t.Errorf("Call returned %d, %d, %d, %v, %d, %g, %d; want 10, 20, 30, [40, 50], 60, 70, 80", i, j, k, l, m, n, o)
	}
}

func TestMakeFuncInterface(t *testing.T) {
	fn := func(i int) int { return i }
	incr := func(in []Value) []Value {
		return []Value{ValueOf(int(in[0].Int() + 1))}
	}
	fv := MakeFunc(TypeOf(fn), incr)
	ValueOf(&fn).Elem().Set(fv)