src/test/run-pass/issue-25497.rs

   1 // Copyright 2015 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 #[derive(Clone, Debug, PartialEq)]
  12 enum Expression {
  13     Dummy,
  14     Add(Box<Expression>),
  15 }
  16
  17 use Expression::*;
  18
  19 fn simplify(exp: Expression) -> Expression {
  20     match exp {
  21         Add(n) => *n.clone(),
  22         _ => Dummy
  23     }
  24 }
  25
  26 fn main() {
  27     assert_eq!(simplify(Add(Box::new(Dummy))), Dummy);
  28 }