[issue24450] Add cr_await calculated property to coroutine object

[Martin Panter]

Martin Panter added the comment:

For Benno’s original gi_yieldfrom property, I guess the asyncio.coroutines.CoroWrapper class would need updating. The GeneratorWrapper class for @types.coroutine probably should be updated too, since it already supports other internal generator properties.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24450>
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