src/test/compile-fail/where-clause-constraints-are-local-for-trait-impl.rs

   1 // Copyright 2014 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 fn require_copy<T: Copy>(x: T) {}
  12
  13 struct Bar<T> { x: T }
  14
  15 trait Foo<T> {
  16     fn needs_copy(self) where T: Copy;
  17     fn fails_copy(self);
  18 }
  19
  20 // Ensure constraints are only attached to methods locally
  21 impl<T> Foo<T> for Bar<T> {
  22     fn needs_copy(self) where T: Copy {
  23         require_copy(self.x);
  24
  25     }
  26
  27     fn fails_copy(self) {
  28         require_copy(self.x);
  29         //~^ ERROR the trait bound `T: std::marker::Copy` is not satisfied
  30     }
  31 }
  32
  33 fn main() {}