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Sync typeshed - #15590
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Sync typeshed#15590
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Source commit: python/typeshed@fc7d472
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: python#13987 (comment) A manual cherry-pick of e437cdf.
svalentin
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Jul 4, 2023
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Diff from mypy_primer, showing the effect of this PR on open source code: aiohttp (https://github.com/aio-libs/aiohttp)
+ aiohttp/connector.py:1067: error: Argument 1 to "connection_made" of "BaseProtocol" has incompatible type "Transport | None"; expected "BaseTransport" [arg-type]
+ aiohttp/connector.py:1070: error: Incompatible return value type (got "tuple[Transport | None, ResponseHandler]", expected "tuple[BaseTransport, ResponseHandler]") [return-value]
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svalentin
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Got commits from https://github.com/python/mypy/commits/master after merging #15590
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Source commit: python/typeshed@fc7d472
More merge conflicts meant the automated PR failed a few days ago.