An array or slice pattern required more elements than were present in the
matched array.
Example of erroneous code:
```compile_fail,E0528
#![feature(slice_patterns)]
let r = &[1, 2];
match r {
&[a, b, c, rest @ ..] => { // error: pattern requires at least 3
// elements but array has 2
println!("a={}, b={}, c={} rest={:?}", a, b, c, rest);
}
}
```
Ensure that the matched array has at least as many elements as the pattern
requires. You can match an arbitrary number of remaining elements with `..`:
```
#![feature(slice_patterns)]
let r = &[1, 2, 3, 4, 5];
match r {
&[a, b, c, rest @ ..] => { // ok!
// prints `a=1, b=2, c=3 rest=[4, 5]`
println!("a={}, b={}, c={} rest={:?}", a, b, c, rest);
}
}
```