Chris Angelico added the comment:

Okay! I think I have something here. DEFINITELY needs more eyeballs, but all 
tests pass, including a new one that tests StopIteration leakage both with and 
without the __future__ directive. Some docs changes have been made (I grepped 
for 'stopiteration' and 'generator' case insensitively, and changed anything 
that caught my eye). It'd be nice if the entire test suite and standard library 
could be guaranteed to work in a post-3.7 world, but I don't know of an easy 
way to do that, short of peppering the code with unnecessary __future__ 
directives.

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Added file: http://bugs.python.org/file37646/pep0479.patch

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