impl str {
    pub fn trim_prefix<P>(&self, prefix: P) -> &str
    where
        P: Pattern;

    pub fn trim_suffix<P>(&self, suffix: P) -> &str
    where
        P: Pattern,
        for<'a> P::Searcher<'a>: ReverseSearcher<'a>;
}

impl [T] {
    pub fn trim_prefix<P>(&self, prefix: &P) -> &[T]
    where
        P: SlicePattern<Item = T> + ?Sized,
        T: PartialEq;

    pub fn trim_suffix<P>(&self, suffix: &P) -> &[T]
    where
        P: SlicePattern<Item = T> + ?Sized,
        T: PartialEq;
}

impl Path {
    pub fn trim_prefix<P>(&self, base: P) -> &Path
    where
        P: AsRef<Path>;
}