func TestIndexAny(t *testing.T)  { runIndexAnyTests(t, IndexAny, "IndexAny", indexAnyTests) }
func TestLastIndexAny(t *testing.T) {
	runIndexAnyTests(t, LastIndexAny, "LastIndexAny", lastIndexAnyTests)
}

func TestIndexByte(t *testing.T) {
	for _, tt := range indexTests {
		if len(tt.b) != 1 {
			continue
		}
		a := []byte(tt.a)
		b := tt.b[0]

			if r == ch {
				return i
			}
		}
	}
	return -1
}

// LastIndexAny interprets s as a sequence of UTF-8-encoded Unicode code
// points. It returns the byte index of the last occurrence in s of any of
// the Unicode code points in chars. It returns -1 if chars is empty or if
// there is no code point in common.
func LastIndexAny(s []byte, chars string) int {
	if chars == "" {
		// Avoid scanning all of s.