if !Equal(mc, want) {
		t.Errorf("Copy result = %v, want %v", mc, want)
	}

	type M1 map[int]bool
	type M2 map[int]bool
	Copy(make(M1), make(M2))
}

func TestDeleteFunc(t *testing.T) {
	mc := Clone(m1)
	DeleteFunc(mc, func(int, int) bool { return false })
	if !Equal(mc, m1) {
		t.Errorf("DeleteFunc(%v, true) = %v, want %v", m1, mc, m1)
	}