src/test/run-pass/arbitrary_self_types_trait.rs

   1 // Copyright 2017 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 #![feature(arbitrary_self_types)]
  11
  12 use std::rc::Rc;
  13
  14 trait Trait {
  15     fn trait_method<'a>(self: &'a Box<Rc<Self>>) -> &'a [i32];
  16 }
  17
  18 impl Trait for Vec<i32> {
  19     fn trait_method<'a>(self: &'a Box<Rc<Self>>) -> &'a [i32] {
  20         &***self
  21     }
  22 }
  23
  24 fn main() {
  25     let v = vec![1,2,3];
  26
  27     assert_eq!(&[1,2,3], Box::new(Rc::new(v)).trait_method());
  28 }