src/test/ui/match/match-vec-unreachable.rs

   1 #![feature(slice_patterns)]
   2 #![deny(unreachable_patterns)]
   3
   4 fn main() {
   5     let x: Vec<(isize, isize)> = Vec::new();
   6     let x: &[(isize, isize)] = &x;
   7     match *x {
   8         [a, (2, 3), _] => (),
   9         [(1, 2), (2, 3), b] => (), //~ ERROR unreachable pattern
  10         _ => ()
  11     }
  12
  13     let x: Vec<String> = vec!["foo".to_string(),
  14                               "bar".to_string(),
  15                               "baz".to_string()];
  16     let x: &[String] = &x;
  17     match *x {
  18         [ref a, _, _, ..] => { println!("{}", a); }
  19         [_, _, _, _, _] => { } //~ ERROR unreachable pattern
  20         _ => { }
  21     }
  22
  23     let x: Vec<char> = vec!['a', 'b', 'c'];
  24     let x: &[char] = &x;
  25     match *x {
  26         ['a', 'b', 'c', ref _tail @ ..] => {}
  27         ['a', 'b', 'c'] => {} //~ ERROR unreachable pattern
  28         _ => {}
  29     }
  30 }