1 // run-pass
2 #![feature(extern_types)]
3 
4 use std::mem::{align_of_val, size_of_val};
5 
6 extern "C" {
7     type A;
8 }
9 
main()10 fn main() {
11     let x: &A = unsafe { &*(1usize as *const A) };
12 
13     assert_eq!(size_of_val(x), 0);
14     assert_eq!(align_of_val(x), 1);
15 }
16