[issue26391] typing: Specialized sub-classes of Generic never call __init__

[Roundup Robot]

Roundup Robot added the comment:

New changeset be3c4151d9bf by Guido van Rossum in branch '3.5':
Many changes from the upstream repo (https://github.com/python/typing).
https://hg.python.org/cpython/rev/be3c4151d9bf

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nosy: +python-dev

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