src/test/compile-fail/union/union-derive-eq.rs

   1 // Copyright 2016 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(untagged_unions)]
  12
  13 #[derive(Eq)] // OK
  14 union U1 {
  15     a: u8,
  16 }
  17
  18 impl PartialEq for U1 { fn eq(&self, rhs: &Self) -> bool { true } }
  19
  20 #[derive(PartialEq)]
  21 struct PartialEqNotEq;
  22
  23 #[derive(Eq)]
  24 union U2 {
  25     a: PartialEqNotEq, //~ ERROR the trait bound `PartialEqNotEq: std::cmp::Eq` is not satisfied
  26 }
  27
  28 impl PartialEq for U2 { fn eq(&self, rhs: &Self) -> bool { true } }
  29
  30 fn main() {}