src/test/ui/never-assign-dead-code.rs

// Copyright 2015 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.

// Test that an assignment of type ! makes the rest of the block dead code.

#![feature(never_type)]
#![feature(rustc_attrs)]
#![warn(unused)]

#[rustc_error]
fn main() { //~ ERROR: compilation successful
    let x: ! = panic!("aah"); //~ WARN unused
    drop(x); //~ WARN unreachable
    //~^ WARN unreachable
}