| // Copyright 2018 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. |
| |
| // compile-pass |
| |
| #![crate_type="lib"] |
| |
| #![feature(never_type)] |
| #![allow(dead_code)] |
| #![allow(unreachable_code)] |
| #![allow(unused_variables)] |
| |
| struct Foo; |
| |
| pub fn f(x: !) -> ! { |
| x |
| } |
| |
| pub fn ub() { |
| // This is completely undefined behaviour, |
| // but we still want to make sure it compiles. |
| let x: ! = unsafe { |
| std::mem::transmute::<Foo, !>(Foo) |
| }; |
| f(x) |
| } |