src/test/run-pass/dst-coerce-rc.rs

   1 // Copyright 2015 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 a very simple custom DST coercion.
  12
  13 #![feature(core)]
  14
  15 use std::cell::RefCell;
  16 use std::rc::Rc;
  17
  18 trait Baz {
  19     fn get(&self) -> i32;
  20 }
  21
  22 impl Baz for i32 {
  23     fn get(&self) -> i32 {
  24         *self
  25     }
  26 }
  27
  28 fn main() {
  29     let a: Rc<[i32; 3]> = Rc::new([1, 2, 3]);
  30     let b: Rc<[i32]> = a;
  31     assert_eq!(b[0], 1);
  32     assert_eq!(b[1], 2);
  33     assert_eq!(b[2], 3);
  34
  35     let a: Rc<i32> = Rc::new(42);
  36     let b: Rc<Baz> = a.clone();
  37     assert_eq!(b.get(), 42);
  38
  39     let _c = b.clone();
  40
  41     let a: Rc<RefCell<i32>> = Rc::new(RefCell::new(42));
  42     let b: Rc<RefCell<Baz>> = a.clone();
  43     assert_eq!(b.borrow().get(), 42);
  44 }