possible dupe of https://github.com/python/mypy/issues/9527

tupleCallType.py

def double(x: int) -> int:
    return x * 2

def add(x: int, y: int) -> int:
    return x + y

def doubleAndAdd(x: int, y: int) -> None:
    steps = (
        (double, (x,)),
        (add, (x, y)),
    )
    for func, args in steps:
        func(*args)  # error: Cannot call function of unknown type

def doubleTwice(x: int, y: int) -> None:
    steps = (
        (double, (x, )),
        (double, (y, )),
    )
    for func, args in steps:
        func(*args)  # passes