8000 gh-102615: Fix type vars substitution of `collections.abc.Callable` and custom generics with `ParamSpec` by sobolevn · Pull Request #102681 · python/cpython · GitHub
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gh-102615: Fix type vars substitution of collections.abc.Callable and custom generics with ParamSpec #102681

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gh-102615: Fix type vars substitution of collections.abc.Callable and custom generics with ParamSpec #102681

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gh-102615: Fix type vars substitution of `collections.abc.Callable` a…
sobolevn Mar 14, 2023
a461b10
Address review
sobolevn Mar 14, 2023
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@sobolevn
sobolevn committed Mar 14, 2023
commit a461b10a5977101c76c665f2be1a9a819f9f6cd7
4 changes: 3 additions & 1 deletion Lib/_collections_abc.py
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Expand Up @@ -501,7 +501,9 @@ def __getitem__(self, item):

# This happens in cases like `Callable[P, T][[P, str], bool][int]`,
# we need to flatten the result.
if len(new_args) > 2:
if (len(new_args) > 2
and self.__parameters__
and _is_param_expr(self.__parameters__[0])):
res = []
for new_arg in new_args:
if isinstance(new_arg, tuple):
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