]>
Commit | Line | Data |
---|---|---|
1a4d82fc JJ |
1 | // Copyright 2014 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 | use std::ops::Deref; | |
12 | ||
13 | struct MyPtr<'a>(&'a mut usize); | |
14 | impl<'a> Deref for MyPtr<'a> { | |
15 | type Target = usize; | |
16 | ||
17 | fn deref<'b>(&'b self) -> &'b usize { self.0 } | |
18 | } | |
19 | ||
20 | trait Tr { | |
21 | fn poke(&self, s: &mut usize); | |
22 | } | |
23 | ||
24 | impl Tr for usize { | |
25 | fn poke(&self, s: &mut usize) { | |
26 | *s = 2; | |
27 | } | |
28 | } | |
29 | ||
30 | fn main() { | |
c34b1796 | 31 | let s = &mut 1; |
1a4d82fc JJ |
32 | |
33 | MyPtr(s).poke(s); | |
34 | //~^ ERROR cannot borrow `*s` as mutable more than once at a time | |
35 | } |