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fn strip_lf(s: &str) -> &str {
s.strip_suffix(b'\n').unwrap_or(s)
//~^ ERROR the trait bound `u8: Pattern` is not satisfied
//~| NOTE required by a bound introduced by this call
//~| NOTE the trait `FnMut(char)` is not implemented for `u8`
//~| HELP the following other types implement trait `Pattern`:
//~| NOTE required for `u8` to implement `Pattern`
//~| NOTE required by a bound in `core::str::<impl str>::strip_suffix`
}
fn main() {}
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