Guido van Rossum <gu...@python.org> added the comment:
I think I have a shorter repro, not involving unions:
from typing import *
T = TypeVar("T")
S = TypeVar("S")
U = TypeVar("U")
class A(Generic[T]): ...
class B(Generic[T]): ...
class C(Generic[T, S]): ...
print(C[A[U], B[int]][str])
Fails in the same place, works in 3.8 (I didn't check just before the offending
commit), and the same fix works.
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40397>
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