[issue42725] PEP 563: Should the behavior change for yield/yield from's

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

Okay, let's do it. It should probably a post-parse check (before we invoke the bytecode compiler but after we have the AST in hand).

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<https://bugs.python.org/issue42725>
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