src/test/run-pass/objects-coerce-freeze-borrored.rs

   1 // Copyright 2012 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 // Test that we can coerce an `@Object` to an `&Object`
  12
  13 // pretty-expanded FIXME #23616
  14
  15 trait Foo {
  16     fn foo(&self) -> usize;
  17     fn bar(&mut self) -> usize;
  18 }
  19
  20 impl Foo for usize {
  21     fn foo(&self) -> usize {
  22         *self
  23     }
  24
  25     fn bar(&mut self) -> usize {
  26         *self += 1;
  27         *self
  28     }
  29 }
  30
  31 fn do_it_mut(obj: &mut Foo) {
  32     let x = obj.bar();
  33     let y = obj.foo();
  34     assert_eq!(x, y);
  35
  36     do_it_imm(obj, y);
  37 }
  38
  39 fn do_it_imm(obj: &Foo, v: usize) {
  40     let y = obj.foo();
  41     assert_eq!(v, y);
  42 }
  43
  44 pub fn main() {
  45     let mut x: usize = 22;
  46     let obj = &mut x as &mut Foo;
  47     do_it_mut(obj);
  48     do_it_imm(obj, 23);
  49     do_it_mut(obj);
  50 }