src/test/ui/run-pass/functions-closures/return-from-closure.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 // just to make sure that `return` is only returning from the closure,
  14 // not the surrounding function.
  15
  16 static mut calls: usize = 0;
  17
  18 fn surrounding() {
  19     let return_works = |n: isize| {
  20         unsafe { calls += 1 }
  21
  22         if n >= 0 { return; }
  23         panic!()
  24     };
  25
  26     return_works(10);
  27     return_works(20);
  28
  29     let return_works_proc = |n: isize| {
  30         unsafe { calls += 1 }
  31
  32         if n >= 0 { return; }
  33         panic!()
  34     };
  35
  36     return_works_proc(10);
  37 }
  38
  39 pub fn main() {
  40     surrounding();
  41
  42     assert_eq!(unsafe {calls}, 3);
  43 }