Unnecessary generator warning

[nickdrozd]

Because of python/mypy#14418, Mypyc emits a warning for generators: warning: Treating generator comprehension as list. But there is no need to emit this warning when the generator will be consumed in full anyway.

def f(self, xs: list[int]) -> dict[int, int]:
    return dict(
        enumerate(  # warning: Treating generator comprehension as list
            2 * x
            for x in xs
        )
    )

In this case, the warning is emitted for the enumerate generator. But the generator is immediately consumed by the dict call, and so it doesn't matter that the generator was compiled as a list.