[issue27811] _PyGen_Finalize() should not fail with an exception

[Armin Rigo]

New submission from Armin Rigo:

_PyGen_Finalize() should not fail with an exception.  Doing so can cause various SystemErrors or even fatal errors.  For example, run this with "python -Werror":

    import gc
    async def f():
        pass
    f()
    gc.collect()   # RuntimeWarning, but with -Werror

Patch attached.  Test missing (turn the above example in a test; also I didn't re-run all tests with this patch).

----------
files: patch1.diff
keywords: needs review, patch
messages: 273199
nosy: arigo
priority: normal
severity: normal
status: open
title: _PyGen_Finalize() should not fail with an exception
versions: Python 3.6
Added file: http://bugs.python.org/file44165/patch1.diff

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<http://bugs.python.org/issue27811>
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