Add support for Never #12153
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Add support for Never #12153
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According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉 |
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This will exist in 3.11 and in the next release of typing-extensions. See python/cpython#30842 and python/typing#1060. The implementation simply introduces a new synonym for
NoReturn.I didn't do anything with
typing.assert_neverbecause it doesn't have any special semantics: it should work just based on the annotations.I also added explicit support for
typing_extensions.NoReturn. I think that one doesn't matter in practice because the typeshed stub for typing-extensions just re-exportstyping.NoReturn. Still, it's nice for completeness.