src/test/compile-fail/object-lifetime-default-mybox.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 "pass-through" object-lifetime-default that produces errors.
  12
  13 #![allow(dead_code)]
  14
  15 trait SomeTrait {
  16     fn dummy(&self) { }
  17 }
  18
  19 struct MyBox<T:?Sized> {
  20     r: Box<T>
  21 }
  22
  23 fn deref<T>(ss: &T) -> T {
  24     // produces the type of a deref without worrying about whether a
  25     // move out would actually be legal
  26     loop { }
  27 }
  28
  29 fn load0(ss: &MyBox<SomeTrait>) -> MyBox<SomeTrait> {
  30     deref(ss)
  31 }
  32
  33 fn load1<'a,'b>(a: &'a MyBox<SomeTrait>,
  34                 b: &'b MyBox<SomeTrait>)
  35                 -> &'b MyBox<SomeTrait>
  36 {
  37     a //~ ERROR E0312
  38 }
  39
  40 fn load2<'a>(ss: &MyBox<SomeTrait+'a>) -> MyBox<SomeTrait+'a> {
  41     load0(ss) //~ ERROR mismatched types
  42 }
  43
  44 fn main() {
  45 }