src/test/run-pass/issue-29037.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 // This test ensures that each pointer type `P<X>` is covariant in `X`.
  12
  13 use std::rc::Rc;
  14 use std::sync::Arc;
  15
  16 fn a<'r>(x: Box<&'static str>) -> Box<&'r str> {
  17     x
  18 }
  19
  20 fn b<'r, 'w>(x: &'w &'static str) -> &'w &'r str {
  21     x
  22 }
  23
  24 fn c<'r>(x: Arc<&'static str>) -> Arc<&'r str> {
  25     x
  26 }
  27
  28 fn d<'r>(x: Rc<&'static str>) -> Rc<&'r str> {
  29     x
  30 }
  31
  32 fn main() {}