Unwrap type[Union[...]] when solving typevar constraints
#18266
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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]
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Primer diff is fine, it was a false positive. |
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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.