j := index(buf, 'x')
			if j != n-1 {
				b.Fatal("bad index", j)
			}
		}
		buf[n-1] = '\x00'
	}
}

func bmIndexRune(index func([]byte, rune) int) func(b *testing.B, n int) {
	return func(b *testing.B, n int) {
		buf := bmbuf[0:n]
		utf8.EncodeRune(buf[n-3:], '世')
		for i := 0; i < b.N; i++ {
			j := index(buf, '世')
			if j != n-3 {
				b.Fatal("bad index", j)
			}
		}
		buf[n-3] = '\x00'

	{7, "E2BIG", "argument list too long"},
	{8, "ENOEXEC", "exec format error"},
	{9, "EBADF", "bad file descriptor"},
	{10, "ECHILD", "no child processes"},
	{11, "EDEADLK", "resource deadlock avoided"},
	{12, "ENOMEM", "cannot allocate memory"},
	{13, "EACCES", "permission denied"},
	{14, "EFAULT", "bad address"},
	{15, "ENOTBLK", "block device required"},
	{16, "EBUSY", "device busy"},

	{7, "E2BIG", "argument list too long"},
	{8, "ENOEXEC", "exec format error"},
	{9, "EBADF", "bad file descriptor"},
	{10, "ECHILD", "no child processes"},
	{11, "EDEADLK", "resource deadlock avoided"},
	{12, "ENOMEM", "cannot allocate memory"},
	{13, "EACCES", "permission denied"},
	{14, "EFAULT", "bad address"},
	{15, "ENOTBLK", "block device required"},
	{16, "EBUSY", "device busy"},

	{7, "E2BIG", "argument list too long"},
	{8, "ENOEXEC", "exec format error"},
	{9, "EBADF", "bad file descriptor"},
	{10, "ECHILD", "no child processes"},
	{11, "EDEADLK", "resource deadlock avoided"},
	{12, "ENOMEM", "cannot allocate memory"},
	{13, "EACCES", "permission denied"},
	{14, "EFAULT", "bad address"},
	{15, "ENOTBLK", "block device required"},
	{16, "EBUSY", "device busy"},

func (b *byteWithMarshalJSON) UnmarshalJSON(data []byte) error {
	if len(data) != 5 || data[0] != '"' || data[1] != 'Z' || data[4] != '"' {
		return fmt.Errorf("bad quoted string")
	}
	i, err := strconv.ParseInt(string(data[2:4]), 16, 8)
	if err != nil {
		return fmt.Errorf("bad hex")
	}
	*b = byteWithMarshalJSON(i)
	return nil
}

type byteWithPtrMarshalJSON byte

	{7, "E2BIG", "argument list too long"},
	{8, "ENOEXEC", "exec format error"},
	{9, "EBADF", "bad file descriptor"},
	{10, "ECHILD", "no child processes"},
	{11, "EDEADLK", "resource deadlock avoided"},
	{12, "ENOMEM", "cannot allocate memory"},
	{13, "EACCES", "permission denied"},
	{14, "EFAULT", "bad address"},
	{15, "ENOTBLK", "block device required"},
	{16, "EBUSY", "device busy"},

	{7, "E2BIG", "argument list too long"},
	{8, "ENOEXEC", "exec format error"},
	{9, "EBADF", "bad file descriptor"},
	{10, "ECHILD", "no child processes"},
	{11, "EDEADLK", "resource deadlock avoided"},
	{12, "ENOMEM", "cannot allocate memory"},
	{13, "EACCES", "permission denied"},
	{14, "EFAULT", "bad address"},
	{15, "ENOTBLK", "block device required"},
	{16, "EBUSY", "device busy"},

	{7, "E2BIG", "argument list too long"},
	{8, "ENOEXEC", "exec format error"},
	{9, "EBADF", "bad file descriptor"},
	{10, "ECHILD", "no child processes"},
	{11, "EDEADLK", "resource deadlock avoided"},
	{12, "ENOMEM", "cannot allocate memory"},
	{13, "EACCES", "permission denied"},
	{14, "EFAULT", "bad address"},
	{15, "ENOTBLK", "block device required"},
	{16, "EBUSY", "device busy"},

			errstr: "zones cannot be present",
		},
		{
			prefix: "1.1.1.0/+32",
			errstr: "bad bits",
		},
		{
			prefix: "1.1.1.0/-32",
			errstr: "bad bits",
		},
		{
			prefix: "1.1.1.0/032",
			errstr: "bad bits",
		},
		{
			prefix: "1.1.1.0/0032",
			errstr: "bad bits",
		},
	}
	for _, test := range tests {
		t.Run(test.prefix, func(t *testing.T) {

	{7, "E2BIG", "argument list too long"},
	{8, "ENOEXEC", "exec format error"},
	{9, "EBADF", "bad file descriptor"},
	{10, "ECHILD", "no child processes"},
	{11, "EDEADLK", "resource deadlock avoided"},
	{12, "ENOMEM", "cannot allocate memory"},
	{13, "EACCES", "permission denied"},
	{14, "EFAULT", "bad address"},
	{15, "ENOTBLK", "block device required"},
	{16, "EBUSY", "device busy"},