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

[Yury Selivanov]

Change by Yury Selivanov <yselivanov at gmail.com>:


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keywords: +patch
pull_requests: +6796
stage:  -> patch review

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