--- a/Python/pythonrun.c	Mon Apr 04 23:42:30 2011 +0200
+++ b/Python/pythonrun.c	Tue Apr 05 00:39:01 2011 +0200
@@ -62,6 +62,7 @@
 static PyObject *run_pyc_file(FILE *, const char *, PyObject *, PyObject *,
                               PyCompilerFlags *);
 static void err_input(perrdetail *);
+static void err_free(perrdetail *);
 static void initsigs(void);
 static void call_py_exitfuncs(void);
 static void wait_for_thread_shutdown(void);
@@ -1887,12 +1888,13 @@
         flags->cf_flags |= iflags & PyCF_MASK;
         mod = PyAST_FromNode(n, flags, filename, arena);
         PyNode_Free(n);
-        return mod;
     }
     else {
         err_input(&err);
-        return NULL;
+        mod = NULL;
     }
+    err_free(&err);
+    return mod;
 }
 
 mod_ty
@@ -1917,14 +1919,15 @@
         flags->cf_flags |= iflags & PyCF_MASK;
         mod = PyAST_FromNode(n, flags, filename, arena);
         PyNode_Free(n);
-        return mod;
     }
     else {
         err_input(&err);
         if (errcode)
             *errcode = err.error;
-        return NULL;
+        mod = NULL;
     }
+    err_free(&err);
+    return mod;
 }
 
 /* Simplified interface to parsefile -- return node or set exception */
@@ -1938,6 +1941,7 @@
                                       start, NULL, NULL, &err, flags);
     if (n == NULL)
         err_input(&err);
+    err_free(&err);
 
     return n;
 }
@@ -1952,6 +1956,7 @@
                                         start, &err, flags);
     if (n == NULL)
         err_input(&err);
+    err_free(&err);
     return n;
 }
 
@@ -1964,6 +1969,7 @@
                             &_PyParser_Grammar, start, &err, flags);
     if (n == NULL)
         err_input(&err);
+    err_free(&err);
     return n;
 }
 
@@ -1977,11 +1983,23 @@
    even parser modules. */
 
 void
+PyParser_ClearError(perrdetail *err)
+{
+    err_free(err);
+}
+
+void
 PyParser_SetError(perrdetail *err)
 {
     err_input(err);
 }
 
+static void
+err_free(perrdetail *err)
+{
+    Py_CLEAR(err->filename);
+}
+
 /* Set the error appropriate to the given input error code (see errcode.h) */
 
 static void
@@ -1989,7 +2007,6 @@
 {
     PyObject *v, *w, *errtype, *errtext;
     PyObject *msg_obj = NULL;
-    PyObject *filename;
     char *msg = NULL;
 
     errtype = PyExc_SyntaxError;
@@ -2075,17 +2092,8 @@
         errtext = PyUnicode_DecodeUTF8(err->text, strlen(err->text),
                                        "replace");
     }
-    if (err->filename != NULL)
-        filename = PyUnicode_DecodeFSDefault(err->filename);
-    else {
-        Py_INCREF(Py_None);
-        filename = Py_None;
-    }
-    if (filename != NULL)
-        v = Py_BuildValue("(NiiN)", filename,
-                          err->lineno, err->offset, errtext);
-    else
-        v = NULL;
+    v = Py_BuildValue("(OiiN)", err->filename,
+                      err->lineno, err->offset, errtext);
     if (v != NULL) {
         if (msg_obj)
             w = Py_BuildValue("(OO)", msg_obj, v);