Trailing parenthesized function return type comment becomes leading comment

[MichaReiser]

def foo(
    arg: (  # comment with non-return annotation
        int
        # comment with non-return annotation
    ),
):
    pass


def foo(
    arg: (  # comment with non-return annotation
        int
        | range
        | memoryview
        # comment with non-return annotation
    ),
):
    pass

def foo(arg: (
        int
        # only after
)):
    pass

Output

def foo(
    # comment with non-return annotation
    # comment with non-return annotation
    arg: (int),
):
    pass


def foo(
    # comment with non-return annotation
    # comment with non-return annotation
    arg: (int | range | memoryview),
):
    pass


def foo(
    # only after
    arg: (int),
):
    pass

Found by going through the tests in psf/black#4453