[issue41987] singledispatchmethod raises an error when relying on a forward declaration

[mental]

mental <m3nta1 at yahoo.com> added the comment:

Interesting! thanks for the hint guido I'll try to investigate further.

This sounds like a regression (to me at least), in that case should a separate issue & patch PR be opened on the bpo or should this issue be used instead?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41987>
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