src/test/run-pass/borrowck-pat-reassign-no-binding.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 pub fn main() {
  12     let mut x = None;
  13     match x {
  14       None => {
  15         // It is ok to reassign x here, because there is in
  16         // fact no outstanding loan of x!
  17         x = Some(0);
  18       }
  19       Some(_) => { }
  20     }
  21     assert_eq!(x, Some(0));
  22 }