Fix another crash scenario on recursive tuple types #17708
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
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Fixes #17691
This looks quite ad-hoc, but the only clean alternative is to remove the existing recursive types optimization we have in
subtypes.py. But the best I can get without that optimization is -7% performance penalty (on self-check). So I think it is not worth it, since it is still a corner case.cc @JukkaL