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.
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.
11 #![feature(unboxed_closures)]
13 // A basic test of using a higher-ranked trait bound.
16 fn call(&self, arg: A) -> R;
19 type FnObject<'b> = for<'a> FnLike<(&'a i32,), &'a i32> + 'b;
23 impl<'a, T> FnLike<(&'a T,), &'a T> for Identity {
24 fn call(&self, (arg,): (&'a T,)) -> &'a T {
29 fn call_repeatedly(f: &FnObject) {
31 let y = f.call((&x,));
36 call_repeatedly(&Identity);