src/test/compile-fail/issue-29861.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 pub trait MakeRef<'a> {
  12     type Ref;
  13 }
  14 impl<'a, T: 'a> MakeRef<'a> for T {
  15     type Ref = &'a T;
  16 }
  17
  18 pub trait MakeRef2 {
  19     type Ref2;
  20 }
  21 impl<'a, T: 'a> MakeRef2 for T {
  22 //~^ ERROR the lifetime parameter `'a` is not constrained
  23     type Ref2 = <T as MakeRef<'a>>::Ref;
  24 }
  25
  26 fn foo() -> <String as MakeRef2>::Ref2 { &String::from("foo") }
  27
  28 fn main() {
  29     println!("{}", foo());
  30 }