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bpo-44633: Fix parameter substitution of the union type with wrong types. (GH-27218) (GH-27224)

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A TypeError is now raised instead of returning NotImplemented.
(cherry picked from commit 3ea5332a43)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
This commit is contained in:
Miss Islington (bot) 2021-07-18 04:59:25 -07:00 • committed by GitHub
parent 03aad3049d
commit 85b58292cf
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3 changed files with 36 additions and 16 deletions
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6
Lib/test/test_types.py
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@ -772,6 +772,12 @@ def test_union_parameter_chaining(self):
self.assertEqual((list[T] | list[S])[int, T], list[int] | list[T])
self.assertEqual((list[T] | list[S])[int, int], list[int])
def test_union_parameter_substitution_errors(self):
T = typing.TypeVar("T")
x = int | T
with self.assertRaises(TypeError):
x[42]
def test_or_type_operator_with_forward(self):
T = typing.TypeVar('T')
ForwardAfter = T | 'Forward'