Fix crash on invalid type variable with ParamSpec #15953
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Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
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@hauntsaninja |
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JukkaL
approved these changes
Aug 25, 2023
| return list(an_args) | ||
| if any(isinstance(a, (Parameters, ParamSpecType)) for a in an_args): | ||
| # Nested parameter specifications are not allowed. | ||
| return list(an_args) |
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Another option might be to generate an error and return a list with a single any type.
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Yeah, currently this will say something like "Too many arguments", I will check if we can make error messages better on this.
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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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Fixes #15948
The fix is straightforward: invalid type variable resulted in applying type arguments packing/simplification when we shouldn't. Making the latter more strict fixes the issue.
cc @A5rocks