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)
	}

	},
	{
		[]int{1, 2, 3},
		func(i int) bool { return i < 2 },
		[]int{2, 3},
	},
	{
		[]int{10, 2, 30},
		func(i int) bool { return i >= 10 },
		[]int{2},
	},
}

func TestDeleteFunc(t *testing.T) {
	for i, test := range deleteFuncTests {
		copy := Clone(test.s)
		if got := DeleteFunc(copy, test.fn); !Equal(got, test.want) {
			t.Errorf("DeleteFunc case %d: got %v, want %v", i, got, test.want)