Function searcher_kind_one_byte 

unsafe fn searcher_kind_one_byte(
    searcher: &Searcher,
    _prestate: &mut PrefilterState,
    haystack: &[u8],
    _needle: &[u8],
) -> Option<usize>

Reads from the one_byte field of SearcherKind to handle the case of searching for a single byte needle. Works on all platforms.

Safety

Callers must ensure that the searcher.kind.one_byte union field is set.