Unexpected "..." when assigning tuple with variable length to type alias

[DetachHead]

Foo = tuple[int, ...] # error: Unexpected "..."

https://mypy-play.net/?mypy=latest&python=3.9&flags=strict%2Ccheck-untyped-defs%2Cdisallow-any-decorated%2Cdisallow-any-expr%2Cdisallow-any-explicit%2Cdisallow-any-generics%2Cdisallow-any-unimported%2Cdisallow-incomplete-defs%2Cdisallow-subclassing-any%2Cdisallow-untyped-calls%2Cdisallow-untyped-decorators%2Cdisallow-untyped-defs%2Cwarn-incomplete-stub%2Cwarn-redundant-casts%2Cwarn-return-any%2Cwarn-unreachable%2Cwarn-unused-configs%2Cwarn-unused-ignores&gist=79574764450b7fd74e512b1ca6bd844a

related: #11098

[Zeckie]

This is valid (according to mypy):

from typing import Tuple
Foo = Tuple[int, ...]
a: Foo = (1 ,2, 3)

reveal_type(a) # note: Revealed type is "builtins.tuple[builtins.int]"

Is it that mypy can't tell whether tuple is being used as a type or a function?

from typing import Tuple
reveal_type(Tuple[int]) # note: Revealed type is "builtins.object"
reveal_type(tuple[int]) # note: Revealed type is "def (iterable: typing.Iterable[builtins.int*] =) -> builtins.tuple[builtins.int*]" 

[hauntsaninja]

I believe this was fixed (a while back) on master #10766