accept bytes for the AST 'string' type

This is a temporary kludge and all is well in 3.3.

Misc/NEWS

@@ -13,6 +13,9 @@ Core and Builtins
 - Issue #12326: sys.platform is now always 'linux2' on Linux, even if Python
   is compiled on Linux 3.
 
+- Accept bytes for the AST string type. This is temporary until a proper fix in
+  3.3.
+
 Library
 -------
 

Parser/asdl_c.py

@@ -805,7 +805,7 @@ static int obj2ast_identifier(PyObject* obj, PyObject** out, PyArena* arena)
 
 static int obj2ast_string(PyObject* obj, PyObject** out, PyArena* arena)
 {
-    if (!PyUnicode_CheckExact(obj)) {
+    if (!PyUnicode_CheckExact(obj) && !PyBytes_CheckExact(obj)) {
         PyErr_SetString(PyExc_TypeError, "AST string must be of type str");
         return 1;
     }

Python/Python-ast.c

@@ -611,7 +611,7 @@ static int obj2ast_identifier(PyObject* obj, PyObject** out, PyArena* arena)
 
 static int obj2ast_string(PyObject* obj, PyObject** out, PyArena* arena)
 {
-    if (!PyUnicode_CheckExact(obj)) {
+    if (!PyUnicode_CheckExact(obj) && !PyBytes_CheckExact(obj)) {
         PyErr_SetString(PyExc_TypeError, "AST string must be of type str");
         return 1;
     }