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

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The documentation previously stated that Concatenate is only valid
when used as the first argument to Callable, but according to PEP 612,
it can also be used when instantiating user-defined generic classes
with ParamSpec parameters.
This commit is contained in:
John Seong
2026-04-23 10:46:04 +08:00
committed by GitHub
parent bd7352d807
commit 75ff1afcb6
1 changed files with 2 additions and 1 deletions
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Doc/library/typing.rst
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@@ -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 (``...``).