rust-clippy/tests/ui/patterns.rs

// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#![allow(unused)]
#![warn(clippy::all)]

fn main() {
    let v = Some(true);
    match v {
        Some(x) => (),
        y @ _ => (),
    }
    match v {
        Some(x) => (),
        y @ None => (), // no error
    }
}