standback 0.3.3

New standard library, old compiler.
Documentation 
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use crate::pattern::{Pattern, ReverseSearcher};
use crate::traits::{Sealed, SignedInteger};

pub trait int_v1_45: SignedInteger {
    fn saturating_neg(self) -> Self;
    fn saturating_abs(self) -> Self;
}

macro_rules! impl_int_v1_45 {
    ($($type:ident),*) => {$(
        impl int_v1_45 for $type {
            fn saturating_neg(self) -> Self {
                if self == core::$type::MIN {
                    core::$type::MAX
                } else {
                    -self
                }
            }

            fn saturating_abs(self) -> Self {
                if self.is_negative() {
                    self.saturating_neg()
                } else {
                    self
                }
            }
        }
    )*};
}

impl_int_v1_45![i8, i16, i32, i64, i128, isize];

pub trait str_v1_45: Sealed<str> {
    fn strip_prefix<'a, P: Pattern<'a>>(&'a self, prefix: P) -> Option<&'a str>;
    fn strip_suffix<'a, P>(&'a self, suffix: P) -> Option<&'a str>
    where
        P: Pattern<'a>,
        <P as Pattern<'a>>::Searcher: ReverseSearcher<'a>;
}

impl str_v1_45 for str {
    #[must_use = "this returns the remaining substring as a new slice, without modifying the \
                  original"]
    fn strip_prefix<'a, P: Pattern<'a>>(&'a self, prefix: P) -> Option<&'a str> {
        prefix.strip_prefix_of(self)
    }

    #[must_use = "this returns the remaining substring as a new slice, without modifying the \
                  original"]
    fn strip_suffix<'a, P>(&'a self, suffix: P) -> Option<&'a str>
    where
        P: Pattern<'a>,
        <P as Pattern<'a>>::Searcher: ReverseSearcher<'a>,
    {
        suffix.strip_suffix_of(self)
    }
}