--- /dev/null
+// Copyright 2015 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 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use std::ops::Add;
+fn show(z: i32) {
+ println!("{}", z)
+}
+fn main() {
+ let x = 23;
+ let y = 42;
+ show(Add::add( x, y));
+ show(Add::add( x, &y));
+ show(Add::add(&x, y));
+ show(Add::add(&x, &y));
+ show( x + y);
+ show( x + &y);
+ show(&x + y);
+ show(&x + &y);
+}