Unwrap type[Union[...]] when solving typevar constraints
#18266
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Primer diff is fine, it was a false positive. |
JukkaL
reviewed
Dec 20, 2024
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Diff from mypy_primer, showing the effect of this PR on open source code: Tanjun (https://github.com/FasterSpeeding/Tanjun)
- tanjun/annotations.py:1064: error: Incompatible return value type (got "object", expected "User | Role | Snowflake | _T") [return-value]
colour (https://github.com/colour-science/colour)
+ colour/geometry/section.py:88: error: Need type annotation for "edge_list" [var-annotated]
- colour/geometry/section.py:90: error: Item "float" of "float | list[float] | list[list[float]] | list[list[list[Any]]]" has no attribute "pop" [union-attr]
- colour/geometry/section.py:91: error: Value of type "Any | float | list[float] | list[list[Any]]" is not indexable [index]
- colour/geometry/section.py:93: error: Argument 1 to "len" has incompatible type "float | list[float] | list[list[float]] | list[list[list[Any]]]"; expected "Sized" [arg-type]
- colour/geometry/section.py:100: error: Item "float" of "float | list[float] | list[list[float]] | list[list[list[Any]]]" has no attribute "pop" [union-attr]
- colour/geometry/section.py:101: error: Value of type "Any | float | list[float] | list[list[Any]]" is not indexable [index]
- colour/geometry/section.py:103: error: Item "float" of "float | list[float] | list[list[float]] | list[list[list[Any]]]" has no attribute "pop" [union-attr]
- colour/geometry/section.py:104: error: Value of type "Any | float | list[float] | list[list[Any]]" is not indexable [index]
+ colour/io/fichet2021.py:682: error: Need type annotation for "chromaticities" (hint: "chromaticities: list[<type>] = ...") [var-annotated]
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Hm, and this new diff is weird. I'll try to figure out the reason for the |
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Closes #18265, closes #12115.
type[A | B]is internally represented astype[A] | type[B], and this causes problems for a typevar solver. Prevent using meet in such cases by unwrapingtype[...]if both sides have such shape.