a: int | None = None

def f(v: int) -> int:
    pass

def f2(v: int) -> int:
    a = 5

f(a)

class Test:
    def __init__(self):
        self.a: int | None = None

    def f(self, v: int) -> int:
        pass

    def f2(self):
        self.a = 5
        self.f(self.a)