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I just applied the dict version of dummy to sets in http://hg.python.org/cpython/rev/f0202c3daa7a
and it unexpectedly broke test_gdb again:
FAIL: test_sets (test.test_gdb.PrettyPrintTests)
Verify the pretty-printing of sets
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Traceback (most recent call last):
 File "/home/shager/cpython-buildarea/3.x.edelsohn-powerlinux-ppc64/build/Lib/test/test_gdb.py", line 319, in test_sets
 self.assertEqual(gdb_repr, "{'b'}")
AssertionError: "{<<dummy key> type at remote 0x103b35c0>, 'b'}" != "{'b'}"
- {<<dummy key> type at remote 0x103b35c0>, 'b'}
+ {'b'}
Antoine, can you see what the issue is? Why does this show as the dummy key type instead of being recognized as the object returned by _PySet_Dummy? I'm not sure why this works for dicts, but not for sets.