Sync typeshed #16009
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Sync typeshed #16009
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Source commit: python/typeshed@f28cb8b
This is allegedly causing large performance problems, see 13821 typeshed/8231 had zero hits on mypy_primer, so it's not the worst thing to undo. Patching this in typeshed also feels weird, since there's a more general soundness issue. If a typevar has a bound or constraint, we might not want to solve it to a Literal. If we can confirm the performance regression or fix the unsoundness within mypy, I might pursue upstreaming this in typeshed. (Reminder: add this to the sync_typeshed script once merged)
Since the plugin provides superior type checking: #13987 (comment) A manual cherry-pick of e437cdf.
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Diff from mypy_primer, showing the effect of this PR on open source code: tornado (https://github.com/tornadoweb/tornado)
+ tornado/test/runtests.py:72: error: Unused "type: ignore" comment [unused-ignore]
+ tornado/test/runtests.py:78: error: Unused "type: ignore" comment [unused-ignore]
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Sync typeshed
Source commit:
python/typeshed@f28cb8b
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