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1 | // Copyright 2012 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 | // Here we check that it is allowed to lend out an element of a | |
12 | // (locally rooted) mutable, unique vector, and that we then prevent | |
13 | // modifications to the contents. | |
14 | ||
1a4d82fc | 15 | fn takes_imm_elt<F>(_v: &isize, f: F) where F: FnOnce() { |
223e47cc LB |
16 | f(); |
17 | } | |
18 | ||
19 | fn has_mut_vec_and_does_not_try_to_change_it() { | |
c30ab7b3 | 20 | let mut v: Vec<isize> = vec![1, 2, 3]; |
1a4d82fc | 21 | takes_imm_elt(&v[0], || {}) |
223e47cc LB |
22 | } |
23 | ||
24 | fn has_mut_vec_but_tries_to_change_it() { | |
c30ab7b3 | 25 | let mut v: Vec<isize> = vec![1, 2, 3]; |
1a4d82fc JJ |
26 | takes_imm_elt( |
27 | &v[0], | |
28 | || { //~ ERROR cannot borrow `v` as mutable | |
29 | v[1] = 4; | |
30 | }) | |
223e47cc LB |
31 | } |
32 | ||
33 | fn main() { | |
34 | } |