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Fix self-referential upper bound in new-style type variables #17407

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merged 2 commits into from
Jun 20, 2024

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ilevkivskyi
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Fixes #17347

This copies old-style TypeVar logic 1:1 (I know it is ugly, but I don't think there is anything better now). Also while I am touching this code, I am removing third_pass argument (third pass is not a thing for ~5 years now).

@ilevkivskyi ilevkivskyi requested a review from JukkaL June 19, 2024 23:21

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Thanks for fixing this! I couldn't remember how this all worked and was pretty confused when I briefly looked into this myself.

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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅

@JelleZijlstra JelleZijlstra merged commit f9d8f3a into python:master Jun 20, 2024
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@ilevkivskyi ilevkivskyi deleted the fix-type-var-bound branch June 20, 2024 19:02
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Failed to resolve the boundary type in a PEP 695 new style definition
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