rust-clippy/tests/ui/match_as_ref.fixed

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#![allow(unused)]
#![warn(clippy::match_as_ref)]
fn match_as_ref() {
let owned: Option<()> = None;
let borrowed: Option<&()> = owned.as_ref();
let mut mut_owned: Option<()> = None;
let borrow_mut: Option<&mut ()> = mut_owned.as_mut();
}
mod issue4437 {
use std::error::Error;
use std::fmt;
use std::num::ParseIntError;
#[derive(Debug)]
struct E {
source: Option<ParseIntError>,
}
impl Error for E {
fn source(&self) -> Option<&(dyn Error + 'static)> {
self.source.as_ref().map(|x| x as _)
}
}
impl fmt::Display for E {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
unimplemented!()
}
}
}
fn main() {
// Don't lint
let _ = match Some(0) {
#[cfg(feature = "foo")]
Some(ref x) if *x > 50 => None,
Some(ref x) => Some(x),
None => None,
};
}