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+ // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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+ // file at the top-level directory of this distribution and at
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+ // http://rust-lang.org/COPYRIGHT.
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+ //
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+ // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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+ // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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+ // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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+ // option. This file may not be copied, modified, or distributed
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+ // except according to those terms.
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+
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+ use std:: ops:: Add ;
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+ fn show ( z : i32 ) {
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+ println ! ( "{}" , z)
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+ }
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+ fn main ( ) {
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+ let x = 23 ;
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+ let y = 42 ;
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+ show ( Add :: add ( x, y) ) ;
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+ show ( Add :: add ( x, & y) ) ;
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+ show ( Add :: add ( & x, y) ) ;
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+ show ( Add :: add ( & x, & y) ) ;
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+ show ( x + y) ;
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+ show ( x + & y) ;
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+ show ( & x + y) ;
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+ show ( & x + & y) ;
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+ }
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