src/test/ui/union/union-derive-rpass.rs

   1 // run-pass
   2 #![allow(dead_code)]
   3 #![allow(unused_variables)]
   4 #![allow(unions_with_drop_fields)]
   5
   6 // Some traits can be derived for unions.
   7
   8 #![feature(untagged_unions)]
   9
  10 #[derive(
  11     Copy,
  12     Clone,
  13     Eq,
  14 )]
  15 union U {
  16     a: u8,
  17     b: u16,
  18 }
  19
  20 impl PartialEq for U { fn eq(&self, rhs: &Self) -> bool { true } }
  21
  22 #[derive(
  23     Clone,
  24     Copy,
  25     Eq
  26 )]
  27 union W<T> {
  28     a: T,
  29 }
  30
  31 impl<T> PartialEq for W<T> { fn eq(&self, rhs: &Self) -> bool { true } }
  32
  33 fn main() {
  34     let u = U { b: 0 };
  35     let u1 = u;
  36     let u2 = u.clone();
  37     assert!(u1 == u2);
  38
  39     let w = W { a: 0 };
  40     let w1 = w.clone();
  41     assert!(w == w1);
  42 }