src/test/compile-fail/issue-35570.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
  11 #![feature(rustc_attrs)]
  12
  13 use std::mem;
  14
  15 trait Trait1<T> {}
  16 trait Trait2<'a> {
  17   type Ty;
  18 }
  19
  20 fn _ice(param: Box<for <'a> Trait1<<() as Trait2<'a>>::Ty>>) {
  21     let _e: (usize, usize) = unsafe{mem::transmute(param)};
  22 }
  23
  24 trait Lifetime<'a> {
  25     type Out;
  26 }
  27 impl<'a> Lifetime<'a> for () {
  28     type Out = &'a ();
  29 }
  30 fn foo<'a>(x: &'a ()) -> <() as Lifetime<'a>>::Out {
  31     x
  32 }
  33
  34 fn takes_lifetime(_f: for<'a> fn(&'a ()) -> <() as Lifetime<'a>>::Out) {
  35 }
  36
  37 #[rustc_error]
  38 fn main() { //~ ERROR compilation successful
  39     takes_lifetime(foo);
  40 }