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1 | // Copyright 2013 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 | // Test that attempt to mutably borrow `&mut` pointer while pointee is | |
12 | // borrowed yields an error. | |
13 | // | |
c34b1796 | 14 | // Example from src/librustc_borrowck/borrowck/README.md |
1a4d82fc JJ |
15 | |
16 | fn foo<'a>(mut t0: &'a mut isize, | |
17 | mut t1: &'a mut isize) { | |
18 | let p: &isize = &*t0; // Freezes `*t0` | |
19 | let mut t2 = &mut t0; //~ ERROR cannot borrow `t0` | |
20 | **t2 += 1; // Mutates `*t0` | |
21 | } | |
22 | ||
23 | fn bar<'a>(mut t0: &'a mut isize, | |
24 | mut t1: &'a mut isize) { | |
25 | let p: &mut isize = &mut *t0; // Claims `*t0` | |
26 | let mut t2 = &mut t0; //~ ERROR cannot borrow `t0` | |
27 | **t2 += 1; // Mutates `*t0` but not through `*p` | |
28 | } | |
29 | ||
30 | fn main() { | |
31 | } |