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

   1 // Copyright 2013 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 #![feature(box_syntax)]
  12
  13 use std::io::{self, Write};
  14
  15 trait Trait {
  16     fn f(&self);
  17 }
  18
  19 #[derive(Copy, Clone)]
  20 struct Struct {
  21     x: isize,
  22     y: isize,
  23 }
  24
  25 impl Trait for Struct {
  26     fn f(&self) {
  27         println!("Hi!");
  28     }
  29 }
  30
  31 fn foo(mut a: Box<Write>) {}
  32
  33 pub fn main() {
  34     let a = Struct { x: 1, y: 2 };
  35     let b: Box<Trait> = Box::new(a);
  36     b.f();
  37     let c: &Trait = &a;
  38     c.f();
  39
  40     let out = io::stdout();
  41     foo(Box::new(out));
  42 }