Merge 3.2 (linked to issue #1294232)

Python/bltinmodule.c

@@ -40,7 +40,7 @@ builtin___build_class__(PyObject *self, PyObject *args, PyObject *kwds)
 {
     PyObject *func, *name, *bases, *mkw, *meta, *winner, *prep, *ns, *cell;
     PyObject *cls = NULL;
-    Py_ssize_t nargs, nbases;
+    Py_ssize_t nargs;
     int isclass;
     _Py_IDENTIFIER(__prepare__);