Invalid infer generic type for contravariant TypeVar inside function call

from typing import Generic, TypeVar


T_contra = TypeVar('T_contra', contravariant=True)


class Animal:
    pass


class Cat(Animal):
    pass


class AnimalBox(Generic[T_contra]):
    def __init__(self, animal: T_contra):
        pass


def print_box(a: AnimalBox[Cat]):
    pass


animal = Animal()

print_box(AnimalBox(animal))  # error: Argument 1 to "AnimalBox" has incompatible type "Animal"; expected "Cat"

box = AnimalBox(animal)
print_box(box)  # OK

Reproduces only on contravariants. Covariants seems to be OK.
Tested on: mypy-0.680+dev.69eaf88a0b03e9f491cc22534c2d30f1d21832b2

Start by running the Python reproduction from the issue and compare the direct constructor call with the intermediate AnimalBox assignment. Investigate generic type inference for contravariant TypeVars during function calls. Done means the direct print_box(AnimalBox(animal)) case is accepted consistently with the intermediate assignment, with a regression test covering the behavior.