[issue33672] Fix Task.__repr__ crash when trying to format Cython's bogus coroutines

[Yury Selivanov]

Yury Selivanov <yselivanov at gmail.com> added the comment:

Ned, this one would be nice to have in 3.7.0.

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nosy: +ned.deily
priority: normal -> release blocker

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33672>
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