src/test/compile-fail/union/union-derive-clone.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(Clone)] //~ ERROR the trait bound `U1: std::marker::Copy` is not satisfied
  14 union U1 {
  15     a: u8,
  16 }
  17
  18 #[derive(Clone)]
  19 union U2 {
  20     a: u8, // OK
  21 }
  22
  23 impl Copy for U2 {}
  24
  25 #[derive(Clone, Copy)]
  26 union U3 {
  27     a: u8, // OK
  28 }
  29
  30 #[derive(Clone, Copy)]
  31 union U4<T> {
  32     a: T, // OK
  33 }
  34
  35 #[derive(Clone)]
  36 struct CloneNoCopy;
  37
  38 fn main() {
  39     let u = U4 { a: CloneNoCopy };
  40     let w = u.clone(); //~ ERROR no method named `clone` found for type `U4<CloneNoCopy>`
  41 }