[issue24400] Awaitable ABC incompatible with functools.singledispatch

[Nick Coghlan]

Nick Coghlan added the comment:

Based on that last comment, I realised there's something else @types.coroutine should now do: delegate both the existing gi_* attributes *and* the new cr_* attributes to the underlying generator.

That should allow all of the poking around in code object flags to be encapsulated entirely in the types module, as the 3 kinds of object would subsequently be distinguishable by their attributes:

    gi_running: generator-iterator or generator-as-coroutine
    cr_running: native coroutine or generator-as-coroutine
    both: generator-as-coroutine

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<http://bugs.python.org/issue24400>
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