src/test/run-pass/mut-function-arguments.rs

   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
  12 #![allow(unknown_features)]
  13 #![feature(box_syntax)]
  14
  15 fn f(mut y: Box<isize>) {
  16     *y = 5;
  17     assert_eq!(*y, 5);
  18 }
  19
  20 fn g() {
  21     let frob = |mut q: Box<isize>| { *q = 2; assert!(*q == 2); };
  22     let w = box 37;
  23     frob(w);
  24
  25 }
  26
  27 pub fn main() {
  28     let z = box 17;
  29     f(z);
  30     g();
  31 }