// Copyright 2012 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. struct foo(Box); impl Add for foo { fn add(&self, f: &foo) -> foo { let foo(box i) = *self; let foo(box j) = *f; foo(box() (i + j)) } } fn main() { let x = foo(box 3); let _y = x + {x}; // the `{x}` forces a move to occur //~^ ERROR cannot move out of `x` }