src/test/run-pass/by-value-self-in-mut-slot.rs

   1 // Copyright 2013 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.
   4 //
   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.
  10
  11
  12 struct X {
  13     a: isize
  14 }
  15
  16 trait Changer {
  17     fn change(self) -> Self;
  18 }
  19
  20 impl Changer for X {
  21     fn change(mut self) -> X {
  22         self.a = 55;
  23         self
  24     }
  25 }
  26
  27 pub fn main() {
  28     let x = X { a: 32 };
  29     let new_x = x.change();
  30     assert_eq!(new_x.a, 55);
  31 }