def get_impl(self, dispatcher):
        """
        Get the single implementation (a C function object) of a dispatcher.
        """
        self.assertEqual(len(dispatcher.overloads), 1)
        cres = list(dispatcher.overloads.values())[0]
        return cres.entry_point

        Get the single implementation (a C function object) of a dispatcher.
        
numba/tests/test_func_lifetime.py