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PEP 696: Add section on binding rules #3427

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Sep 14, 2023
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PEP 696: Add section on binding rules #3427

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15 changes: 15 additions & 0 deletions peps/pep-0696.rst
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Expand Up @@ -382,6 +382,21 @@ Function Defaults
functions as ensuring the ``default`` is returned in every code path
where the ``TypeVarLike`` can go unsolved is too hard to implement.

Binding rules
-------------

``TypeVarLikes`` defaults should be bound by attribute access
(including call and subscript).

.. code-block:: python

class Foo[T = int]:
def meth(self) -> Self:
return self

reveal_type(Foo.meth) # type is (self: Foo[int]) -> Foo[int]


Implementation
--------------

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