from typing import Tuple, Callable, Dict
import run_tests

def make_counter() -> Tuple[ Callable[ [ K ], None ], Dict[ K, int ] ]:
    ctr : Dict[ K, int ] = {}

    def fun( key: K ) -> None:
        ctr.setdefault( key, 0 )
        ctr[ key ] += 1

    return ( fun, ctr )