src/test/run-pass/statics/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 // run-pass
  12 #![allow(non_upper_case_globals)]
  13
  14 // Constants (static variables) can be used to match in patterns, but mutable
  15 // statics cannot. This ensures that there's some form of error if this is
  16 // attempted.
  17
  18 // aux-build:static_mut_xc.rs
  19
  20
  21 extern crate static_mut_xc;
  22
  23 unsafe fn static_bound(_: &'static isize) {}
  24
  25 fn static_bound_set(a: &'static mut isize) {
  26     *a = 3;
  27 }
  28
  29 unsafe fn run() {
  30     assert_eq!(static_mut_xc::a, 3);
  31     static_mut_xc::a = 4;
  32     assert_eq!(static_mut_xc::a, 4);
  33     static_mut_xc::a += 1;
  34     assert_eq!(static_mut_xc::a, 5);
  35     static_mut_xc::a *= 3;
  36     assert_eq!(static_mut_xc::a, 15);
  37     static_mut_xc::a = -3;
  38     assert_eq!(static_mut_xc::a, -3);
  39     static_bound(&static_mut_xc::a);
  40     static_bound_set(&mut static_mut_xc::a);
  41 }
  42
  43 pub fn main() {
  44     unsafe { run() }
  45 }
  46
  47 pub mod inner {
  48     pub static mut a: isize = 4;
  49 }