src/test/compile-fail/issue-39970.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 trait Array<'a> {
  12     type Element: 'a;
  13 }
  14
  15 trait Visit {
  16     fn visit() {}
  17 }
  18
  19 impl<'a> Array<'a> for () {
  20     type Element = &'a ();
  21 }
  22
  23 impl Visit for () where
  24     //(): for<'a> Array<'a, Element=&'a ()>, // No ICE
  25     (): for<'a> Array<'a, Element=()>, // ICE
  26 {}
  27
  28 fn main() {
  29     <() as Visit>::visit();
  30     //~^ ERROR type mismatch resolving `for<'a> <() as Array<'a>>::Element == ()`
  31 }