src/test/run-pass/traits/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 // run-pass
  12 // Test calling methods on an impl for a bare trait.
  13
  14 // aux-build:traitimpl.rs
  15
  16 extern crate traitimpl;
  17 use traitimpl::Bar;
  18
  19 static mut COUNT: usize = 1;
  20
  21 trait T {
  22     fn t(&self) {}
  23 }
  24
  25 impl<'a> T+'a {
  26     fn foo(&self) {
  27         unsafe { COUNT *= 2; }
  28     }
  29     fn bar() {
  30         unsafe { COUNT *= 3; }
  31     }
  32 }
  33
  34 impl T for isize {}
  35
  36 struct Foo;
  37 impl<'a> Bar<'a> for Foo {}
  38
  39 fn main() {
  40     let x: &T = &42;
  41
  42     x.foo();
  43     T::foo(x);
  44     T::bar();
  45
  46     unsafe { assert_eq!(COUNT, 12); }
  47
  48     // Cross-crait case
  49     let x: &Bar = &Foo;
  50     x.bar();
  51 }