[issue25612] nested try..excepts don't work correctly for generators

[Ned Deily]

Ned Deily <nad at python.org> added the comment:

P.S. I added a very minimal What's New in 3.7 entry for this change since it has affected some downline projects.  I just copied the NEWS entry.  Feel free to expand it and/or move it to a better location in the file.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue25612>
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