tests/ui/union/union-trait-impl.rs

   1 // run-pass
   2 // revisions: mirunsafeck thirunsafeck
   3 // [thirunsafeck]compile-flags: -Z thir-unsafeck
   4
   5 use std::fmt;
   6
   7 union U {
   8     a: u8
   9 }
  10
  11 impl fmt::Display for U {
  12     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  13         unsafe { write!(f, "Oh hai {}", self.a) }
  14     }
  15 }
  16
  17 fn main() {
  18     assert_eq!(U { a: 2 }.to_string(), "Oh hai 2");
  19 }