update NOTICE and LICENSE

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

diff --git a/c_src/string._sep.c b/c_src/string._sep.c
index a7ce642..095c6a0 100644 (file)
--- a/c_src/string._sep.c
+++ b/c_src/string._sep.c
@@ -1,1388 +1,3351 @@
 /* This C file is generated by NIT to compile module string. */
 #include "string._sep.h"
-val_t string___String_____bra(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 31, LOCATE_string___String_____bra};
-  val_t variable0;
-  val_t variable1;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  variable1 = ATTR_string___String____items( self) /*String::_items*/;
-  variable1 = TAG_Char(UNBOX_NativeString(variable1)[UNTAG_Int( variable0 /*index*/)]);
-  goto return_label0;
-  return_label0: while(false);
-  tracehead = trace.prev;
-  return variable1;
+val_t string___AbstractString___items(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 26;
+  fra.me.meth = LOCATE_string___AbstractString___items;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//string.nit:26 */
+  REGB0 = TAG_Bool(ATTR_string___AbstractString____items(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_items", LOCATE_string, 26);
+  }
+  fra.me.REG[0] = ATTR_string___AbstractString____items(fra.me.REG[0]);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
 }
-void string___String_____braeq(val_t  self, val_t  param0, val_t  param1) {
-  struct trace_t trace = {NULL, NULL, 33, LOCATE_string___String_____braeq};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-  val_t variable3;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  variable1 =  param1;
-  variable2 = ((array___AbstractArray___length_t)CALL( self,COLOR_abstract_collection___Collection___length))( self) /*AbstractArray::length*/;
-  variable2 = TAG_Bool(( variable0 /*index*/)==(variable2));
-  if (UNTAG_Bool(variable2)) { /*if*/
-    ((string___String___add_t)CALL( self,COLOR_abstract_collection___SimpleCollection___add))( self,  variable1 /*item*/) /*String::add*/;
-    goto return_label1;
-  }
-  variable2 = TAG_Bool(UNTAG_Int( variable0 /*index*/)>=UNTAG_Int( TAG_Int(0)));
-  variable3 = variable2;
-  if (UNTAG_Bool(variable3)) { /* and */
-    variable3 = ((array___AbstractArray___length_t)CALL( self,COLOR_abstract_collection___Collection___length))( self) /*AbstractArray::length*/;
-    variable3 = TAG_Bool(UNTAG_Int( variable0 /*index*/)<UNTAG_Int(variable3));
-  }
-  variable2 = variable3;
-  if (!UNTAG_Bool(variable2)) { fprintf(stderr, "Assert%s failed", ""); fprintf(stderr, " in %s (%s:%d)\n", LOCATE_string___String_____braeq, LOCATE_string, 39); nit_exit(1);}
-  variable2 = ATTR_string___String____items( self) /*String::_items*/;
-  UNBOX_NativeString(variable2)[UNTAG_Int( variable0 /*index*/)]=UNTAG_Char( variable1 /*item*/);
-  return_label1: while(false);
-  tracehead = trace.prev;
-  return;
+val_t string___AbstractString_____bra(val_t p0, val_t p1){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 28;
+  fra.me.meth = LOCATE_string___AbstractString_____bra;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  REGB0 = p1;
+  /* ./../lib/standard//string.nit:28 */
+  REGB1 = TAG_Bool(ATTR_string___AbstractString____items(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_items", LOCATE_string, 28);
+  }
+  fra.me.REG[0] = ATTR_string___AbstractString____items(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:585 */
+  REGB0 = TAG_Char(UNBOX_NativeString(fra.me.REG[0])[UNTAG_Int(REGB0)]);
+  /* ./../lib/standard//string.nit:28 */
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
 }
-void string___String___add(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 43, LOCATE_string___String___add};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  variable1 = ATTR_string___String____capacity( self) /*String::_capacity*/;
-  variable2 = ((array___AbstractArray___length_t)CALL( self,COLOR_abstract_collection___Collection___length))( self) /*AbstractArray::length*/;
-  variable1 = TAG_Bool(UNTAG_Int(variable1)<=UNTAG_Int(variable2));
-  if (UNTAG_Bool(variable1)) { /*if*/
-    variable1 = ((array___AbstractArray___length_t)CALL( self,COLOR_abstract_collection___Collection___length))( self) /*AbstractArray::length*/;
-    variable1 = TAG_Int(UNTAG_Int(variable1)+UNTAG_Int( TAG_Int(5)));
-    ((string___String___enlarge_t)CALL( self,COLOR_array___AbstractArray___enlarge))( self, variable1) /*String::enlarge*/;
-  }
-  variable1 = ATTR_string___String____items( self) /*String::_items*/;
-  variable2 = ((array___AbstractArray___length_t)CALL( self,COLOR_abstract_collection___Collection___length))( self) /*AbstractArray::length*/;
-  UNBOX_NativeString(variable1)[UNTAG_Int(variable2)]=UNTAG_Char( variable0 /*c*/);
-  ATTR_array___AbstractArray____length( self) /*AbstractArray::_length*/ = TAG_Int(UNTAG_Int(ATTR_array___AbstractArray____length( self) /*AbstractArray::_length*/)+UNTAG_Int( TAG_Int(1)));
-  tracehead = trace.prev;
-  return;
+val_t string___AbstractString___substring(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 REGB1;
+  val_t REGB2;
+  val_t tmp;
+    static val_t once_value_3; /* Once value */
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 30;
+  fra.me.meth = LOCATE_string___AbstractString___substring;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 3;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  REGB0 = p1;
+  REGB1 = p2;
+  /* ./../lib/standard//string.nit:38 */
+  REGB2 = TAG_Int(0);
+  /* ./../lib/standard//kernel.nit:213 */
+  REGB2 = TAG_Bool(UNTAG_Int(REGB1)>=UNTAG_Int(REGB2));
+  /* ./../lib/standard//string.nit:38 */
+  if (UNTAG_Bool(REGB2)) {
+  } else {
+    nit_abort("Assert failed", NULL, LOCATE_string, 38);
+  }
+  /* ./../lib/standard//kernel.nit:215 */
+  REGB2 = TAG_Int(UNTAG_Int(REGB1)+UNTAG_Int(REGB0));
+  /* ./../lib/standard//string.nit:39 */
+  REGB1 = REGB2;
+  /* ./../lib/standard//string.nit:40 */
+  REGB2 = TAG_Int(0);
+  /* ./../lib/standard//kernel.nit:212 */
+  REGB2 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB2));
+  /* ./../lib/standard//string.nit:40 */
+  if (UNTAG_Bool(REGB2)) {
+    REGB2 = TAG_Int(0);
+    REGB0 = REGB2;
+  }
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB2 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB2)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB2 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+  /* ./../lib/standard//kernel.nit:214 */
+  REGB2 = TAG_Bool(UNTAG_Int(REGB1)>UNTAG_Int(REGB2));
+  /* ./../lib/standard//string.nit:41 */
+  if (UNTAG_Bool(REGB2)) {
+    /* ./../lib/standard//collection//array.nit:23 */
+    REGB2 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+    if (UNTAG_Bool(REGB2)) {
+    } else {
+      nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+    }
+    REGB2 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+    /* ./../lib/standard//string.nit:41 */
+    REGB1 = REGB2;
+  }
+  /* ./../lib/standard//kernel.nit:212 */
+  REGB2 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB1));
+  /* ./../lib/standard//string.nit:42 */
+  if (UNTAG_Bool(REGB2)) {
+    /* ./../lib/standard//kernel.nit:217 */
+    REGB2 = TAG_Int(UNTAG_Int(REGB1)-UNTAG_Int(REGB0));
+    /* ./../lib/standard//string.nit:43 */
+    fra.me.REG[1] = NEW_Buffer_string___Buffer___with_capacity(REGB2);
+    /* ./../lib/standard//string.nit:44 */
+    while(1) {
+      /* ./../lib/standard//kernel.nit:212 */
+      REGB2 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB1));
+      /* ./../lib/standard//string.nit:44 */
+      if (UNTAG_Bool(REGB2)) {
+        /* ./../lib/standard//string.nit:45 */
+        REGB2 = TAG_Bool(ATTR_string___AbstractString____items(fra.me.REG[0])!=NIT_NULL);
+        if (UNTAG_Bool(REGB2)) {
+        } else {
+          nit_abort("Uninitialized attribute %s", "_items", LOCATE_string, 45);
+        }
+        fra.me.REG[2] = ATTR_string___AbstractString____items(fra.me.REG[0]);
+        /* ./../lib/standard//string.nit:585 */
+        REGB2 = TAG_Char(UNBOX_NativeString(fra.me.REG[2])[UNTAG_Int(REGB0)]);
+        /* ./../lib/standard//string.nit:45 */
+        CALL_abstract_collection___Sequence___push(fra.me.REG[1])(fra.me.REG[1], REGB2);
+        /* ./../lib/standard//string.nit:46 */
+        REGB2 = TAG_Int(1);
+        /* ./../lib/standard//kernel.nit:215 */
+        REGB2 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB2));
+        /* ./../lib/standard//string.nit:46 */
+        REGB0 = REGB2;
+      } else {
+        /* ./../lib/standard//string.nit:44 */
+        goto label1;
+      }
+    }
+    label1: while(0);
+    /* ./../lib/standard//string.nit:48 */
+    fra.me.REG[1] = CALL_string___Object___to_s(fra.me.REG[1])(fra.me.REG[1]);
+    goto label2;
+  } else {
+    /* ./../lib/standard//string.nit:50 */
+    if (!once_value_3) {
+      fra.me.REG[0] = BOX_NativeString("");
+      REGB0 = TAG_Int(0);
+      fra.me.REG[0] = NEW_String_string___String___with_native(fra.me.REG[0], REGB0);
+      once_value_3 = fra.me.REG[0];
+      register_static_object(&once_value_3);
+    } else fra.me.REG[0] = once_value_3;
+    fra.me.REG[0] = fra.me.REG[0];
+    fra.me.REG[1] = fra.me.REG[0];
+    goto label2;
+  }
+  label2: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[1];
 }
-void string___String___enlarge(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 50, LOCATE_string___String___enlarge};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-  val_t variable3;
-  val_t variable4;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  variable2 = ATTR_string___String____capacity( self) /*String::_capacity*/;
-  variable1 = variable2;
-  variable2 = TAG_Bool(UNTAG_Int( variable0 /*cap*/)<=UNTAG_Int( variable1 /*c*/));
-  if (UNTAG_Bool(variable2)) { /*if*/
-    goto return_label3;
-  }
-  while (true) { /*while*/
-    variable2 = TAG_Bool(UNTAG_Int( variable1 /*c*/)<=UNTAG_Int( variable0 /*cap*/));
-    if (!UNTAG_Bool(variable2)) break; /* while*/
-    variable2 = TAG_Int(UNTAG_Int( variable1 /*c*/)*UNTAG_Int( TAG_Int(2)));
-    variable2 = TAG_Int(UNTAG_Int(variable2)+UNTAG_Int( TAG_Int(2)));
-    variable1 = variable2 /*c=*/;
-    continue_4: while(0);
-  }
-  break_4: while(0);
-  variable3 = BOX_NativeString((char*)malloc((UNTAG_Int( variable1 /*c*/) * sizeof(char))));
-  variable2 = variable3;
-  variable3 = ATTR_string___String____items( self) /*String::_items*/;
-  variable4 = ((array___AbstractArray___length_t)CALL( self,COLOR_abstract_collection___Collection___length))( self) /*AbstractArray::length*/;
-  (void)memcpy(UNBOX_NativeString( variable2 /*a*/)+UNTAG_Int( TAG_Int(0)), UNBOX_NativeString(variable3)+UNTAG_Int( TAG_Int(0)), UNTAG_Int(variable4));
-  ATTR_string___String____items( self) /*String::_items*/ =  variable2 /*a*/;
-  ATTR_string___String____capacity( self) /*String::_capacity*/ =  variable1 /*c*/;
-  return_label3: while(false);
-  tracehead = trace.prev;
-  return;
+val_t string___AbstractString___substring_from(val_t p0, val_t p1){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 54;
+  fra.me.meth = LOCATE_string___AbstractString___substring_from;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  REGB0 = p1;
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+  /* ./../lib/standard//kernel.nit:212 */
+  REGB1 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB1));
+  /* ./../lib/standard//string.nit:61 */
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Assert failed", NULL, LOCATE_string, 61);
+  }
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+  /* ./../lib/standard//kernel.nit:217 */
+  REGB1 = TAG_Int(UNTAG_Int(REGB1)-UNTAG_Int(REGB0));
+  /* ./../lib/standard//string.nit:62 */
+  fra.me.REG[0] = CALL_string___AbstractString___substring(fra.me.REG[0])(fra.me.REG[0], REGB0, REGB1);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
 }
-void string___String___append(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 61, LOCATE_string___String___append};
-  val_t variable0;
-  val_t variable1;
-    val_t variable2;
-    val_t variable3;
-    val_t variable4;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  variable1 = TAG_Bool(( variable0 /*s*/==NIT_NULL) || VAL_ISA( variable0 /*s*/, COLOR_String, ID_String)) /*cast String*/;
-  if (UNTAG_Bool(variable1)) { /*if*/
-    variable2 = ((array___AbstractArray___length_t)CALL( variable0 /*s*/,COLOR_abstract_collection___Collection___length))( variable0 /*s*/) /*AbstractArray::length*/;
-    variable1 = variable2;
-    variable2 = ATTR_string___String____capacity( self) /*String::_capacity*/;
-    variable3 = ((array___AbstractArray___length_t)CALL( self,COLOR_abstract_collection___Collection___length))( self) /*AbstractArray::length*/;
-    variable3 = TAG_Int(UNTAG_Int(variable3)+UNTAG_Int( variable1 /*sl*/));
-    variable2 = TAG_Bool(UNTAG_Int(variable2)<UNTAG_Int(variable3));
-    if (UNTAG_Bool(variable2)) { /*if*/
-      variable2 = ((array___AbstractArray___length_t)CALL( self,COLOR_abstract_collection___Collection___length))( self) /*AbstractArray::length*/;
-      variable2 = TAG_Int(UNTAG_Int(variable2)+UNTAG_Int( variable1 /*sl*/));
-      ((string___String___enlarge_t)CALL( self,COLOR_array___AbstractArray___enlarge))( self, variable2) /*String::enlarge*/;
+val_t string___AbstractString___has_substring(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 REGB1;
+  val_t REGB2;
+  val_t REGB3;
+  val_t REGB4;
+  val_t REGB5;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 65;
+  fra.me.meth = LOCATE_string___AbstractString___has_substring;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 3;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  REGB0 = p2;
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[1])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[1]);
+  /* ./../lib/standard//string.nit:71 */
+  REGB2 = TAG_Int(1);
+  /* ./../lib/standard//kernel.nit:217 */
+  REGB2 = TAG_Int(UNTAG_Int(REGB1)-UNTAG_Int(REGB2));
+  /* ./../lib/standard//kernel.nit:215 */
+  REGB0 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB2));
+  /* ./../lib/standard//string.nit:73 */
+  REGB1 = TAG_Bool(ATTR_string___AbstractString____items(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_items", LOCATE_string, 73);
+  }
+  fra.me.REG[2] = ATTR_string___AbstractString____items(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:74 */
+  REGB1 = TAG_Bool(ATTR_string___AbstractString____items(fra.me.REG[1])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_items", LOCATE_string, 74);
+  }
+  fra.me.REG[1] = ATTR_string___AbstractString____items(fra.me.REG[1]);
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+  /* ./../lib/standard//kernel.nit:214 */
+  REGB1 = TAG_Bool(UNTAG_Int(REGB0)>UNTAG_Int(REGB1));
+  /* ./../lib/standard//string.nit:75 */
+  if (UNTAG_Bool(REGB1)) {
+    REGB1 = TAG_Bool(true);
+  } else {
+    /* ./../lib/standard//kernel.nit:214 */
+    REGB3 = TAG_Bool(UNTAG_Int(REGB2)>UNTAG_Int(REGB0));
+    /* ./../lib/standard//string.nit:75 */
+    REGB1 = REGB3;
+  }
+  if (UNTAG_Bool(REGB1)) {
+    REGB1 = TAG_Bool(false);
+    goto label1;
+  }
+  /* ./../lib/standard//string.nit:76 */
+  while(1) {
+    REGB3 = TAG_Int(0);
+    /* ./../lib/standard//kernel.nit:213 */
+    REGB3 = TAG_Bool(UNTAG_Int(REGB2)>=UNTAG_Int(REGB3));
+    /* ./../lib/standard//string.nit:76 */
+    if (UNTAG_Bool(REGB3)) {
+      /* ./../lib/standard//string.nit:585 */
+      REGB3 = TAG_Char(UNBOX_NativeString(fra.me.REG[2])[UNTAG_Int(REGB0)]);
+      REGB4 = TAG_Char(UNBOX_NativeString(fra.me.REG[1])[UNTAG_Int(REGB2)]);
+      /* ./../lib/standard//string.nit:77 */
+      REGB5 = TAG_Bool(IS_EQUAL_OO(REGB3,REGB4));
+      if (UNTAG_Bool(REGB5)) {
+      } else {
+        /* ./../lib/standard//kernel.nit:347 */
+        REGB4 = TAG_Bool((REGB3)==(REGB4));
+        /* ./../lib/standard//string.nit:77 */
+        REGB5 = REGB4;
+      }
+      REGB5 = TAG_Bool(!UNTAG_Bool(REGB5));
+      if (UNTAG_Bool(REGB5)) {
+        REGB5 = TAG_Bool(false);
+        REGB1 = REGB5;
+        goto label1;
+      }
+      /* ./../lib/standard//string.nit:78 */
+      REGB5 = TAG_Int(1);
+      /* ./../lib/standard//kernel.nit:217 */
+      REGB5 = TAG_Int(UNTAG_Int(REGB0)-UNTAG_Int(REGB5));
+      /* ./../lib/standard//string.nit:78 */
+      REGB0 = REGB5;
+      /* ./../lib/standard//string.nit:79 */
+      REGB5 = TAG_Int(1);
+      /* ./../lib/standard//kernel.nit:217 */
+      REGB5 = TAG_Int(UNTAG_Int(REGB2)-UNTAG_Int(REGB5));
+      /* ./../lib/standard//string.nit:79 */
+      REGB2 = REGB5;
+    } else {
+      /* ./../lib/standard//string.nit:76 */
+      goto label2;
     }
-    variable2 = ((string___String___items_t)CALL( variable0 /*s*/,COLOR_string___String___items))( variable0 /*s*/) /*String::items*/;
-    variable3 = ATTR_string___String____items( self) /*String::_items*/;
-    variable4 = ((array___AbstractArray___length_t)CALL( self,COLOR_abstract_collection___Collection___length))( self) /*AbstractArray::length*/;
-    (void)memcpy(UNBOX_NativeString(variable3)+UNTAG_Int(variable4), UNBOX_NativeString(variable2)+UNTAG_Int( TAG_Int(0)), UNTAG_Int( variable1 /*sl*/));
-    ATTR_array___AbstractArray____length( self) /*AbstractArray::_length*/ = TAG_Int(UNTAG_Int(ATTR_array___AbstractArray____length( self) /*AbstractArray::_length*/)+UNTAG_Int( variable1 /*sl*/));
-  } else { /*if*/
-    ((string___String___append_t)CALL( self,COLOR_SUPER_string___String___append))( self,  param0) /*super String::append*/;
-  }
-  tracehead = trace.prev;
-  return;
+  }
+  label2: while(0);
+  /* ./../lib/standard//string.nit:81 */
+  REGB2 = TAG_Bool(true);
+  REGB1 = REGB2;
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB1;
 }
-val_t string___String_____plus(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 73, LOCATE_string___String_____plus};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-  val_t variable3;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  variable2 = ((array___AbstractArray___length_t)CALL( self,COLOR_abstract_collection___Collection___length))( self) /*AbstractArray::length*/;
-  variable3 = ((array___AbstractArray___length_t)CALL( variable0 /*s*/,COLOR_abstract_collection___Collection___length))( variable0 /*s*/) /*AbstractArray::length*/;
-  variable2 = TAG_Int(UNTAG_Int(variable2)+UNTAG_Int(variable3));
-  variable3 = NEW_String_string___String___with_capacity(variable2); /*new String*/
-  variable2 = variable3;
-  variable1 = variable2;
-  ((string___String___append_t)CALL( variable1 /*r*/,COLOR_abstract_collection___IndexedCollection___append))( variable1 /*r*/,  self) /*String::append*/;
-  ((string___String___append_t)CALL( variable1 /*r*/,COLOR_abstract_collection___IndexedCollection___append))( variable1 /*r*/,  variable0 /*s*/) /*String::append*/;
-  variable1 =  variable1 /*r*/;
-  goto return_label6;
-  return_label6: while(false);
-  tracehead = trace.prev;
-  return variable1;
+val_t string___AbstractString___has_prefix(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 84;
+  fra.me.meth = LOCATE_string___AbstractString___has_prefix;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 2;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  /* ./../lib/standard//string.nit:88 */
+  REGB0 = TAG_Int(0);
+  REGB0 = CALL_string___AbstractString___has_substring(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1], REGB0);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
 }
-val_t string___String_____star(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 82, LOCATE_string___String_____star};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-  val_t variable3;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  variable1 = TAG_Bool(UNTAG_Int( variable0 /*i*/)>=UNTAG_Int( TAG_Int(0)));
-  if (!UNTAG_Bool(variable1)) { fprintf(stderr, "Assert%s failed", ""); fprintf(stderr, " in %s (%s:%d)\n", LOCATE_string___String_____star, LOCATE_string, 85); nit_exit(1);}
-  variable2 = ((array___AbstractArray___length_t)CALL( self,COLOR_abstract_collection___Collection___length))( self) /*AbstractArray::length*/;
-  variable2 = TAG_Int(UNTAG_Int(variable2)*UNTAG_Int( variable0 /*i*/));
-  variable3 = NEW_String_string___String___with_capacity(variable2); /*new String*/
-  variable2 = variable3;
-  variable1 = variable2;
-  while (true) { /*while*/
-    variable2 = TAG_Bool(UNTAG_Int( variable0 /*i*/)>UNTAG_Int( TAG_Int(0)));
-    if (!UNTAG_Bool(variable2)) break; /* while*/
-    ((string___String___append_t)CALL( variable1 /*r*/,COLOR_abstract_collection___IndexedCollection___append))( variable1 /*r*/,  self) /*String::append*/;
-    variable0 = TAG_Int(UNTAG_Int(variable0)-UNTAG_Int( TAG_Int(1))) /*i*/;
-    continue_8: while(0);
-  }
-  break_8: while(0);
-  variable1 =  variable1 /*r*/;
-  goto return_label7;
-  return_label7: while(false);
-  tracehead = trace.prev;
-  return variable1;
+val_t string___AbstractString___has_suffix(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 90;
+  fra.me.meth = LOCATE_string___AbstractString___has_suffix;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 2;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB0 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB0 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+  REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[1])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[1]);
+  /* ./../lib/standard//kernel.nit:217 */
+  REGB1 = TAG_Int(UNTAG_Int(REGB0)-UNTAG_Int(REGB1));
+  /* ./../lib/standard//string.nit:94 */
+  REGB1 = CALL_string___AbstractString___has_substring(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1], REGB1);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB1;
 }
-val_t string___String___to_s(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 94, LOCATE_string___String___to_s};
-  val_t variable0;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 = NEW_String_string___String___from( self); /*new String*/
-  goto return_label9;
-  return_label9: while(false);
-  tracehead = trace.prev;
-  return variable0;
+val_t string___AbstractString___to_i(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 96;
+  fra.me.meth = LOCATE_string___AbstractString___to_i;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//string.nit:100 */
+  fra.me.REG[0] = CALL_string___Object___to_s(fra.me.REG[0])(fra.me.REG[0]);
+  fra.me.REG[0] = CALL_string___String___to_cstring(fra.me.REG[0])(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:596 */
+  REGB0 = TAG_Int(atoi(UNBOX_NativeString(fra.me.REG[0])));
+  /* ./../lib/standard//string.nit:100 */
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
 }
-val_t string___String___to_i(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 97, LOCATE_string___String___to_i};
-  val_t variable0;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 = ((string___String___to_cstring_t)CALL( self,COLOR_string___String___to_cstring))( self) /*String::to_cstring*/;
-  variable0 = TAG_Int(atoi(UNBOX_NativeString(variable0)));
-  goto return_label10;
-  return_label10: while(false);
-  tracehead = trace.prev;
-  return variable0;
+val_t string___AbstractString___to_hex(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 103;
+  fra.me.meth = LOCATE_string___AbstractString___to_hex;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//string.nit:104 */
+  REGB0 = TAG_Int(16);
+  REGB0 = CALL_string___AbstractString___a_to(fra.me.REG[0])(fra.me.REG[0], REGB0);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
 }
-val_t string___String___to_hex(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 104, LOCATE_string___String___to_hex};
-  val_t variable0;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 = ((string___String___a_to_t)CALL( self,COLOR_string___String___a_to))( self,  TAG_Int(16)) /*String::a_to*/;
-  goto return_label11;
-  return_label11: while(false);
-  tracehead = trace.prev;
-  return variable0;
+val_t string___AbstractString___a_to(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[3];} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 106;
+  fra.me.meth = LOCATE_string___AbstractString___a_to;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 4;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[3] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  REGB0 = p1;
+  /* ./../lib/standard//string.nit:106 */
+  fra.me.REG[1] = REGB0;
+  /* ./../lib/standard//string.nit:109 */
+  REGB0 = TAG_Int(0);
+  fra.me.REG[2] = REGB0;
+  /* ./../lib/standard//string.nit:110 */
+  REGB0 = TAG_Bool(false);
+  fra.me.REG[3] = REGB0;
+  CALL_abstract_collection___Collection___iterate(fra.me.REG[0])(fra.me.REG[0], (&(fra.me)), ((fun_t)OC_string___AbstractString___a_to_1));
+  switch ((&(fra.me))->has_broke) {
+    case 0: break;
+    case 1: (&(fra.me))->has_broke = 0; goto label3;
+  }
+  /* ./../lib/standard//string.nit:127 */
+  if (UNTAG_Bool(fra.me.REG[3])) {
+    /* ./../lib/standard//kernel.nit:216 */
+    REGB0 = TAG_Int(-UNTAG_Int(fra.me.REG[2]));
+    /* ./../lib/standard//string.nit:128 */
+    fra.me.REG[0] = REGB0;
+    goto label3;
+  } else {
+    /* ./../lib/standard//string.nit:130 */
+    fra.me.REG[0] = fra.me.REG[2];
+    goto label3;
+  }
+  label3: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
 }
-val_t string___String___a_to(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 107, LOCATE_string___String___a_to};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-  val_t variable3;
-    val_t variable4;
-    val_t variable5;
-    val_t variable6;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  variable1 =  TAG_Int(0);
-  variable2 =  TAG_Bool(false);
-  variable3 = ((array___AbstractArray___iterator_t)CALL( self,COLOR_abstract_collection___Collection___iterator))( self) /*AbstractArray::iterator*/;
-  while (true) { /*for*/
-    variable4 = ((array___ArrayIterator___is_ok_t)CALL(variable3,COLOR_abstract_collection___Iterator___is_ok))(variable3) /*ArrayIterator::is_ok*/;
-    if (!UNTAG_Bool(variable4)) break; /*for*/
-    variable4 = ((array___ArrayIterator___item_t)CALL(variable3,COLOR_abstract_collection___Iterator___item))(variable3) /*ArrayIterator::item*/;
-    variable6 = ((kernel___Char___to_i_t)CALL( variable4 /*c*/,COLOR_kernel___Char___to_i))( variable4 /*c*/) /*Char::to_i*/;
-    variable5 = variable6;
-    variable6 = TAG_Bool(UNTAG_Int( variable5 /*v*/)>UNTAG_Int( variable0 /*base*/));
-    if (UNTAG_Bool(variable6)) { /*if*/
-      if (UNTAG_Bool( variable2 /*neg*/)) { /*if*/
-        variable6 = TAG_Int(-UNTAG_Int( variable1 /*i*/));
-        variable1 = variable6;
-        goto return_label12;
-      } else { /*if*/
-        variable1 =  variable1 /*i*/;
-        goto return_label12;
+  void OC_string___AbstractString___a_to_1(struct stack_frame_t *closctx, val_t p0, struct stack_frame_t *closctx_param, fun_t clos_fun0){
+    struct {struct stack_frame_t me;} fra;
+    val_t REGB0;
+    val_t REGB1;
+    fun_t CREG[1];
+    val_t tmp;
+    /* ./../lib/standard//string.nit:112 */
+    fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+    fra.me.file = LOCATE_string;
+    fra.me.line = 0;
+    fra.me.meth = LOCATE_string___AbstractString___a_to;
+    fra.me.has_broke = 0;
+    fra.me.REG_size = 1;
+    fra.me.REG[0] = NIT_NULL;
+    fra.me.closure_ctx = closctx_param;
+    fra.me.closure_funs = CREG;
+    fra.me.REG[0] = p0;
+    CREG[0] = clos_fun0;
+    REGB0 = fra.me.REG[0];
+    /* ./../lib/standard//string.nit:114 */
+    REGB0 = CALL_kernel___Char___to_i(REGB0)(REGB0);
+    /* ./../lib/standard//kernel.nit:214 */
+    REGB1 = TAG_Bool(UNTAG_Int(REGB0)>UNTAG_Int(closctx->REG[1]));
+    /* ./../lib/standard//string.nit:115 */
+    if (UNTAG_Bool(REGB1)) {
+      /* ./../lib/standard//string.nit:116 */
+      if (UNTAG_Bool(closctx->REG[3])) {
+        /* ./../lib/standard//kernel.nit:216 */
+        REGB1 = TAG_Int(-UNTAG_Int(closctx->REG[2]));
+        /* ./../lib/standard//string.nit:117 */
+        closctx->REG[0] = REGB1;
+        closctx->has_broke = 1;
+        goto label2;
+      } else {
+        /* ./../lib/standard//string.nit:119 */
+        closctx->REG[0] = closctx->REG[2];
+        closctx->has_broke = 1;
+        goto label2;
       }
-    } else { /*if*/
-      variable6 = TAG_Bool(UNTAG_Int( variable5 /*v*/)<UNTAG_Int( TAG_Int(0)));
-      if (UNTAG_Bool(variable6)) { /*if*/
-        variable2 =  TAG_Bool(true) /*neg=*/;
-      } else { /*if*/
-        variable6 = TAG_Int(UNTAG_Int( variable1 /*i*/)*UNTAG_Int( variable0 /*base*/));
-        variable6 = TAG_Int(UNTAG_Int(variable6)+UNTAG_Int( variable5 /*v*/));
-        variable1 = variable6 /*i=*/;
+    } else {
+      /* ./../lib/standard//string.nit:121 */
+      REGB1 = TAG_Int(0);
+      /* ./../lib/standard//kernel.nit:212 */
+      REGB1 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB1));
+      /* ./../lib/standard//string.nit:121 */
+      if (UNTAG_Bool(REGB1)) {
+        /* ./../lib/standard//string.nit:122 */
+        REGB1 = TAG_Bool(true);
+        closctx->REG[3] = REGB1;
+      } else {
+        /* ./../lib/standard//kernel.nit:218 */
+        REGB1 = TAG_Int(UNTAG_Int(closctx->REG[2])*UNTAG_Int(closctx->REG[1]));
+        /* ./../lib/standard//kernel.nit:215 */
+        REGB0 = TAG_Int(UNTAG_Int(REGB1)+UNTAG_Int(REGB0));
+        /* ./../lib/standard//string.nit:124 */
+        closctx->REG[2] = REGB0;
       }
     }
-    continue_13: while(0);
-    ((array___ArrayIterator___next_t)CALL(variable3,COLOR_abstract_collection___Iterator___next))(variable3) /*ArrayIterator::next*/;
-  }
-  break_13: while(0);
-  if (UNTAG_Bool( variable2 /*neg*/)) { /*if*/
-    variable3 = TAG_Int(-UNTAG_Int( variable1 /*i*/));
-    variable1 = variable3;
-    goto return_label12;
-  } else { /*if*/
-    variable1 =  variable1 /*i*/;
-    goto return_label12;
-  }
-  return_label12: while(false);
-  tracehead = trace.prev;
-  return variable1;
+    label2: while(0);
+    stack_frame_head = fra.me.prev;
+    return;
+  }
+val_t string___AbstractString___to_upper(val_t p0){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 134;
+  fra.me.meth = LOCATE_string___AbstractString___to_upper;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 2;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB0 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB0 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:137 */
+  fra.me.REG[1] = NEW_Buffer_string___Buffer___with_capacity(REGB0);
+  CALL_abstract_collection___Collection___iterate(fra.me.REG[0])(fra.me.REG[0], (&(fra.me)), ((fun_t)OC_string___AbstractString___to_upper_1));
+  /* ./../lib/standard//string.nit:139 */
+  fra.me.REG[1] = CALL_string___Object___to_s(fra.me.REG[1])(fra.me.REG[1]);
+  goto label2;
+  label2: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[1];
 }
-val_t string___String___to_cstring(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 135, LOCATE_string___String___to_cstring};
-  val_t variable0;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 = ((array___AbstractArray___length_t)CALL( self,COLOR_abstract_collection___Collection___length))( self) /*AbstractArray::length*/;
-  ((string___String_____braeq_t)CALL( self,COLOR_abstract_collection___Map_____braeq))( self, variable0,  TAG_Char('\0')) /*String::[]=*/;
-  ATTR_array___AbstractArray____length( self) /*AbstractArray::_length*/ = TAG_Int(UNTAG_Int(ATTR_array___AbstractArray____length( self) /*AbstractArray::_length*/)-UNTAG_Int( TAG_Int(1)));
-  variable0 = ATTR_string___String____items( self) /*String::_items*/;
-  goto return_label14;
-  return_label14: while(false);
-  tracehead = trace.prev;
-  return variable0;
+  void OC_string___AbstractString___to_upper_1(struct stack_frame_t *closctx, val_t p0, struct stack_frame_t *closctx_param, fun_t clos_fun0){
+    struct {struct stack_frame_t me;} fra;
+    val_t REGB0;
+    fun_t CREG[1];
+    val_t tmp;
+    /* ./../lib/standard//string.nit:138 */
+    fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+    fra.me.file = LOCATE_string;
+    fra.me.line = 0;
+    fra.me.meth = LOCATE_string___AbstractString___to_upper;
+    fra.me.has_broke = 0;
+    fra.me.REG_size = 1;
+    fra.me.REG[0] = NIT_NULL;
+    fra.me.closure_ctx = closctx_param;
+    fra.me.closure_funs = CREG;
+    fra.me.REG[0] = p0;
+    CREG[0] = clos_fun0;
+    REGB0 = fra.me.REG[0];
+    REGB0 = CALL_kernel___Char___to_upper(REGB0)(REGB0);
+    CALL_abstract_collection___SimpleCollection___add(closctx->REG[1])(closctx->REG[1], REGB0);
+    stack_frame_head = fra.me.prev;
+    return;
+  }
+val_t string___AbstractString___to_lower(val_t p0){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 142;
+  fra.me.meth = LOCATE_string___AbstractString___to_lower;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 2;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB0 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB0 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:145 */
+  fra.me.REG[1] = NEW_Buffer_string___Buffer___with_capacity(REGB0);
+  CALL_abstract_collection___Collection___iterate(fra.me.REG[0])(fra.me.REG[0], (&(fra.me)), ((fun_t)OC_string___AbstractString___to_lower_1));
+  /* ./../lib/standard//string.nit:147 */
+  fra.me.REG[1] = CALL_string___Object___to_s(fra.me.REG[1])(fra.me.REG[1]);
+  goto label2;
+  label2: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[1];
 }
-val_t string___String___substring(val_t  self, val_t  param0, val_t  param1) {
-  struct trace_t trace = {NULL, NULL, 143, LOCATE_string___String___substring};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-    val_t variable3;
-    val_t variable4;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  variable1 =  param1;
-  variable2 = TAG_Bool(UNTAG_Int( variable1 /*count*/)>=UNTAG_Int( TAG_Int(0)));
-  if (!UNTAG_Bool(variable2)) { fprintf(stderr, "Assert%s failed", ""); fprintf(stderr, " in %s (%s:%d)\n", LOCATE_string___String___substring, LOCATE_string, 151); nit_exit(1);}
-  variable1 = TAG_Int(UNTAG_Int(variable1)+UNTAG_Int( variable0 /*from*/)) /*count*/;
-  variable2 = TAG_Bool(UNTAG_Int( variable0 /*from*/)<UNTAG_Int( TAG_Int(0)));
-  if (UNTAG_Bool(variable2)) { /*if*/
-    variable0 =  TAG_Int(0) /*from=*/;
-  }
-  variable2 = ((array___AbstractArray___length_t)CALL( self,COLOR_abstract_collection___Collection___length))( self) /*AbstractArray::length*/;
-  variable2 = TAG_Bool(UNTAG_Int( variable1 /*count*/)>UNTAG_Int(variable2));
-  if (UNTAG_Bool(variable2)) { /*if*/
-    variable2 = ((array___AbstractArray___length_t)CALL( self,COLOR_abstract_collection___Collection___length))( self) /*AbstractArray::length*/;
-    variable1 = variable2 /*count=*/;
-  }
-  variable2 = TAG_Bool(UNTAG_Int( variable0 /*from*/)<UNTAG_Int( variable1 /*count*/));
-  if (UNTAG_Bool(variable2)) { /*if*/
-    variable3 = TAG_Int(UNTAG_Int( variable1 /*count*/)-UNTAG_Int( variable0 /*from*/));
-    variable4 = NEW_String_string___String___with_capacity(variable3); /*new String*/
-    variable3 = variable4;
-    variable2 = variable3;
-    while (true) { /*while*/
-      variable3 = TAG_Bool(UNTAG_Int( variable0 /*from*/)<UNTAG_Int( variable1 /*count*/));
-      if (!UNTAG_Bool(variable3)) break; /* while*/
-      variable3 = ATTR_string___String____items( self) /*String::_items*/;
-      variable3 = TAG_Char(UNBOX_NativeString(variable3)[UNTAG_Int( variable0 /*from*/)]);
-      ((array___AbstractArray___push_t)CALL( variable2 /*r*/,COLOR_abstract_collection___IndexedCollection___push))( variable2 /*r*/, variable3) /*AbstractArray::push*/;
-      variable0 = TAG_Int(UNTAG_Int(variable0)+UNTAG_Int( TAG_Int(1))) /*from*/;
-      continue_16: while(0);
+  void OC_string___AbstractString___to_lower_1(struct stack_frame_t *closctx, val_t p0, struct stack_frame_t *closctx_param, fun_t clos_fun0){
+    struct {struct stack_frame_t me;} fra;
+    val_t REGB0;
+    fun_t CREG[1];
+    val_t tmp;
+    /* ./../lib/standard//string.nit:146 */
+    fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+    fra.me.file = LOCATE_string;
+    fra.me.line = 0;
+    fra.me.meth = LOCATE_string___AbstractString___to_lower;
+    fra.me.has_broke = 0;
+    fra.me.REG_size = 1;
+    fra.me.REG[0] = NIT_NULL;
+    fra.me.closure_ctx = closctx_param;
+    fra.me.closure_funs = CREG;
+    fra.me.REG[0] = p0;
+    CREG[0] = clos_fun0;
+    REGB0 = fra.me.REG[0];
+    REGB0 = CALL_kernel___Char___to_lower(REGB0)(REGB0);
+    CALL_abstract_collection___SimpleCollection___add(closctx->REG[1])(closctx->REG[1], REGB0);
+    stack_frame_head = fra.me.prev;
+    return;
+  }
+void string___AbstractString___output(val_t p0){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 151;
+  fra.me.meth = LOCATE_string___AbstractString___output;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 2;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//string.nit:153 */
+  REGB0 = TAG_Int(0);
+  /* ./../lib/standard//string.nit:154 */
+  while(1) {
+    /* ./../lib/standard//collection//array.nit:23 */
+    REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+    if (UNTAG_Bool(REGB1)) {
+    } else {
+      nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
     }
-    break_16: while(0);
-    variable2 =  variable2 /*r*/;
-    goto return_label15;
-  } else { /*if*/
-    variable2 = NEW_String_string___String___with_native(BOX_NativeString(""), TAG_Int(0)); /*new String*/
-    goto return_label15;
-  }
-  return_label15: while(false);
-  tracehead = trace.prev;
-  return variable2;
+    REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+    /* ./../lib/standard//kernel.nit:212 */
+    REGB1 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB1));
+    /* ./../lib/standard//string.nit:154 */
+    if (UNTAG_Bool(REGB1)) {
+      /* ./../lib/standard//string.nit:155 */
+      REGB1 = TAG_Bool(ATTR_string___AbstractString____items(fra.me.REG[0])!=NIT_NULL);
+      if (UNTAG_Bool(REGB1)) {
+      } else {
+        nit_abort("Uninitialized attribute %s", "_items", LOCATE_string, 155);
+      }
+      fra.me.REG[1] = ATTR_string___AbstractString____items(fra.me.REG[0]);
+      /* ./../lib/standard//string.nit:585 */
+      REGB1 = TAG_Char(UNBOX_NativeString(fra.me.REG[1])[UNTAG_Int(REGB0)]);
+      /* ./../lib/standard//kernel.nit:349 */
+      printf("%c", (unsigned char)UNTAG_Char(REGB1));;
+      /* ./../lib/standard//string.nit:156 */
+      REGB1 = TAG_Int(1);
+      /* ./../lib/standard//kernel.nit:215 */
+      REGB1 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB1));
+      /* ./../lib/standard//string.nit:156 */
+      REGB0 = REGB1;
+    } else {
+      /* ./../lib/standard//string.nit:154 */
+      goto label1;
+    }
+  }
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return;
 }
-val_t string___String___substring_from(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 167, LOCATE_string___String___substring_from};
-  val_t variable0;
-  val_t variable1;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  variable1 = ((array___AbstractArray___length_t)CALL( self,COLOR_abstract_collection___Collection___length))( self) /*AbstractArray::length*/;
-  variable1 = TAG_Bool(UNTAG_Int( variable0 /*from*/)<UNTAG_Int(variable1));
-  if (!UNTAG_Bool(variable1)) { fprintf(stderr, "Assert%s failed", ""); fprintf(stderr, " in %s (%s:%d)\n", LOCATE_string___String___substring_from, LOCATE_string, 174); nit_exit(1);}
-  variable1 = ((array___AbstractArray___length_t)CALL( self,COLOR_abstract_collection___Collection___length))( self) /*AbstractArray::length*/;
-  variable1 = TAG_Int(UNTAG_Int(variable1)-UNTAG_Int( variable0 /*from*/));
-  variable1 = ((string___String___substring_t)CALL( self,COLOR_string___String___substring))( self,  variable0 /*from*/, variable1) /*String::substring*/;
-  goto return_label17;
-  return_label17: while(false);
-  tracehead = trace.prev;
-  return variable1;
+void string___String___with_native(val_t p0, val_t p1, val_t p2, int* init_table){
+  int itpos0 = VAL2OBJ(p0)->vft[INIT_TABLE_POS_String].i;
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t tmp;
+  if (init_table[itpos0]) return;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 167;
+  fra.me.meth = LOCATE_string___String___with_native;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 2;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  REGB0 = p2;
+  /* ./../lib/standard//string.nit:170 */
+  REGB1 = TAG_Int(0);
+  /* ./../lib/standard//kernel.nit:213 */
+  REGB1 = TAG_Bool(UNTAG_Int(REGB0)>=UNTAG_Int(REGB1));
+  /* ./../lib/standard//string.nit:170 */
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Assert failed", NULL, LOCATE_string, 170);
+  }
+  /* ./../lib/standard//string.nit:171 */
+  ATTR_string___AbstractString____items(fra.me.REG[0]) = fra.me.REG[1];
+  /* ./../lib/standard//string.nit:172 */
+  ATTR_array___AbstractArrayRead____length(fra.me.REG[0]) = REGB0;
+  stack_frame_head = fra.me.prev;
+  init_table[itpos0] = 1;
+  return;
 }
-val_t string___String___has_substring(val_t  self, val_t  param0, val_t  param1) {
-  struct trace_t trace = {NULL, NULL, 178, LOCATE_string___String___has_substring};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-  val_t variable3;
-  val_t variable4;
-  val_t variable5;
-  val_t variable6;
-  val_t variable7;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  variable1 =  param1;
-  variable3 = ((array___AbstractArray___length_t)CALL( variable0 /*str*/,COLOR_abstract_collection___Collection___length))( variable0 /*str*/) /*AbstractArray::length*/;
-  variable3 = TAG_Int(UNTAG_Int(variable3)-UNTAG_Int( TAG_Int(1)));
-  variable2 = variable3;
-  variable4 = TAG_Int(UNTAG_Int( variable1 /*pos*/)+UNTAG_Int( variable2 /*itsindex*/));
-  variable3 = variable4;
-  variable5 = ATTR_string___String____items( self) /*String::_items*/;
-  variable4 = variable5;
-  variable6 = ATTR_string___String____items( variable0 /*str*/) /*String::_items*/;
-  variable5 = variable6;
-  variable6 = ((array___AbstractArray___length_t)CALL( self,COLOR_abstract_collection___Collection___length))( self) /*AbstractArray::length*/;
-  variable6 = TAG_Bool(UNTAG_Int( variable3 /*myindex*/)>UNTAG_Int(variable6));
-  variable7 = variable6;
-  if (!UNTAG_Bool(variable7)) { /* or */
-    variable7 = TAG_Bool(UNTAG_Int( variable2 /*itsindex*/)>UNTAG_Int( variable3 /*myindex*/));
-  }
-  variable6 = variable7;
-  if (UNTAG_Bool(variable6)) { /*if*/
-    variable2 =  TAG_Bool(false);
-    goto return_label18;
-  }
-  while (true) { /*while*/
-    variable6 = TAG_Bool(UNTAG_Int( variable2 /*itsindex*/)>UNTAG_Int( TAG_Int(0)));
-    if (!UNTAG_Bool(variable6)) break; /* while*/
-    variable6 = TAG_Char(UNBOX_NativeString( variable4 /*myitems*/)[UNTAG_Int( variable3 /*myindex*/)]);
-    variable7 = TAG_Char(UNBOX_NativeString( variable5 /*itsitems*/)[UNTAG_Int( variable2 /*itsindex*/)]);
-    variable6 = TAG_Bool((variable6)!=(variable7));
-    if (UNTAG_Bool(variable6)) { /*if*/
-      variable2 =  TAG_Bool(false);
-      goto return_label18;
-    }
-    variable3 = TAG_Int(UNTAG_Int(variable3)-UNTAG_Int( variable3 /*myindex*/)) /*myindex*/;
-    variable2 = TAG_Int(UNTAG_Int(variable2)-UNTAG_Int( variable2 /*itsindex*/)) /*itsindex*/;
-    continue_19: while(0);
-  }
-  break_19: while(0);
-  variable2 =  TAG_Bool(true);
-  goto return_label18;
-  return_label18: while(false);
-  tracehead = trace.prev;
-  return variable2;
+void string___String___from_cstring(val_t p0, val_t p1, int* init_table){
+  int itpos1 = VAL2OBJ(p0)->vft[INIT_TABLE_POS_String].i;
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t REGB0;
+  val_t tmp;
+  if (init_table[itpos1]) return;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 175;
+  fra.me.meth = LOCATE_string___String___from_cstring;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 2;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  /* ./../lib/standard//string.nit:178 */
+  REGB0 = CALL_string___NativeString___cstring_length(fra.me.REG[1])(fra.me.REG[1]);
+  /* ./../lib/standard//string.nit:179 */
+  ATTR_string___AbstractString____items(fra.me.REG[0]) = fra.me.REG[1];
+  /* ./../lib/standard//string.nit:180 */
+  ATTR_array___AbstractArrayRead____length(fra.me.REG[0]) = REGB0;
+  stack_frame_head = fra.me.prev;
+  init_table[itpos1] = 1;
+  return;
 }
-val_t string___String___has_prefix(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 197, LOCATE_string___String___has_prefix};
-  val_t variable0;
-  val_t variable1;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  variable1 = ((string___String___has_substring_t)CALL( self,COLOR_string___String___has_substring))( self,  variable0 /*prefix*/,  TAG_Int(0)) /*String::has_substring*/;
-  goto return_label20;
-  return_label20: while(false);
-  tracehead = trace.prev;
-  return variable1;
+val_t string___String___to_cstring(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 183;
+  fra.me.meth = LOCATE_string___String___to_cstring;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//string.nit:186 */
+  REGB0 = TAG_Bool(ATTR_string___AbstractString____items(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_items", LOCATE_string, 186);
+  }
+  fra.me.REG[0] = ATTR_string___AbstractString____items(fra.me.REG[0]);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
 }
-val_t string___String___has_suffix(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 203, LOCATE_string___String___has_suffix};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  variable1 = ((array___AbstractArray___length_t)CALL( self,COLOR_abstract_collection___Collection___length))( self) /*AbstractArray::length*/;
-  variable2 = ((array___AbstractArray___length_t)CALL( variable0 /*suffix*/,COLOR_abstract_collection___Collection___length))( variable0 /*suffix*/) /*AbstractArray::length*/;
-  variable1 = TAG_Int(UNTAG_Int(variable1)-UNTAG_Int(variable2));
-  variable1 = ((string___String___has_substring_t)CALL( self,COLOR_string___String___has_substring))( self,  variable0 /*suffix*/, variable1) /*String::has_substring*/;
-  goto return_label21;
-  return_label21: while(false);
-  tracehead = trace.prev;
-  return variable1;
+val_t string___String_____eqeq(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t REGB2;
+  val_t REGB3;
+  val_t REGB4;
+  val_t REGB5;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 189;
+  fra.me.meth = LOCATE_string___String_____eqeq;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 2;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  /* ./../lib/standard//string.nit:191 */
+  REGB0 = TAG_Bool((fra.me.REG[1]!=NIT_NULL) && VAL_ISA(fra.me.REG[1], COLOR_String, ID_String)) /*cast String*/;
+  REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
+  if (UNTAG_Bool(REGB0)) {
+    REGB0 = TAG_Bool(true);
+  } else {
+    REGB1 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
+    REGB0 = REGB1;
+  }
+  if (UNTAG_Bool(REGB0)) {
+    REGB0 = TAG_Bool(false);
+    goto label1;
+  }
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:193 */
+  REGB2 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
+  if (UNTAG_Bool(REGB2)) {
+    nit_abort("Reciever is null", NULL, LOCATE_string, 193);
+  }
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB2 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[1])!=NIT_NULL);
+  if (UNTAG_Bool(REGB2)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB2 = ATTR_array___AbstractArrayRead____length(fra.me.REG[1]);
+  /* ./../lib/standard//string.nit:193 */
+  REGB3 = TAG_Bool(IS_EQUAL_OO(REGB2,REGB1));
+  if (UNTAG_Bool(REGB3)) {
+  } else {
+    /* ./../lib/standard//kernel.nit:207 */
+    REGB2 = TAG_Bool((REGB2)==(REGB1));
+    /* ./../lib/standard//string.nit:193 */
+    REGB3 = REGB2;
+  }
+  REGB3 = TAG_Bool(!UNTAG_Bool(REGB3));
+  if (UNTAG_Bool(REGB3)) {
+    REGB3 = TAG_Bool(false);
+    REGB0 = REGB3;
+    goto label1;
+  }
+  /* ./../lib/standard//string.nit:194 */
+  REGB3 = TAG_Int(0);
+  /* ./../lib/standard//string.nit:195 */
+  REGB2 = TAG_Bool(ATTR_string___AbstractString____items(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB2)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_items", LOCATE_string, 195);
+  }
+  fra.me.REG[0] = ATTR_string___AbstractString____items(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:196 */
+  REGB2 = TAG_Bool(ATTR_string___AbstractString____items(fra.me.REG[1])!=NIT_NULL);
+  if (UNTAG_Bool(REGB2)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_items", LOCATE_string, 196);
+  }
+  fra.me.REG[1] = ATTR_string___AbstractString____items(fra.me.REG[1]);
+  /* ./../lib/standard//string.nit:197 */
+  while(1) {
+    /* ./../lib/standard//kernel.nit:212 */
+    REGB2 = TAG_Bool(UNTAG_Int(REGB3)<UNTAG_Int(REGB1));
+    /* ./../lib/standard//string.nit:197 */
+    if (UNTAG_Bool(REGB2)) {
+      /* ./../lib/standard//string.nit:585 */
+      REGB2 = TAG_Char(UNBOX_NativeString(fra.me.REG[0])[UNTAG_Int(REGB3)]);
+      REGB4 = TAG_Char(UNBOX_NativeString(fra.me.REG[1])[UNTAG_Int(REGB3)]);
+      /* ./../lib/standard//string.nit:198 */
+      REGB5 = TAG_Bool(IS_EQUAL_OO(REGB2,REGB4));
+      if (UNTAG_Bool(REGB5)) {
+      } else {
+        /* ./../lib/standard//kernel.nit:347 */
+        REGB4 = TAG_Bool((REGB2)==(REGB4));
+        /* ./../lib/standard//string.nit:198 */
+        REGB5 = REGB4;
+      }
+      REGB5 = TAG_Bool(!UNTAG_Bool(REGB5));
+      if (UNTAG_Bool(REGB5)) {
+        REGB5 = TAG_Bool(false);
+        REGB0 = REGB5;
+        goto label1;
+      }
+      /* ./../lib/standard//string.nit:199 */
+      REGB5 = TAG_Int(1);
+      /* ./../lib/standard//kernel.nit:215 */
+      REGB5 = TAG_Int(UNTAG_Int(REGB3)+UNTAG_Int(REGB5));
+      /* ./../lib/standard//string.nit:199 */
+      REGB3 = REGB5;
+    } else {
+      /* ./../lib/standard//string.nit:197 */
+      goto label2;
+    }
+  }
+  label2: while(0);
+  /* ./../lib/standard//string.nit:201 */
+  REGB3 = TAG_Bool(true);
+  REGB0 = REGB3;
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
 }
-val_t string___String_____l(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 209, LOCATE_string___String_____l};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-  val_t variable3;
-  val_t variable4;
-    val_t variable5;
-    val_t variable6;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  variable1 =  TAG_Int(0);
-  variable3 = ((array___AbstractArray___length_t)CALL( self,COLOR_abstract_collection___Collection___length))( self) /*AbstractArray::length*/;
-  variable2 = variable3;
-  variable4 = ((array___AbstractArray___length_t)CALL( variable0 /*s*/,COLOR_abstract_collection___Collection___length))( variable0 /*s*/) /*AbstractArray::length*/;
-  variable3 = variable4;
-  while (true) { /*while*/
-    variable4 = TAG_Bool(UNTAG_Int( variable1 /*i*/)<UNTAG_Int( variable2 /*l1*/));
-    variable5 = variable4;
-    if (UNTAG_Bool(variable5)) { /* and */
-      variable5 = TAG_Bool(UNTAG_Int( variable1 /*i*/)<UNTAG_Int( variable3 /*l2*/));
+val_t string___String_____l(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t REGB2;
+  val_t REGB3;
+  val_t REGB4;
+  val_t REGB5;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 204;
+  fra.me.meth = LOCATE_string___String_____l;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 2;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  /* ./../lib/standard//string.nit:206 */
+  REGB0 = TAG_Int(0);
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+  REGB2 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[1])!=NIT_NULL);
+  if (UNTAG_Bool(REGB2)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB2 = ATTR_array___AbstractArrayRead____length(fra.me.REG[1]);
+  /* ./../lib/standard//string.nit:209 */
+  REGB3 = TAG_Bool(ATTR_string___AbstractString____items(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB3)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_items", LOCATE_string, 209);
+  }
+  fra.me.REG[0] = ATTR_string___AbstractString____items(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:210 */
+  REGB3 = TAG_Bool(ATTR_string___AbstractString____items(fra.me.REG[1])!=NIT_NULL);
+  if (UNTAG_Bool(REGB3)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_items", LOCATE_string, 210);
+  }
+  fra.me.REG[1] = ATTR_string___AbstractString____items(fra.me.REG[1]);
+  /* ./../lib/standard//string.nit:211 */
+  while(1) {
+    /* ./../lib/standard//kernel.nit:212 */
+    REGB3 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB1));
+    /* ./../lib/standard//string.nit:211 */
+    if (UNTAG_Bool(REGB3)) {
+      /* ./../lib/standard//kernel.nit:212 */
+      REGB3 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB2));
+    } else {
+      /* ./../lib/standard//string.nit:211 */
+      REGB4 = TAG_Bool(false);
+      REGB3 = REGB4;
     }
-    variable4 = variable5;
-    if (!UNTAG_Bool(variable4)) break; /* while*/
-    variable5 = ((string___String_____bra_t)CALL( self,COLOR_abstract_collection___Map_____bra))( self,  variable1 /*i*/) /*String::[]*/;
-    variable5 = TAG_Int((unsigned char)UNTAG_Char(variable5));
-    variable4 = variable5;
-    variable6 = ((string___String_____bra_t)CALL( variable0 /*s*/,COLOR_abstract_collection___Map_____bra))( variable0 /*s*/,  variable1 /*i*/) /*String::[]*/;
-    variable6 = TAG_Int((unsigned char)UNTAG_Char(variable6));
-    variable5 = variable6;
-    variable6 = TAG_Bool(UNTAG_Int( variable4 /*c1*/)<UNTAG_Int( variable5 /*c2*/));
-    if (UNTAG_Bool(variable6)) { /*if*/
-      variable1 =  TAG_Bool(true);
-      goto return_label22;
-    } else { /*if*/
-      variable6 = TAG_Bool(UNTAG_Int( variable5 /*c2*/)<UNTAG_Int( variable4 /*c1*/));
-      if (UNTAG_Bool(variable6)) { /*if*/
-        variable1 =  TAG_Bool(false);
-        goto return_label22;
+    if (UNTAG_Bool(REGB3)) {
+      /* ./../lib/standard//string.nit:585 */
+      REGB3 = TAG_Char(UNBOX_NativeString(fra.me.REG[0])[UNTAG_Int(REGB0)]);
+      /* ./../lib/standard//kernel.nit:382 */
+      REGB3 = TAG_Int((unsigned char)UNTAG_Char(REGB3));
+      /* ./../lib/standard//string.nit:585 */
+      REGB4 = TAG_Char(UNBOX_NativeString(fra.me.REG[1])[UNTAG_Int(REGB0)]);
+      /* ./../lib/standard//kernel.nit:382 */
+      REGB4 = TAG_Int((unsigned char)UNTAG_Char(REGB4));
+      /* ./../lib/standard//kernel.nit:212 */
+      REGB5 = TAG_Bool(UNTAG_Int(REGB3)<UNTAG_Int(REGB4));
+      /* ./../lib/standard//string.nit:214 */
+      if (UNTAG_Bool(REGB5)) {
+        /* ./../lib/standard//string.nit:215 */
+        REGB5 = TAG_Bool(true);
+        goto label1;
+      } else {
+        /* ./../lib/standard//kernel.nit:212 */
+        REGB3 = TAG_Bool(UNTAG_Int(REGB4)<UNTAG_Int(REGB3));
+        /* ./../lib/standard//string.nit:216 */
+        if (UNTAG_Bool(REGB3)) {
+          /* ./../lib/standard//string.nit:217 */
+          REGB3 = TAG_Bool(false);
+          REGB5 = REGB3;
+          goto label1;
+        }
       }
+      /* ./../lib/standard//string.nit:219 */
+      REGB3 = TAG_Int(1);
+      /* ./../lib/standard//kernel.nit:215 */
+      REGB3 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB3));
+      /* ./../lib/standard//string.nit:219 */
+      REGB0 = REGB3;
+    } else {
+      /* ./../lib/standard//string.nit:211 */
+      goto label2;
+    }
+  }
+  label2: while(0);
+  /* ./../lib/standard//kernel.nit:212 */
+  REGB2 = TAG_Bool(UNTAG_Int(REGB1)<UNTAG_Int(REGB2));
+  /* ./../lib/standard//string.nit:221 */
+  if (UNTAG_Bool(REGB2)) {
+    /* ./../lib/standard//string.nit:222 */
+    REGB2 = TAG_Bool(true);
+    REGB5 = REGB2;
+    goto label1;
+  } else {
+    /* ./../lib/standard//string.nit:224 */
+    REGB2 = TAG_Bool(false);
+    REGB5 = REGB2;
+    goto label1;
+  }
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB5;
+}
+val_t string___String_____plus(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[2];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 228;
+  fra.me.meth = LOCATE_string___String_____plus;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 3;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB0 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB0 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+  REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[1])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[1]);
+  /* ./../lib/standard//kernel.nit:215 */
+  REGB1 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB1));
+  /* ./../lib/standard//string.nit:231 */
+  fra.me.REG[2] = NEW_Buffer_string___Buffer___with_capacity(REGB1);
+  /* ./../lib/standard//string.nit:232 */
+  CALL_abstract_collection___Sequence___append(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:233 */
+  CALL_abstract_collection___Sequence___append(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[1]);
+  /* ./../lib/standard//string.nit:234 */
+  fra.me.REG[2] = CALL_string___Object___to_s(fra.me.REG[2])(fra.me.REG[2]);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[2];
+}
+val_t string___String_____star(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 237;
+  fra.me.meth = LOCATE_string___String_____star;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 2;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  REGB0 = p1;
+  /* ./../lib/standard//string.nit:240 */
+  REGB1 = TAG_Int(0);
+  /* ./../lib/standard//kernel.nit:213 */
+  REGB1 = TAG_Bool(UNTAG_Int(REGB0)>=UNTAG_Int(REGB1));
+  /* ./../lib/standard//string.nit:240 */
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Assert failed", NULL, LOCATE_string, 240);
+  }
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+  /* ./../lib/standard//kernel.nit:218 */
+  REGB1 = TAG_Int(UNTAG_Int(REGB1)*UNTAG_Int(REGB0));
+  /* ./../lib/standard//string.nit:241 */
+  fra.me.REG[1] = NEW_Buffer_string___Buffer___with_capacity(REGB1);
+  /* ./../lib/standard//string.nit:242 */
+  while(1) {
+    REGB1 = TAG_Int(0);
+    /* ./../lib/standard//kernel.nit:214 */
+    REGB1 = TAG_Bool(UNTAG_Int(REGB0)>UNTAG_Int(REGB1));
+    /* ./../lib/standard//string.nit:242 */
+    if (UNTAG_Bool(REGB1)) {
+      /* ./../lib/standard//string.nit:243 */
+      CALL_abstract_collection___Sequence___append(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
+      /* ./../lib/standard//string.nit:244 */
+      REGB1 = TAG_Int(1);
+      /* ./../lib/standard//kernel.nit:217 */
+      REGB1 = TAG_Int(UNTAG_Int(REGB0)-UNTAG_Int(REGB1));
+      /* ./../lib/standard//string.nit:244 */
+      REGB0 = REGB1;
+    } else {
+      /* ./../lib/standard//string.nit:242 */
+      goto label1;
+    }
+  }
+  label1: while(0);
+  /* ./../lib/standard//string.nit:246 */
+  fra.me.REG[1] = CALL_string___Object___to_s(fra.me.REG[1])(fra.me.REG[1]);
+  goto label2;
+  label2: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[1];
+}
+val_t string___String___to_s(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 249;
+  fra.me.meth = LOCATE_string___String___to_s;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//string.nit:249 */
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
+}
+val_t string___String___hash(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t REGB2;
+  val_t REGB3;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 251;
+  fra.me.meth = LOCATE_string___String___hash;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//string.nit:254 */
+  REGB0 = TAG_Int(5381);
+  /* ./../lib/standard//string.nit:255 */
+  REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_string, 255);
+  }
+  REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+  REGB2 = TAG_Int(1);
+  /* ./../lib/standard//kernel.nit:217 */
+  REGB2 = TAG_Int(UNTAG_Int(REGB1)-UNTAG_Int(REGB2));
+  /* ./../lib/standard//string.nit:256 */
+  REGB1 = TAG_Bool(ATTR_string___AbstractString____items(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_items", LOCATE_string, 256);
+  }
+  fra.me.REG[0] = ATTR_string___AbstractString____items(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:257 */
+  while(1) {
+    REGB1 = TAG_Int(0);
+    /* ./../lib/standard//kernel.nit:213 */
+    REGB1 = TAG_Bool(UNTAG_Int(REGB2)>=UNTAG_Int(REGB1));
+    /* ./../lib/standard//string.nit:257 */
+    if (UNTAG_Bool(REGB1)) {
+      /* ./../lib/standard//string.nit:258 */
+      REGB1 = TAG_Int(32);
+      /* ./../lib/standard//kernel.nit:218 */
+      REGB1 = TAG_Int(UNTAG_Int(REGB0)*UNTAG_Int(REGB1));
+      /* ./../lib/standard//kernel.nit:215 */
+      REGB1 = TAG_Int(UNTAG_Int(REGB1)+UNTAG_Int(REGB0));
+      /* ./../lib/standard//string.nit:585 */
+      REGB3 = TAG_Char(UNBOX_NativeString(fra.me.REG[0])[UNTAG_Int(REGB2)]);
+      /* ./../lib/standard//kernel.nit:382 */
+      REGB3 = TAG_Int((unsigned char)UNTAG_Char(REGB3));
+      /* ./../lib/standard//kernel.nit:215 */
+      REGB3 = TAG_Int(UNTAG_Int(REGB1)+UNTAG_Int(REGB3));
+      /* ./../lib/standard//string.nit:258 */
+      REGB0 = REGB3;
+      /* ./../lib/standard//string.nit:259 */
+      REGB3 = TAG_Int(1);
+      /* ./../lib/standard//kernel.nit:217 */
+      REGB3 = TAG_Int(UNTAG_Int(REGB2)-UNTAG_Int(REGB3));
+      /* ./../lib/standard//string.nit:259 */
+      REGB2 = REGB3;
+    } else {
+      /* ./../lib/standard//string.nit:257 */
+      goto label1;
     }
-    variable1 = TAG_Int(UNTAG_Int(variable1)+UNTAG_Int( TAG_Int(1))) /*i*/;
-    continue_23: while(0);
-  }
-  break_23: while(0);
-  variable4 = TAG_Bool(UNTAG_Int( variable2 /*l1*/)<UNTAG_Int( variable3 /*l2*/));
-  if (UNTAG_Bool(variable4)) { /*if*/
-    variable1 =  TAG_Bool(true);
-    goto return_label22;
-  } else { /*if*/
-    variable1 =  TAG_Bool(false);
-    goto return_label22;
-  }
-  return_label22: while(false);
-  tracehead = trace.prev;
-  return variable1;
+  }
+  label1: while(0);
+  /* ./../lib/standard//string.nit:261 */
+  goto label2;
+  label2: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
 }
-void string___String___init(val_t  self, int* init_table) {
-  struct trace_t trace = {NULL, NULL, 231, LOCATE_string___String___init};
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  if (init_table[VAL2OBJ( self)->vft[INIT_TABLE_POS_String].i]) return;
-  ((string___String___with_capacity_t)CALL( self,COLOR_string___String___with_capacity))( self,  TAG_Int(5), init_table /*YYY*/) /*String::with_capacity*/;
-  init_table[VAL2OBJ( self)->vft[INIT_TABLE_POS_String].i] = 1;
-  tracehead = trace.prev;
+void string___Buffer_____braeq(val_t p0, val_t p1, val_t p2){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t REGB2;
+  val_t REGB3;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 275;
+  fra.me.meth = LOCATE_string___Buffer_____braeq;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  REGB0 = p1;
+  REGB1 = p2;
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB2 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB2)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB2 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:277 */
+  REGB3 = TAG_Bool(IS_EQUAL_OO(REGB0,REGB2));
+  if (UNTAG_Bool(REGB3)) {
+  } else {
+    /* ./../lib/standard//kernel.nit:207 */
+    REGB2 = TAG_Bool((REGB0)==(REGB2));
+    /* ./../lib/standard//string.nit:277 */
+    REGB3 = REGB2;
+  }
+  if (UNTAG_Bool(REGB3)) {
+    /* ./../lib/standard//string.nit:278 */
+    CALL_abstract_collection___SimpleCollection___add(fra.me.REG[0])(fra.me.REG[0], REGB1);
+    /* ./../lib/standard//string.nit:279 */
+    goto label1;
+  }
+  /* ./../lib/standard//string.nit:281 */
+  REGB3 = TAG_Int(0);
+  /* ./../lib/standard//kernel.nit:213 */
+  REGB3 = TAG_Bool(UNTAG_Int(REGB0)>=UNTAG_Int(REGB3));
+  /* ./../lib/standard//string.nit:281 */
+  if (UNTAG_Bool(REGB3)) {
+    /* ./../lib/standard//collection//array.nit:23 */
+    REGB3 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+    if (UNTAG_Bool(REGB3)) {
+    } else {
+      nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+    }
+    REGB3 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+    /* ./../lib/standard//kernel.nit:212 */
+    REGB3 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB3));
+  } else {
+    /* ./../lib/standard//string.nit:281 */
+    REGB2 = TAG_Bool(false);
+    REGB3 = REGB2;
+  }
+  if (UNTAG_Bool(REGB3)) {
+  } else {
+    nit_abort("Assert failed", NULL, LOCATE_string, 281);
+  }
+  /* ./../lib/standard//string.nit:282 */
+  REGB3 = TAG_Bool(ATTR_string___AbstractString____items(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB3)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_items", LOCATE_string, 282);
+  }
+  fra.me.REG[0] = ATTR_string___AbstractString____items(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:586 */
+  UNBOX_NativeString(fra.me.REG[0])[UNTAG_Int(REGB0)]=UNTAG_Char(REGB1);;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
   return;
 }
-void string___String___from(val_t  self, val_t  param0, int* init_table) {
-  struct trace_t trace = {NULL, NULL, 237, LOCATE_string___String___from};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-  val_t variable3;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  if (init_table[VAL2OBJ( self)->vft[INIT_TABLE_POS_String].i]) return;
-  variable1 = ((array___AbstractArray___length_t)CALL( variable0 /*s*/,COLOR_abstract_collection___Collection___length))( variable0 /*s*/) /*AbstractArray::length*/;
-  variable1 = TAG_Int(UNTAG_Int(variable1)+UNTAG_Int( TAG_Int(1)));
-  ATTR_string___String____capacity( self) /*String::_capacity*/ = variable1;
-  variable1 = ((array___AbstractArray___length_t)CALL( variable0 /*s*/,COLOR_abstract_collection___Collection___length))( variable0 /*s*/) /*AbstractArray::length*/;
-  ATTR_array___AbstractArray____length( self) /*AbstractArray::_length*/ = variable1;
-  variable1 = ATTR_string___String____capacity( self) /*String::_capacity*/;
-  variable1 = BOX_NativeString((char*)malloc((UNTAG_Int(variable1) * sizeof(char))));
-  ATTR_string___String____items( self) /*String::_items*/ = variable1;
-  variable1 = ((string___String___items_t)CALL( variable0 /*s*/,COLOR_string___String___items))( variable0 /*s*/) /*String::items*/;
-  variable2 = ATTR_string___String____items( self) /*String::_items*/;
-  variable3 = ATTR_array___AbstractArray____length( self) /*AbstractArray::_length*/;
-  (void)memcpy(UNBOX_NativeString(variable2)+UNTAG_Int( TAG_Int(0)), UNBOX_NativeString(variable1)+UNTAG_Int( TAG_Int(0)), UNTAG_Int(variable3));
-  init_table[VAL2OBJ( self)->vft[INIT_TABLE_POS_String].i] = 1;
-  tracehead = trace.prev;
+void string___Buffer___add(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t REGB2;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 285;
+  fra.me.meth = LOCATE_string___Buffer___add;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 2;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  REGB0 = p1;
+  /* ./../lib/standard//string.nit:287 */
+  REGB1 = TAG_Bool(ATTR_string___Buffer____capacity(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_capacity", LOCATE_string, 287);
+  }
+  REGB1 = ATTR_string___Buffer____capacity(fra.me.REG[0]);
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB2 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB2)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB2 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+  /* ./../lib/standard//kernel.nit:211 */
+  REGB2 = TAG_Bool(UNTAG_Int(REGB1)<=UNTAG_Int(REGB2));
+  /* ./../lib/standard//string.nit:287 */
+  if (UNTAG_Bool(REGB2)) {
+    /* ./../lib/standard//collection//array.nit:23 */
+    REGB2 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+    if (UNTAG_Bool(REGB2)) {
+    } else {
+      nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+    }
+    REGB2 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+    /* ./../lib/standard//string.nit:287 */
+    REGB1 = TAG_Int(5);
+    /* ./../lib/standard//kernel.nit:215 */
+    REGB1 = TAG_Int(UNTAG_Int(REGB2)+UNTAG_Int(REGB1));
+    /* ./../lib/standard//string.nit:287 */
+    CALL_array___AbstractArray___enlarge(fra.me.REG[0])(fra.me.REG[0], REGB1);
+  }
+  /* ./../lib/standard//string.nit:288 */
+  REGB1 = TAG_Bool(ATTR_string___AbstractString____items(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_items", LOCATE_string, 288);
+  }
+  fra.me.REG[1] = ATTR_string___AbstractString____items(fra.me.REG[0]);
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:586 */
+  UNBOX_NativeString(fra.me.REG[1])[UNTAG_Int(REGB1)]=UNTAG_Char(REGB0);;
+  /* ./../lib/standard//string.nit:289 */
+  REGB0 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+  REGB1 = TAG_Int(1);
+  /* ./../lib/standard//kernel.nit:215 */
+  REGB1 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB1));
+  /* ./../lib/standard//string.nit:289 */
+  ATTR_array___AbstractArrayRead____length(fra.me.REG[0]) = REGB1;
+  stack_frame_head = fra.me.prev;
   return;
 }
-void string___String___with_capacity(val_t  self, val_t  param0, int* init_table) {
-  struct trace_t trace = {NULL, NULL, 245, LOCATE_string___String___with_capacity};
-  val_t variable0;
-  val_t variable1;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  if (init_table[VAL2OBJ( self)->vft[INIT_TABLE_POS_String].i]) return;
-  variable1 = TAG_Bool(UNTAG_Int( variable0 /*cap*/)>=UNTAG_Int( TAG_Int(0)));
-  if (!UNTAG_Bool(variable1)) { fprintf(stderr, "Assert%s failed", ""); fprintf(stderr, " in %s (%s:%d)\n", LOCATE_string___String___with_capacity, LOCATE_string, 248); nit_exit(1);}
-  variable1 = BOX_NativeString((char*)malloc((UNTAG_Int( variable0 /*cap*/) * sizeof(char))));
-  ATTR_string___String____items( self) /*String::_items*/ = variable1;
-  ATTR_string___String____capacity( self) /*String::_capacity*/ =  variable0 /*cap*/;
-  ATTR_array___AbstractArray____length( self) /*AbstractArray::_length*/ =  TAG_Int(0);
-  init_table[VAL2OBJ( self)->vft[INIT_TABLE_POS_String].i] = 1;
-  tracehead = trace.prev;
+void string___Buffer___enlarge(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[2];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t REGB2;
+  val_t REGB3;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 292;
+  fra.me.meth = LOCATE_string___Buffer___enlarge;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 3;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  REGB0 = p1;
+  /* ./../lib/standard//string.nit:294 */
+  REGB1 = TAG_Bool(ATTR_string___Buffer____capacity(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_capacity", LOCATE_string, 294);
+  }
+  REGB1 = ATTR_string___Buffer____capacity(fra.me.REG[0]);
+  /* ./../lib/standard//kernel.nit:211 */
+  REGB2 = TAG_Bool(UNTAG_Int(REGB0)<=UNTAG_Int(REGB1));
+  /* ./../lib/standard//string.nit:295 */
+  if (UNTAG_Bool(REGB2)) {
+    goto label1;
+  }
+  /* ./../lib/standard//string.nit:296 */
+  while(1) {
+    /* ./../lib/standard//kernel.nit:211 */
+    REGB2 = TAG_Bool(UNTAG_Int(REGB1)<=UNTAG_Int(REGB0));
+    /* ./../lib/standard//string.nit:296 */
+    if (UNTAG_Bool(REGB2)) {
+      REGB2 = TAG_Int(2);
+      /* ./../lib/standard//kernel.nit:218 */
+      REGB2 = TAG_Int(UNTAG_Int(REGB1)*UNTAG_Int(REGB2));
+      /* ./../lib/standard//string.nit:296 */
+      REGB3 = TAG_Int(2);
+      /* ./../lib/standard//kernel.nit:215 */
+      REGB3 = TAG_Int(UNTAG_Int(REGB2)+UNTAG_Int(REGB3));
+      /* ./../lib/standard//string.nit:296 */
+      REGB1 = REGB3;
+    } else {
+      goto label2;
+    }
+  }
+  label2: while(0);
+  /* ./../lib/standard//string.nit:297 */
+  REGB0 = TAG_Int(1);
+  /* ./../lib/standard//kernel.nit:215 */
+  REGB0 = TAG_Int(UNTAG_Int(REGB1)+UNTAG_Int(REGB0));
+  /* ./../lib/standard//string.nit:601 */
+  fra.me.REG[1] = BOX_NativeString((char*)raw_alloc((UNTAG_Int(REGB0) * sizeof(char))));
+  /* ./../lib/standard//string.nit:298 */
+  REGB0 = TAG_Bool(ATTR_string___AbstractString____items(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_items", LOCATE_string, 298);
+  }
+  fra.me.REG[2] = ATTR_string___AbstractString____items(fra.me.REG[0]);
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB0 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB0 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:298 */
+  REGB3 = TAG_Int(0);
+  REGB2 = TAG_Int(0);
+  /* ./../lib/standard//string.nit:587 */
+  (void)memcpy(UNBOX_NativeString(fra.me.REG[1])+UNTAG_Int(REGB2), UNBOX_NativeString(fra.me.REG[2])+UNTAG_Int(REGB3), UNTAG_Int(REGB0));;
+  /* ./../lib/standard//string.nit:299 */
+  ATTR_string___AbstractString____items(fra.me.REG[0]) = fra.me.REG[1];
+  /* ./../lib/standard//string.nit:300 */
+  ATTR_string___Buffer____capacity(fra.me.REG[0]) = REGB1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
   return;
 }
-void string___String___with_native(val_t  self, val_t  param0, val_t  param1, int* init_table) {
-  struct trace_t trace = {NULL, NULL, 255, LOCATE_string___String___with_native};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  variable1 =  param1;
-  if (init_table[VAL2OBJ( self)->vft[INIT_TABLE_POS_String].i]) return;
-  variable2 = TAG_Bool(UNTAG_Int( variable1 /*size*/)>=UNTAG_Int( TAG_Int(0)));
-  if (!UNTAG_Bool(variable2)) { fprintf(stderr, "Assert%s failed", ""); fprintf(stderr, " in %s (%s:%d)\n", LOCATE_string___String___with_native, LOCATE_string, 258); nit_exit(1);}
-  ATTR_string___String____items( self) /*String::_items*/ =  variable0 /*nat*/;
-  ATTR_string___String____capacity( self) /*String::_capacity*/ =  variable1 /*size*/;
-  ATTR_array___AbstractArray____length( self) /*AbstractArray::_length*/ =  variable1 /*size*/;
-  init_table[VAL2OBJ( self)->vft[INIT_TABLE_POS_String].i] = 1;
-  tracehead = trace.prev;
+void string___Buffer___append(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[4];} 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_string;
+  fra.me.line = 303;
+  fra.me.meth = LOCATE_string___Buffer___append;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 5;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[3] = NIT_NULL;
+  fra.me.REG[4] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  /* ./../lib/standard//string.nit:303 */
+  fra.me.REG[2] = fra.me.REG[0];
+  fra.me.REG[3] = fra.me.REG[1];
+  /* ./../lib/standard//string.nit:305 */
+  REGB0 = TAG_Bool(VAL_ISA(fra.me.REG[3], COLOR_String, ID_String)) /*cast String*/;
+  if (UNTAG_Bool(REGB0)) {
+    /* ./../lib/standard//collection//array.nit:23 */
+    REGB0 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[3])!=NIT_NULL);
+    if (UNTAG_Bool(REGB0)) {
+    } else {
+      nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+    }
+    REGB0 = ATTR_array___AbstractArrayRead____length(fra.me.REG[3]);
+    /* ./../lib/standard//string.nit:307 */
+    REGB1 = TAG_Bool(ATTR_string___Buffer____capacity(fra.me.REG[2])!=NIT_NULL);
+    if (UNTAG_Bool(REGB1)) {
+    } else {
+      nit_abort("Uninitialized attribute %s", "_capacity", LOCATE_string, 307);
+    }
+    REGB1 = ATTR_string___Buffer____capacity(fra.me.REG[2]);
+    /* ./../lib/standard//collection//array.nit:23 */
+    REGB2 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[2])!=NIT_NULL);
+    if (UNTAG_Bool(REGB2)) {
+    } else {
+      nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+    }
+    REGB2 = ATTR_array___AbstractArrayRead____length(fra.me.REG[2]);
+    /* ./../lib/standard//kernel.nit:215 */
+    REGB2 = TAG_Int(UNTAG_Int(REGB2)+UNTAG_Int(REGB0));
+    /* ./../lib/standard//kernel.nit:212 */
+    REGB2 = TAG_Bool(UNTAG_Int(REGB1)<UNTAG_Int(REGB2));
+    /* ./../lib/standard//string.nit:307 */
+    if (UNTAG_Bool(REGB2)) {
+      /* ./../lib/standard//collection//array.nit:23 */
+      REGB2 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[2])!=NIT_NULL);
+      if (UNTAG_Bool(REGB2)) {
+      } else {
+        nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+      }
+      REGB2 = ATTR_array___AbstractArrayRead____length(fra.me.REG[2]);
+      /* ./../lib/standard//kernel.nit:215 */
+      REGB2 = TAG_Int(UNTAG_Int(REGB2)+UNTAG_Int(REGB0));
+      /* ./../lib/standard//string.nit:307 */
+      CALL_array___AbstractArray___enlarge(fra.me.REG[2])(fra.me.REG[2], REGB2);
+    }
+    /* ./../lib/standard//string.nit:308 */
+    fra.me.REG[3] = CALL_string___AbstractString___items(fra.me.REG[3])(fra.me.REG[3]);
+    REGB2 = TAG_Bool(ATTR_string___AbstractString____items(fra.me.REG[2])!=NIT_NULL);
+    if (UNTAG_Bool(REGB2)) {
+    } else {
+      nit_abort("Uninitialized attribute %s", "_items", LOCATE_string, 308);
+    }
+    fra.me.REG[4] = ATTR_string___AbstractString____items(fra.me.REG[2]);
+    REGB2 = TAG_Int(0);
+    /* ./../lib/standard//collection//array.nit:23 */
+    REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[2])!=NIT_NULL);
+    if (UNTAG_Bool(REGB1)) {
+    } else {
+      nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+    }
+    REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[2]);
+    /* ./../lib/standard//string.nit:587 */
+    (void)memcpy(UNBOX_NativeString(fra.me.REG[4])+UNTAG_Int(REGB1), UNBOX_NativeString(fra.me.REG[3])+UNTAG_Int(REGB2), UNTAG_Int(REGB0));;
+    /* ./../lib/standard//string.nit:309 */
+    REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[2]);
+    /* ./../lib/standard//kernel.nit:215 */
+    REGB0 = TAG_Int(UNTAG_Int(REGB1)+UNTAG_Int(REGB0));
+    /* ./../lib/standard//string.nit:309 */
+    ATTR_array___AbstractArrayRead____length(fra.me.REG[2]) = REGB0;
+  } else {
+    /* ./../lib/standard//string.nit:311 */
+    CALL_SUPER_string___Buffer___append(fra.me.REG[0])(fra.me.REG[0], fra.me.REG[1]);
+  }
+  stack_frame_head = fra.me.prev;
   return;
 }
-void string___String___from_cstring(val_t  self, val_t  param0, int* init_table) {
-  struct trace_t trace = {NULL, NULL, 264, LOCATE_string___String___from_cstring};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  if (init_table[VAL2OBJ( self)->vft[INIT_TABLE_POS_String].i]) return;
-  variable2 = ((string___NativeString___cstring_length_t)CALL( variable0 /*str*/,COLOR_string___NativeString___cstring_length))( variable0 /*str*/) /*NativeString::cstring_length*/;
-  variable1 = variable2;
-  ATTR_string___String____items( self) /*String::_items*/ =  variable0 /*str*/;
-  variable2 = TAG_Int(UNTAG_Int( variable1 /*size*/)+UNTAG_Int( TAG_Int(1)));
-  ATTR_string___String____capacity( self) /*String::_capacity*/ = variable2;
-  ATTR_array___AbstractArray____length( self) /*AbstractArray::_length*/ =  variable1 /*size*/;
-  init_table[VAL2OBJ( self)->vft[INIT_TABLE_POS_String].i] = 1;
-  tracehead = trace.prev;
+val_t string___Buffer___to_s(val_t p0){
+  struct {struct stack_frame_t me; val_t MORE_REG[2];} 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_string;
+  fra.me.line = 315;
+  fra.me.meth = LOCATE_string___Buffer___to_s;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 3;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB0 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB0 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:318 */
+  REGB1 = TAG_Int(1);
+  /* ./../lib/standard//kernel.nit:215 */
+  REGB1 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB1));
+  /* ./../lib/standard//string.nit:601 */
+  fra.me.REG[1] = BOX_NativeString((char*)raw_alloc((UNTAG_Int(REGB1) * sizeof(char))));
+  /* ./../lib/standard//string.nit:319 */
+  REGB1 = TAG_Bool(ATTR_string___AbstractString____items(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_items", LOCATE_string, 319);
+  }
+  fra.me.REG[2] = ATTR_string___AbstractString____items(fra.me.REG[0]);
+  REGB1 = TAG_Int(0);
+  REGB2 = TAG_Int(0);
+  /* ./../lib/standard//string.nit:587 */
+  (void)memcpy(UNBOX_NativeString(fra.me.REG[1])+UNTAG_Int(REGB2), UNBOX_NativeString(fra.me.REG[2])+UNTAG_Int(REGB1), UNTAG_Int(REGB0));;
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB2 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB2)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB2 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:322 */
+  REGB1 = TAG_Char('\0');
+  /* ./../lib/standard//string.nit:586 */
+  UNBOX_NativeString(fra.me.REG[1])[UNTAG_Int(REGB2)]=UNTAG_Char(REGB1);;
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:324 */
+  fra.me.REG[1] = NEW_String_string___String___with_native(fra.me.REG[1], REGB1);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[1];
+}
+val_t string___Buffer_____l(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t REGB2;
+  val_t REGB3;
+  val_t REGB4;
+  val_t REGB5;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 327;
+  fra.me.meth = LOCATE_string___Buffer_____l;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 2;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  /* ./../lib/standard//string.nit:329 */
+  REGB0 = TAG_Int(0);
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+  REGB2 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[1])!=NIT_NULL);
+  if (UNTAG_Bool(REGB2)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB2 = ATTR_array___AbstractArrayRead____length(fra.me.REG[1]);
+  /* ./../lib/standard//string.nit:332 */
+  while(1) {
+    /* ./../lib/standard//kernel.nit:212 */
+    REGB3 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB1));
+    /* ./../lib/standard//string.nit:332 */
+    if (UNTAG_Bool(REGB3)) {
+      /* ./../lib/standard//kernel.nit:212 */
+      REGB3 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB2));
+    } else {
+      /* ./../lib/standard//string.nit:332 */
+      REGB4 = TAG_Bool(false);
+      REGB3 = REGB4;
+    }
+    if (UNTAG_Bool(REGB3)) {
+      /* ./../lib/standard//string.nit:333 */
+      REGB3 = CALL_abstract_collection___MapRead_____bra(fra.me.REG[0])(fra.me.REG[0], REGB0);
+      /* ./../lib/standard//kernel.nit:382 */
+      REGB3 = TAG_Int((unsigned char)UNTAG_Char(REGB3));
+      /* ./../lib/standard//string.nit:334 */
+      REGB4 = CALL_abstract_collection___MapRead_____bra(fra.me.REG[1])(fra.me.REG[1], REGB0);
+      /* ./../lib/standard//kernel.nit:382 */
+      REGB4 = TAG_Int((unsigned char)UNTAG_Char(REGB4));
+      /* ./../lib/standard//kernel.nit:212 */
+      REGB5 = TAG_Bool(UNTAG_Int(REGB3)<UNTAG_Int(REGB4));
+      /* ./../lib/standard//string.nit:335 */
+      if (UNTAG_Bool(REGB5)) {
+        /* ./../lib/standard//string.nit:336 */
+        REGB5 = TAG_Bool(true);
+        goto label1;
+      } else {
+        /* ./../lib/standard//kernel.nit:212 */
+        REGB3 = TAG_Bool(UNTAG_Int(REGB4)<UNTAG_Int(REGB3));
+        /* ./../lib/standard//string.nit:337 */
+        if (UNTAG_Bool(REGB3)) {
+          /* ./../lib/standard//string.nit:338 */
+          REGB3 = TAG_Bool(false);
+          REGB5 = REGB3;
+          goto label1;
+        }
+      }
+      /* ./../lib/standard//string.nit:340 */
+      REGB3 = TAG_Int(1);
+      /* ./../lib/standard//kernel.nit:215 */
+      REGB3 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB3));
+      /* ./../lib/standard//string.nit:340 */
+      REGB0 = REGB3;
+    } else {
+      /* ./../lib/standard//string.nit:332 */
+      goto label2;
+    }
+  }
+  label2: while(0);
+  /* ./../lib/standard//kernel.nit:212 */
+  REGB2 = TAG_Bool(UNTAG_Int(REGB1)<UNTAG_Int(REGB2));
+  /* ./../lib/standard//string.nit:342 */
+  if (UNTAG_Bool(REGB2)) {
+    /* ./../lib/standard//string.nit:343 */
+    REGB2 = TAG_Bool(true);
+    REGB5 = REGB2;
+    goto label1;
+  } else {
+    /* ./../lib/standard//string.nit:345 */
+    REGB2 = TAG_Bool(false);
+    REGB5 = REGB2;
+    goto label1;
+  }
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB5;
+}
+void string___Buffer___init(val_t p0, int* init_table){
+  int itpos2 = VAL2OBJ(p0)->vft[INIT_TABLE_POS_Buffer].i;
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t tmp;
+  if (init_table[itpos2]) return;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 349;
+  fra.me.meth = LOCATE_string___Buffer___init;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//string.nit:352 */
+  REGB0 = TAG_Int(5);
+  CALL_string___Buffer___with_capacity(fra.me.REG[0])(fra.me.REG[0], REGB0, init_table);
+  stack_frame_head = fra.me.prev;
+  init_table[itpos2] = 1;
   return;
 }
-void string___String___filled_with(val_t  self, val_t  param0, val_t  param1, int* init_table) {
-  struct trace_t trace = {NULL, NULL, 273, LOCATE_string___String___filled_with};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-    val_t variable3;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  variable1 =  param1;
-  if (init_table[VAL2OBJ( self)->vft[INIT_TABLE_POS_String].i]) return;
-  ((string___String___with_capacity_t)CALL( self,COLOR_string___String___with_capacity))( self,  variable1 /*count*/, init_table /*YYY*/) /*String::with_capacity*/;
-  variable2 =  TAG_Int(0);
-  while (true) { /*while*/
-    variable3 = TAG_Bool(UNTAG_Int( variable2 /*i*/)<UNTAG_Int( variable1 /*count*/));
-    if (!UNTAG_Bool(variable3)) break; /* while*/
-    variable3 = ATTR_string___String____items( self) /*String::_items*/;
-    UNBOX_NativeString(variable3)[UNTAG_Int( variable2 /*i*/)]=UNTAG_Char( variable0 /*c*/);
-    variable2 = TAG_Int(UNTAG_Int(variable2)+UNTAG_Int( TAG_Int(1))) /*i*/;
-    continue_30: while(0);
-  }
-  break_30: while(0);
-  ATTR_array___AbstractArray____length( self) /*AbstractArray::_length*/ =  variable1 /*count*/;
-  init_table[VAL2OBJ( self)->vft[INIT_TABLE_POS_String].i] = 1;
-  tracehead = trace.prev;
+void string___Buffer___from(val_t p0, val_t p1, int* init_table){
+  int itpos3 = VAL2OBJ(p0)->vft[INIT_TABLE_POS_Buffer].i;
+  struct {struct stack_frame_t me; val_t MORE_REG[2];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t REGB2;
+  val_t tmp;
+  if (init_table[itpos3]) return;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 355;
+  fra.me.meth = LOCATE_string___Buffer___from;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 3;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  /* ./../lib/standard//string.nit:355 */
+  fra.me.REG[2] = fra.me.REG[0];
+  CALL_string___StringCapable___init(fra.me.REG[0])(fra.me.REG[0], init_table);
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB0 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[1])!=NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB0 = ATTR_array___AbstractArrayRead____length(fra.me.REG[1]);
+  /* ./../lib/standard//string.nit:357 */
+  REGB1 = TAG_Int(1);
+  /* ./../lib/standard//kernel.nit:215 */
+  REGB1 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB1));
+  /* ./../lib/standard//string.nit:357 */
+  ATTR_string___Buffer____capacity(fra.me.REG[2]) = REGB1;
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[1])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[1]);
+  /* ./../lib/standard//string.nit:358 */
+  ATTR_array___AbstractArrayRead____length(fra.me.REG[2]) = REGB1;
+  /* ./../lib/standard//string.nit:359 */
+  REGB1 = TAG_Bool(ATTR_string___Buffer____capacity(fra.me.REG[2])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_capacity", LOCATE_string, 359);
+  }
+  REGB1 = ATTR_string___Buffer____capacity(fra.me.REG[2]);
+  /* ./../lib/standard//string.nit:601 */
+  fra.me.REG[0] = BOX_NativeString((char*)raw_alloc((UNTAG_Int(REGB1) * sizeof(char))));
+  /* ./../lib/standard//string.nit:359 */
+  ATTR_string___AbstractString____items(fra.me.REG[2]) = fra.me.REG[0];
+  /* ./../lib/standard//string.nit:360 */
+  fra.me.REG[1] = CALL_string___AbstractString___items(fra.me.REG[1])(fra.me.REG[1]);
+  REGB1 = TAG_Bool(ATTR_string___AbstractString____items(fra.me.REG[2])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_items", LOCATE_string, 360);
+  }
+  fra.me.REG[0] = ATTR_string___AbstractString____items(fra.me.REG[2]);
+  REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[2])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_string, 360);
+  }
+  REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[2]);
+  REGB0 = TAG_Int(0);
+  REGB2 = TAG_Int(0);
+  /* ./../lib/standard//string.nit:587 */
+  (void)memcpy(UNBOX_NativeString(fra.me.REG[0])+UNTAG_Int(REGB2), UNBOX_NativeString(fra.me.REG[1])+UNTAG_Int(REGB0), UNTAG_Int(REGB1));;
+  stack_frame_head = fra.me.prev;
+  init_table[itpos3] = 1;
   return;
 }
-void string___String___output(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 285, LOCATE_string___String___output};
-  val_t variable0;
-    val_t variable1;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  TAG_Int(0);
-  while (true) { /*while*/
-    variable1 = ((array___AbstractArray___length_t)CALL( self,COLOR_abstract_collection___Collection___length))( self) /*AbstractArray::length*/;
-    variable1 = TAG_Bool(UNTAG_Int( variable0 /*i*/)<UNTAG_Int(variable1));
-    if (!UNTAG_Bool(variable1)) break; /* while*/
-    variable1 = ATTR_string___String____items( self) /*String::_items*/;
-    variable1 = TAG_Char(UNBOX_NativeString(variable1)[UNTAG_Int( variable0 /*i*/)]);
-    printf("%c", (unsigned char)UNTAG_Char(variable1));
-    variable0 = TAG_Int(UNTAG_Int(variable0)+UNTAG_Int( TAG_Int(1))) /*i*/;
-    continue_32: while(0);
-  }
-  break_32: while(0);
-  tracehead = trace.prev;
+void string___Buffer___with_capacity(val_t p0, val_t p1, int* init_table){
+  int itpos4 = VAL2OBJ(p0)->vft[INIT_TABLE_POS_Buffer].i;
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t tmp;
+  if (init_table[itpos4]) return;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 363;
+  fra.me.meth = LOCATE_string___Buffer___with_capacity;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 2;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  REGB0 = p1;
+  /* ./../lib/standard//string.nit:363 */
+  fra.me.REG[1] = fra.me.REG[0];
+  CALL_string___StringCapable___init(fra.me.REG[0])(fra.me.REG[0], init_table);
+  /* ./../lib/standard//string.nit:366 */
+  REGB1 = TAG_Int(0);
+  /* ./../lib/standard//kernel.nit:213 */
+  REGB1 = TAG_Bool(UNTAG_Int(REGB0)>=UNTAG_Int(REGB1));
+  /* ./../lib/standard//string.nit:366 */
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Assert failed", NULL, LOCATE_string, 366);
+  }
+  /* ./../lib/standard//string.nit:368 */
+  REGB1 = TAG_Int(1);
+  /* ./../lib/standard//kernel.nit:215 */
+  REGB1 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB1));
+  /* ./../lib/standard//string.nit:601 */
+  fra.me.REG[0] = BOX_NativeString((char*)raw_alloc((UNTAG_Int(REGB1) * sizeof(char))));
+  /* ./../lib/standard//string.nit:368 */
+  ATTR_string___AbstractString____items(fra.me.REG[1]) = fra.me.REG[0];
+  /* ./../lib/standard//string.nit:369 */
+  ATTR_string___Buffer____capacity(fra.me.REG[1]) = REGB0;
+  /* ./../lib/standard//string.nit:370 */
+  REGB0 = TAG_Int(0);
+  ATTR_array___AbstractArrayRead____length(fra.me.REG[1]) = REGB0;
+  stack_frame_head = fra.me.prev;
+  init_table[itpos4] = 1;
   return;
 }
-val_t string___String_____eqeq(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 294, LOCATE_string___String_____eqeq};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-  val_t variable3;
-  val_t variable4;
-  val_t variable5;
-    val_t variable6;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  variable1 = TAG_Bool(( variable0 /*o*/==NIT_NULL) || VAL_ISA( variable0 /*o*/, COLOR_String, ID_String)) /*cast String*/;
-  variable1 =  TAG_Bool(!UNTAG_Bool(variable1));
-  if (!UNTAG_Bool(variable1)) { /* or */
-    variable1 = TAG_Bool(IS_EQUAL_NN( variable0 /*o*/, NIT_NULL /*null*/));
-  }
-  if (UNTAG_Bool(variable1)) { /*if*/
-    variable1 =  TAG_Bool(false);
-    goto return_label33;
-  }
-  variable1 = TAG_Bool(( variable0 /*o*/==NIT_NULL) || VAL_ISA( variable0 /*o*/, COLOR_String, ID_String)) /*cast String*/;
-  if (!UNTAG_Bool(variable1)) { fprintf(stderr, "Assert%s failed", ""); fprintf(stderr, " in %s (%s:%d)\n", LOCATE_string___String_____eqeq, LOCATE_string, 297); nit_exit(1);}
-  variable2 = ((array___AbstractArray___length_t)CALL( self,COLOR_abstract_collection___Collection___length))( self) /*AbstractArray::length*/;
-  variable1 = variable2;
-  variable2 = ((array___AbstractArray___length_t)CALL( variable0 /*o*/,COLOR_abstract_collection___Collection___length))( variable0 /*o*/) /*AbstractArray::length*/;
-  variable2 = TAG_Bool((variable2)!=( variable1 /*l*/));
-  if (UNTAG_Bool(variable2)) { /*if*/
-    variable1 =  TAG_Bool(false);
-    goto return_label33;
-  }
-  variable2 =  TAG_Int(0);
-  variable4 = ATTR_string___String____items( self) /*String::_items*/;
-  variable3 = variable4;
-  variable5 = ATTR_string___String____items( variable0 /*o*/) /*String::_items*/;
-  variable4 = variable5;
-  while (true) { /*while*/
-    variable5 = TAG_Bool(UNTAG_Int( variable2 /*i*/)<UNTAG_Int( variable1 /*l*/));
-    if (!UNTAG_Bool(variable5)) break; /* while*/
-    variable5 = TAG_Char(UNBOX_NativeString( variable3 /*it*/)[UNTAG_Int( variable2 /*i*/)]);
-    variable6 = TAG_Char(UNBOX_NativeString( variable4 /*oit*/)[UNTAG_Int( variable2 /*i*/)]);
-    variable5 = TAG_Bool((variable5)!=(variable6));
-    if (UNTAG_Bool(variable5)) { /*if*/
-      variable1 =  TAG_Bool(false);
-      goto return_label33;
+val_t string___Buffer_____eqeq(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t REGB2;
+  val_t REGB3;
+  val_t REGB4;
+  val_t REGB5;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 373;
+  fra.me.meth = LOCATE_string___Buffer_____eqeq;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 2;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  /* ./../lib/standard//string.nit:375 */
+  REGB0 = TAG_Bool((fra.me.REG[1]!=NIT_NULL) && VAL_ISA(fra.me.REG[1], COLOR_Buffer, ID_Buffer)) /*cast Buffer*/;
+  REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
+  if (UNTAG_Bool(REGB0)) {
+    REGB0 = TAG_Bool(true);
+  } else {
+    REGB1 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
+    REGB0 = REGB1;
+  }
+  if (UNTAG_Bool(REGB0)) {
+    REGB0 = TAG_Bool(false);
+    goto label1;
+  }
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:377 */
+  REGB2 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
+  if (UNTAG_Bool(REGB2)) {
+    nit_abort("Reciever is null", NULL, LOCATE_string, 377);
+  }
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB2 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[1])!=NIT_NULL);
+  if (UNTAG_Bool(REGB2)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB2 = ATTR_array___AbstractArrayRead____length(fra.me.REG[1]);
+  /* ./../lib/standard//string.nit:377 */
+  REGB3 = TAG_Bool(IS_EQUAL_OO(REGB2,REGB1));
+  if (UNTAG_Bool(REGB3)) {
+  } else {
+    /* ./../lib/standard//kernel.nit:207 */
+    REGB2 = TAG_Bool((REGB2)==(REGB1));
+    /* ./../lib/standard//string.nit:377 */
+    REGB3 = REGB2;
+  }
+  REGB3 = TAG_Bool(!UNTAG_Bool(REGB3));
+  if (UNTAG_Bool(REGB3)) {
+    REGB3 = TAG_Bool(false);
+    REGB0 = REGB3;
+    goto label1;
+  }
+  /* ./../lib/standard//string.nit:378 */
+  REGB3 = TAG_Int(0);
+  /* ./../lib/standard//string.nit:379 */
+  REGB2 = TAG_Bool(ATTR_string___AbstractString____items(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB2)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_items", LOCATE_string, 379);
+  }
+  fra.me.REG[0] = ATTR_string___AbstractString____items(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:380 */
+  REGB2 = TAG_Bool(ATTR_string___AbstractString____items(fra.me.REG[1])!=NIT_NULL);
+  if (UNTAG_Bool(REGB2)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_items", LOCATE_string, 380);
+  }
+  fra.me.REG[1] = ATTR_string___AbstractString____items(fra.me.REG[1]);
+  /* ./../lib/standard//string.nit:381 */
+  while(1) {
+    /* ./../lib/standard//kernel.nit:212 */
+    REGB2 = TAG_Bool(UNTAG_Int(REGB3)<UNTAG_Int(REGB1));
+    /* ./../lib/standard//string.nit:381 */
+    if (UNTAG_Bool(REGB2)) {
+      /* ./../lib/standard//string.nit:585 */
+      REGB2 = TAG_Char(UNBOX_NativeString(fra.me.REG[0])[UNTAG_Int(REGB3)]);
+      REGB4 = TAG_Char(UNBOX_NativeString(fra.me.REG[1])[UNTAG_Int(REGB3)]);
+      /* ./../lib/standard//string.nit:382 */
+      REGB5 = TAG_Bool(IS_EQUAL_OO(REGB2,REGB4));
+      if (UNTAG_Bool(REGB5)) {
+      } else {
+        /* ./../lib/standard//kernel.nit:347 */
+        REGB4 = TAG_Bool((REGB2)==(REGB4));
+        /* ./../lib/standard//string.nit:382 */
+        REGB5 = REGB4;
+      }
+      REGB5 = TAG_Bool(!UNTAG_Bool(REGB5));
+      if (UNTAG_Bool(REGB5)) {
+        REGB5 = TAG_Bool(false);
+        REGB0 = REGB5;
+        goto label1;
+      }
+      /* ./../lib/standard//string.nit:383 */
+      REGB5 = TAG_Int(1);
+      /* ./../lib/standard//kernel.nit:215 */
+      REGB5 = TAG_Int(UNTAG_Int(REGB3)+UNTAG_Int(REGB5));
+      /* ./../lib/standard//string.nit:383 */
+      REGB3 = REGB5;
+    } else {
+      /* ./../lib/standard//string.nit:381 */
+      goto label2;
     }
-    variable2 = TAG_Int(UNTAG_Int(variable2)+UNTAG_Int( TAG_Int(1))) /*i*/;
-    continue_34: while(0);
-  }
-  break_34: while(0);
-  variable1 =  TAG_Bool(true);
-  goto return_label33;
-  return_label33: while(false);
-  tracehead = trace.prev;
-  return variable1;
-}
-val_t string___String___to_upper(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 310, LOCATE_string___String___to_upper};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-    val_t variable3;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable1 = ((array___AbstractArray___length_t)CALL( self,COLOR_abstract_collection___Collection___length))( self) /*AbstractArray::length*/;
-  variable2 = NEW_String_string___String___with_capacity(variable1); /*new String*/
-  variable1 = variable2;
-  variable0 = variable1;
-  variable1 = ((array___AbstractArray___iterator_t)CALL( self,COLOR_abstract_collection___Collection___iterator))( self) /*AbstractArray::iterator*/;
-  while (true) { /*for*/
-    variable2 = ((array___ArrayIterator___is_ok_t)CALL(variable1,COLOR_abstract_collection___Iterator___is_ok))(variable1) /*ArrayIterator::is_ok*/;
-    if (!UNTAG_Bool(variable2)) break; /*for*/
-    variable2 = ((array___ArrayIterator___item_t)CALL(variable1,COLOR_abstract_collection___Iterator___item))(variable1) /*ArrayIterator::item*/;
-    variable3 = ((kernel___Char___to_upper_t)CALL( variable2 /*i*/,COLOR_kernel___Char___to_upper))( variable2 /*i*/) /*Char::to_upper*/;
-    ((string___String___add_t)CALL( variable0 /*s*/,COLOR_abstract_collection___SimpleCollection___add))( variable0 /*s*/, variable3) /*String::add*/;
-    continue_36: while(0);
-    ((array___ArrayIterator___next_t)CALL(variable1,COLOR_abstract_collection___Iterator___next))(variable1) /*ArrayIterator::next*/;
-  }
-  break_36: while(0);
-  variable0 =  variable0 /*s*/;
-  goto return_label35;
-  return_label35: while(false);
-  tracehead = trace.prev;
-  return variable0;
-}
-val_t string___String___to_lower(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 318, LOCATE_string___String___to_lower};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-    val_t variable3;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable1 = ((array___AbstractArray___length_t)CALL( self,COLOR_abstract_collection___Collection___length))( self) /*AbstractArray::length*/;
-  variable2 = NEW_String_string___String___with_capacity(variable1); /*new String*/
-  variable1 = variable2;
-  variable0 = variable1;
-  variable1 = ((array___AbstractArray___iterator_t)CALL( self,COLOR_abstract_collection___Collection___iterator))( self) /*AbstractArray::iterator*/;
-  while (true) { /*for*/
-    variable2 = ((array___ArrayIterator___is_ok_t)CALL(variable1,COLOR_abstract_collection___Iterator___is_ok))(variable1) /*ArrayIterator::is_ok*/;
-    if (!UNTAG_Bool(variable2)) break; /*for*/
-    variable2 = ((array___ArrayIterator___item_t)CALL(variable1,COLOR_abstract_collection___Iterator___item))(variable1) /*ArrayIterator::item*/;
-    variable3 = ((kernel___Char___to_lower_t)CALL( variable2 /*i*/,COLOR_kernel___Char___to_lower))( variable2 /*i*/) /*Char::to_lower*/;
-    ((string___String___add_t)CALL( variable0 /*s*/,COLOR_abstract_collection___SimpleCollection___add))( variable0 /*s*/, variable3) /*String::add*/;
-    continue_38: while(0);
-    ((array___ArrayIterator___next_t)CALL(variable1,COLOR_abstract_collection___Iterator___next))(variable1) /*ArrayIterator::next*/;
-  }
-  break_38: while(0);
-  variable0 =  variable0 /*s*/;
-  goto return_label37;
-  return_label37: while(false);
-  tracehead = trace.prev;
-  return variable0;
+  }
+  label2: while(0);
+  /* ./../lib/standard//string.nit:385 */
+  REGB3 = TAG_Bool(true);
+  REGB0 = REGB3;
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
 }
-val_t string___String___items(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 326, LOCATE_string___String___items};
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  tracehead = trace.prev;
-  return ATTR_string___String____items( self) /*String::_items*/;
+val_t string___Buffer___capacity(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 388;
+  fra.me.meth = LOCATE_string___Buffer___capacity;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//string.nit:388 */
+  REGB0 = TAG_Bool(ATTR_string___Buffer____capacity(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_capacity", LOCATE_string, 388);
+  }
+  REGB0 = ATTR_string___Buffer____capacity(fra.me.REG[0]);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
 }
-val_t string___String___capacity(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 327, LOCATE_string___String___capacity};
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  tracehead = trace.prev;
-  return ATTR_string___String____capacity( self) /*String::_capacity*/;
+val_t string___Object___to_s(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 398;
+  fra.me.meth = LOCATE_string___Object___to_s;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//string.nit:399 */
+  fra.me.REG[0] = CALL_string___Object___inspect(fra.me.REG[0])(fra.me.REG[0]);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
 }
-val_t string___Object___to_s(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 337, LOCATE_string___Object___to_s};
-  val_t variable0;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 = ((string___Object___inspect_t)CALL( self,COLOR_string___Object___inspect))( self) /*Object::inspect*/;
-  goto return_label39;
-  return_label39: while(false);
-  tracehead = trace.prev;
-  return variable0;
+val_t string___Object___inspect(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 401;
+  fra.me.meth = LOCATE_string___Object___inspect;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//string.nit:405 */
+  fra.me.REG[0] = CALL_string___Object___inspect_head(fra.me.REG[0])(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:407 */
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
 }
-val_t string___Object___inspect(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 340, LOCATE_string___Object___inspect};
-  val_t variable0;
-  val_t variable1;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable1 = ((string___Object___inspect_head_t)CALL( self,COLOR_string___Object___inspect_head))( self) /*Object::inspect_head*/;
-  variable0 = variable1;
-  ((string___String___add_t)CALL( variable0 /*r*/,COLOR_abstract_collection___SimpleCollection___add))( variable0 /*r*/,  TAG_Char('>')) /*String::add*/;
-  variable0 =  variable0 /*r*/;
-  goto return_label40;
-  return_label40: while(false);
-  tracehead = trace.prev;
-  return variable0;
+val_t string___Object___inspect_head(val_t p0){
+  struct {struct stack_frame_t me; val_t MORE_REG[2];} fra;
+  val_t REGB0;
+  val_t tmp;
+  static val_t once_value_1; /* Once value */
+  static val_t once_value_2; /* Once value */
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 410;
+  fra.me.meth = LOCATE_string___Object___inspect_head;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 3;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//string.nit:414 */
+  REGB0 = TAG_Int(3);
+  fra.me.REG[1] = NEW_Array_array___Array___with_capacity(REGB0);
+  if (!once_value_1) {
+    fra.me.REG[2] = BOX_NativeString("<");
+    REGB0 = TAG_Int(1);
+    fra.me.REG[2] = NEW_String_string___String___with_native(fra.me.REG[2], REGB0);
+    once_value_1 = fra.me.REG[2];
+    register_static_object(&once_value_1);
+  } else fra.me.REG[2] = once_value_1;
+  fra.me.REG[2] = fra.me.REG[2];
+  CALL_abstract_collection___SimpleCollection___add(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
+  REGB0 = CALL_kernel___Object___object_id(fra.me.REG[0])(fra.me.REG[0]);
+  fra.me.REG[0] = CALL_string___Int___to_hex(REGB0)(REGB0);
+  CALL_abstract_collection___SimpleCollection___add(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
+  if (!once_value_2) {
+    fra.me.REG[0] = BOX_NativeString("");
+    REGB0 = TAG_Int(0);
+    fra.me.REG[0] = NEW_String_string___String___with_native(fra.me.REG[0], REGB0);
+    once_value_2 = fra.me.REG[0];
+    register_static_object(&once_value_2);
+  } else fra.me.REG[0] = once_value_2;
+  fra.me.REG[0] = fra.me.REG[0];
+  CALL_abstract_collection___SimpleCollection___add(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[0]);
+  fra.me.REG[1] = CALL_string___Object___to_s(fra.me.REG[1])(fra.me.REG[1]);
+  goto label3;
+  label3: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[1];
 }
-val_t string___Object___inspect_head(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 349, LOCATE_string___Object___inspect_head};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-  val_t variable3;
-  val_t variable4;
-  val_t variable5;
-  val_t variable6;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 = NEW_String_string___String___init(); /*new String*/
-  variable1 = NEW_String_string___String___with_native(BOX_NativeString("<"), TAG_Int(1)); /*new String*/
-  variable2 = variable1;
-  ((string___String___append_t)CALL(variable0,COLOR_abstract_collection___IndexedCollection___append))(variable0, variable2) /*String::append*/;
-  variable3 = TAG_Int((bigint) self);
-  variable3 = ((string___Int___to_hex_t)CALL(variable3,COLOR_string___Int___to_hex))(variable3) /*Int::to_hex*/;
-  variable4 = variable3;
-  ((string___String___append_t)CALL(variable0,COLOR_abstract_collection___IndexedCollection___append))(variable0, variable4) /*String::append*/;
-  variable5 = NEW_String_string___String___with_native(BOX_NativeString(""), TAG_Int(0)); /*new String*/
-  variable6 = variable5;
-  ((string___String___append_t)CALL(variable0,COLOR_abstract_collection___IndexedCollection___append))(variable0, variable6) /*String::append*/;
-  goto return_label41;
-  return_label41: while(false);
-  tracehead = trace.prev;
-  return variable0;
+val_t string___Object___args(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 417;
+  fra.me.meth = LOCATE_string___Object___args;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//string.nit:419 */
+  fra.me.REG[0] = CALL_kernel___Object___sys(fra.me.REG[0])(fra.me.REG[0]);
+  fra.me.REG[0] = CALL_string___Object___args(fra.me.REG[0])(fra.me.REG[0]);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
 }
-val_t string___Object___args(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 356, LOCATE_string___Object___args};
-  val_t variable0;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 = (G_sys);
-  variable0 = ((string___Sys___args_t)CALL(variable0,COLOR_string___Object___args))(variable0) /*Sys::args*/;
-  goto return_label42;
-  return_label42: while(false);
-  tracehead = trace.prev;
-  return variable0;
+val_t string___Bool___to_s(val_t p0){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t REGB0;
+  val_t tmp;
+    static val_t once_value_1; /* Once value */
+      static val_t once_value_2; /* Once value */
+    static val_t once_value_4; /* Once value */
+      static val_t once_value_5; /* Once value */
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 424;
+  fra.me.meth = LOCATE_string___Bool___to_s;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 2;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  REGB0 = p0;
+  /* ./../lib/standard//string.nit:426 */
+  if (UNTAG_Bool(REGB0)) {
+    /* ./../lib/standard//string.nit:427 */
+    if (!once_value_1) {
+      if (!once_value_2) {
+        fra.me.REG[0] = BOX_NativeString("true");
+        REGB0 = TAG_Int(4);
+        fra.me.REG[0] = NEW_String_string___String___with_native(fra.me.REG[0], REGB0);
+        once_value_2 = fra.me.REG[0];
+        register_static_object(&once_value_2);
+      } else fra.me.REG[0] = once_value_2;
+      fra.me.REG[0] = fra.me.REG[0];
+      once_value_1 = fra.me.REG[0];
+      register_static_object(&once_value_1);
+    } else fra.me.REG[0] = once_value_1;
+    fra.me.REG[0] = fra.me.REG[0];
+    goto label3;
+  } else {
+    /* ./../lib/standard//string.nit:429 */
+    if (!once_value_4) {
+      if (!once_value_5) {
+        fra.me.REG[1] = BOX_NativeString("false");
+        REGB0 = TAG_Int(5);
+        fra.me.REG[1] = NEW_String_string___String___with_native(fra.me.REG[1], REGB0);
+        once_value_5 = fra.me.REG[1];
+        register_static_object(&once_value_5);
+      } else fra.me.REG[1] = once_value_5;
+      fra.me.REG[1] = fra.me.REG[1];
+      once_value_4 = fra.me.REG[1];
+      register_static_object(&once_value_4);
+    } else fra.me.REG[1] = once_value_4;
+    fra.me.REG[1] = fra.me.REG[1];
+    fra.me.REG[0] = fra.me.REG[1];
+    goto label3;
+  }
+  label3: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
 }
-val_t string___Bool___to_s(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 363, LOCATE_string___Bool___to_s};
-  val_t variable0;
-    static val_t once_value_variable0_44; static int once_bool_variable0_44;
-    static val_t once_value_variable0_45; static int once_bool_variable0_45;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  if (UNTAG_Bool( self)) { /*if*/
-    if (once_bool_variable0_44) variable0 = once_value_variable0_44;
-    else {
-      variable0 = NEW_String_string___String___with_native(BOX_NativeString("true"), TAG_Int(4)); /*new String*/
-      once_value_variable0_44 = variable0;
-      once_bool_variable0_44 = true;
+void string___Int___fill_buffer(val_t p0, val_t p1, val_t p2, val_t p3){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t REGB2;
+  val_t REGB3;
+  val_t REGB4;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 435;
+  fra.me.meth = LOCATE_string___Int___fill_buffer;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  REGB0 = p0;
+  fra.me.REG[0] = p1;
+  REGB1 = p2;
+  REGB2 = p3;
+  /* ./../lib/standard//string.nit:441 */
+  REGB2 = TAG_Int(0);
+  /* ./../lib/standard//kernel.nit:212 */
+  REGB2 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB2));
+  /* ./../lib/standard//string.nit:441 */
+  if (UNTAG_Bool(REGB2)) {
+    /* ./../lib/standard//kernel.nit:216 */
+    REGB2 = TAG_Int(-UNTAG_Int(REGB0));
+    /* ./../lib/standard//string.nit:443 */
+    REGB3 = TAG_Int(0);
+    REGB4 = TAG_Char('-');
+    CALL_abstract_collection___Map_____braeq(fra.me.REG[0])(fra.me.REG[0], REGB3, REGB4);
+  } else {
+    /* ./../lib/standard//string.nit:444 */
+    REGB4 = TAG_Int(0);
+    REGB3 = TAG_Bool(IS_EQUAL_OO(REGB0,REGB4));
+    if (UNTAG_Bool(REGB3)) {
+    } else {
+      /* ./../lib/standard//kernel.nit:207 */
+      REGB4 = TAG_Bool((REGB0)==(REGB4));
+      /* ./../lib/standard//string.nit:444 */
+      REGB3 = REGB4;
     }
-    goto return_label43;
-  } else { /*if*/
-    if (once_bool_variable0_45) variable0 = once_value_variable0_45;
-    else {
-      variable0 = NEW_String_string___String___with_native(BOX_NativeString("false"), TAG_Int(5)); /*new String*/
-      once_value_variable0_45 = variable0;
-      once_bool_variable0_45 = true;
+    if (UNTAG_Bool(REGB3)) {
+      /* ./../lib/standard//string.nit:445 */
+      REGB3 = TAG_Int(0);
+      REGB4 = TAG_Char('0');
+      CALL_abstract_collection___Map_____braeq(fra.me.REG[0])(fra.me.REG[0], REGB3, REGB4);
+      /* ./../lib/standard//string.nit:446 */
+      goto label1;
+    } else {
+      /* ./../lib/standard//string.nit:448 */
+      REGB2 = REGB0;
     }
-    goto return_label43;
   }
-  return_label43: while(false);
-  tracehead = trace.prev;
-  return variable0;
-}
-void string___Int___fill_string(val_t  self, val_t  param0, val_t  param1, val_t  param2) {
-  struct trace_t trace = {NULL, NULL, 374, LOCATE_string___Int___fill_string};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-  val_t variable3;
-  val_t variable4;
-  val_t variable5;
-    val_t variable6;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  variable1 =  param1;
-  variable2 =  param2;
-  variable3 = TAG_Int((bigint)0) /*decl variable n*/;
-  variable4 = TAG_Bool(UNTAG_Int( self)<UNTAG_Int( TAG_Int(0)));
-  if (UNTAG_Bool(variable4)) { /*if*/
-    variable4 = TAG_Int(-UNTAG_Int( self));
-    variable3 = variable4 /*n=*/;
-    ((string___String_____braeq_t)CALL( variable0 /*s*/,COLOR_abstract_collection___Map_____braeq))( variable0 /*s*/,  TAG_Int(0),  TAG_Char('-')) /*String::[]=*/;
-  } else { /*if*/
-    variable4 = TAG_Bool(( self)==( TAG_Int(0)));
-    if (UNTAG_Bool(variable4)) { /*if*/
-      ((string___String_____braeq_t)CALL( variable0 /*s*/,COLOR_abstract_collection___Map_____braeq))( variable0 /*s*/,  TAG_Int(0),  TAG_Char('0')) /*String::[]=*/;
-      goto return_label46;
-    } else { /*if*/
-      variable3 =  self /*n=*/;
+  /* ./../lib/standard//string.nit:451 */
+  REGB0 = CALL_kernel___Int___digit_count(REGB0)(REGB0, REGB1);
+  REGB4 = TAG_Int(1);
+  /* ./../lib/standard//kernel.nit:217 */
+  REGB4 = TAG_Int(UNTAG_Int(REGB0)-UNTAG_Int(REGB4));
+  /* ./../lib/standard//string.nit:452 */
+  while(1) {
+    REGB0 = TAG_Int(0);
+    /* ./../lib/standard//kernel.nit:213 */
+    REGB0 = TAG_Bool(UNTAG_Int(REGB4)>=UNTAG_Int(REGB0));
+    /* ./../lib/standard//string.nit:452 */
+    if (UNTAG_Bool(REGB0)) {
+      REGB0 = TAG_Int(0);
+      /* ./../lib/standard//kernel.nit:214 */
+      REGB0 = TAG_Bool(UNTAG_Int(REGB2)>UNTAG_Int(REGB0));
+    } else {
+      /* ./../lib/standard//string.nit:452 */
+      REGB3 = TAG_Bool(false);
+      REGB0 = REGB3;
     }
-  }
-  variable5 = ((kernel___Int___digit_count_t)CALL( self,COLOR_kernel___Int___digit_count))( self,  variable1 /*base*/) /*Int::digit_count*/;
-  variable5 = TAG_Int(UNTAG_Int(variable5)-UNTAG_Int( TAG_Int(1)));
-  variable4 = variable5;
-  while (true) { /*while*/
-    variable5 = TAG_Bool(UNTAG_Int( variable4 /*pos*/)>=UNTAG_Int( TAG_Int(0)));
-    variable6 = variable5;
-    if (UNTAG_Bool(variable6)) { /* and */
-      variable6 = TAG_Bool(UNTAG_Int( variable3 /*n*/)>UNTAG_Int( TAG_Int(0)));
+    if (UNTAG_Bool(REGB0)) {
+      /* ./../lib/standard//kernel.nit:220 */
+      REGB0 = TAG_Int(UNTAG_Int(REGB2)%UNTAG_Int(REGB1));
+      /* ./../lib/standard//string.nit:453 */
+      REGB0 = CALL_kernel___Int___to_c(REGB0)(REGB0);
+      CALL_abstract_collection___Map_____braeq(fra.me.REG[0])(fra.me.REG[0], REGB4, REGB0);
+      /* ./../lib/standard//kernel.nit:219 */
+      REGB0 = TAG_Int(UNTAG_Int(REGB2)/UNTAG_Int(REGB1));
+      /* ./../lib/standard//string.nit:454 */
+      REGB2 = REGB0;
+      /* ./../lib/standard//string.nit:455 */
+      REGB0 = TAG_Int(1);
+      /* ./../lib/standard//kernel.nit:217 */
+      REGB0 = TAG_Int(UNTAG_Int(REGB4)-UNTAG_Int(REGB0));
+      /* ./../lib/standard//string.nit:455 */
+      REGB4 = REGB0;
+    } else {
+      /* ./../lib/standard//string.nit:452 */
+      goto label2;
     }
-    variable5 = variable6;
-    if (!UNTAG_Bool(variable5)) break; /* while*/
-    variable5 = TAG_Int(UNTAG_Int( variable3 /*n*/)%UNTAG_Int( variable1 /*base*/));
-    variable5 = ((kernel___Int___to_c_t)CALL(variable5,COLOR_kernel___Int___to_c))(variable5) /*Int::to_c*/;
-    ((string___String_____braeq_t)CALL( variable0 /*s*/,COLOR_abstract_collection___Map_____braeq))( variable0 /*s*/,  variable4 /*pos*/, variable5) /*String::[]=*/;
-    variable5 = TAG_Int(UNTAG_Int( variable3 /*n*/)/UNTAG_Int( variable1 /*base*/));
-    variable3 = variable5 /*n=*/;
-    variable4 = TAG_Int(UNTAG_Int(variable4)-UNTAG_Int( TAG_Int(1))) /*pos*/;
-    continue_47: while(0);
-  }
-  break_47: while(0);
-  return_label46: while(false);
-  tracehead = trace.prev;
+  }
+  label2: while(0);
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
   return;
 }
-val_t string___Int___to_s(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 398, LOCATE_string___Int___to_s};
-  val_t variable0;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 = ((string___Int___to_base_t)CALL( self,COLOR_string___Int___to_base))( self,  TAG_Int(10),  TAG_Bool(true)) /*Int::to_base*/;
-  goto return_label48;
-  return_label48: while(false);
-  tracehead = trace.prev;
-  return variable0;
+val_t string___Int___to_s(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t REGB2;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 459;
+  fra.me.meth = LOCATE_string___Int___to_s;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  REGB0 = p0;
+  /* ./../lib/standard//string.nit:460 */
+  REGB1 = TAG_Int(10);
+  REGB2 = TAG_Bool(true);
+  fra.me.REG[0] = CALL_string___Int___to_base(REGB0)(REGB0, REGB1, REGB2);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
+}
+val_t string___Int___to_hex(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t REGB2;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 462;
+  fra.me.meth = LOCATE_string___Int___to_hex;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  REGB0 = p0;
+  /* ./../lib/standard//string.nit:463 */
+  REGB1 = TAG_Int(16);
+  REGB2 = TAG_Bool(false);
+  fra.me.REG[0] = CALL_string___Int___to_base(REGB0)(REGB0, REGB1, REGB2);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
 }
-val_t string___Int___to_hex(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 401, LOCATE_string___Int___to_hex};
-  val_t variable0;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 = ((string___Int___to_base_t)CALL( self,COLOR_string___Int___to_base))( self,  TAG_Int(16),  TAG_Bool(false)) /*Int::to_base*/;
-  goto return_label49;
-  return_label49: while(false);
-  tracehead = trace.prev;
-  return variable0;
+val_t string___Int___to_base(val_t p0, val_t p1, val_t p2){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t REGB2;
+  val_t REGB3;
+  val_t REGB4;
+  val_t tmp;
+  static val_t once_value_1; /* Once value */
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 465;
+  fra.me.meth = LOCATE_string___Int___to_base;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  REGB0 = p0;
+  REGB1 = p1;
+  REGB2 = p2;
+  /* ./../lib/standard//string.nit:468 */
+  REGB3 = CALL_kernel___Int___digit_count(REGB0)(REGB0, REGB1);
+  /* ./../lib/standard//string.nit:469 */
+  if (!once_value_1) {
+    fra.me.REG[0] = BOX_NativeString(" ");
+    REGB4 = TAG_Int(1);
+    fra.me.REG[0] = NEW_String_string___String___with_native(fra.me.REG[0], REGB4);
+    once_value_1 = fra.me.REG[0];
+    register_static_object(&once_value_1);
+  } else fra.me.REG[0] = once_value_1;
+  fra.me.REG[0] = fra.me.REG[0];
+  fra.me.REG[0] = CALL_string___String_____star(fra.me.REG[0])(fra.me.REG[0], REGB3);
+  fra.me.REG[0] = NEW_Buffer_string___Buffer___from(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:470 */
+  CALL_string___Int___fill_buffer(REGB0)(REGB0, fra.me.REG[0], REGB1, REGB2);
+  /* ./../lib/standard//string.nit:471 */
+  fra.me.REG[0] = CALL_string___Object___to_s(fra.me.REG[0])(fra.me.REG[0]);
+  goto label2;
+  label2: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
 }
-val_t string___Int___to_base(val_t  self, val_t  param0, val_t  param1) {
-  struct trace_t trace = {NULL, NULL, 404, LOCATE_string___Int___to_base};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-  val_t variable3;
-  val_t variable4;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  variable1 =  param1;
-  variable3 = ((kernel___Int___digit_count_t)CALL( self,COLOR_kernel___Int___digit_count))( self,  variable0 /*base*/) /*Int::digit_count*/;
-  variable2 = variable3;
-  variable4 = NEW_String_string___String___filled_with( TAG_Char(' '),  variable2 /*l*/); /*new String*/
-  variable3 = variable4;
-  ((string___Int___fill_string_t)CALL( self,COLOR_string___Int___fill_string))( self,  variable3 /*s*/,  variable0 /*base*/,  variable1 /*signed*/) /*Int::fill_string*/;
-  variable2 =  variable3 /*s*/;
-  goto return_label50;
-  return_label50: while(false);
-  tracehead = trace.prev;
-  return variable2;
+val_t string___Float___to_s(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 476;
+  fra.me.meth = LOCATE_string___Float___to_s;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//string.nit:476 */
+  REGB0 = TAG_Int(6);
+  fra.me.REG[0] = CALL_string___Float___to_precision(fra.me.REG[0])(fra.me.REG[0], REGB0);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
 }
-val_t string___Float___to_s(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 415, LOCATE_string___Float___to_s};
-  val_t variable0;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 = ((string___Float___to_precision_t)CALL( self,COLOR_string___Float___to_precision))( self,  TAG_Int(6)) /*Float::to_precision*/;
-  goto return_label51;
-  return_label51: while(false);
-  tracehead = trace.prev;
-  return variable0;
+val_t string___Float___to_precision(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[3];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t REGB2;
+  val_t tmp;
+  static val_t once_value_3; /* Once value */
+  static val_t once_value_4; /* Once value */
+  static val_t once_value_5; /* Once value */
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 478;
+  fra.me.meth = LOCATE_string___Float___to_precision;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 4;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[3] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  REGB0 = p1;
+  /* ./../lib/standard//string.nit:481 */
+  REGB1 = TAG_Int(0);
+  REGB2 = TAG_Bool(IS_EQUAL_OO(REGB0,REGB1));
+  if (UNTAG_Bool(REGB2)) {
+  } else {
+    /* ./../lib/standard//kernel.nit:207 */
+    REGB1 = TAG_Bool((REGB0)==(REGB1));
+    /* ./../lib/standard//string.nit:481 */
+    REGB2 = REGB1;
+  }
+  if (UNTAG_Bool(REGB2)) {
+    /* ./../lib/standard//kernel.nit:196 */
+    REGB2 = TAG_Int((bigint)UNBOX_Float(fra.me.REG[0]));
+    /* ./../lib/standard//string.nit:481 */
+    fra.me.REG[1] = CALL_string___Object___to_s(REGB2)(REGB2);
+    goto label1;
+  }
+  /* ./../lib/standard//kernel.nit:196 */
+  REGB2 = TAG_Int((bigint)UNBOX_Float(fra.me.REG[0]));
+  /* ./../lib/standard//string.nit:484 */
+  fra.me.REG[2] = BOX_Float(1.0);
+  /* ./../lib/standard//string.nit:485 */
+  while(1) {
+    REGB1 = TAG_Int(0);
+    /* ./../lib/standard//kernel.nit:214 */
+    REGB1 = TAG_Bool(UNTAG_Int(REGB0)>UNTAG_Int(REGB1));
+    /* ./../lib/standard//string.nit:485 */
+    if (UNTAG_Bool(REGB1)) {
+      /* ./../lib/standard//string.nit:486 */
+      fra.me.REG[3] = BOX_Float(10.0);
+      /* ./../lib/standard//kernel.nit:193 */
+      fra.me.REG[3] = BOX_Float(UNBOX_Float(fra.me.REG[2])*UNBOX_Float(fra.me.REG[3]));
+      /* ./../lib/standard//string.nit:486 */
+      fra.me.REG[2] = fra.me.REG[3];
+      /* ./../lib/standard//string.nit:487 */
+      REGB1 = TAG_Int(1);
+      /* ./../lib/standard//kernel.nit:217 */
+      REGB1 = TAG_Int(UNTAG_Int(REGB0)-UNTAG_Int(REGB1));
+      /* ./../lib/standard//string.nit:487 */
+      REGB0 = REGB1;
+    } else {
+      /* ./../lib/standard//string.nit:485 */
+      goto label2;
+    }
+  }
+  label2: while(0);
+  /* ./../lib/standard//kernel.nit:224 */
+  fra.me.REG[3] = BOX_Float((float)UNTAG_Int(REGB2));
+  /* ./../lib/standard//kernel.nit:192 */
+  fra.me.REG[3] = BOX_Float(UNBOX_Float(fra.me.REG[0])-UNBOX_Float(fra.me.REG[3]));
+  /* ./../lib/standard//kernel.nit:193 */
+  fra.me.REG[2] = BOX_Float(UNBOX_Float(fra.me.REG[3])*UNBOX_Float(fra.me.REG[2]));
+  /* ./../lib/standard//kernel.nit:196 */
+  REGB0 = TAG_Int((bigint)UNBOX_Float(fra.me.REG[2]));
+  /* ./../lib/standard//string.nit:490 */
+  REGB1 = TAG_Int(5);
+  fra.me.REG[2] = NEW_Array_array___Array___with_capacity(REGB1);
+  if (!once_value_3) {
+    fra.me.REG[3] = BOX_NativeString("");
+    REGB1 = TAG_Int(0);
+    fra.me.REG[3] = NEW_String_string___String___with_native(fra.me.REG[3], REGB1);
+    once_value_3 = fra.me.REG[3];
+    register_static_object(&once_value_3);
+  } else fra.me.REG[3] = once_value_3;
+  fra.me.REG[3] = fra.me.REG[3];
+  CALL_abstract_collection___SimpleCollection___add(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[3]);
+  fra.me.REG[3] = CALL_string___Object___to_s(REGB2)(REGB2);
+  CALL_abstract_collection___SimpleCollection___add(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[3]);
+  if (!once_value_4) {
+    fra.me.REG[3] = BOX_NativeString(".");
+    REGB2 = TAG_Int(1);
+    fra.me.REG[3] = NEW_String_string___String___with_native(fra.me.REG[3], REGB2);
+    once_value_4 = fra.me.REG[3];
+    register_static_object(&once_value_4);
+  } else fra.me.REG[3] = once_value_4;
+  fra.me.REG[3] = fra.me.REG[3];
+  CALL_abstract_collection___SimpleCollection___add(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[3]);
+  fra.me.REG[3] = CALL_string___Object___to_s(REGB0)(REGB0);
+  CALL_abstract_collection___SimpleCollection___add(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[3]);
+  if (!once_value_5) {
+    fra.me.REG[3] = BOX_NativeString("");
+    REGB0 = TAG_Int(0);
+    fra.me.REG[3] = NEW_String_string___String___with_native(fra.me.REG[3], REGB0);
+    once_value_5 = fra.me.REG[3];
+    register_static_object(&once_value_5);
+  } else fra.me.REG[3] = once_value_5;
+  fra.me.REG[3] = fra.me.REG[3];
+  CALL_abstract_collection___SimpleCollection___add(fra.me.REG[2])(fra.me.REG[2], fra.me.REG[3]);
+  fra.me.REG[2] = CALL_string___Object___to_s(fra.me.REG[2])(fra.me.REG[2]);
+  fra.me.REG[1] = fra.me.REG[2];
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[1];
 }
-val_t string___Float___to_precision(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 417, LOCATE_string___Float___to_precision};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-  val_t variable3;
-  val_t variable4;
-  val_t variable5;
-  val_t variable6;
-  val_t variable7;
-  val_t variable8;
-  val_t variable9;
-  val_t variable10;
-  val_t variable11;
-  val_t variable12;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  variable1 = TAG_Bool(( variable0 /*nb*/)==( TAG_Int(0)));
-  if (UNTAG_Bool(variable1)) { /*if*/
-    variable1 = TAG_Int((bigint)UNBOX_Float( self));
-    variable1 = ((string___Int___to_s_t)CALL(variable1,COLOR_string___Object___to_s))(variable1) /*Int::to_s*/;
-    goto return_label52;
-  }
-  variable2 = TAG_Int((bigint)UNBOX_Float( self));
-  variable1 = variable2;
-  variable3 = BOX_Float(1.0);
-  variable2 = variable3;
-  while (true) { /*while*/
-    variable3 = TAG_Bool(UNTAG_Int( variable0 /*nb*/)>UNTAG_Int( TAG_Int(0)));
-    if (!UNTAG_Bool(variable3)) break; /* while*/
-    variable3 = BOX_Float(10.0);
-    variable3 = BOX_Float(UNBOX_Float( variable2 /*dec*/)*UNBOX_Float(variable3));
-    variable2 = variable3 /*dec=*/;
-    variable0 = TAG_Int(UNTAG_Int(variable0)-UNTAG_Int( TAG_Int(1))) /*nb*/;
-    continue_53: while(0);
-  }
-  break_53: while(0);
-  variable4 = BOX_Float((float)UNTAG_Int( variable1 /*i*/));
-  variable4 = BOX_Float(UNBOX_Float( self)-UNBOX_Float(variable4));
-  variable4 = BOX_Float(UNBOX_Float(variable4)*UNBOX_Float( variable2 /*dec*/));
-  variable4 = TAG_Int((bigint)UNBOX_Float(variable4));
-  variable3 = variable4;
-  variable4 = NEW_String_string___String___init(); /*new String*/
-  variable5 = NEW_String_string___String___with_native(BOX_NativeString(""), TAG_Int(0)); /*new String*/
-  variable6 = variable5;
-  ((string___String___append_t)CALL(variable4,COLOR_abstract_collection___IndexedCollection___append))(variable4, variable6) /*String::append*/;
-  variable7 =  variable1 /*i*/;
-  variable7 = ((string___String___to_s_t)CALL(variable7,COLOR_string___Object___to_s))(variable7) /*String::to_s*/;
-  ((string___String___append_t)CALL(variable4,COLOR_abstract_collection___IndexedCollection___append))(variable4, variable7) /*String::append*/;
-  variable8 = NEW_String_string___String___with_native(BOX_NativeString("."), TAG_Int(1)); /*new String*/
-  variable9 = variable8;
-  ((string___String___append_t)CALL(variable4,COLOR_abstract_collection___IndexedCollection___append))(variable4, variable9) /*String::append*/;
-  variable10 =  variable3 /*d*/;
-  variable10 = ((string___String___to_s_t)CALL(variable10,COLOR_string___Object___to_s))(variable10) /*String::to_s*/;
-  ((string___String___append_t)CALL(variable4,COLOR_abstract_collection___IndexedCollection___append))(variable4, variable10) /*String::append*/;
-  variable11 = NEW_String_string___String___with_native(BOX_NativeString(""), TAG_Int(0)); /*new String*/
-  variable12 = variable11;
-  ((string___String___append_t)CALL(variable4,COLOR_abstract_collection___IndexedCollection___append))(variable4, variable12) /*String::append*/;
-  variable1 = variable4;
-  goto return_label52;
-  return_label52: while(false);
-  tracehead = trace.prev;
-  return variable1;
+val_t string___Char___to_s(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 495;
+  fra.me.meth = LOCATE_string___Char___to_s;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  REGB0 = p0;
+  /* ./../lib/standard//string.nit:497 */
+  REGB1 = TAG_Int(1);
+  fra.me.REG[0] = NEW_Buffer_string___Buffer___with_capacity(REGB1);
+  /* ./../lib/standard//string.nit:498 */
+  REGB1 = TAG_Int(0);
+  CALL_abstract_collection___Map_____braeq(fra.me.REG[0])(fra.me.REG[0], REGB1, REGB0);
+  /* ./../lib/standard//string.nit:499 */
+  fra.me.REG[0] = CALL_string___Object___to_s(fra.me.REG[0])(fra.me.REG[0]);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
 }
-val_t string___Char___to_s(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 434, LOCATE_string___Char___to_s};
-  val_t variable0;
-  val_t variable1;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable1 = NEW_String_string___String___with_capacity( TAG_Int(1)); /*new String*/
-  variable0 = variable1;
-  ((string___String_____braeq_t)CALL( variable0 /*s*/,COLOR_abstract_collection___Map_____braeq))( variable0 /*s*/,  TAG_Int(0),  self) /*String::[]=*/;
-  variable0 =  variable0 /*s*/;
-  goto return_label54;
-  return_label54: while(false);
-  tracehead = trace.prev;
-  return variable0;
+val_t string___Collection___to_s(val_t p0){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 504;
+  fra.me.meth = LOCATE_string___Collection___to_s;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 2;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//string.nit:507 */
+  fra.me.REG[1] = NEW_Buffer_string___Buffer___init();
+  CALL_abstract_collection___Collection___iterate(fra.me.REG[0])(fra.me.REG[0], (&(fra.me)), ((fun_t)OC_string___Collection___to_s_1));
+  /* ./../lib/standard//string.nit:509 */
+  fra.me.REG[1] = CALL_string___Object___to_s(fra.me.REG[1])(fra.me.REG[1]);
+  goto label2;
+  label2: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[1];
 }
-val_t string___Collection___to_s(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 443, LOCATE_string___Collection___to_s};
-  val_t variable0;
-  val_t variable1;
-    val_t variable2;
-    val_t variable3;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable1 = NEW_String_string___String___init(); /*new String*/
-  variable0 = variable1;
-  variable1 = ((abstract_collection___Collection___iterator_t)CALL( self,COLOR_abstract_collection___Collection___iterator))( self) /*Collection::iterator*/;
-  while (true) { /*for*/
-    variable2 = ((abstract_collection___Iterator___is_ok_t)CALL(variable1,COLOR_abstract_collection___Iterator___is_ok))(variable1) /*Iterator::is_ok*/;
-    if (!UNTAG_Bool(variable2)) break; /*for*/
-    variable2 = ((abstract_collection___Iterator___item_t)CALL(variable1,COLOR_abstract_collection___Iterator___item))(variable1) /*Iterator::item*/;
-    variable3 = TAG_Bool(!UNTAG_Bool(TAG_Bool(( variable2 /*e*/ ==  NIT_NULL /*null*/) || (( variable2 /*e*/ != NIT_NULL) && ((((kernel___Object_____eqeq_t)CALL( variable2 /*e*/,COLOR_kernel___Object_____eqeq))==kernel___Object_____eqeq)?(IS_EQUAL_NN( variable2 /*e*/, NIT_NULL /*null*/)):(UNTAG_Bool(((kernel___Object_____eqeq_t)CALL( variable2 /*e*/,COLOR_kernel___Object_____eqeq))( variable2 /*e*/,  NIT_NULL /*null*/) /*Object::==*/)))))));
-    if (UNTAG_Bool(variable3)) { /*if*/
-      variable3 = ((string___Object___to_s_t)CALL( variable2 /*e*/,COLOR_string___Object___to_s))( variable2 /*e*/) /*Object::to_s*/;
-      ((string___String___append_t)CALL( variable0 /*s*/,COLOR_abstract_collection___IndexedCollection___append))( variable0 /*s*/, variable3) /*String::append*/;
+  void OC_string___Collection___to_s_1(struct stack_frame_t *closctx, val_t p0, struct stack_frame_t *closctx_param, fun_t clos_fun0){
+    struct {struct stack_frame_t me;} fra;
+    val_t REGB0;
+    val_t REGB1;
+    fun_t CREG[1];
+    val_t tmp;
+    /* ./../lib/standard//string.nit:508 */
+    fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+    fra.me.file = LOCATE_string;
+    fra.me.line = 0;
+    fra.me.meth = LOCATE_string___Collection___to_s;
+    fra.me.has_broke = 0;
+    fra.me.REG_size = 1;
+    fra.me.REG[0] = NIT_NULL;
+    fra.me.closure_ctx = closctx_param;
+    fra.me.closure_funs = CREG;
+    fra.me.REG[0] = p0;
+    CREG[0] = clos_fun0;
+    REGB0 = TAG_Bool(fra.me.REG[0]==NIT_NULL);
+    if (UNTAG_Bool(REGB0)) {
+    } else {
+      REGB1 = TAG_Bool(fra.me.REG[0]==NIT_NULL);
+      if (UNTAG_Bool(REGB1)) {
+        REGB1 = TAG_Bool(false);
+        REGB0 = REGB1;
+      } else {
+        REGB1 = CALL_kernel___Object_____eqeq(fra.me.REG[0])(fra.me.REG[0], NIT_NULL);
+        REGB0 = REGB1;
+      }
+    }
+    REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
+    if (UNTAG_Bool(REGB0)) {
+      REGB0 = TAG_Bool(fra.me.REG[0]==NIT_NULL);
+      if (UNTAG_Bool(REGB0)) {
+        nit_abort("Reciever is null", NULL, LOCATE_string, 508);
+      }
+      fra.me.REG[0] = CALL_string___Object___to_s(fra.me.REG[0])(fra.me.REG[0]);
+      CALL_abstract_collection___Sequence___append(closctx->REG[1])(closctx->REG[1], fra.me.REG[0]);
     }
-    continue_56: while(0);
-    ((abstract_collection___Iterator___next_t)CALL(variable1,COLOR_abstract_collection___Iterator___next))(variable1) /*Iterator::next*/;
-  }
-  break_56: while(0);
-  variable0 =  variable0 /*s*/;
-  goto return_label55;
-  return_label55: while(false);
-  tracehead = trace.prev;
-  return variable0;
+    stack_frame_head = fra.me.prev;
+    return;
+  }
+val_t string___Collection___join(val_t p0, val_t p1){
+  struct {struct stack_frame_t me; val_t MORE_REG[5];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t tmp;
+    static val_t once_value_1; /* Once value */
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 512;
+  fra.me.meth = LOCATE_string___Collection___join;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 6;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[3] = NIT_NULL;
+  fra.me.REG[4] = NIT_NULL;
+  fra.me.REG[5] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  /* ./../lib/standard//string.nit:515 */
+  REGB0 = CALL_abstract_collection___Collection___is_empty(fra.me.REG[0])(fra.me.REG[0]);
+  if (UNTAG_Bool(REGB0)) {
+    if (!once_value_1) {
+      fra.me.REG[2] = BOX_NativeString("");
+      REGB0 = TAG_Int(0);
+      fra.me.REG[2] = NEW_String_string___String___with_native(fra.me.REG[2], REGB0);
+      once_value_1 = fra.me.REG[2];
+      register_static_object(&once_value_1);
+    } else fra.me.REG[2] = once_value_1;
+    fra.me.REG[2] = fra.me.REG[2];
+    goto label2;
+  }
+  /* ./../lib/standard//string.nit:517 */
+  fra.me.REG[3] = NEW_Buffer_string___Buffer___init();
+  /* ./../lib/standard//string.nit:520 */
+  fra.me.REG[0] = CALL_abstract_collection___Collection___iterator(fra.me.REG[0])(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:521 */
+  fra.me.REG[4] = CALL_abstract_collection___Iterator___item(fra.me.REG[0])(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:522 */
+  REGB0 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    REGB1 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
+    if (UNTAG_Bool(REGB1)) {
+      REGB1 = TAG_Bool(false);
+      REGB0 = REGB1;
+    } else {
+      REGB1 = CALL_kernel___Object_____eqeq(fra.me.REG[4])(fra.me.REG[4], NIT_NULL);
+      REGB0 = REGB1;
+    }
+  }
+  REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
+  if (UNTAG_Bool(REGB0)) {
+    REGB0 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
+    if (UNTAG_Bool(REGB0)) {
+      nit_abort("Reciever is null", NULL, LOCATE_string, 522);
+    }
+    fra.me.REG[5] = CALL_string___Object___to_s(fra.me.REG[4])(fra.me.REG[4]);
+    CALL_abstract_collection___Sequence___append(fra.me.REG[3])(fra.me.REG[3], fra.me.REG[5]);
+  }
+  /* ./../lib/standard//string.nit:525 */
+  CALL_abstract_collection___Iterator___next(fra.me.REG[0])(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:526 */
+  while(1) {
+    REGB0 = CALL_abstract_collection___Iterator___is_ok(fra.me.REG[0])(fra.me.REG[0]);
+    if (UNTAG_Bool(REGB0)) {
+      /* ./../lib/standard//string.nit:527 */
+      CALL_abstract_collection___Sequence___append(fra.me.REG[3])(fra.me.REG[3], fra.me.REG[1]);
+      /* ./../lib/standard//string.nit:528 */
+      fra.me.REG[5] = CALL_abstract_collection___Iterator___item(fra.me.REG[0])(fra.me.REG[0]);
+      fra.me.REG[4] = fra.me.REG[5];
+      /* ./../lib/standard//string.nit:529 */
+      REGB0 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
+      if (UNTAG_Bool(REGB0)) {
+      } else {
+        REGB1 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
+        if (UNTAG_Bool(REGB1)) {
+          REGB1 = TAG_Bool(false);
+          REGB0 = REGB1;
+        } else {
+          REGB1 = CALL_kernel___Object_____eqeq(fra.me.REG[4])(fra.me.REG[4], NIT_NULL);
+          REGB0 = REGB1;
+        }
+      }
+      REGB0 = TAG_Bool(!UNTAG_Bool(REGB0));
+      if (UNTAG_Bool(REGB0)) {
+        REGB0 = TAG_Bool(fra.me.REG[4]==NIT_NULL);
+        if (UNTAG_Bool(REGB0)) {
+          nit_abort("Reciever is null", NULL, LOCATE_string, 529);
+        }
+        fra.me.REG[5] = CALL_string___Object___to_s(fra.me.REG[4])(fra.me.REG[4]);
+        CALL_abstract_collection___Sequence___append(fra.me.REG[3])(fra.me.REG[3], fra.me.REG[5]);
+      }
+      /* ./../lib/standard//string.nit:530 */
+      CALL_abstract_collection___Iterator___next(fra.me.REG[0])(fra.me.REG[0]);
+    } else {
+      /* ./../lib/standard//string.nit:526 */
+      goto label3;
+    }
+  }
+  label3: while(0);
+  /* ./../lib/standard//string.nit:532 */
+  fra.me.REG[3] = CALL_string___Object___to_s(fra.me.REG[3])(fra.me.REG[3]);
+  fra.me.REG[2] = fra.me.REG[3];
+  goto label2;
+  label2: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[2];
 }
-val_t string___Collection___join(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 451, LOCATE_string___Collection___join};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-  val_t variable3;
-  val_t variable4;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  variable1 = ((abstract_collection___Collection___is_empty_t)CALL( self,COLOR_abstract_collection___Collection___is_empty))( self) /*Collection::is_empty*/;
-  if (UNTAG_Bool(variable1)) { /*if*/
-    variable1 = NEW_String_string___String___with_native(BOX_NativeString(""), TAG_Int(0)); /*new String*/
-    goto return_label57;
-  }
-  variable2 = NEW_String_string___String___init(); /*new String*/
-  variable1 = variable2;
-  variable3 = ((abstract_collection___Collection___iterator_t)CALL( self,COLOR_abstract_collection___Collection___iterator))( self) /*Collection::iterator*/;
-  variable2 = variable3;
-  variable4 = ((abstract_collection___Iterator___item_t)CALL( variable2 /*i*/,COLOR_abstract_collection___Iterator___item))( variable2 /*i*/) /*Iterator::item*/;
-  variable3 = variable4;
-  variable4 = TAG_Bool(!UNTAG_Bool(TAG_Bool(( variable3 /*e*/ ==  NIT_NULL /*null*/) || (( variable3 /*e*/ != NIT_NULL) && ((((kernel___Object_____eqeq_t)CALL( variable3 /*e*/,COLOR_kernel___Object_____eqeq))==kernel___Object_____eqeq)?(IS_EQUAL_NN( variable3 /*e*/, NIT_NULL /*null*/)):(UNTAG_Bool(((kernel___Object_____eqeq_t)CALL( variable3 /*e*/,COLOR_kernel___Object_____eqeq))( variable3 /*e*/,  NIT_NULL /*null*/) /*Object::==*/)))))));
-  if (UNTAG_Bool(variable4)) { /*if*/
-    variable4 = ((string___Object___to_s_t)CALL( variable3 /*e*/,COLOR_string___Object___to_s))( variable3 /*e*/) /*Object::to_s*/;
-    ((string___String___append_t)CALL( variable1 /*s*/,COLOR_abstract_collection___IndexedCollection___append))( variable1 /*s*/, variable4) /*String::append*/;
-  }
-  ((abstract_collection___Iterator___next_t)CALL( variable2 /*i*/,COLOR_abstract_collection___Iterator___next))( variable2 /*i*/) /*Iterator::next*/;
-  while (true) { /*while*/
-    variable4 = ((abstract_collection___Iterator___is_ok_t)CALL( variable2 /*i*/,COLOR_abstract_collection___Iterator___is_ok))( variable2 /*i*/) /*Iterator::is_ok*/;
-    if (!UNTAG_Bool(variable4)) break; /* while*/
-    ((string___String___append_t)CALL( variable1 /*s*/,COLOR_abstract_collection___IndexedCollection___append))( variable1 /*s*/,  variable0 /*sep*/) /*String::append*/;
-    variable4 = ((abstract_collection___Iterator___item_t)CALL( variable2 /*i*/,COLOR_abstract_collection___Iterator___item))( variable2 /*i*/) /*Iterator::item*/;
-    variable3 = variable4 /*e=*/;
-    variable4 = TAG_Bool(!UNTAG_Bool(TAG_Bool(( variable3 /*e*/ ==  NIT_NULL /*null*/) || (( variable3 /*e*/ != NIT_NULL) && ((((kernel___Object_____eqeq_t)CALL( variable3 /*e*/,COLOR_kernel___Object_____eqeq))==kernel___Object_____eqeq)?(IS_EQUAL_NN( variable3 /*e*/, NIT_NULL /*null*/)):(UNTAG_Bool(((kernel___Object_____eqeq_t)CALL( variable3 /*e*/,COLOR_kernel___Object_____eqeq))( variable3 /*e*/,  NIT_NULL /*null*/) /*Object::==*/)))))));
-    if (UNTAG_Bool(variable4)) { /*if*/
-      variable4 = ((string___Object___to_s_t)CALL( variable3 /*e*/,COLOR_string___Object___to_s))( variable3 /*e*/) /*Object::to_s*/;
-      ((string___String___append_t)CALL( variable1 /*s*/,COLOR_abstract_collection___IndexedCollection___append))( variable1 /*s*/, variable4) /*String::append*/;
+val_t string___Array___to_s(val_t p0){
+  struct {struct stack_frame_t me; val_t MORE_REG[2];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t REGB2;
+  val_t REGB3;
+  val_t REGB4;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 537;
+  fra.me.meth = LOCATE_string___Array___to_s;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 3;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//string.nit:540 */
+  fra.me.REG[1] = NEW_Buffer_string___Buffer___init();
+  /* ./../lib/standard//string.nit:541 */
+  REGB0 = TAG_Int(0);
+  /* ./../lib/standard//collection//array.nit:23 */
+  REGB1 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[0])!=NIT_NULL);
+  if (UNTAG_Bool(REGB1)) {
+  } else {
+    nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 23);
+  }
+  REGB1 = ATTR_array___AbstractArrayRead____length(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:543 */
+  while(1) {
+    /* ./../lib/standard//kernel.nit:212 */
+    REGB2 = TAG_Bool(UNTAG_Int(REGB0)<UNTAG_Int(REGB1));
+    /* ./../lib/standard//string.nit:543 */
+    if (UNTAG_Bool(REGB2)) {
+      /* ./../lib/standard//collection//array.nit:243 */
+      fra.me.REG[2] = fra.me.REG[0];
+      REGB2 = REGB0;
+      /* ./../lib/standard//collection//array.nit:245 */
+      REGB3 = TAG_Int(0);
+      /* ./../lib/standard//kernel.nit:213 */
+      REGB3 = TAG_Bool(UNTAG_Int(REGB2)>=UNTAG_Int(REGB3));
+      /* ./../lib/standard//collection//array.nit:245 */
+      if (UNTAG_Bool(REGB3)) {
+        REGB3 = TAG_Bool(ATTR_array___AbstractArrayRead____length(fra.me.REG[2])!=NIT_NULL);
+        if (UNTAG_Bool(REGB3)) {
+        } else {
+          nit_abort("Uninitialized attribute %s", "_length", LOCATE_array, 245);
+        }
+        REGB3 = ATTR_array___AbstractArrayRead____length(fra.me.REG[2]);
+        /* ./../lib/standard//kernel.nit:212 */
+        REGB3 = TAG_Bool(UNTAG_Int(REGB2)<UNTAG_Int(REGB3));
+      } else {
+        /* ./../lib/standard//collection//array.nit:245 */
+        REGB4 = TAG_Bool(false);
+        REGB3 = REGB4;
+      }
+      if (UNTAG_Bool(REGB3)) {
+      } else {
+        nit_abort("Assert %s  failed", "'index'", LOCATE_array, 245);
+      }
+      /* ./../lib/standard//collection//array.nit:246 */
+      fra.me.REG[2] = ATTR_array___Array____items(fra.me.REG[2]);
+      REGB3 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
+      if (UNTAG_Bool(REGB3)) {
+        nit_abort("Reciever is null", NULL, LOCATE_array, 246);
+      }
+      /* ./../lib/standard//collection//array.nit:654 */
+      fra.me.REG[2] = ((Nit_NativeArray)fra.me.REG[2])->val[UNTAG_Int(REGB2)];
+      /* ./../lib/standard//collection//array.nit:246 */
+      goto label1;
+      label1: while(0);
+      /* ./../lib/standard//string.nit:545 */
+      REGB2 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
+      if (UNTAG_Bool(REGB2)) {
+      } else {
+        REGB3 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
+        if (UNTAG_Bool(REGB3)) {
+          REGB3 = TAG_Bool(false);
+          REGB2 = REGB3;
+        } else {
+          REGB3 = CALL_kernel___Object_____eqeq(fra.me.REG[2])(fra.me.REG[2], NIT_NULL);
+          REGB2 = REGB3;
+        }
+      }
+      REGB2 = TAG_Bool(!UNTAG_Bool(REGB2));
+      if (UNTAG_Bool(REGB2)) {
+        REGB2 = TAG_Bool(fra.me.REG[2]==NIT_NULL);
+        if (UNTAG_Bool(REGB2)) {
+          nit_abort("Reciever is null", NULL, LOCATE_string, 545);
+        }
+        fra.me.REG[2] = CALL_string___Object___to_s(fra.me.REG[2])(fra.me.REG[2]);
+        CALL_abstract_collection___Sequence___append(fra.me.REG[1])(fra.me.REG[1], fra.me.REG[2]);
+      }
+      /* ./../lib/standard//string.nit:546 */
+      REGB2 = TAG_Int(1);
+      /* ./../lib/standard//kernel.nit:215 */
+      REGB2 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB2));
+      /* ./../lib/standard//string.nit:546 */
+      REGB0 = REGB2;
+    } else {
+      /* ./../lib/standard//string.nit:543 */
+      goto label2;
     }
-    ((abstract_collection___Iterator___next_t)CALL( variable2 /*i*/,COLOR_abstract_collection___Iterator___next))( variable2 /*i*/) /*Iterator::next*/;
-    continue_58: while(0);
-  }
-  break_58: while(0);
-  variable1 =  variable1 /*s*/;
-  goto return_label57;
-  return_label57: while(false);
-  tracehead = trace.prev;
-  return variable1;
+  }
+  label2: while(0);
+  /* ./../lib/standard//string.nit:548 */
+  fra.me.REG[1] = CALL_string___Object___to_s(fra.me.REG[1])(fra.me.REG[1]);
+  goto label3;
+  label3: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[1];
 }
-val_t string___Map___map_join(val_t  self, val_t  param0, val_t  param1) {
-  struct trace_t trace = {NULL, NULL, 476, LOCATE_string___Map___map_join};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-  val_t variable3;
-  val_t variable4;
-  val_t variable5;
-  val_t variable6;
-    val_t variable7;
-    val_t variable8;
-    val_t variable9;
-    val_t variable10;
-    val_t variable11;
-    val_t variable12;
-    val_t variable13;
-    val_t variable14;
-    val_t variable15;
-    val_t variable16;
-    val_t variable17;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  param0;
-  variable1 =  param1;
-  variable2 = ((abstract_collection___Collection___is_empty_t)CALL( self,COLOR_abstract_collection___Collection___is_empty))( self) /*Collection::is_empty*/;
-  if (UNTAG_Bool(variable2)) { /*if*/
-    variable2 = NEW_String_string___String___with_native(BOX_NativeString(""), TAG_Int(0)); /*new String*/
-    goto return_label59;
-  }
-  variable3 = NEW_String_string___String___init(); /*new String*/
-  variable2 = variable3;
-  variable4 = ((abstract_collection___Map___iterator_t)CALL( self,COLOR_abstract_collection___Collection___iterator))( self) /*Map::iterator*/;
-  variable3 = variable4;
-  variable5 = ((abstract_collection___MapIterator___key_t)CALL( variable3 /*i*/,COLOR_abstract_collection___MapIterator___key))( variable3 /*i*/) /*MapIterator::key*/;
-  variable4 = variable5;
-  variable6 = ((abstract_collection___Iterator___item_t)CALL( variable3 /*i*/,COLOR_abstract_collection___Iterator___item))( variable3 /*i*/) /*Iterator::item*/;
-  variable5 = variable6;
-  variable6 = TAG_Bool(!UNTAG_Bool(TAG_Bool(( variable5 /*e*/ ==  NIT_NULL /*null*/) || (( variable5 /*e*/ != NIT_NULL) && ((((kernel___Object_____eqeq_t)CALL( variable5 /*e*/,COLOR_kernel___Object_____eqeq))==kernel___Object_____eqeq)?(IS_EQUAL_NN( variable5 /*e*/, NIT_NULL /*null*/)):(UNTAG_Bool(((kernel___Object_____eqeq_t)CALL( variable5 /*e*/,COLOR_kernel___Object_____eqeq))( variable5 /*e*/,  NIT_NULL /*null*/) /*Object::==*/)))))));
-  if (UNTAG_Bool(variable6)) { /*if*/
-    variable6 = NEW_String_string___String___init(); /*new String*/
-    variable7 = NEW_String_string___String___with_native(BOX_NativeString(""), TAG_Int(0)); /*new String*/
-    variable8 = variable7;
-    ((string___String___append_t)CALL(variable6,COLOR_abstract_collection___IndexedCollection___append))(variable6, variable8) /*String::append*/;
-    variable9 =  variable4 /*k*/;
-    variable9 = ((string___String___to_s_t)CALL(variable9,COLOR_string___Object___to_s))(variable9) /*String::to_s*/;
-    ((string___String___append_t)CALL(variable6,COLOR_abstract_collection___IndexedCollection___append))(variable6, variable9) /*String::append*/;
-    variable10 = NEW_String_string___String___with_native(BOX_NativeString(""), TAG_Int(0)); /*new String*/
-    variable11 = variable10;
-    ((string___String___append_t)CALL(variable6,COLOR_abstract_collection___IndexedCollection___append))(variable6, variable11) /*String::append*/;
-    variable12 =  variable1 /*couple_sep*/;
-    ((string___String___append_t)CALL(variable6,COLOR_abstract_collection___IndexedCollection___append))(variable6, variable12) /*String::append*/;
-    variable13 = NEW_String_string___String___with_native(BOX_NativeString(""), TAG_Int(0)); /*new String*/
-    variable14 = variable13;
-    ((string___String___append_t)CALL(variable6,COLOR_abstract_collection___IndexedCollection___append))(variable6, variable14) /*String::append*/;
-    variable15 =  variable5 /*e*/;
-    variable15 = ((string___String___to_s_t)CALL(variable15,COLOR_string___Object___to_s))(variable15) /*String::to_s*/;
-    ((string___String___append_t)CALL(variable6,COLOR_abstract_collection___IndexedCollection___append))(variable6, variable15) /*String::append*/;
-    variable16 = NEW_String_string___String___with_native(BOX_NativeString(""), TAG_Int(0)); /*new String*/
-    variable17 = variable16;
-    ((string___String___append_t)CALL(variable6,COLOR_abstract_collection___IndexedCollection___append))(variable6, variable17) /*String::append*/;
-    ((string___String___append_t)CALL( variable2 /*s*/,COLOR_abstract_collection___IndexedCollection___append))( variable2 /*s*/, variable6) /*String::append*/;
-  }
-  ((abstract_collection___Iterator___next_t)CALL( variable3 /*i*/,COLOR_abstract_collection___Iterator___next))( variable3 /*i*/) /*Iterator::next*/;
-  while (true) { /*while*/
-    variable6 = ((abstract_collection___Iterator___is_ok_t)CALL( variable3 /*i*/,COLOR_abstract_collection___Iterator___is_ok))( variable3 /*i*/) /*Iterator::is_ok*/;
-    if (!UNTAG_Bool(variable6)) break; /* while*/
-    ((string___String___append_t)CALL( variable2 /*s*/,COLOR_abstract_collection___IndexedCollection___append))( variable2 /*s*/,  variable0 /*sep*/) /*String::append*/;
-    variable6 = ((abstract_collection___MapIterator___key_t)CALL( variable3 /*i*/,COLOR_abstract_collection___MapIterator___key))( variable3 /*i*/) /*MapIterator::key*/;
-    variable4 = variable6 /*k=*/;
-    variable6 = ((abstract_collection___Iterator___item_t)CALL( variable3 /*i*/,COLOR_abstract_collection___Iterator___item))( variable3 /*i*/) /*Iterator::item*/;
-    variable5 = variable6 /*e=*/;
-    variable6 = TAG_Bool(!UNTAG_Bool(TAG_Bool(( variable5 /*e*/ ==  NIT_NULL /*null*/) || (( variable5 /*e*/ != NIT_NULL) && ((((kernel___Object_____eqeq_t)CALL( variable5 /*e*/,COLOR_kernel___Object_____eqeq))==kernel___Object_____eqeq)?(IS_EQUAL_NN( variable5 /*e*/, NIT_NULL /*null*/)):(UNTAG_Bool(((kernel___Object_____eqeq_t)CALL( variable5 /*e*/,COLOR_kernel___Object_____eqeq))( variable5 /*e*/,  NIT_NULL /*null*/) /*Object::==*/)))))));
-    if (UNTAG_Bool(variable6)) { /*if*/
-      variable6 = NEW_String_string___String___init(); /*new String*/
-      variable7 = NEW_String_string___String___with_native(BOX_NativeString(""), TAG_Int(0)); /*new String*/
-      variable8 = variable7;
-      ((string___String___append_t)CALL(variable6,COLOR_abstract_collection___IndexedCollection___append))(variable6, variable8) /*String::append*/;
-      variable9 =  variable4 /*k*/;
-      variable9 = ((string___String___to_s_t)CALL(variable9,COLOR_string___Object___to_s))(variable9) /*String::to_s*/;
-      ((string___String___append_t)CALL(variable6,COLOR_abstract_collection___IndexedCollection___append))(variable6, variable9) /*String::append*/;
-      variable10 = NEW_String_string___String___with_native(BOX_NativeString(""), TAG_Int(0)); /*new String*/
-      variable11 = variable10;
-      ((string___String___append_t)CALL(variable6,COLOR_abstract_collection___IndexedCollection___append))(variable6, variable11) /*String::append*/;
-      variable12 =  variable1 /*couple_sep*/;
-      ((string___String___append_t)CALL(variable6,COLOR_abstract_collection___IndexedCollection___append))(variable6, variable12) /*String::append*/;
-      variable13 = NEW_String_string___String___with_native(BOX_NativeString(""), TAG_Int(0)); /*new String*/
-      variable14 = variable13;
-      ((string___String___append_t)CALL(variable6,COLOR_abstract_collection___IndexedCollection___append))(variable6, variable14) /*String::append*/;
-      variable15 =  variable5 /*e*/;
-      variable15 = ((string___String___to_s_t)CALL(variable15,COLOR_string___Object___to_s))(variable15) /*String::to_s*/;
-      ((string___String___append_t)CALL(variable6,COLOR_abstract_collection___IndexedCollection___append))(variable6, variable15) /*String::append*/;
-      variable16 = NEW_String_string___String___with_native(BOX_NativeString(""), TAG_Int(0)); /*new String*/
-      variable17 = variable16;
-      ((string___String___append_t)CALL(variable6,COLOR_abstract_collection___IndexedCollection___append))(variable6, variable17) /*String::append*/;
-      ((string___String___append_t)CALL( variable2 /*s*/,COLOR_abstract_collection___IndexedCollection___append))( variable2 /*s*/, variable6) /*String::append*/;
+val_t string___Map___map_join(val_t p0, val_t p1, val_t p2){
+  struct {struct stack_frame_t me; val_t MORE_REG[8];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t tmp;
+    static val_t once_value_1; /* Once value */
+    static val_t once_value_3; /* Once value */
+    static val_t once_value_4; /* Once value */
+    static val_t once_value_5; /* Once value */
+    static val_t once_value_6; /* Once value */
+        static val_t once_value_7; /* Once value */
+        static val_t once_value_8; /* Once value */
+        static val_t once_value_9; /* Once value */
+        static val_t once_value_10; /* Once value */
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 553;
+  fra.me.meth = LOCATE_string___Map___map_join;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 9;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[3] = NIT_NULL;
+  fra.me.REG[4] = NIT_NULL;
+  fra.me.REG[5] = NIT_NULL;
+  fra.me.REG[6] = NIT_NULL;
+  fra.me.REG[7] = NIT_NULL;
+  fra.me.REG[8] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  fra.me.REG[2] = p2;
+  /* ./../lib/standard//string.nit:556 */
+  REGB0 = CALL_abstract_collection___Collection___is_empty(fra.me.REG[0])(fra.me.REG[0]);
+  if (UNTAG_Bool(REGB0)) {
+    if (!once_value_1) {
+      fra.me.REG[3] = BOX_NativeString("");
+      REGB0 = TAG_Int(0);
+      fra.me.REG[3] = NEW_String_string___String___with_native(fra.me.REG[3], REGB0);
+      once_value_1 = fra.me.REG[3];
+      register_static_object(&once_value_1);
+    } else fra.me.REG[3] = once_value_1;
+    fra.me.REG[3] = fra.me.REG[3];
+    goto label2;
+  }
+  /* ./../lib/standard//string.nit:558 */
+  fra.me.REG[4] = NEW_Buffer_string___Buffer___init();
+  /* ./../lib/standard//string.nit:561 */
+  fra.me.REG[0] = CALL_abstract_collection___Collection___iterator(fra.me.REG[0])(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:562 */
+  fra.me.REG[5] = CALL_abstract_collection___MapIterator___key(fra.me.REG[0])(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:563 */
+  fra.me.REG[6] = CALL_abstract_collection___Iterator___item(fra.me.REG[0])(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:564 */
+  REGB0 = TAG_Bool(fra.me.REG[6]==NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    REGB1 = TAG_Bool(fra.me.REG[6]==NIT_NULL);
+    if (UNTAG_Bool(REGB1)) {
+      REGB1 = TAG_Bool(false);
+      REGB0 = REGB1;
+    } else {
+      REGB1 = CALL_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)) {
+    REGB0 = TAG_Int(7);
+    fra.me.REG[7] = NEW_Array_array___Array___with_capacity(REGB0);
+    if (!once_value_3) {
+      fra.me.REG[8] = BOX_NativeString("");
+      REGB0 = TAG_Int(0);
+      fra.me.REG[8] = NEW_String_string___String___with_native(fra.me.REG[8], REGB0);
+      once_value_3 = fra.me.REG[8];
+      register_static_object(&once_value_3);
+    } else fra.me.REG[8] = once_value_3;
+    fra.me.REG[8] = fra.me.REG[8];
+    CALL_abstract_collection___SimpleCollection___add(fra.me.REG[7])(fra.me.REG[7], fra.me.REG[8]);
+    fra.me.REG[8] = CALL_string___Object___to_s(fra.me.REG[5])(fra.me.REG[5]);
+    CALL_abstract_collection___SimpleCollection___add(fra.me.REG[7])(fra.me.REG[7], fra.me.REG[8]);
+    if (!once_value_4) {
+      fra.me.REG[8] = BOX_NativeString("");
+      REGB0 = TAG_Int(0);
+      fra.me.REG[8] = NEW_String_string___String___with_native(fra.me.REG[8], REGB0);
+      once_value_4 = fra.me.REG[8];
+      register_static_object(&once_value_4);
+    } else fra.me.REG[8] = once_value_4;
+    fra.me.REG[8] = fra.me.REG[8];
+    CALL_abstract_collection___SimpleCollection___add(fra.me.REG[7])(fra.me.REG[7], fra.me.REG[8]);
+    CALL_abstract_collection___SimpleCollection___add(fra.me.REG[7])(fra.me.REG[7], fra.me.REG[2]);
+    if (!once_value_5) {
+      fra.me.REG[8] = BOX_NativeString("");
+      REGB0 = TAG_Int(0);
+      fra.me.REG[8] = NEW_String_string___String___with_native(fra.me.REG[8], REGB0);
+      once_value_5 = fra.me.REG[8];
+      register_static_object(&once_value_5);
+    } else fra.me.REG[8] = once_value_5;
+    fra.me.REG[8] = fra.me.REG[8];
+    CALL_abstract_collection___SimpleCollection___add(fra.me.REG[7])(fra.me.REG[7], fra.me.REG[8]);
+    fra.me.REG[8] = CALL_string___Object___to_s(fra.me.REG[6])(fra.me.REG[6]);
+    CALL_abstract_collection___SimpleCollection___add(fra.me.REG[7])(fra.me.REG[7], fra.me.REG[8]);
+    if (!once_value_6) {
+      fra.me.REG[8] = BOX_NativeString("");
+      REGB0 = TAG_Int(0);
+      fra.me.REG[8] = NEW_String_string___String___with_native(fra.me.REG[8], REGB0);
+      once_value_6 = fra.me.REG[8];
+      register_static_object(&once_value_6);
+    } else fra.me.REG[8] = once_value_6;
+    fra.me.REG[8] = fra.me.REG[8];
+    CALL_abstract_collection___SimpleCollection___add(fra.me.REG[7])(fra.me.REG[7], fra.me.REG[8]);
+    fra.me.REG[7] = CALL_string___Object___to_s(fra.me.REG[7])(fra.me.REG[7]);
+    CALL_abstract_collection___Sequence___append(fra.me.REG[4])(fra.me.REG[4], fra.me.REG[7]);
+  }
+  /* ./../lib/standard//string.nit:567 */
+  CALL_abstract_collection___Iterator___next(fra.me.REG[0])(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:568 */
+  while(1) {
+    REGB0 = CALL_abstract_collection___Iterator___is_ok(fra.me.REG[0])(fra.me.REG[0]);
+    if (UNTAG_Bool(REGB0)) {
+      /* ./../lib/standard//string.nit:569 */
+      CALL_abstract_collection___Sequence___append(fra.me.REG[4])(fra.me.REG[4], fra.me.REG[1]);
+      /* ./../lib/standard//string.nit:570 */
+      fra.me.REG[7] = CALL_abstract_collection___MapIterator___key(fra.me.REG[0])(fra.me.REG[0]);
+      fra.me.REG[5] = fra.me.REG[7];
+      /* ./../lib/standard//string.nit:571 */
+      fra.me.REG[7] = CALL_abstract_collection___Iterator___item(fra.me.REG[0])(fra.me.REG[0]);
+      fra.me.REG[6] = fra.me.REG[7];
+      /* ./../lib/standard//string.nit:572 */
+      REGB0 = TAG_Bool(fra.me.REG[6]==NIT_NULL);
+      if (UNTAG_Bool(REGB0)) {
+      } else {
+        REGB1 = TAG_Bool(fra.me.REG[6]==NIT_NULL);
+        if (UNTAG_Bool(REGB1)) {
+          REGB1 = TAG_Bool(false);
+          REGB0 = REGB1;
+        } else {
+          REGB1 = CALL_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)) {
+        REGB0 = TAG_Int(7);
+        fra.me.REG[7] = NEW_Array_array___Array___with_capacity(REGB0);
+        if (!once_value_7) {
+          fra.me.REG[8] = BOX_NativeString("");
+          REGB0 = TAG_Int(0);
+          fra.me.REG[8] = NEW_String_string___String___with_native(fra.me.REG[8], REGB0);
+          once_value_7 = fra.me.REG[8];
+          register_static_object(&once_value_7);
+        } else fra.me.REG[8] = once_value_7;
+        fra.me.REG[8] = fra.me.REG[8];
+        CALL_abstract_collection___SimpleCollection___add(fra.me.REG[7])(fra.me.REG[7], fra.me.REG[8]);
+        fra.me.REG[8] = CALL_string___Object___to_s(fra.me.REG[5])(fra.me.REG[5]);
+        CALL_abstract_collection___SimpleCollection___add(fra.me.REG[7])(fra.me.REG[7], fra.me.REG[8]);
+        if (!once_value_8) {
+          fra.me.REG[8] = BOX_NativeString("");
+          REGB0 = TAG_Int(0);
+          fra.me.REG[8] = NEW_String_string___String___with_native(fra.me.REG[8], REGB0);
+          once_value_8 = fra.me.REG[8];
+          register_static_object(&once_value_8);
+        } else fra.me.REG[8] = once_value_8;
+        fra.me.REG[8] = fra.me.REG[8];
+        CALL_abstract_collection___SimpleCollection___add(fra.me.REG[7])(fra.me.REG[7], fra.me.REG[8]);
+        CALL_abstract_collection___SimpleCollection___add(fra.me.REG[7])(fra.me.REG[7], fra.me.REG[2]);
+        if (!once_value_9) {
+          fra.me.REG[8] = BOX_NativeString("");
+          REGB0 = TAG_Int(0);
+          fra.me.REG[8] = NEW_String_string___String___with_native(fra.me.REG[8], REGB0);
+          once_value_9 = fra.me.REG[8];
+          register_static_object(&once_value_9);
+        } else fra.me.REG[8] = once_value_9;
+        fra.me.REG[8] = fra.me.REG[8];
+        CALL_abstract_collection___SimpleCollection___add(fra.me.REG[7])(fra.me.REG[7], fra.me.REG[8]);
+        fra.me.REG[8] = CALL_string___Object___to_s(fra.me.REG[6])(fra.me.REG[6]);
+        CALL_abstract_collection___SimpleCollection___add(fra.me.REG[7])(fra.me.REG[7], fra.me.REG[8]);
+        if (!once_value_10) {
+          fra.me.REG[8] = BOX_NativeString("");
+          REGB0 = TAG_Int(0);
+          fra.me.REG[8] = NEW_String_string___String___with_native(fra.me.REG[8], REGB0);
+          once_value_10 = fra.me.REG[8];
+          register_static_object(&once_value_10);
+        } else fra.me.REG[8] = once_value_10;
+        fra.me.REG[8] = fra.me.REG[8];
+        CALL_abstract_collection___SimpleCollection___add(fra.me.REG[7])(fra.me.REG[7], fra.me.REG[8]);
+        fra.me.REG[7] = CALL_string___Object___to_s(fra.me.REG[7])(fra.me.REG[7]);
+        CALL_abstract_collection___Sequence___append(fra.me.REG[4])(fra.me.REG[4], fra.me.REG[7]);
+      }
+      /* ./../lib/standard//string.nit:573 */
+      CALL_abstract_collection___Iterator___next(fra.me.REG[0])(fra.me.REG[0]);
+    } else {
+      /* ./../lib/standard//string.nit:568 */
+      goto label11;
     }
-    ((abstract_collection___Iterator___next_t)CALL( variable3 /*i*/,COLOR_abstract_collection___Iterator___next))( variable3 /*i*/) /*Iterator::next*/;
-    continue_60: while(0);
-  }
-  break_60: while(0);
-  variable2 =  variable2 /*s*/;
-  goto return_label59;
-  return_label59: while(false);
-  tracehead = trace.prev;
-  return variable2;
+  }
+  label11: while(0);
+  /* ./../lib/standard//string.nit:575 */
+  fra.me.REG[4] = CALL_string___Object___to_s(fra.me.REG[4])(fra.me.REG[4]);
+  fra.me.REG[3] = fra.me.REG[4];
+  goto label2;
+  label2: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[3];
 }
-val_t string___NativeString_____bra(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 508, LOCATE_string___NativeString_____bra};
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  tracehead = trace.prev;
-  return TAG_Char(UNBOX_NativeString( self)[UNTAG_Int( param0)]);
+val_t string___NativeString_____bra(val_t p0, val_t p1){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 585;
+  fra.me.meth = LOCATE_string___NativeString_____bra;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  REGB0 = p1;
+  /* ./../lib/standard//string.nit:585 */
+  REGB0 = TAG_Char(UNBOX_NativeString(fra.me.REG[0])[UNTAG_Int(REGB0)]);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
 }
-void string___NativeString_____braeq(val_t  self, val_t  param0, val_t  param1) {
-  struct trace_t trace = {NULL, NULL, 509, LOCATE_string___NativeString_____braeq};
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  UNBOX_NativeString( self)[UNTAG_Int( param0)]=UNTAG_Char( param1);
-  tracehead = trace.prev;
+void string___NativeString_____braeq(val_t p0, val_t p1, val_t p2){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 586;
+  fra.me.meth = LOCATE_string___NativeString_____braeq;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  REGB0 = p1;
+  REGB1 = p2;
+  /* ./../lib/standard//string.nit:586 */
+  UNBOX_NativeString(fra.me.REG[0])[UNTAG_Int(REGB0)]=UNTAG_Char(REGB1);;
+  stack_frame_head = fra.me.prev;
   return;
 }
-void string___NativeString___copy_to(val_t  self, val_t  param0, val_t  param1, val_t  param2, val_t  param3) {
-  struct trace_t trace = {NULL, NULL, 510, LOCATE_string___NativeString___copy_to};
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  (void)memcpy(UNBOX_NativeString( param0)+UNTAG_Int( param3), UNBOX_NativeString( self)+UNTAG_Int( param2), UNTAG_Int( param1));
-  tracehead = trace.prev;
+void string___NativeString___copy_to(val_t p0, val_t p1, val_t p2, val_t p3, val_t p4){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} 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_string;
+  fra.me.line = 587;
+  fra.me.meth = LOCATE_string___NativeString___copy_to;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 2;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  fra.me.REG[1] = p1;
+  REGB0 = p2;
+  REGB1 = p3;
+  REGB2 = p4;
+  /* ./../lib/standard//string.nit:587 */
+  (void)memcpy(UNBOX_NativeString(fra.me.REG[1])+UNTAG_Int(REGB2), UNBOX_NativeString(fra.me.REG[0])+UNTAG_Int(REGB1), UNTAG_Int(REGB0));;
+  stack_frame_head = fra.me.prev;
   return;
 }
-val_t string___NativeString___cstring_length(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 512, LOCATE_string___NativeString___cstring_length};
-  val_t variable0;
-    val_t variable1;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 =  TAG_Int(0);
-  while (true) { /*while*/
-    variable1 = TAG_Char(UNBOX_NativeString( self)[UNTAG_Int( variable0 /*l*/)]);
-    variable1 = TAG_Bool((variable1)!=( TAG_Char('\0')));
-    if (!UNTAG_Bool(variable1)) break; /* while*/
-    variable0 = TAG_Int(UNTAG_Int(variable0)+UNTAG_Int( TAG_Int(1))) /*l*/;
-    continue_62: while(0);
-  }
-  break_62: while(0);
-  variable0 =  variable0 /*l*/;
-  goto return_label61;
-  return_label61: while(false);
-  tracehead = trace.prev;
-  return variable0;
+val_t string___NativeString___cstring_length(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t REGB2;
+  val_t REGB3;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 589;
+  fra.me.meth = LOCATE_string___NativeString___cstring_length;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//string.nit:592 */
+  REGB0 = TAG_Int(0);
+  /* ./../lib/standard//string.nit:593 */
+  while(1) {
+    /* ./../lib/standard//string.nit:585 */
+    REGB1 = TAG_Char(UNBOX_NativeString(fra.me.REG[0])[UNTAG_Int(REGB0)]);
+    /* ./../lib/standard//string.nit:593 */
+    REGB2 = TAG_Char('\0');
+    REGB3 = TAG_Bool(IS_EQUAL_OO(REGB1,REGB2));
+    if (UNTAG_Bool(REGB3)) {
+    } else {
+      /* ./../lib/standard//kernel.nit:347 */
+      REGB2 = TAG_Bool((REGB1)==(REGB2));
+      /* ./../lib/standard//string.nit:593 */
+      REGB3 = REGB2;
+    }
+    REGB3 = TAG_Bool(!UNTAG_Bool(REGB3));
+    if (UNTAG_Bool(REGB3)) {
+      REGB3 = TAG_Int(1);
+      /* ./../lib/standard//kernel.nit:215 */
+      REGB3 = TAG_Int(UNTAG_Int(REGB0)+UNTAG_Int(REGB3));
+      /* ./../lib/standard//string.nit:593 */
+      REGB0 = REGB3;
+    } else {
+      goto label1;
+    }
+  }
+  label1: while(0);
+  /* ./../lib/standard//string.nit:594 */
+  goto label2;
+  label2: while(0);
+  stack_frame_head = fra.me.prev;
+  return REGB0;
 }
-val_t string___NativeString___atoi(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 519, LOCATE_string___NativeString___atoi};
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  tracehead = trace.prev;
-  return TAG_Int(atoi(UNBOX_NativeString( self)));
+val_t string___NativeString___atoi(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 596;
+  fra.me.meth = LOCATE_string___NativeString___atoi;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//string.nit:596 */
+  REGB0 = TAG_Int(atoi(UNBOX_NativeString(fra.me.REG[0])));
+  stack_frame_head = fra.me.prev;
+  return REGB0;
 }
-void string___NativeString___init(val_t  self, int* init_table) {
-  struct trace_t trace = {NULL, NULL, 0, LOCATE_string___NativeString___init};
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  tracehead = trace.prev;
+void string___NativeString___init(val_t p0, int* init_table){
+  int itpos5 = VAL2OBJ(p0)->vft[INIT_TABLE_POS_NativeString].i;
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  if (init_table[itpos5]) return;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 0;
+  fra.me.meth = LOCATE_string___NativeString___init;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  stack_frame_head = fra.me.prev;
+  init_table[itpos5] = 1;
   return;
 }
-val_t string___StringCapable___calloc_string(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 524, LOCATE_string___StringCapable___calloc_string};
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  tracehead = trace.prev;
-  return BOX_NativeString((char*)malloc((UNTAG_Int( param0) * sizeof(char))));
+val_t string___StringCapable___calloc_string(val_t p0, val_t p1){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 601;
+  fra.me.meth = LOCATE_string___StringCapable___calloc_string;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  REGB0 = p1;
+  /* ./../lib/standard//string.nit:601 */
+  fra.me.REG[0] = BOX_NativeString((char*)raw_alloc((UNTAG_Int(REGB0) * sizeof(char))));
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
 }
-void string___StringCapable___init(val_t  self, int* init_table) {
-  struct trace_t trace = {NULL, NULL, 0, LOCATE_string___StringCapable___init};
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  tracehead = trace.prev;
+void string___StringCapable___init(val_t p0, int* init_table){
+  int itpos6 = VAL2OBJ(p0)->vft[INIT_TABLE_POS_StringCapable].i;
+  struct {struct stack_frame_t me;} fra;
+  val_t tmp;
+  if (init_table[itpos6]) return;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 0;
+  fra.me.meth = LOCATE_string___StringCapable___init;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 0;
+  stack_frame_head = fra.me.prev;
+  init_table[itpos6] = 1;
   return;
 }
-val_t string___Sys___args(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 530, LOCATE_string___Sys___args};
-  val_t variable0;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 = ATTR_string___Sys____args_cache( self) /*Sys::_args_cache*/;
-  variable0 = TAG_Bool((variable0 ==  NIT_NULL /*null*/) || ((variable0 != NIT_NULL) && ((((kernel___Object_____eqeq_t)CALL(variable0,COLOR_kernel___Object_____eqeq))==kernel___Object_____eqeq)?(IS_EQUAL_NN(variable0, NIT_NULL /*null*/)):(UNTAG_Bool(((kernel___Object_____eqeq_t)CALL(variable0,COLOR_kernel___Object_____eqeq))(variable0,  NIT_NULL /*null*/) /*Object::==*/)))));
-  if (UNTAG_Bool(variable0)) { /*if*/
-    ((string___Sys___init_args_t)CALL( self,COLOR_string___Sys___init_args))( self) /*Sys::init_args*/;
-  }
-  variable0 = ATTR_string___Sys____args_cache( self) /*Sys::_args_cache*/;
-  goto return_label63;
-  return_label63: while(false);
-  tracehead = trace.prev;
-  return variable0;
+val_t string___Sys___args(val_t p0){
+  struct {struct stack_frame_t me; val_t MORE_REG[1];} fra;
+  val_t REGB0;
+  val_t REGB1;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 607;
+  fra.me.meth = LOCATE_string___Sys___args;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 2;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//string.nit:609 */
+  fra.me.REG[1] = ATTR_string___Sys____args_cache(fra.me.REG[0]);
+  REGB0 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    REGB1 = TAG_Bool(fra.me.REG[1]==NIT_NULL);
+    if (UNTAG_Bool(REGB1)) {
+      REGB1 = TAG_Bool(false);
+      REGB0 = REGB1;
+    } else {
+      REGB1 = CALL_kernel___Object_____eqeq(fra.me.REG[1])(fra.me.REG[1], NIT_NULL);
+      REGB0 = REGB1;
+    }
+  }
+  if (UNTAG_Bool(REGB0)) {
+    CALL_string___Sys___init_args(fra.me.REG[0])(fra.me.REG[0]);
+  }
+  /* ./../lib/standard//string.nit:610 */
+  fra.me.REG[0] = ATTR_string___Sys____args_cache(fra.me.REG[0]);
+  REGB0 = TAG_Bool(fra.me.REG[0]!=NIT_NULL);
+  if (UNTAG_Bool(REGB0)) {
+  } else {
+    nit_abort("Cast failed", NULL, LOCATE_string, 610);
+  }
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
 }
-val_t string___Sys___program_name(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 536, LOCATE_string___Sys___program_name};
-  val_t variable0;
-  val_t variable1;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable0 = ((string___Sys___native_argv_t)CALL( self,COLOR_string___Sys___native_argv))( self,  TAG_Int(0)) /*Sys::native_argv*/;
-  variable1 = NEW_String_string___String___from_cstring(variable0); /*new String*/
-  variable0 = variable1;
-  goto return_label64;
-  return_label64: while(false);
-  tracehead = trace.prev;
-  return variable0;
+val_t string___Sys___program_name(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 613;
+  fra.me.meth = LOCATE_string___Sys___program_name;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//string.nit:616 */
+  REGB0 = TAG_Int(0);
+  fra.me.REG[0] = CALL_string___Sys___native_argv(fra.me.REG[0])(fra.me.REG[0], REGB0);
+  fra.me.REG[0] = NEW_String_string___String___from_cstring(fra.me.REG[0]);
+  goto label1;
+  label1: while(0);
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
 }
-void string___Sys___init_args(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 542, LOCATE_string___Sys___init_args};
-  val_t variable0;
-  val_t variable1;
-  val_t variable2;
-    val_t variable3;
-    val_t variable4;
-    val_t variable5;
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  variable1 = ((string___Sys___native_argc_t)CALL( self,COLOR_string___Sys___native_argc))( self) /*Sys::native_argc*/;
-  variable0 = variable1;
-  variable2 = NEW_Array_array___Array___with_capacity( TAG_Int(0)); /*new Array[String]*/
-  variable1 = variable2;
-  variable2 =  TAG_Int(1);
-  while (true) { /*while*/
-    variable3 = TAG_Bool(UNTAG_Int( variable2 /*i*/)<UNTAG_Int( variable0 /*argc*/));
-    if (!UNTAG_Bool(variable3)) break; /* while*/
-    variable3 = TAG_Int(UNTAG_Int( variable2 /*i*/)-UNTAG_Int( TAG_Int(1)));
-    variable4 = ((string___Sys___native_argv_t)CALL( self,COLOR_string___Sys___native_argv))( self,  variable2 /*i*/) /*Sys::native_argv*/;
-    variable5 = NEW_String_string___String___from_cstring(variable4); /*new String*/
-    variable4 = variable5;
-    ((array___Array_____braeq_t)CALL( variable1 /*args*/,COLOR_abstract_collection___Map_____braeq))( variable1 /*args*/, variable3, variable4) /*Array::[]=*/;
-    variable2 = TAG_Int(UNTAG_Int(variable2)+UNTAG_Int( TAG_Int(1))) /*i*/;
-    continue_66: while(0);
-  }
-  break_66: while(0);
-  ATTR_string___Sys____args_cache( self) /*Sys::_args_cache*/ =  variable1 /*args*/;
-  tracehead = trace.prev;
+void string___Sys___init_args(val_t p0){
+  struct {struct stack_frame_t me; val_t MORE_REG[2];} 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_string;
+  fra.me.line = 619;
+  fra.me.meth = LOCATE_string___Sys___init_args;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 3;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[1] = NIT_NULL;
+  fra.me.REG[2] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//string.nit:622 */
+  REGB0 = CALL_string___Sys___native_argc(fra.me.REG[0])(fra.me.REG[0]);
+  /* ./../lib/standard//string.nit:623 */
+  REGB1 = TAG_Int(0);
+  fra.me.REG[1] = NEW_Array_array___Array___with_capacity(REGB1);
+  /* ./../lib/standard//string.nit:624 */
+  REGB1 = TAG_Int(1);
+  /* ./../lib/standard//string.nit:625 */
+  while(1) {
+    /* ./../lib/standard//kernel.nit:212 */
+    REGB2 = TAG_Bool(UNTAG_Int(REGB1)<UNTAG_Int(REGB0));
+    /* ./../lib/standard//string.nit:625 */
+    if (UNTAG_Bool(REGB2)) {
+      /* ./../lib/standard//string.nit:626 */
+      REGB2 = TAG_Int(1);
+      /* ./../lib/standard//kernel.nit:217 */
+      REGB2 = TAG_Int(UNTAG_Int(REGB1)-UNTAG_Int(REGB2));
+      /* ./../lib/standard//string.nit:626 */
+      fra.me.REG[2] = CALL_string___Sys___native_argv(fra.me.REG[0])(fra.me.REG[0], REGB1);
+      fra.me.REG[2] = NEW_String_string___String___from_cstring(fra.me.REG[2]);
+      CALL_abstract_collection___Map_____braeq(fra.me.REG[1])(fra.me.REG[1], REGB2, fra.me.REG[2]);
+      /* ./../lib/standard//string.nit:627 */
+      REGB2 = TAG_Int(1);
+      /* ./../lib/standard//kernel.nit:215 */
+      REGB2 = TAG_Int(UNTAG_Int(REGB1)+UNTAG_Int(REGB2));
+      /* ./../lib/standard//string.nit:627 */
+      REGB1 = REGB2;
+    } else {
+      /* ./../lib/standard//string.nit:625 */
+      goto label1;
+    }
+  }
+  label1: while(0);
+  /* ./../lib/standard//string.nit:629 */
+  ATTR_string___Sys____args_cache(fra.me.REG[0]) = fra.me.REG[1];
+  stack_frame_head = fra.me.prev;
   return;
 }
-val_t string___Sys___native_argc(val_t  self) {
-  struct trace_t trace = {NULL, NULL, 555, LOCATE_string___Sys___native_argc};
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  tracehead = trace.prev;
-  return TAG_Int(kernel_Sys_Sys_native_argc_0( self));
+val_t string___Sys___native_argc(val_t p0){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 632;
+  fra.me.meth = LOCATE_string___Sys___native_argc;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  /* ./../lib/standard//string.nit:632 */
+  REGB0 = TAG_Int(kernel_Sys_Sys_native_argc_0(fra.me.REG[0]));
+  stack_frame_head = fra.me.prev;
+  return REGB0;
 }
-val_t string___Sys___native_argv(val_t  self, val_t  param0) {
-  struct trace_t trace = {NULL, NULL, 557, LOCATE_string___Sys___native_argv};
-  trace.prev = tracehead; tracehead = &trace;
-  trace.file = LOCATE_string;
-  tracehead = trace.prev;
-  return BOX_NativeString(kernel_Sys_Sys_native_argv_1( self, UNTAG_Int( param0)));
+val_t string___Sys___native_argv(val_t p0, val_t p1){
+  struct {struct stack_frame_t me;} fra;
+  val_t REGB0;
+  val_t tmp;
+  fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;
+  fra.me.file = LOCATE_string;
+  fra.me.line = 634;
+  fra.me.meth = LOCATE_string___Sys___native_argv;
+  fra.me.has_broke = 0;
+  fra.me.REG_size = 1;
+  fra.me.REG[0] = NIT_NULL;
+  fra.me.REG[0] = p0;
+  REGB0 = p1;
+  /* ./../lib/standard//string.nit:634 */
+  fra.me.REG[0] = BOX_NativeString(kernel_Sys_Sys_native_argv_1(fra.me.REG[0], UNTAG_Int(REGB0)));
+  stack_frame_head = fra.me.prev;
+  return fra.me.REG[0];
 }