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Optimize Unpack for failures #15967

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merged 2 commits into from
Aug 29, 2023

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ilevkivskyi
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This is a small but possibly important PR. Wherever possible we should represent user error and/or failed type inference as *tuple[Any, ...]/*tuple[<nothing>, ...], rather than Unpack[Any]/Unpack[<nothing>] or plain Any/<nothing>. This way we will not need any special casing for failure conditions in various places without risking a crash instead of a graceful failure (error message).

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

@ilevkivskyi ilevkivskyi merged commit 1714028 into python:master Aug 29, 2023
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@ilevkivskyi ilevkivskyi deleted the optimize-unpack-failures branch August 29, 2023 09:17
JukkaL pushed a commit that referenced this pull request Oct 10, 2023
This is a small but possibly important PR. Wherever possible we should
represent user error and/or failed type inference as `*tuple[Any,
...]`/`*tuple[<nothing>, ...]`, rather than
`Unpack[Any]`/`Unpack[<nothing>]` or plain `Any`/`<nothing>`. This way
we will not need any special casing for failure conditions in various
places without risking a crash instead of a graceful failure (error
message).
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