src/test/compile-fail/borrowck-no-cycle-in-exchange-heap.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 #![feature(box_syntax)]
  12
  13 struct node_ {
  14     a: Box<cycle>
  15 }
  16
  17 enum cycle {
  18     node(node_),
  19     empty
  20 }
  21 fn main() {
  22     let mut x: Box<_> = box cycle::node(node_ {a: box cycle::empty});
  23     // Create a cycle!
  24     match *x {
  25       cycle::node(ref mut y) => {
  26         y.a = x; //~ ERROR cannot move out of
  27       }
  28       cycle::empty => {}
  29     };
  30 }