src/test/ui/reachable/expr_add.rs


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// Copyright 2016 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.
#![feature(never_type)]
#![allow(unused_variables)]
#![deny(unreachable_code)]

use std::ops;

struct Foo;

impl ops::Add<!> for Foo {
    type Output = !;
    fn add(self, rhs: !) -> ! {
        unimplemented!()
    }
}

fn main() {
    let x = Foo + return; //~ ERROR unreachable
}