src/test/run-pass/extern-types-size_of_val.rs

   1 // Copyright 2017 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 #![feature(extern_types)]
  12
  13 use std::mem::{size_of_val, align_of_val};
  14
  15 extern {
  16     type A;
  17 }
  18
  19 fn main() {
  20     let x: &A = unsafe {
  21         &*(1usize as *const A)
  22     };
  23
  24     assert_eq!(size_of_val(x), 0);
  25     assert_eq!(align_of_val(x), 1);
  26 }