pyright should reject *Ts as a type param in a TypeAliasType definition

[hamdanal]

It is not really called out in PEP 695 but it seems it should be rejected. Consider this example:

from typing_extensions import TypeAliasType, TypeVarTuple, Unpack

Ts = TypeVarTuple("Ts")

Alias1 = TypeAliasType("Alias1", tuple[*Ts], type_params=(Ts,))  # pyright: OK
Alias2 = TypeAliasType("Alias2", tuple[*Ts], type_params=(*Ts,))  # pyright: OK <- false negative?
Alias3 = TypeAliasType("Alias3", tuple[*Ts], type_params=(Unpack[Ts],))  # pyright: Error

I noticed this while adding support to TypeAliasType in mypy python/mypy#16926 which in its current state rejects Alias2 and Alias3 above while pyright only emits an error on Alias3 usage.

versions:
pyright 1.1.350
python 3.11

[erictraut]

Thanks for filing the issue. I agree this is a false negative condition.

It will be addressed in the next release.

[erictraut]

This is addressed in pyright 1.1.351, which I just published.