src/test/ui/issues/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 // compile-pass
  12 #![allow(dead_code)]
  13 trait Make {
  14     type Out;
  15
  16     fn make() -> Self::Out;
  17 }
  18
  19 impl Make for () {
  20     type Out = ();
  21
  22     fn make() -> Self::Out {}
  23 }
  24
  25 // Also make sure we don't hit an ICE when the projection can't be known
  26 fn f<T: Make>() -> <T as Make>::Out { loop {} }
  27
  28 // ...and that it works with a blanket impl
  29 trait Tr {
  30     type Assoc;
  31 }
  32
  33 impl<T: Make> Tr for T {
  34     type Assoc = ();
  35 }
  36
  37 fn g<T: Make>() -> <T as Tr>::Assoc { }
  38
  39 fn main() {}