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