src/test/run-pass/auto-traits.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(optin_builtin_traits)]
  12
  13 auto trait Auto {}
  14 // Redundant but accepted until we remove it.
  15 #[allow(auto_impl)]
  16 impl Auto for .. {}
  17
  18 unsafe auto trait AutoUnsafe {}
  19
  20 impl !Auto for bool {}
  21 impl !AutoUnsafe for bool {}
  22
  23 struct AutoBool(bool);
  24
  25 impl Auto for AutoBool {}
  26 unsafe impl AutoUnsafe for AutoBool {}
  27
  28 fn take_auto<T: Auto>(_: T) {}
  29 fn take_auto_unsafe<T: AutoUnsafe>(_: T) {}
  30
  31 fn main() {
  32     take_auto(0);
  33     take_auto(AutoBool(true));
  34     take_auto_unsafe(0);
  35     take_auto_unsafe(AutoBool(true));
  36
  37     /// Auto traits are allowed in trait object bounds.
  38     let _: &(Send + Auto) = &0;
  39 }