src/test/run-pass/static-mut-xc.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 // Constants (static variables) can be used to match in patterns, but mutable
  12 // statics cannot. This ensures that there's some form of error if this is
  13 // attempted.
  14
  15 // aux-build:static_mut_xc.rs
  16
  17
  18 extern crate static_mut_xc;
  19
  20 unsafe fn static_bound(_: &'static isize) {}
  21
  22 fn static_bound_set(a: &'static mut isize) {
  23     *a = 3;
  24 }
  25
  26 unsafe fn run() {
  27     assert_eq!(static_mut_xc::a, 3);
  28     static_mut_xc::a = 4;
  29     assert_eq!(static_mut_xc::a, 4);
  30     static_mut_xc::a += 1;
  31     assert_eq!(static_mut_xc::a, 5);
  32     static_mut_xc::a *= 3;
  33     assert_eq!(static_mut_xc::a, 15);
  34     static_mut_xc::a = -3;
  35     assert_eq!(static_mut_xc::a, -3);
  36     static_bound(&static_mut_xc::a);
  37     static_bound_set(&mut static_mut_xc::a);
  38 }
  39
  40 pub fn main() {
  41     unsafe { run() }
  42 }
  43
  44 pub mod inner {
  45     pub static mut a: isize = 4;
  46 }