src/test/run-pass/guards-not-exhaustive.rs

   1 // Copyright 2014 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 #![allow(non_snake_case)]
  12
  13 #[derive(Copy, Clone)]
  14 enum Q { R(Option<usize>) }
  15
  16 fn xyzzy(q: Q) -> usize {
  17     match q {
  18         Q::R(S) if S.is_some() => { 0 }
  19         _ => 1
  20     }
  21 }
  22
  23
  24 pub fn main() {
  25     assert_eq!(xyzzy(Q::R(Some(5))), 0);
  26 }