src/test/ui/run-pass/issues/issue-10734.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 // run-pass
  12 #![allow(non_upper_case_globals)]
  13
  14 static mut drop_count: usize = 0;
  15
  16 struct Foo {
  17     dropped: bool
  18 }
  19
  20 impl Drop for Foo {
  21     fn drop(&mut self) {
  22         // Test to make sure we haven't dropped already
  23         assert!(!self.dropped);
  24         self.dropped = true;
  25         // And record the fact that we dropped for verification later
  26         unsafe { drop_count += 1; }
  27     }
  28 }
  29
  30 pub fn main() {
  31     // An `if true { expr }` statement should compile the same as `{ expr }`.
  32     if true {
  33         let _a = Foo{ dropped: false };
  34     }
  35     // Check that we dropped already (as expected from a `{ expr }`).
  36     unsafe { assert_eq!(drop_count, 1); }
  37
  38     // An `if false {} else { expr }` statement should compile the same as `{ expr }`.
  39     if false {
  40         panic!();
  41     } else {
  42         let _a = Foo{ dropped: false };
  43     }
  44     // Check that we dropped already (as expected from a `{ expr }`).
  45     unsafe { assert_eq!(drop_count, 2); }
  46 }