// Copyright 2014 The Rust Project Developers. See the COPYRIGHT // file at the top-level directory of this distribution and at // http://rust-lang.org/COPYRIGHT. // // Licensed under the Apache License, Version 2.0 or the MIT license // , at your // option. This file may not be copied, modified, or distributed // except according to those terms. pub trait Handler { fn handle(&self, _: &mut String); } impl Handler for F where F: for<'a, 'b> Fn(&'a mut String) { fn handle(&self, st: &mut String) { self(st) } } fn main() {}