return nil
	}
	return a[0:2]
}

// FindReaderIndex returns a two-element slice of integers defining the
// location of the leftmost match of the regular expression in text read from
// the [io.RuneReader]. The match text was found in the input stream at
// byte offset loc[0] through loc[1]-1.
// A return value of nil indicates no match.
func (re *Regexp) FindReaderIndex(r io.RuneReader) (loc []int) {

		testFindIndex(&test, MustCompile(test.pat).FindStringIndex(test.text), t)
	}
}

func TestFindReaderIndex(t *testing.T) {
	for _, test := range findTests {
		testFindIndex(&test, MustCompile(test.pat).FindReaderIndex(strings.NewReader(test.text)), t)
	}
}

// Now come the simple All cases.

func TestFindAll(t *testing.T) {
	for _, test := range findTests {

		{"(*Regexp).FindAllStringSubmatchIndex", Method, 0},
		{"(*Regexp).FindAllSubmatch", Method, 0},
		{"(*Regexp).FindAllSubmatchIndex", Method, 0},
		{"(*Regexp).FindIndex", Method, 0},
		{"(*Regexp).FindReaderIndex", Method, 0},
		{"(*Regexp).FindReaderSubmatchIndex", Method, 0},
		{"(*Regexp).FindString", Method, 0},
		{"(*Regexp).FindStringIndex", Method, 0},
		{"(*Regexp).FindStringSubmatch", Method, 0},

pkg regexp, method (*Regexp) FindAllSubmatch([]uint8, int) [][][]uint8
pkg regexp, method (*Regexp) FindAllSubmatchIndex([]uint8, int) [][]int
pkg regexp, method (*Regexp) FindIndex([]uint8) []int
pkg regexp, method (*Regexp) FindReaderIndex(io.RuneReader) []int
pkg regexp, method (*Regexp) FindReaderSubmatchIndex(io.RuneReader) []int
pkg regexp, method (*Regexp) FindString(string) string
pkg regexp, method (*Regexp) FindStringIndex(string) []int