| // 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. |
| |
| #![feature(box_syntax)] |
| |
| fn borrow<F>(v: &isize, f: F) where F: FnOnce(&isize) { |
| f(v); |
| } |
| |
| fn box_imm() { |
| let mut v: Box<_> = box 3; |
| borrow(&*v, |
| |w| { //~ ERROR cannot borrow `v` as mutable |
| v = box 4; |
| assert_eq!(*v, 3); |
| assert_eq!(*w, 4); |
| }) |
| } |
| |
| fn main() { |
| } |
