src/librustc_error_codes/error_codes/E0730.md

   1 An array without a fixed length was pattern-matched.
   2
   3 Example of erroneous code:
   4
   5 ```compile_fail,E0730
   6 #![feature(const_generics)]
   7
   8 fn is_123<const N: usize>(x: [u32; N]) -> bool {
   9     match x {
  10         [1, 2, ..] => true, // error: cannot pattern-match on an
  11                             //        array without a fixed length
  12         _ => false
  13     }
  14 }
  15 ```
  16
  17 Ensure that the pattern is consistent with the size of the matched
  18 array. Additional elements can be matched with `..`:
  19
  20 ```
  21 let r = &[1, 2, 3, 4];
  22 match r {
  23     &[a, b, ..] => { // ok!
  24         println!("a={}, b={}", a, b);
  25     }
  26 }
  27 ```