rust/src/test/run-pass/rfcs/rfc-2175-or-if-while-let/basic.rs

// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// 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.

// run-pass
#![feature(if_while_or_patterns)]

enum E {
    V(u8),
    U(u8),
    W,
}
use E::*;

fn main() {
    let mut e = V(10);

    if let V(x) | U(x) = e {
        assert_eq!(x, 10);
    }
    while let V(x) | U(x) = e {
        assert_eq!(x, 10);
        e = W;
    }
}