src/test/run-pass/unboxed-closures-infer-fnonce-move.rs

   1 // Copyright 2015 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(unsafe_destructor)]
  12
  13 // Test that we are able to infer a suitable kind for this `move`
  14 // closure that is just called (`FnOnce`).
  15
  16 use std::mem;
  17
  18 struct DropMe<'a>(&'a mut i32);
  19
  20 #[unsafe_destructor]
  21 impl<'a> Drop for DropMe<'a> {
  22     fn drop(&mut self) {
  23         *self.0 += 1;
  24     }
  25 }
  26
  27 fn main() {
  28     let mut counter = 0;
  29
  30     {
  31         let drop_me = DropMe(&mut counter);
  32         let tick = move || mem::drop(drop_me);
  33         tick();
  34     }
  35
  36     assert_eq!(counter, 1);
  37 }