Amaury Forgeot d'Arc <[EMAIL PROTECTED]> added the comment:
The KeyError initially contains the correct frozenset, but its content
is swapped with the original set object (yes, like C++ std::set::swap(),
this mutates the frozenset!).
Attached a patch with unit test. The exception now shows the original key:
KeyError: {3, 4}
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keywords: +needs review, patch
nosy: +amaury.forgeotdarc
Added file: http://bugs.python.org/file11733/set_remove.patch
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Python tracker <[EMAIL PROTECTED]>
<http://bugs.python.org/issue4069>
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