src/test/run-pass/vec-tail-matching.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
  12
  13 #![feature(slice_patterns)]
  14
  15 struct Foo {
  16     string: String
  17 }
  18
  19 pub fn main() {
  20     let x = [
  21         Foo { string: "foo".to_string() },
  22         Foo { string: "bar".to_string() },
  23         Foo { string: "baz".to_string() }
  24     ];
  25     match x {
  26         [ref first, tail..] => {
  27             assert_eq!(first.string, "foo".to_string());
  28             assert_eq!(tail.len(), 2);
  29             assert_eq!(tail[0].string, "bar".to_string());
  30             assert_eq!(tail[1].string, "baz".to_string());
  31
  32             match tail {
  33                 [Foo { .. }, _, Foo { .. }, _tail..] => {
  34                     unreachable!();
  35                 }
  36                 [Foo { string: ref a }, Foo { string: ref b }] => {
  37                     assert_eq!("bar", &a[0..a.len()]);
  38                     assert_eq!("baz", &b[0..b.len()]);
  39                 }
  40                 _ => {
  41                     unreachable!();
  42                 }
  43             }
  44         }
  45     }
  46 }