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GeezerVison is showing github.com — Bind type variables in ParamSpec callable aliases by mengqing88 · Pull Request #22443 · python/mypy

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@mengqing88

@mengqing88 mengqing88 commented Nov 11, 2026

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Fixes #22399

When a generic alias over Callable is instantiated with a concrete parameter list or ellipsis in its ParamSpec slot, analyze the expanded callable so free type variables bind to the returned callable instead of being reported as unbound in the enclosing scope. Ordinary aliases and alias-definition analysis retain their existing behavior.

Tests:

  • 683 related type-check tests passed, 2 skipped
  • PEP 695 reproduction passed with Python 3.12 target
  • Ruff, Black, and git diff checks passed

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@mengqing88
Bind type variables in ParamSpec callable aliases
6215214
@mengqing88
mengqing88 force-pushed the fix/param-spec-alias-callable branch from d776ccd to 6215214 Compare November 11, 2026 15:43
@github-actions

github-actions Bot commented Nov 11, 2026

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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅
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Type variable reported unbound when only a ParamSpec alias's return type uses it and its ParamSpec slot is not a ParamSpec

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@mengqing88
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