[issue22823] Use set literals instead of creating a set from a list

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

You have missed Parser/asdl.py and Tools/clinic/clinic.py.

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Added file: http://bugs.python.org/file37161/set_literal_2.patch

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<http://bugs.python.org/issue22823>
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