Patch from SF bug 570483 (Tim Northover).

gvanrossum · gvanrossum · commit a96b0df62424 · 2002-06-18T16:49:45.000Z
In a fresh interpreter, type.mro(tuple) would segfault, because
PyType_Ready() isn't called for tuple yet.  To fix, call
PyType_Ready(type) if type-&gt;tp_dict is NULL.
diff --git a/Lib/test/test_descr.py b/Lib/test/test_descr.py
@@ -3169,6 +3169,12 @@ def __pow__(self, *args):
     except:
         pass
 
+    if verbose:
+        print "Testing SF bug 570483..."
+    # Another segfault only when run early
+    # (before PyType_Ready(tuple) is called)
+    type.mro(tuple)
+
 def test_main():
     do_this_first()
     class_docstrings()
