src/test/run-pass/issue-31597.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 trait Make {
  12     type Out;
  13
  14     fn make() -> Self::Out;
  15 }
  16
  17 impl Make for () {
  18     type Out = ();
  19
  20     fn make() -> Self::Out {}
  21 }
  22
  23 // Also make sure we don't hit an ICE when the projection can't be known
  24 fn f<T: Make>() -> <T as Make>::Out { loop {} }
  25
  26 // ...and that it works with a blanket impl
  27 trait Tr {
  28     type Assoc;
  29 }
  30
  31 impl<T: Make> Tr for T {
  32     type Assoc = ();
  33 }
  34
  35 fn g<T: Make>() -> <T as Tr>::Assoc { }
  36
  37 fn main() {}