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#![allow(dead_code)]

pub fn memchr(n1: u8, haystack: &[u8]) -> Option<usize> {
    haystack
        .iter()
        .position(|&b| b == n1)
}

pub fn memchr2(n1: u8, n2: u8, haystack: &[u8]) -> Option<usize> {
    haystack
        .iter()
        .position(|&b| b == n1 || b == n2)
}

pub fn memchr3(n1: u8, n2: u8, n3: u8, haystack: &[u8]) -> Option<usize> {
    haystack
        .iter()
        .position(|&b| b == n1 || b == n2 || b == n3)
}

pub fn memrchr(n1: u8, haystack: &[u8]) -> Option<usize> {
    haystack
        .iter()
        .rposition(|&b| b == n1)
}

pub fn memrchr2(n1: u8, n2: u8, haystack: &[u8]) -> Option<usize> {
    haystack
        .iter()
        .rposition(|&b| b == n1 || b == n2)
}

pub fn memrchr3(n1: u8, n2: u8, n3: u8, haystack: &[u8]) -> Option<usize> {
    haystack
        .iter()
        .rposition(|&b| b == n1 || b == n2 || b == n3)
}