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Rephrase typing.assert_never docs by hauntsaninja · Pull Request #92061 · python/cpython · GitHub

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Rephrase typing.assert_never docs #92061

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JelleZijlstra merged 2 commits into from
Apr 30, 2022
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Rephrase typing.assert_never docs #92061

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Rephrase typing.assert_never docs
hauntsaninja Apr 29, 2022
414caca
additional reword from alexwaygood
hauntsaninja Apr 29, 2022
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4 changes: 2 additions & 2 deletions Doc/library/typing.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -2337,7 +2337,7 @@ Functions and decorators

.. function:: assert_never(arg, /)

Assert to the type checker that a line of code is unreachable.
Ask a static type checker to confirm that a line of code is unreachable.

Example::

Expand All @@ -2358,7 +2358,7 @@ Functions and decorators
reachable, it will emit an error. For example, if the type annotation
for ``arg`` was instead ``int | str | float``, the type checker would
emit an error pointing out that ``unreachable`` is of type :class:`float`.
For a call to ``assert_never`` to succeed, the inferred type of
For a call to ``assert_never`` to pass type checking, the inferred type of
the argument passed in must be the bottom type, :data:`Never`, and nothing
else.

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