src/test/run-pass/trait-impl.rs

   1 // Copyright 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 // Test calling methods on an impl for a bare trait.
  12
  13 // aux-build:traitimpl.rs
  14 extern crate traitimpl;
  15 use traitimpl::Bar;
  16
  17 static mut COUNT: uint = 1;
  18
  19 trait T {
  20     fn t(&self) {}
  21 }
  22
  23 impl<'a> T+'a {
  24     fn foo(&self) {
  25         unsafe { COUNT *= 2; }
  26     }
  27     fn bar() {
  28         unsafe { COUNT *= 3; }
  29     }
  30 }
  31
  32 impl T for int {}
  33
  34 struct Foo;
  35 impl<'a> Bar<'a> for Foo {}
  36
  37 fn main() {
  38     let x: &T = &42;
  39
  40     x.foo();
  41     T::foo(x);
  42     T::bar();
  43
  44     unsafe { assert!(COUNT == 12); }
  45
  46     // Cross-crait case
  47     let x: &Bar = &Foo;
  48     x.bar();
  49 }