syntax//icode_generation.nit:1164 */
+    /* ./syntax//icode_generation.nit:1200 */
     CALL_syntax___icode_generation___A2IContext___invoke_super_init_calls_after(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
   }
-  /* ./syntax//icode_generation.nit:1166 */
+  /* ./syntax//icode_generation.nit:1202 */
   goto label4;
   label4: while(0);
   stack_frame_head = fra.me.prev;
@@ -5903,10 +6179,11 @@ val_t syntax___icode_generation___ASendReassignExpr___generate_icode(val_t p0, v
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 1171;
+  fra.me.line = 1207;
   fra.me.meth = LOCATE_syntax___icode_generation___ASendReassignExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 8;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -5917,51 +6194,51 @@ val_t syntax___icode_generation___ASendReassignExpr___generate_icode(val_t p0, v
   fra.me.REG[7] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:1171 */
+  /* ./syntax//icode_generation.nit:1207 */
   fra.me.REG[2] = fra.me.REG[0];
-  /* ./syntax//icode_generation.nit:1173 */
+  /* ./syntax//icode_generation.nit:1209 */
   fra.me.REG[3] = CALL_parser___parser_nodes___ASendExpr___n_expr(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[3] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:1174 */
+  /* ./syntax//icode_generation.nit:1210 */
   fra.me.REG[4] = CALL_parser___parser_nodes___ASendExpr___n_expr(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[4] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[4])(fra.me.REG[4]);
   REGB0 = CALL_metamodel___static_type___MMType___is_nullable(fra.me.REG[4])(fra.me.REG[4]);
   if (UNTAG_Bool(REGB0)) {
     CALL_icode___icode_builder___ICodeBuilder___add_null_reciever_check(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
   }
-  /* ./syntax//icode_generation.nit:1175 */
+  /* ./syntax//icode_generation.nit:1211 */
   fra.me.REG[4] = NEW_Array_standard___collection___array___Array___init();
-  /* ./syntax//icode_generation.nit:1176 */
+  /* ./syntax//icode_generation.nit:1212 */
   CALL_standard___collection___abstract_collection___SimpleCollection___add(fra.me.REG[4])(fra.me.REG[4], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:1177 */
+  /* ./syntax//icode_generation.nit:1213 */
   fra.me.REG[3] = CALL_syntax___syntax_base___ASendReassignExpr___read_prop(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[3] = CALL_metamodel___static_type___MMLocalProperty___signature(fra.me.REG[3])(fra.me.REG[3]);
   REGB0 = TAG_Bool((fra.me.REG[3]!=NIT_NULL) && VAL_ISA(fra.me.REG[3], COLOR_metamodel___static_type___MMSignature, ID_metamodel___static_type___MMSignature)) /*cast MMSignature*/;
   if (UNTAG_Bool(REGB0)) {
   } else {
-    nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 1177);
+    nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 1213);
   }
   CALL_syntax___icode_generation___AAbsAbsSendExpr___generate_icode_for_arguments_in(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[1], fra.me.REG[4], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:1179 */
+  /* ./syntax//icode_generation.nit:1215 */
   fra.me.REG[3] = CALL_syntax___syntax_base___ASendReassignExpr___read_prop(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[3] = NEW_ICall_icode___icode_base___ICall___init(fra.me.REG[3], fra.me.REG[4]);
   fra.me.REG[5] = CALL_syntax___syntax_base___ASendReassignExpr___read_prop(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[5] = CALL_metamodel___static_type___MMLocalProperty___signature(fra.me.REG[5])(fra.me.REG[5]);
   REGB0 = TAG_Bool(fra.me.REG[5]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
-    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1179);
+    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1215);
   }
   fra.me.REG[5] = CALL_metamodel___static_type___MMSignature___return_type(fra.me.REG[5])(fra.me.REG[5]);
   REGB0 = TAG_Bool((fra.me.REG[5]!=NIT_NULL) && VAL_ISA(fra.me.REG[5], COLOR_metamodel___static_type___MMType, ID_metamodel___static_type___MMType)) /*cast MMType*/;
   if (UNTAG_Bool(REGB0)) {
   } else {
-    nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 1179);
+    nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 1215);
   }
   fra.me.REG[5] = CALL_icode___icode_builder___ICodeBuilder___expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3], fra.me.REG[5]);
-  /* ./syntax//icode_generation.nit:1180 */
+  /* ./syntax//icode_generation.nit:1216 */
   fra.me.REG[3] = CALL_parser___parser_nodes___AReassignFormExpr___n_value(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[3] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:1181 */
+  /* ./syntax//icode_generation.nit:1217 */
   fra.me.REG[6] = CALL_syntax___syntax_base___AReassignFormExpr___assign_method(fra.me.REG[2])(fra.me.REG[2]);
   REGB0 = TAG_Int(2);
   fra.me.REG[7] = NEW_Array_standard___collection___array___Array___with_capacity(REGB0);
@@ -5972,24 +6249,24 @@ val_t syntax___icode_generation___ASendReassignExpr___generate_icode(val_t p0, v
   fra.me.REG[6] = CALL_metamodel___static_type___MMLocalProperty___signature(fra.me.REG[6])(fra.me.REG[6]);
   REGB0 = TAG_Bool(fra.me.REG[6]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
-    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1181);
+    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1217);
   }
   fra.me.REG[6] = CALL_metamodel___static_type___MMSignature___return_type(fra.me.REG[6])(fra.me.REG[6]);
   REGB0 = TAG_Bool((fra.me.REG[6]!=NIT_NULL) && VAL_ISA(fra.me.REG[6], COLOR_metamodel___static_type___MMType, ID_metamodel___static_type___MMType)) /*cast MMType*/;
   if (UNTAG_Bool(REGB0)) {
   } else {
-    nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 1181);
+    nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 1217);
   }
   fra.me.REG[6] = CALL_icode___icode_builder___ICodeBuilder___expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[7], fra.me.REG[6]);
-  /* ./syntax//icode_generation.nit:1182 */
+  /* ./syntax//icode_generation.nit:1218 */
   fra.me.REG[4] = CALL_standard___collection___array___Collection___to_a(fra.me.REG[4])(fra.me.REG[4]);
-  /* ./syntax//icode_generation.nit:1183 */
+  /* ./syntax//icode_generation.nit:1219 */
   CALL_standard___collection___abstract_collection___SimpleCollection___add(fra.me.REG[4])(fra.me.REG[4], fra.me.REG[6]);
-  /* ./syntax//icode_generation.nit:1184 */
+  /* ./syntax//icode_generation.nit:1220 */
   fra.me.REG[2] = CALL_syntax___syntax_base___AAbsSendExpr___prop(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[4] = NEW_ICall_icode___icode_base___ICall___init(fra.me.REG[2], fra.me.REG[4]);
   CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4]);
-  /* ./syntax//icode_generation.nit:1185 */
+  /* ./syntax//icode_generation.nit:1221 */
   fra.me.REG[4] = NIT_NULL;
   goto label1;
   label1: while(0);
@@ -6002,10 +6279,11 @@ val_t syntax___icode_generation___ANewExpr___generate_icode(val_t p0, val_t p1){
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 1190;
+  fra.me.line = 1226;
   fra.me.meth = LOCATE_syntax___icode_generation___ANewExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 5;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -6013,20 +6291,20 @@ val_t syntax___icode_generation___ANewExpr___generate_icode(val_t p0, val_t p1){
   fra.me.REG[4] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:1190 */
+  /* ./syntax//icode_generation.nit:1226 */
   fra.me.REG[2] = fra.me.REG[0];
-  /* ./syntax//icode_generation.nit:1192 */
+  /* ./syntax//icode_generation.nit:1228 */
   fra.me.REG[3] = NEW_Array_standard___collection___array___Array___init();
-  /* ./syntax//icode_generation.nit:1193 */
+  /* ./syntax//icode_generation.nit:1229 */
   fra.me.REG[4] = CALL_syntax___syntax_base___AAbsSendExpr___prop(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[4] = CALL_metamodel___static_type___MMLocalProperty___signature(fra.me.REG[4])(fra.me.REG[4]);
   REGB0 = TAG_Bool((fra.me.REG[4]!=NIT_NULL) && VAL_ISA(fra.me.REG[4], COLOR_metamodel___static_type___MMSignature, ID_metamodel___static_type___MMSignature)) /*cast MMSignature*/;
   if (UNTAG_Bool(REGB0)) {
   } else {
-    nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 1193);
+    nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 1229);
   }
   CALL_syntax___icode_generation___AAbsAbsSendExpr___generate_icode_for_arguments_in(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[1], fra.me.REG[3], fra.me.REG[4]);
-  /* ./syntax//icode_generation.nit:1194 */
+  /* ./syntax//icode_generation.nit:1230 */
   fra.me.REG[4] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[0] = CALL_syntax___syntax_base___AAbsSendExpr___prop(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[3] = NEW_INew_icode___icode_base___INew___init(fra.me.REG[4], fra.me.REG[0], fra.me.REG[3]);
@@ -6042,15 +6320,16 @@ val_t syntax___icode_generation___AProxyExpr___generate_icode(val_t p0, val_t p1
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 1199;
+  fra.me.line = 1235;
   fra.me.meth = LOCATE_syntax___icode_generation___AProxyExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 2;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:1201 */
+  /* ./syntax//icode_generation.nit:1237 */
   fra.me.REG[0] = CALL_parser___parser_nodes___AProxyExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[0] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
   goto label1;
@@ -6063,10 +6342,11 @@ val_t syntax___icode_generation___AOnceExpr___generate_icode(val_t p0, val_t p1)
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 1206;
+  fra.me.line = 1242;
   fra.me.meth = LOCATE_syntax___icode_generation___AOnceExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 5;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -6074,24 +6354,24 @@ val_t syntax___icode_generation___AOnceExpr___generate_icode(val_t p0, val_t p1)
   fra.me.REG[4] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:1208 */
+  /* ./syntax//icode_generation.nit:1244 */
   fra.me.REG[2] = NEW_IOnce_icode___icode_base___IOnce___init();
-  /* ./syntax//icode_generation.nit:1209 */
+  /* ./syntax//icode_generation.nit:1245 */
   fra.me.REG[3] = CALL_syntax___syntax_base___AExpr___stype(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[3] = CALL_icode___icode_builder___ICodeBuilder___expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:1210 */
+  /* ./syntax//icode_generation.nit:1246 */
   fra.me.REG[4] = CALL_icode___icode_builder___ICodeBuilder___seq(fra.me.REG[1])(fra.me.REG[1]);
-  /* ./syntax//icode_generation.nit:1211 */
+  /* ./syntax//icode_generation.nit:1247 */
   fra.me.REG[2] = CALL_icode___icode_base___IOnce___body(fra.me.REG[2])(fra.me.REG[2]);
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:1213 */
+  /* ./syntax//icode_generation.nit:1249 */
   fra.me.REG[0] = CALL_parser___parser_nodes___AProxyExpr___n_expr(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[0] = CALL_syntax___icode_generation___A2IContext___generate_expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:1214 */
+  /* ./syntax//icode_generation.nit:1250 */
   CALL_icode___icode_builder___ICodeBuilder___add_assignment(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3], fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:1216 */
+  /* ./syntax//icode_generation.nit:1252 */
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4]);
-  /* ./syntax//icode_generation.nit:1217 */
+  /* ./syntax//icode_generation.nit:1253 */
   goto label1;
   label1: while(0);
   stack_frame_head = fra.me.prev;
@@ -6108,10 +6388,11 @@ val_t syntax___icode_generation___AClosureDef___generate_iclosuredef(val_t p0, v
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 1225;
+  fra.me.line = 1261;
   fra.me.meth = LOCATE_syntax___icode_generation___AClosureDef___generate_iclosuredef;
   fra.me.has_broke = 0;
   fra.me.REG_size = 7;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -6121,50 +6402,50 @@ val_t syntax___icode_generation___AClosureDef___generate_iclosuredef(val_t p0, v
   fra.me.REG[6] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:1225 */
+  /* ./syntax//icode_generation.nit:1261 */
   fra.me.REG[2] = fra.me.REG[0];
-  /* ./syntax//icode_generation.nit:1228 */
+  /* ./syntax//icode_generation.nit:1264 */
   fra.me.REG[3] = NEW_Array_standard___collection___array___Array___init();
-  /* ./syntax//icode_generation.nit:1229 */
+  /* ./syntax//icode_generation.nit:1265 */
   fra.me.REG[4] = CALL_syntax___syntax_base___AClosureDef___closure(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[4] = CALL_metamodel___static_type___MMClosure___signature(fra.me.REG[4])(fra.me.REG[4]);
-  /* ./syntax//icode_generation.nit:1230 */
+  /* ./syntax//icode_generation.nit:1266 */
   REGB0 = TAG_Int(0);
   REGB1 = CALL_metamodel___static_type___MMSignature___arity(fra.me.REG[4])(fra.me.REG[4]);
-  /* ./../lib/standard//kernel.nit:335 */
+  /* ./../lib/standard//kernel.nit:352 */
   while(1) {
     REGB2 = TAG_Bool(VAL_ISA(REGB1, VTCOLOR_standard___kernel___Comparable___OTHER(REGB0), VTID_standard___kernel___Comparable___OTHER(REGB0))) /*cast OTHER*/;
     if (UNTAG_Bool(REGB2)) {
     } else {
       nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
     }
-    /* ./../lib/standard//kernel.nit:215 */
+    /* ./../lib/standard//kernel.nit:232 */
     REGB2 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB1));
-    /* ./../lib/standard//kernel.nit:335 */
+    /* ./../lib/standard//kernel.nit:352 */
     if (UNTAG_Bool(REGB2)) {
-      /* ./syntax//icode_generation.nit:1230 */
+      /* ./syntax//icode_generation.nit:1266 */
       REGB2 = REGB0;
-      /* ./syntax//icode_generation.nit:1231 */
+      /* ./syntax//icode_generation.nit:1267 */
       fra.me.REG[5] = CALL_metamodel___static_type___MMSignature_____bra(fra.me.REG[4])(fra.me.REG[4], REGB2);
       fra.me.REG[5] = CALL_icode___icode_builder___ICodeBuilder___new_register(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[5]);
       CALL_standard___collection___abstract_collection___SimpleCollection___add(fra.me.REG[3])(fra.me.REG[3], fra.me.REG[5]);
-      /* ./../lib/standard//kernel.nit:337 */
+      /* ./../lib/standard//kernel.nit:354 */
       REGB2 = TAG_Int(1);
-      /* ./../lib/standard//kernel.nit:218 */
+      /* ./../lib/standard//kernel.nit:235 */
       REGB2 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB2));
-      /* ./../lib/standard//kernel.nit:337 */
+      /* ./../lib/standard//kernel.nit:354 */
       REGB0 = REGB2;
     } else {
-      /* ./../lib/standard//kernel.nit:335 */
+      /* ./../lib/standard//kernel.nit:352 */
       goto label1;
     }
   }
   label1: while(0);
-  /* ./syntax//icode_generation.nit:1233 */
+  /* ./syntax//icode_generation.nit:1269 */
   fra.me.REG[5] = NIT_NULL;
-  /* ./syntax//icode_generation.nit:1234 */
+  /* ./syntax//icode_generation.nit:1270 */
   fra.me.REG[4] = CALL_metamodel___static_type___MMSignature___return_type(fra.me.REG[4])(fra.me.REG[4]);
-  /* ./syntax//icode_generation.nit:1235 */
+  /* ./syntax//icode_generation.nit:1271 */
   REGB0 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
   } else {
@@ -6179,86 +6460,86 @@ val_t syntax___icode_generation___AClosureDef___generate_iclosuredef(val_t p0, v
   }
   REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
   if (UNTAG_Bool(REGB0)) {
-    /* ./syntax//icode_generation.nit:1236 */
+    /* ./syntax//icode_generation.nit:1272 */
     fra.me.REG[4] = CALL_icode___icode_builder___ICodeBuilder___new_register(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4]);
     fra.me.REG[5] = fra.me.REG[4];
   }
-  /* ./syntax//icode_generation.nit:1239 */
+  /* ./syntax//icode_generation.nit:1275 */
   fra.me.REG[5] = NEW_IClosureDef_icode___icode_base___IClosureDef___init(fra.me.REG[3], fra.me.REG[5]);
-  /* ./syntax//icode_generation.nit:1240 */
+  /* ./syntax//icode_generation.nit:1276 */
   fra.me.REG[3] = CALL_parser___parser_nodes___ANode___location(fra.me.REG[2])(fra.me.REG[2]);
   CALL_icode___icode_base___IRoutine___location__eq(fra.me.REG[5])(fra.me.REG[5], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:1243 */
+  /* ./syntax//icode_generation.nit:1279 */
   fra.me.REG[3] = CALL_icode___icode_builder___ICodeBuilder___seq(fra.me.REG[1])(fra.me.REG[1]);
-  /* ./syntax//icode_generation.nit:1244 */
+  /* ./syntax//icode_generation.nit:1280 */
   fra.me.REG[4] = CALL_icode___icode_base___IRoutine___body(fra.me.REG[5])(fra.me.REG[5]);
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4]);
-  /* ./syntax//icode_generation.nit:1245 */
+  /* ./syntax//icode_generation.nit:1281 */
   fra.me.REG[4] = CALL_syntax___typing___AClosureDef___escapable(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[6] = CALL_icode___icode_base___IRoutine___body(fra.me.REG[5])(fra.me.REG[5]);
   REGB0 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
-    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1245);
+    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1281);
   }
   CALL_syntax___icode_generation___EscapableBlock___continue_seq__eq(fra.me.REG[4])(fra.me.REG[4], fra.me.REG[6]);
-  /* ./syntax//icode_generation.nit:1246 */
+  /* ./syntax//icode_generation.nit:1282 */
   fra.me.REG[6] = CALL_syntax___typing___AClosureDef___escapable(fra.me.REG[2])(fra.me.REG[2]);
   fra.me.REG[4] = CALL_icode___icode_base___IRoutine___result(fra.me.REG[5])(fra.me.REG[5]);
   REGB0 = TAG_Bool(fra.me.REG[6]==NIT_NULL);
   if (UNTAG_Bool(REGB0)) {
-    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1246);
+    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1282);
   }
   CALL_syntax___icode_generation___EscapableBlock___continue_value__eq(fra.me.REG[6])(fra.me.REG[6], fra.me.REG[4]);
-  /* ./syntax//icode_generation.nit:1249 */
+  /* ./syntax//icode_generation.nit:1285 */
   REGB0 = TAG_Int(0);
   fra.me.REG[4] = CALL_syntax___syntax_base___AClosureDef___variables(fra.me.REG[2])(fra.me.REG[2]);
   REGB1 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
   if (UNTAG_Bool(REGB1)) {
-    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1249);
+    nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1285);
   }
-  /* ./../lib/standard//collection//array.nit:23 */
+  /* ./../lib/standard//collection//array.nit:24 */
   REGB1 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[4])!=NIT_NULL);
   if (UNTAG_Bool(REGB1)) {
   } else {
-    nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 23);
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 24);
   }
   REGB1 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[4]);
-  /* ./../lib/standard//kernel.nit:335 */
+  /* ./../lib/standard//kernel.nit:352 */
   while(1) {
     REGB2 = TAG_Bool(VAL_ISA(REGB1, VTCOLOR_standard___kernel___Comparable___OTHER(REGB0), VTID_standard___kernel___Comparable___OTHER(REGB0))) /*cast OTHER*/;
     if (UNTAG_Bool(REGB2)) {
     } else {
       nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
     }
-    /* ./../lib/standard//kernel.nit:215 */
+    /* ./../lib/standard//kernel.nit:232 */
     REGB2 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB1));
-    /* ./../lib/standard//kernel.nit:335 */
+    /* ./../lib/standard//kernel.nit:352 */
     if (UNTAG_Bool(REGB2)) {
-      /* ./syntax//icode_generation.nit:1249 */
+      /* ./syntax//icode_generation.nit:1285 */
       REGB2 = REGB0;
-      /* ./syntax//icode_generation.nit:1250 */
+      /* ./syntax//icode_generation.nit:1286 */
       fra.me.REG[4] = CALL_syntax___syntax_base___AClosureDef___variables(fra.me.REG[2])(fra.me.REG[2]);
       REGB3 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
       if (UNTAG_Bool(REGB3)) {
-        nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1250);
+        nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1286);
       }
-      /* ./../lib/standard//collection//array.nit:241 */
+      /* ./../lib/standard//collection//array.nit:278 */
       REGB3 = REGB2;
-      /* ./../lib/standard//collection//array.nit:243 */
+      /* ./../lib/standard//collection//array.nit:280 */
       REGB4 = TAG_Int(0);
       REGB5 = TAG_Bool(VAL_ISA(REGB4, VTCOLOR_standard___kernel___Comparable___OTHER(REGB3), VTID_standard___kernel___Comparable___OTHER(REGB3))) /*cast OTHER*/;
       if (UNTAG_Bool(REGB5)) {
       } else {
         nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
       }
-      /* ./../lib/standard//kernel.nit:216 */
+      /* ./../lib/standard//kernel.nit:233 */
       REGB4 = TAG_Bool(UNTAG_Int(REGB3)>=UNTAG_Int(REGB4));
-      /* ./../lib/standard//collection//array.nit:243 */
+      /* ./../lib/standard//collection//array.nit:280 */
       if (UNTAG_Bool(REGB4)) {
         REGB4 = TAG_Bool(ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[4])!=NIT_NULL);
         if (UNTAG_Bool(REGB4)) {
         } else {
-          nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 243);
+          nit_abort("Uninitialized attribute %s", "_length", LOCATE_standard___collection___array, 280);
         }
         REGB4 = ATTR_standard___collection___array___AbstractArrayRead____length(fra.me.REG[4]);
         REGB5 = TAG_Bool(VAL_ISA(REGB4, VTCOLOR_standard___kernel___Comparable___OTHER(REGB3), VTID_standard___kernel___Comparable___OTHER(REGB3))) /*cast OTHER*/;
@@ -6266,57 +6547,57 @@ val_t syntax___icode_generation___AClosureDef___generate_iclosuredef(val_t p0, v
         } else {
           nit_abort("Cast failed", NULL, LOCATE_standard___kernel, 0);
         }
-        /* ./../lib/standard//kernel.nit:215 */
+        /* ./../lib/standard//kernel.nit:232 */
         REGB4 = TAG_Bool(UNTAG_Int(REGB3)<UNTAG_Int(REGB4));
       } else {
-        /* ./../lib/standard//collection//array.nit:243 */
+        /* ./../lib/standard//collection//array.nit:280 */
         REGB5 = TAG_Bool(false);
         REGB4 = REGB5;
       }
       if (UNTAG_Bool(REGB4)) {
       } else {
-        nit_abort("Assert %s  failed", "'index'", LOCATE_standard___collection___array, 243);
+        nit_abort("Assert %s  failed", "'index'", LOCATE_standard___collection___array, 280);
       }
-      /* ./../lib/standard//collection//array.nit:244 */
+      /* ./../lib/standard//collection//array.nit:281 */
       fra.me.REG[4] = ATTR_standard___collection___array___Array____items(fra.me.REG[4]);
       REGB4 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
       if (UNTAG_Bool(REGB4)) {
-        nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 244);
+        nit_abort("Reciever is null", NULL, LOCATE_standard___collection___array, 281);
       }
-      /* ./../lib/standard//collection//array.nit:652 */
+      /* ./../lib/standard//collection//array.nit:718 */
       fra.me.REG[4] = ((Nit_NativeArray)fra.me.REG[4])->val[UNTAG_Int(REGB3)];
-      /* ./../lib/standard//collection//array.nit:244 */
+      /* ./../lib/standard//collection//array.nit:281 */
       goto label2;
       label2: while(0);
-      /* ./syntax//icode_generation.nit:1250 */
+      /* ./syntax//icode_generation.nit:1286 */
       fra.me.REG[4] = CALL_syntax___icode_generation___A2IContext___variable(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4]);
-      /* ./syntax//icode_generation.nit:1251 */
+      /* ./syntax//icode_generation.nit:1287 */
       fra.me.REG[6] = CALL_icode___icode_base___IRoutine___params(fra.me.REG[5])(fra.me.REG[5]);
       fra.me.REG[6] = CALL_standard___collection___abstract_collection___SequenceRead_____bra(fra.me.REG[6])(fra.me.REG[6], REGB2);
       CALL_icode___icode_builder___ICodeBuilder___add_assignment(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4], fra.me.REG[6]);
-      /* ./../lib/standard//kernel.nit:337 */
+      /* ./../lib/standard//kernel.nit:354 */
       REGB2 = TAG_Int(1);
-      /* ./../lib/standard//kernel.nit:218 */
+      /* ./../lib/standard//kernel.nit:235 */
       REGB2 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB2));
-      /* ./../lib/standard//kernel.nit:337 */
+      /* ./../lib/standard//kernel.nit:354 */
       REGB0 = REGB2;
     } else {
-      /* ./../lib/standard//kernel.nit:335 */
+      /* ./../lib/standard//kernel.nit:352 */
       goto label3;
     }
   }
   label3: while(0);
-  /* ./syntax//icode_generation.nit:1254 */
+  /* ./syntax//icode_generation.nit:1290 */
   fra.me.REG[6] = CALL_parser___parser_nodes___AClosureDef___n_expr(fra.me.REG[2])(fra.me.REG[2]);
   CALL_syntax___icode_generation___A2IContext___generate_stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[6]);
-  /* ./syntax//icode_generation.nit:1257 */
+  /* ./syntax//icode_generation.nit:1293 */
   fra.me.REG[6] = CALL_syntax___syntax_base___AClosureDef___closure(fra.me.REG[2])(fra.me.REG[2]);
   REGB0 = CALL_metamodel___static_type___MMClosure___is_break(fra.me.REG[6])(fra.me.REG[6]);
   if (UNTAG_Bool(REGB0)) {
     fra.me.REG[6] = CALL_syntax___typing___AClosureDef___escapable(fra.me.REG[2])(fra.me.REG[2]);
     REGB0 = TAG_Bool(fra.me.REG[6]==NIT_NULL);
     if (UNTAG_Bool(REGB0)) {
-      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1257);
+      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1293);
     }
     fra.me.REG[6] = CALL_syntax___icode_generation___EscapableBlock___break_value(fra.me.REG[6])(fra.me.REG[6]);
     REGB0 = TAG_Bool(fra.me.REG[6]==NIT_NULL);
@@ -6336,25 +6617,25 @@ val_t syntax___icode_generation___AClosureDef___generate_iclosuredef(val_t p0, v
     REGB0 = REGB1;
   }
   if (UNTAG_Bool(REGB0)) {
-    /* ./syntax//icode_generation.nit:1258 */
+    /* ./syntax//icode_generation.nit:1294 */
     fra.me.REG[6] = CALL_syntax___typing___AClosureDef___escapable(fra.me.REG[2])(fra.me.REG[2]);
     REGB0 = TAG_Bool(fra.me.REG[6]==NIT_NULL);
     if (UNTAG_Bool(REGB0)) {
-      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1258);
+      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1294);
     }
     fra.me.REG[6] = CALL_syntax___icode_generation___EscapableBlock___break_seq(fra.me.REG[6])(fra.me.REG[6]);
     REGB0 = TAG_Bool(fra.me.REG[6]!=NIT_NULL);
     if (UNTAG_Bool(REGB0)) {
     } else {
-      nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 1258);
+      nit_abort("Cast failed", NULL, LOCATE_syntax___icode_generation, 1294);
     }
     CALL_icode___icode_builder___ICodeBuilder___add_escape(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[6]);
   }
-  /* ./syntax//icode_generation.nit:1261 */
+  /* ./syntax//icode_generation.nit:1297 */
   CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:1262 */
+  /* ./syntax//icode_generation.nit:1298 */
   ATTR_syntax___icode_generation___AClosureDef____iclosure_def(fra.me.REG[2]) = fra.me.REG[5];
-  /* ./syntax//icode_generation.nit:1263 */
+  /* ./syntax//icode_generation.nit:1299 */
   goto label4;
   label4: while(0);
   stack_frame_head = fra.me.prev;
@@ -6368,10 +6649,11 @@ val_t syntax___icode_generation___AClosureCallExpr___generate_icode(val_t p0, va
   val_t tmp;
   fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
   fra.me.file = LOCATE_syntax___icode_generation;
-  fra.me.line = 1268;
+  fra.me.line = 1304;
   fra.me.meth = LOCATE_syntax___icode_generation___AClosureCallExpr___generate_icode;
   fra.me.has_broke = 0;
   fra.me.REG_size = 9;
+  fra.me.nitni_local_ref_head = NULL;
   fra.me.REG[0] = NIT_NULL;
   fra.me.REG[1] = NIT_NULL;
   fra.me.REG[2] = NIT_NULL;
@@ -6383,57 +6665,57 @@ val_t syntax___icode_generation___AClosureCallExpr___generate_icode(val_t p0, va
   fra.me.REG[8] = NIT_NULL;
   fra.me.REG[0] = p0;
   fra.me.REG[1] = p1;
-  /* ./syntax//icode_generation.nit:1271 */
+  /* ./syntax//icode_generation.nit:1307 */
   fra.me.REG[2] = NEW_Array_standard___collection___array___Array___init();
-  /* ./syntax//icode_generation.nit:1272 */
+  /* ./syntax//icode_generation.nit:1308 */
   fra.me.REG[3] = CALL_syntax___syntax_base___AClosureCallExpr___variable(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[3] = CALL_syntax___syntax_base___ClosureVariable___closure(fra.me.REG[3])(fra.me.REG[3]);
   fra.me.REG[3] = CALL_metamodel___static_type___MMClosure___signature(fra.me.REG[3])(fra.me.REG[3]);
   CALL_syntax___icode_generation___AAbsAbsSendExpr___generate_icode_for_arguments_in(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1], fra.me.REG[2], fra.me.REG[3]);
-  /* ./syntax//icode_generation.nit:1275 */
+  /* ./syntax//icode_generation.nit:1311 */
   fra.me.REG[3] = CALL_syntax___icode_generation___A2IContext___closurevariables(fra.me.REG[1])(fra.me.REG[1]);
   fra.me.REG[4] = CALL_syntax___syntax_base___AClosureCallExpr___variable(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[4] = CALL_standard___collection___abstract_collection___MapRead_____bra(fra.me.REG[3])(fra.me.REG[3], fra.me.REG[4]);
-  /* ./syntax//icode_generation.nit:1276 */
+  /* ./syntax//icode_generation.nit:1312 */
   fra.me.REG[3] = NEW_IClosCall_icode___icode_base___IClosCall___init(fra.me.REG[4], fra.me.REG[2]);
-  /* ./syntax//icode_generation.nit:1277 */
+  /* ./syntax//icode_generation.nit:1313 */
   fra.me.REG[5] = CALL_icode___icode_builder___ICodeBuilder___seq(fra.me.REG[1])(fra.me.REG[1]);
-  /* ./syntax//icode_generation.nit:1280 */
+  /* ./syntax//icode_generation.nit:1316 */
   fra.me.REG[6] = CALL_parser___parser_nodes___AClosureCallExpr___n_closure_defs(fra.me.REG[0])(fra.me.REG[0]);
   REGB0 = CALL_standard___collection___abstract_collection___Collection___length(fra.me.REG[6])(fra.me.REG[6]);
   REGB1 = TAG_Int(1);
   REGB2 = TAG_Bool(IS_EQUAL_OO(REGB0,REGB1));
   if (UNTAG_Bool(REGB2)) {
   } else {
-    /* ./../lib/standard//kernel.nit:210 */
+    /* ./../lib/standard//kernel.nit:227 */
     REGB1 = TAG_Bool((REGB0)==(REGB1));
-    /* ./syntax//icode_generation.nit:1280 */
+    /* ./syntax//icode_generation.nit:1316 */
     REGB2 = REGB1;
   }
   if (UNTAG_Bool(REGB2)) {
-    /* ./syntax//icode_generation.nit:1281 */
+    /* ./syntax//icode_generation.nit:1317 */
     fra.me.REG[6] = NEW_ISeq_icode___icode_base___ISeq___init();
-    /* ./syntax//icode_generation.nit:1282 */
+    /* ./syntax//icode_generation.nit:1318 */
     CALL_icode___icode_base___IClosCall___break_seq__eq(fra.me.REG[3])(fra.me.REG[3], fra.me.REG[6]);
-    /* ./syntax//icode_generation.nit:1283 */
+    /* ./syntax//icode_generation.nit:1319 */
     CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[6]);
-    /* ./syntax//icode_generation.nit:1284 */
+    /* ./syntax//icode_generation.nit:1320 */
     fra.me.REG[6] = CALL_parser___parser_nodes___AClosureCallExpr___n_closure_defs(fra.me.REG[0])(fra.me.REG[0]);
     fra.me.REG[6] = CALL_standard___collection___abstract_collection___Collection___first(fra.me.REG[6])(fra.me.REG[6]);
     REGB2 = TAG_Bool(fra.me.REG[6]==NIT_NULL);
     if (UNTAG_Bool(REGB2)) {
-      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1284);
+      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1320);
     }
     fra.me.REG[6] = CALL_parser___parser_nodes___AClosureDef___n_expr(fra.me.REG[6])(fra.me.REG[6]);
     CALL_syntax___icode_generation___A2IContext___generate_stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[6]);
-    /* ./syntax//icode_generation.nit:1285 */
+    /* ./syntax//icode_generation.nit:1321 */
     CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[5]);
   }
-  /* ./syntax//icode_generation.nit:1289 */
+  /* ./syntax//icode_generation.nit:1325 */
   fra.me.REG[6] = NIT_NULL;
-  /* ./syntax//icode_generation.nit:1290 */
+  /* ./syntax//icode_generation.nit:1326 */
   fra.me.REG[7] = CALL_icode___icode_base___IClosureDecl___default(fra.me.REG[4])(fra.me.REG[4]);
-  /* ./syntax//icode_generation.nit:1291 */
+  /* ./syntax//icode_generation.nit:1327 */
   REGB2 = TAG_Bool(fra.me.REG[7]==NIT_NULL);
   if (UNTAG_Bool(REGB2)) {
   } else {
@@ -6448,31 +6730,31 @@ val_t syntax___icode_generation___AClosureCallExpr___generate_icode(val_t p0, va
   }
   REGB2 = TAG_Bool(!UNTAG_Bool(REGB2));
   if (UNTAG_Bool(REGB2)) {
-    /* ./syntax//icode_generation.nit:1292 */
+    /* ./syntax//icode_generation.nit:1328 */
     fra.me.REG[4] = NEW_IHasClos_icode___icode_base___IHasClos___init(fra.me.REG[4]);
     fra.me.REG[8] = CALL_syntax___icode_generation___A2IContext___visitor(fra.me.REG[1])(fra.me.REG[1]);
     fra.me.REG[8] = CALL_syntax___syntax_base___AbsSyntaxVisitor___type_bool(fra.me.REG[8])(fra.me.REG[8]);
     fra.me.REG[8] = CALL_icode___icode_builder___ICodeBuilder___expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[4], fra.me.REG[8]);
     fra.me.REG[8] = NEW_IIf_icode___icode_base___IIf___init(fra.me.REG[8]);
     fra.me.REG[6] = fra.me.REG[8];
-    /* ./syntax//icode_generation.nit:1293 */
+    /* ./syntax//icode_generation.nit:1329 */
     CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[6]);
-    /* ./syntax//icode_generation.nit:1294 */
+    /* ./syntax//icode_generation.nit:1330 */
     REGB2 = TAG_Bool(fra.me.REG[6]==NIT_NULL);
     if (UNTAG_Bool(REGB2)) {
-      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1294);
+      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1330);
     }
     fra.me.REG[8] = CALL_icode___icode_base___IIf___then_seq(fra.me.REG[6])(fra.me.REG[6]);
     CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[8]);
   }
-  /* ./syntax//icode_generation.nit:1298 */
+  /* ./syntax//icode_generation.nit:1334 */
   fra.me.REG[8] = NIT_NULL;
-  /* ./syntax//icode_generation.nit:1299 */
+  /* ./syntax//icode_generation.nit:1335 */
   fra.me.REG[0] = CALL_syntax___syntax_base___AClosureCallExpr___variable(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[0] = CALL_syntax___syntax_base___ClosureVariable___closure(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[0] = CALL_metamodel___static_type___MMClosure___signature(fra.me.REG[0])(fra.me.REG[0]);
   fra.me.REG[0] = CALL_metamodel___static_type___MMSignature___return_type(fra.me.REG[0])(fra.me.REG[0]);
-  /* ./syntax//icode_generation.nit:1300 */
+  /* ./syntax//icode_generation.nit:1336 */
   REGB2 = TAG_Bool(fra.me.REG[0]==NIT_NULL);
   if (UNTAG_Bool(REGB2)) {
   } else {
@@ -6486,16 +6768,16 @@ val_t syntax___icode_generation___AClosureCallExpr___generate_icode(val_t p0, va
     }
   }
   if (UNTAG_Bool(REGB2)) {
-    /* ./syntax//icode_generation.nit:1301 */
+    /* ./syntax//icode_generation.nit:1337 */
     CALL_icode___icode_builder___ICodeBuilder___stmt(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3]);
   } else {
-    /* ./syntax//icode_generation.nit:1303 */
+    /* ./syntax//icode_generation.nit:1339 */
     fra.me.REG[3] = CALL_icode___icode_builder___ICodeBuilder___expr(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3], fra.me.REG[0]);
     fra.me.REG[8] = fra.me.REG[3];
   }
-  /* ./syntax//icode_generation.nit:1307 */
+  /* ./syntax//icode_generation.nit:1343 */
   fra.me.REG[3] = NIT_NULL;
-  /* ./syntax//icode_generation.nit:1308 */
+  /* ./syntax//icode_generation.nit:1344 */
   REGB2 = TAG_Bool(fra.me.REG[7]==NIT_NULL);
   if (UNTAG_Bool(REGB2)) {
   } else {
@@ -6510,7 +6792,7 @@ val_t syntax___icode_generation___AClosureCallExpr___generate_icode(val_t p0, va
   }
   REGB2 = TAG_Bool(!UNTAG_Bool(REGB2));
   if (UNTAG_Bool(REGB2)) {
-    /* ./syntax//icode_generation.nit:1309 */
+    /* ./syntax//icode_generation.nit:1345 */
     REGB2 = TAG_Bool(fra.me.REG[6]==NIT_NULL);
     if (UNTAG_Bool(REGB2)) {
     } else {
@@ -6526,9 +6808,9 @@ val_t syntax___icode_generation___AClosureCallExpr___generate_icode(val_t p0, va
     REGB2 = TAG_Bool(!UNTAG_Bool(REGB2));
     if (UNTAG_Bool(REGB2)) {
     } else {
-      nit_abort("Assert failed", NULL, LOCATE_syntax___icode_generation, 1309);
+      nit_abort("Assert failed", NULL, LOCATE_syntax___icode_generation, 1345);
     }
-    /* ./syntax//icode_generation.nit:1310 */
+    /* ./syntax//icode_generation.nit:1346 */
     REGB2 = TAG_Bool(fra.me.REG[8]==NIT_NULL);
     if (UNTAG_Bool(REGB2)) {
     } else {
@@ -6543,7 +6825,7 @@ val_t syntax___icode_generation___AClosureCallExpr___generate_icode(val_t p0, va
     }
     REGB2 = TAG_Bool(!UNTAG_Bool(REGB2));
     if (UNTAG_Bool(REGB2)) {
-      /* ./syntax//icode_generation.nit:1311 */
+      /* ./syntax//icode_generation.nit:1347 */
       REGB2 = TAG_Bool(fra.me.REG[0]==NIT_NULL);
       if (UNTAG_Bool(REGB2)) {
       } else {
@@ -6559,24 +6841,24 @@ val_t syntax___icode_generation___AClosureCallExpr___generate_icode(val_t p0, va
       REGB2 = TAG_Bool(!UNTAG_Bool(REGB2));
       if (UNTAG_Bool(REGB2)) {
       } else {
-        nit_abort("Assert failed", NULL, LOCATE_syntax___icode_generation, 1311);
+        nit_abort("Assert failed", NULL, LOCATE_syntax___icode_generation, 1347);
       }
-      /* ./syntax//icode_generation.nit:1312 */
+      /* ./syntax//icode_generation.nit:1348 */
       fra.me.REG[0] = CALL_icode___icode_builder___ICodeBuilder___new_register(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
       fra.me.REG[3] = fra.me.REG[0];
-      /* ./syntax//icode_generation.nit:1313 */
+      /* ./syntax//icode_generation.nit:1349 */
       CALL_icode___icode_builder___ICodeBuilder___add_assignment(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3], fra.me.REG[8]);
     }
-    /* ./syntax//icode_generation.nit:1315 */
+    /* ./syntax//icode_generation.nit:1351 */
     REGB2 = TAG_Bool(fra.me.REG[6]==NIT_NULL);
     if (UNTAG_Bool(REGB2)) {
-      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1315);
+      nit_abort("Reciever is null", NULL, LOCATE_syntax___icode_generation, 1351);
     }
     fra.me.REG[6] = CALL_icode___icode_base___IIf___else_seq(fra.me.REG[6])(fra.me.REG[6]);
     CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[6]);
-    /* ./syntax//icode_generation.nit:1316 */
+    /* ./syntax//icode_generation.nit:1352 */
     fra.me.REG[2] = CALL_icode___icode_tools___ICodeBuilder___inline_routine(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[7], fra.me.REG[2], NIT_NULL);
-    /* ./syntax//icode_generation.nit:1317 */
+    /* ./syntax//icode_generation.nit:1353 */
     REGB2 = TAG_Bool(fra.me.REG[3]==NIT_NULL);
     if (UNTAG_Bool(REGB2)) {
     } else {
@@ -6591,7 +6873,7 @@ val_t syntax___icode_generation___AClosureCallExpr___generate_icode(val_t p0, va
     }
     REGB2 = TAG_Bool(!UNTAG_Bool(REGB2));
     if (UNTAG_Bool(REGB2)) {
-      /* ./syntax//icode_generation.nit:1318 */
+      /* ./syntax//icode_generation.nit:1354 */
       REGB2 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
       if (UNTAG_Bool(REGB2)) {
       } else {
@@ -6607,18 +6889,18 @@ val_t syntax___icode_generation___AClosureCallExpr___generate_icode(val_t p0, va
       REGB2 = TAG_Bool(!UNTAG_Bool(REGB2));
       if (UNTAG_Bool(REGB2)) {
       } else {
-        nit_abort("Assert failed", NULL, LOCATE_syntax___icode_generation, 1318);
+        nit_abort("Assert failed", NULL, LOCATE_syntax___icode_generation, 1354);
       }
-      /* ./syntax//icode_generation.nit:1319 */
+      /* ./syntax//icode_generation.nit:1355 */
       CALL_icode___icode_builder___ICodeBuilder___add_assignment(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[3], fra.me.REG[2]);
     }
-    /* ./syntax//icode_generation.nit:1321 */
+    /* ./syntax//icode_generation.nit:1357 */
     CALL_icode___icode_builder___ICodeBuilder___seq__eq(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[5]);
   } else {
-    /* ./syntax//icode_generation.nit:1323 */
+    /* ./syntax//icode_generation.nit:1359 */
     fra.me.REG[3] = fra.me.REG[8];
   }
-  /* ./syntax//icode_generation.nit:1325 */
+  /* ./syntax//icode_generation.nit:1361 */
   goto label1;
   label1: while(0);
   stack_frame_head = fra.me.prev;