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rust-clippy/tests/compile-fail/patterns.rs

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#![feature(plugin)]
#![plugin(clippy)]
#![allow(unused)]
#![deny(clippy)]
fn main() {
let v = Some(true);
match v {
Some(x) => (),
y @ _ => (), //~ERROR the `y @ _` pattern can be written as just `y`
}
match v {
Some(x) => (),
y @ None => (), // no error
}
}