src/test/compile-fail/variance-associated-types.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 // Test that the variance computation considers types/regions that
  12 // appear in projections to be invariant.
  13
  14 #![feature(rustc_attrs)]
  15
  16 trait Trait<'a> {
  17     type Type;
  18
  19     fn method(&'a self) { }
  20 }
  21
  22 #[rustc_variance]
  23 struct Foo<'a, T : Trait<'a>> { //~ ERROR [-, +]
  24     field: (T, &'a ())
  25 }
  26
  27 #[rustc_variance]
  28 struct Bar<'a, T : Trait<'a>> { //~ ERROR [o, o]
  29     field: <T as Trait<'a>>::Type
  30 }
  31
  32 fn main() { }