[issue30491] Add a lightweight mechanism for detecting un-awaited coroutine objects

[Nathaniel Smith]

Nathaniel Smith <njs at pobox.com> added the comment:

I have a patch for this, but it will be simplest if we can merge https://github.com/python/cpython/pull/5250 (for bpo-32591) first, because they touch a lot of overlapping code.

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<https://bugs.python.org/issue30491>
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