52         needle: u8, data: Vec<u8>, take_side: Vec<bool>
58         let iter = Memchr::new(needle, &data);
62         all_found.iter().cloned().eq(positions1(needle, &data))
98         let needle = 0;  localVariable
99         let answer = positions1(needle, &data);
100         answer.eq(Memchr::new(needle, &data))
104         let needle = 0;  localVariable
105         let answer = positions1(needle, &data);
106         answer.rev().eq(Memchr::new(needle, &data).rev())
141         let needle = 0;  localVariable
142         let mut iter = Memchr::new(needle, &data);
145             .filter(|&&elt| elt == needle)