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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 // Non-copy
14 struct A;
15 struct B;
16
17 union U {
18 a: A,
19 b: B,
20 }
21
22 fn main() {
23 unsafe {
24 {
25 let mut u = U { a: A };
26 let a = u.a;
27 let a = u.a; //~ ERROR use of moved value: `u.a`
28 }
29 {
30 let mut u = U { a: A };
31 let a = u.a;
32 u.a = A;
33 let a = u.a; // OK
34 }
35 {
36 let mut u = U { a: A };
37 let a = u.a;
38 u.b = B;
39 let a = u.a; // OK
40 }
41 }
42 }