src/test/run-pass/issue-7784.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 #![feature(advanced_slice_patterns)]
  13 #![feature(slice_patterns)]
  14
  15 use std::ops::Add;
  16
  17 fn foo<T: Add<Output=T> + Clone>([x, y, z]: [T; 3]) -> (T, T, T) {
  18     (x.clone(), x.clone() + y.clone(), x + y + z)
  19 }
  20 fn bar(a: &'static str, b: &'static str) -> [&'static str; 4] {
  21     [a, b, b, a]
  22 }
  23
  24 fn main() {
  25     assert_eq!(foo([1, 2, 3]), (1, 3, 6));
  26
  27     let [a, b, c, d] = bar("foo", "bar");
  28     assert_eq!(a, "foo");
  29     assert_eq!(b, "bar");
  30     assert_eq!(c, "bar");
  31     assert_eq!(d, "foo");
  32
  33     let [a, _, _, d] = bar("baz", "foo");
  34     assert_eq!(a, "baz");
  35     assert_eq!(d, "baz");
  36
  37     let out = bar("baz", "foo");
  38     let [a, xs.., d] = out;
  39     assert_eq!(a, "baz");
  40     assert_eq!(xs, ["foo", "foo"]);
  41     assert_eq!(d, "baz");
  42 }