{`^a((?:[bcd])+)$`, true},
	{`^a(:?b|c)*d$`, true},
	{`^.bc(d|e)*$`, true},
	{`^(?:(?:aa)|.)$`, false},
	{`^(?:(?:a{1,2}){1,2})$`, false},
	{`^l` + strings.Repeat("o", 2<<8) + `ng$`, true},
}

func TestCompileOnePass(t *testing.T) {
	var (
		p   *syntax.Prog
		re  *syntax.Regexp
		err error
	)
	for _, test := range onePassTests {
		if re, err = syntax.Parse(test.re, syntax.Perl); err != nil {