| // Copyright 2012 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| struct Point { |
| x: isize, |
| y: isize, |
| } |
| |
| fn a() { |
| let mut p = vec!(1); |
| |
| // Create an immutable pointer into p's contents: |
| let q: &isize = &p[0]; |
| |
| p[0] = 5; //~ ERROR cannot borrow |
| |
| println!("{}", *q); |
| } |
| |
| fn borrow<F>(_x: &[isize], _f: F) where F: FnOnce() {} |
| |
| fn b() { |
| // here we alias the mutable vector into an imm slice and try to |
| // modify the original: |
| |
| let mut p = vec!(1); |
| |
| borrow( |
| &p, |
| || p[0] = 5); //~ ERROR cannot borrow `p` as mutable |
| } |
| |
| fn c() { |
| // Legal because the scope of the borrow does not include the |
| // modification: |
| let mut p = vec!(1); |
| borrow(&p, ||{}); |
| p[0] = 5; |
| } |
| |
| fn main() { |
| } |