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Friendlier errors for PEP 612 #12832

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merged 3 commits into from May 23, 2022
Merged

Friendlier errors for PEP 612 #12832

merged 3 commits into from May 23, 2022

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hauntsaninja
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@@ -944,9 +944,9 @@ def analyze_callable_type(self, t: UnboundType) -> Type:
)
if maybe_ret is None:
# Callable[?, RET] (where ? is something invalid)
# TODO(PEP612): change error to mention paramspec, once we actually have some
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Or Concatenate?

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Though that's getting a bit much for an error message.

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@ethanhs ethanhs May 21, 2022

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I like the new language, maybe a note linking to some docs would be useful in addition however.

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Yeah, Concatenate is why I went with the more generic "parameter specification" rather than "ParamSpec". This error is probably disproportionately encountered by new users, so don't want it to be too scary.

I could add a note for https://mypy.readthedocs.io/en/stable/kinds_of_types.html#callable-types-and-lambdas

@hauntsaninja hauntsaninja changed the title Improve Callable error for PEP 612 Friendlier errors for PEP 612 May 21, 2022
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According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉

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@JukkaL JukkaL left a comment

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I like the new error messages -- clearer and less confusing.

@JukkaL JukkaL merged commit 24ef8d0 into python:master May 23, 2022
JukkaL pushed a commit that referenced this pull request May 23, 2022
Co-authored-by: hauntsaninja <>
@hauntsaninja hauntsaninja deleted the pspec-error branch May 23, 2022 17:34
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4 participants