[issue18772] Fix gdb plugin for new sets dummy object

[Antoine Pitrou]

Antoine Pitrou added the comment:

Attached patch solves the issue and removes the repr()-based hack in the gdb plugin.

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Added file: http://bugs.python.org/file31444/gdb_sets_repr2.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18772>
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