Narrow TypeVars in the negative case + narrow them through upper bounds #15711
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While the second part of this (upper bound narrowing) could be another PR, I believe it's the better state for the initial PR and it's not much extra work.
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Oops. That other PR has a nicer printing of stuff. Maybe I should stick to only narrowing in the negative case. |
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Diff from mypy_primer, showing the effect of this PR on open source code: mitmproxy (https://github.com/mitmproxy/mitmproxy)
+ mitmproxy/coretypes/serializable.py:186: error: Unused "type: ignore" comment [unused-ignore]
steam.py (https://github.com/Gobot1234/steam.py)
- steam/ext/commands/commands.py:287: error: Argument 1 to "append" of "list" has incompatible type "Command[Any, Any, Any]"; expected "Self" [arg-type]
- steam/ext/commands/commands.py:940: error: Incompatible return value type (got "Command[Any, Any, Any] | MaybeCommandT", expected "MaybeBool | MaybeCommandT") [return-value]
mypy (https://github.com/python/mypy)
+ mypy/typeops.py:342: error: Incompatible types in assignment (expression has type "CallableType", variable has type "F") [assignment]
pandas-stubs (https://github.com/pandas-dev/pandas-stubs)
+ tests/__init__.py:30: error: Unused "type: ignore" comment [unused-ignore]
+ tests/__init__.py:44: error: Unused "type: ignore" comment [unused-ignore]
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I propose to close this in favor of #19183 that offers a different approach. |
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See the title