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gh-142965: Fix Concatenate documentation to reflect valid use cases #143316

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gh-142965: Fix Concatenate documentation to reflect valid use cases #143316

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gh-142965: Fix Concatenate documentation to reflect valid use cases
sandole Dec 31, 2025
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Merge branch 'main' into fix-concatenate-docs-142965
sandole Jan 1, 2026
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3 changes: 2 additions & 1 deletion Doc/library/typing.rst
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Expand Up @@ -1174,7 +1174,8 @@ These can be used as types in annotations. They all support subscription using
or transforms parameters of another
callable. Usage is in the form
``Concatenate[Arg1Type, Arg2Type, ..., ParamSpecVariable]``. ``Concatenate``
is currently only valid when used as the first argument to a :ref:`Callable <annotating-callables>`.
is valid when used in :ref:`Callable <annotating-callables>` type hints
and when instantiating user-defined generic classes with :class:`ParamSpec` parameters.
The last parameter to ``Concatenate`` must be a :class:`ParamSpec` or
ellipsis (``...``).

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