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

[Roundup Robot]

Roundup Robot added the comment:

New changeset c3f960cff3e6 by Serhiy Storchaka in branch '3.4':
Issue #22823: Use set literals in lib2to3.
https://hg.python.org/cpython/rev/c3f960cff3e6

New changeset d3e43f7ecca8 by Serhiy Storchaka in branch 'default':
Issue #22823: Use set literals in lib2to3.
https://hg.python.org/cpython/rev/d3e43f7ecca8

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