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
  15 extern crate traitimpl;
  16 use traitimpl::Bar;
  17
  18 static mut COUNT: usize = 1;
  19
  20 trait T {
  21     fn t(&self) {}
  22 }
  23
  24 impl<'a> T+'a {
  25     fn foo(&self) {
  26         unsafe { COUNT *= 2; }
  27     }
  28     fn bar() {
  29         unsafe { COUNT *= 3; }
  30     }
  31 }
  32
  33 impl T for isize {}
  34
  35 struct Foo;
  36 impl<'a> Bar<'a> for Foo {}
  37
  38 fn main() {
  39     let x: &T = &42;
  40
  41     x.foo();
  42     T::foo(x);
  43     T::bar();
  44
  45     unsafe { assert!(COUNT == 12); }
  46
  47     // Cross-crait case
  48     let x: &Bar = &Foo;
  49     x.bar();
  50 }