--- a/Modules/itertoolsmodule.c	Sat Apr 06 21:21:04 2013 +0200
+++ b/Modules/itertoolsmodule.c	Sat Apr 06 22:51:29 2013 +0300
@@ -54,14 +54,12 @@
 groupby_dealloc(groupbyobject *gbo)
 {
     PyObject_GC_UnTrack(gbo);
-    Py_TRASHCAN_SAFE_BEGIN(gbo)
     Py_XDECREF(gbo->it);
     Py_XDECREF(gbo->keyfunc);
     Py_XDECREF(gbo->tgtkey);
     Py_XDECREF(gbo->currkey);
     Py_XDECREF(gbo->currvalue);
     Py_TYPE(gbo)->tp_free(gbo);
-    Py_TRASHCAN_SAFE_END(gbo)
 }
 
 static int
@@ -743,11 +741,9 @@
 cycle_dealloc(cycleobject *lz)
 {
     PyObject_GC_UnTrack(lz);
-    Py_TRASHCAN_SAFE_BEGIN(lz)
     Py_XDECREF(lz->saved);
     Py_XDECREF(lz->it);
     Py_TYPE(lz)->tp_free(lz);
-    Py_TRASHCAN_SAFE_END(lz)
 }
 
 static int
@@ -890,11 +886,9 @@
 dropwhile_dealloc(dropwhileobject *lz)
 {
     PyObject_GC_UnTrack(lz);
-    Py_TRASHCAN_SAFE_BEGIN(lz)
     Py_XDECREF(lz->func);
     Py_XDECREF(lz->it);
     Py_TYPE(lz)->tp_free(lz);
-    Py_TRASHCAN_SAFE_END(lz)
 }
 
 static int
@@ -915,10 +909,7 @@
 
     iternext = *Py_TYPE(it)->tp_iternext;
     for (;;) {
-        if (Py_EnterRecursiveCall(" while iterating"))
-            return NULL;
         item = iternext(it);
-        Py_LeaveRecursiveCall();
         if (item == NULL)
             return NULL;
         if (lz->start == 1)
@@ -1039,11 +1030,9 @@
 takewhile_dealloc(takewhileobject *lz)
 {
     PyObject_GC_UnTrack(lz);
-    Py_TRASHCAN_SAFE_BEGIN(lz)
     Py_XDECREF(lz->func);
     Py_XDECREF(lz->it);
     Py_TYPE(lz)->tp_free(lz);
-    Py_TRASHCAN_SAFE_END(lz)
 }
 
 static int
@@ -1064,10 +1053,7 @@
     if (lz->stop == 1)
         return NULL;
 
-    if (Py_EnterRecursiveCall(" while iterating"))
-        return NULL;
     item = (*Py_TYPE(it)->tp_iternext)(it);
-    Py_LeaveRecursiveCall();
     if (item == NULL)
         return NULL;
 
@@ -1235,10 +1221,8 @@
 islice_dealloc(isliceobject *lz)
 {
     PyObject_GC_UnTrack(lz);
-    Py_TRASHCAN_SAFE_BEGIN(lz)
     Py_XDECREF(lz->it);
     Py_TYPE(lz)->tp_free(lz);
-    Py_TRASHCAN_SAFE_END(lz)
 }
 
 static int
@@ -1259,10 +1243,7 @@
 
     iternext = *Py_TYPE(it)->tp_iternext;
     while (lz->cnt < lz->next) {
-        if (Py_EnterRecursiveCall(" while iterating"))
-            return NULL;
         item = iternext(it);
-        Py_LeaveRecursiveCall();
         if (item == NULL)
             return NULL;
         Py_DECREF(item);
@@ -1270,10 +1251,7 @@
     }
     if (stop != -1 && lz->cnt >= stop)
         return NULL;
-    if (Py_EnterRecursiveCall(" while iterating"))
-        return NULL;
     item = iternext(it);
-    Py_LeaveRecursiveCall();
     if (item == NULL)
         return NULL;
     lz->cnt++;
@@ -1386,11 +1364,9 @@
 starmap_dealloc(starmapobject *lz)
 {
     PyObject_GC_UnTrack(lz);
-    Py_TRASHCAN_SAFE_BEGIN(lz)
     Py_XDECREF(lz->func);
     Py_XDECREF(lz->it);
     Py_TYPE(lz)->tp_free(lz);
-    Py_TRASHCAN_SAFE_END(lz)
 }
 
 static int
@@ -1408,10 +1384,7 @@
     PyObject *result;
     PyObject *it = lz->it;
 
-    if (Py_EnterRecursiveCall(" while iterating"))
-        return NULL;
     args = (*Py_TYPE(it)->tp_iternext)(it);
-    Py_LeaveRecursiveCall();
     if (args == NULL)
         return NULL;
     if (!PyTuple_CheckExact(args)) {
@@ -1536,11 +1509,9 @@
 imap_dealloc(imapobject *lz)
 {
     PyObject_GC_UnTrack(lz);
-    Py_TRASHCAN_SAFE_BEGIN(lz)
     Py_XDECREF(lz->iters);
     Py_XDECREF(lz->func);
     Py_TYPE(lz)->tp_free(lz);
-    Py_TRASHCAN_SAFE_END(lz)
 }
 
 static int
@@ -1715,11 +1686,9 @@
 chain_dealloc(chainobject *lz)
 {
     PyObject_GC_UnTrack(lz);
-    Py_TRASHCAN_SAFE_BEGIN(lz)
     Py_XDECREF(lz->active);
     Py_XDECREF(lz->source);
     Py_TYPE(lz)->tp_free(lz);
-    Py_TRASHCAN_SAFE_END(lz)
 }
 
 static int
@@ -2868,11 +2837,9 @@
 compress_dealloc(compressobject *lz)
 {
     PyObject_GC_UnTrack(lz);
-    Py_TRASHCAN_SAFE_BEGIN(lz)
     Py_XDECREF(lz->data);
     Py_XDECREF(lz->selectors);
     Py_TYPE(lz)->tp_free(lz);
-    Py_TRASHCAN_SAFE_END(lz)
 }
 
 static int
@@ -2899,16 +2866,11 @@
            exception first).
         */
 
-        if (Py_EnterRecursiveCall(" while iterating"))
+        datum = datanext(data);
+        if (datum == NULL)
             return NULL;
-        datum = datanext(data);
-        if (datum == NULL) {
-            Py_LeaveRecursiveCall();
-            return NULL;
-        }
 
         selector = selectornext(selectors);
-        Py_LeaveRecursiveCall();
         if (selector == NULL) {
             Py_DECREF(datum);
             return NULL;
@@ -3021,11 +2983,9 @@
 ifilter_dealloc(ifilterobject *lz)
 {
     PyObject_GC_UnTrack(lz);
-    Py_TRASHCAN_SAFE_BEGIN(lz)
     Py_XDECREF(lz->func);
     Py_XDECREF(lz->it);
     Py_TYPE(lz)->tp_free(lz);
-    Py_TRASHCAN_SAFE_END(lz)
 }
 
 static int
@@ -3046,10 +3006,7 @@
 
     iternext = *Py_TYPE(it)->tp_iternext;
     for (;;) {
-        if (Py_EnterRecursiveCall(" while iterating"))
-            return NULL;
         item = iternext(it);
-        Py_LeaveRecursiveCall();
         if (item == NULL)
             return NULL;
 
@@ -3171,11 +3128,9 @@
 ifilterfalse_dealloc(ifilterfalseobject *lz)
 {
     PyObject_GC_UnTrack(lz);
-    Py_TRASHCAN_SAFE_BEGIN(lz)
     Py_XDECREF(lz->func);
     Py_XDECREF(lz->it);
     Py_TYPE(lz)->tp_free(lz);
-    Py_TRASHCAN_SAFE_END(lz)
 }
 
 static int
@@ -3196,10 +3151,7 @@
 
     iternext = *Py_TYPE(it)->tp_iternext;
     for (;;) {
-        if (Py_EnterRecursiveCall(" while iterating"))
-            return NULL;
         item = iternext(it);
-        Py_LeaveRecursiveCall();
         if (item == NULL)
             return NULL;
 
@@ -3599,11 +3551,9 @@
 izip_dealloc(izipobject *lz)
 {
     PyObject_GC_UnTrack(lz);
-    Py_TRASHCAN_SAFE_BEGIN(lz)
     Py_XDECREF(lz->ittuple);
     Py_XDECREF(lz->result);
     Py_TYPE(lz)->tp_free(lz);
-    Py_TRASHCAN_SAFE_END(lz)
 }
 
 static int
@@ -3626,15 +3576,15 @@
 
     if (tuplesize == 0)
         return NULL;
-    if (Py_EnterRecursiveCall(" while iterating"))
-        return NULL;
     if (Py_REFCNT(result) == 1) {
         Py_INCREF(result);
         for (i=0 ; i < tuplesize ; i++) {
             it = PyTuple_GET_ITEM(lz->ittuple, i);
             item = (*Py_TYPE(it)->tp_iternext)(it);
-            if (item == NULL)
-                goto error;
+            if (item == NULL) {
+                Py_DECREF(result);
+                return NULL;
+            }
             olditem = PyTuple_GET_ITEM(result, i);
             PyTuple_SET_ITEM(result, i, item);
             Py_DECREF(olditem);
@@ -3642,21 +3592,18 @@
     } else {
         result = PyTuple_New(tuplesize);
         if (result == NULL)
-            goto error;
+            return NULL;
         for (i=0 ; i < tuplesize ; i++) {
             it = PyTuple_GET_ITEM(lz->ittuple, i);
             item = (*Py_TYPE(it)->tp_iternext)(it);
-            if (item == NULL)
-                goto error;
+            if (item == NULL) {
+                Py_DECREF(result);
+                return NULL;
+            }
             PyTuple_SET_ITEM(result, i, item);
         }
     }
-    Py_LeaveRecursiveCall();
     return result;
-error:
-    Py_XDECREF(result);
-    Py_LeaveRecursiveCall();
-    return NULL;
 }
 
 PyDoc_STRVAR(izip_doc,
@@ -3945,12 +3892,10 @@
 izip_longest_dealloc(iziplongestobject *lz)
 {
     PyObject_GC_UnTrack(lz);
-    Py_TRASHCAN_SAFE_BEGIN(lz)
     Py_XDECREF(lz->ittuple);
     Py_XDECREF(lz->result);
     Py_XDECREF(lz->fillvalue);
     Py_TYPE(lz)->tp_free(lz);
-    Py_TRASHCAN_SAFE_END(lz)
 }
 
 static int