Update typing.py and test_typing.py from upstream (https://github.com/python/typing)

4cefe74a · Guido van Rossum · 63461bc3 · 4cefe74a · 4cefe74a
Commit 4cefe74a 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