[issue28649] refleak in typing.py

[Roundup Robot]

Roundup Robot added the comment:

New changeset 0da2e381ad71 by Guido van Rossum in branch '3.5':
Issue #28649: fix first issue with _ForwardRef (#327)
https://hg.python.org/cpython/rev/0da2e381ad71

New changeset 249a1f0b2857 by Guido van Rossum in branch '3.6':
Issue #28649: fix first issue with _ForwardRef (#327) (3.5->3.6)
https://hg.python.org/cpython/rev/249a1f0b2857

New changeset 304f017462e4 by Guido van Rossum in branch 'default':
Issue #28649: fix first issue with _ForwardRef (#327) (3.6->3.7)
https://hg.python.org/cpython/rev/304f017462e4

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<http://bugs.python.org/issue28649>
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