[issue6690] BUILD_SET followed by COMPARE_OP (in) can be optimized if all items are consts

[Alex]

Alex <alex.gaynor at gmail.com> added the comment:

David, I think it should use frozen set since doing it this way could actually increase the time the operation takes (which is certainly not our goal!).  Plus marshall.c already handles frozenset, so I don't think it's that much more work.

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<http://bugs.python.org/issue6690>
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