src/test/run-pass/zero-size-type-destructors.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 #![feature(unsafe_no_drop_flag)]
  12
  13 static mut destructions : int = 3;
  14
  15 pub fn foo() {
  16     #[unsafe_no_drop_flag]
  17     struct Foo;
  18
  19     impl Drop for Foo {
  20         fn drop(&mut self) {
  21           unsafe { destructions -= 1 };
  22         }
  23     };
  24
  25     let _x = [Foo, Foo, Foo];
  26 }
  27
  28 pub fn main() {
  29   foo();
  30   assert!((unsafe { destructions } == 0));
  31 }