src/test/compile-fail/specialization/specialization-polarity.rs

   1 // Copyright 2015 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 // Make sure specialization cannot change impl polarity
  12
  13 #![feature(optin_builtin_traits)]
  14 #![feature(specialization)]
  15
  16 trait Foo {}
  17
  18 impl Foo for .. {}
  19
  20 impl<T> Foo for T {}
  21 impl !Foo for u8 {} //~ ERROR E0119
  22
  23 trait Bar {}
  24
  25 impl Bar for .. {}
  26
  27 impl<T> !Bar for T {}
  28 impl Bar for u8 {} //~ ERROR E0119
  29
  30 fn main() {}