src/test/run-pass/newtype-struct-drop-run.rs

   1 // Copyright 2013 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 // Make sure the destructor is run for newtype structs.
  12
  13 use std::cell::Cell;
  14
  15 struct Foo<'a>(&'a Cell<isize>);
  16
  17 impl<'a> Drop for Foo<'a> {
  18     fn drop(&mut self) {
  19         let Foo(i) = *self;
  20         i.set(23);
  21     }
  22 }
  23
  24 pub fn main() {
  25     let y = &Cell::new(32);
  26     {
  27         let _x = Foo(y);
  28     }
  29     assert_eq!(y.get(), 23);
  30 }