Update typing.py and test_typing.py from upstream...

Update typing.py and test_typing.py from upstream (https://github.com/python/typing) (merge 3.5->3.6)

Update typing.py and test_typing.py from upstream...
Update typing.py and test_typing.py from upstream (https://github.com/python/typing) (merge 3.5->3.6)
6703e042 · Guido van Rossum · 49d2c389 · 4cefe74a · 6703e042 · 6703e042
Commit 6703e042 authored Sep 27, 2016 by Guido van Rossum
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Lib/test/test_typing.py Lib/test/test_typing.py +114 -223

Lib/typing.py Lib/typing.py +302 -339

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--- a/Lib/test/test_typing.py
+++ b/Lib/test/test_typing.py
--- a/Lib/typing.py
+++ b/Lib/typing.py