src/test/run-pass/logging-only-prints-once.rs

   1 // Copyright 2013-2014 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 // ignore-windows
  12 // exec-env:RUST_LOG=debug
  13
  14 use std::cell::Cell;
  15 use std::fmt;
  16 use std::thread;
  17
  18 struct Foo(Cell<isize>);
  19
  20 impl fmt::Debug for Foo {
  21     fn fmt(&self, _fmt: &mut fmt::Formatter) -> fmt::Result {
  22         let Foo(ref f) = *self;
  23         assert!(f.get() == 0);
  24         f.set(1);
  25         Ok(())
  26     }
  27 }
  28
  29 pub fn main() {
  30     thread::spawn(move|| {
  31         let mut f = Foo(Cell::new(0));
  32         println!("{:?}", f);
  33         let Foo(ref mut f) = f;
  34         assert!(f.get() == 1);
  35     }).join().ok().unwrap();
  36 }