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Fix crash on non-normalized parameters expansion - #22123
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Diff from mypy_primer, showing the effect of this PR on open source code: scipy-stubs (https://github.com/scipy/scipy-stubs)
- tests/misc/test_submodules_empty.pyi:3: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
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JukkaL
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Oct 8, 2026
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The refactoring and fix look good (negative lines of code for the PR!), I just have one question.
| return t.copy_modified(arg_types=self.expand_types(t.arg_types)) | ||
| # This mimics the logic in visit_callable_type(). | ||
| var_arg = t.var_arg() | ||
| needs_normalization = False |
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Should we also look at self.normalize_callables -- is it relevant here?
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No, I think we are fine (even for callables we really need to keep original shape only for top-level callables).
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Fixes #21778
Fix by itself trivial:
Parametersrequire the same level of care asCallableTypewhen expanding. However, we have already a bunch of code duplication between two, and this PR would have added another ~80 lines of duplicated code, so I decided to refactor all shared logic into a separate base class.I verified that this causes no visible slow-down on self-check (compiled, -n0):
cc @JukkaL