Junk string
	}
	var input []*s
	var output []*s
	t.Run("inner", func(t *testing.T) {
		a := &s{"a"}
		b := &s{"b"}
		// Check that we can garbage collect elements when we delete them.
		leak.MustGarbageCollect(t, b)
		input = []*s{a, b}
		output = Delete(input, 1)
	})
	assert.Equal(t, output, []*s{{"a"}})
	assert.Equal(t, input, []*s{{"a"}, nil})
}

func TestContains(t *testing.T) {