src/test/ui/issues/issue-35376.rs

   1 // Copyright 2016 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 // compile-pass
  12 #![feature(specialization)]
  13
  14 fn main() {}
  15
  16 pub trait Alpha<T> { }
  17
  18 pub trait Beta {
  19     type Event;
  20 }
  21
  22 pub trait Delta {
  23     type Handle;
  24     fn process(&self);
  25 }
  26
  27 pub struct Parent<A, T>(A, T);
  28
  29 impl<A, T> Delta for Parent<A, T>
  30 where A: Alpha<T::Handle>,
  31       T: Delta,
  32       T::Handle: Beta<Event = <Handle as Beta>::Event> {
  33     type Handle = Handle;
  34     default fn process(&self) {
  35         unimplemented!()
  36     }
  37 }
  38
  39 impl<A, T> Delta for Parent<A, T>
  40 where A: Alpha<T::Handle> + Alpha<Handle>,
  41       T: Delta,
  42       T::Handle: Beta<Event = <Handle as Beta>::Event> {
  43       fn process(&self) {
  44         unimplemented!()
  45       }
  46 }
  47
  48 pub struct Handle;
  49
  50 impl Beta for Handle {
  51     type Event = ();
  52 }