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fix: preserve generator error context #18161

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@bzoracler bzoracler commented Nov 18, 2024

Fixes #12498.

The callable return type's line number is preserved across dmypy run invocations, while the callable type is not.

The reporting context imitates the following:

mypy/mypy/checker.py

Lines 1210 to 1212 in 8ef2197

self.fail(
message_registry.RETURN_TYPE_CANNOT_BE_CONTRAVARIANT, typ.ret_type
)

That didn't work - trying again with the function definition context...

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github-actions bot commented Dec 6, 2024

According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅

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dmypy: Line number disappears when invoking multiple times
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