rust/tests/ui/destructuring-assignment/slice_destructure_fail.rs

fn main() {
  let (mut a, mut b);
  [a, .., b, ..] = [0, 1]; //~ ERROR `..` can only be used once per slice pattern
  [a, a, b] = [1, 2]; //~ ERROR pattern requires 3 elements but array has 2
  [_] = [1, 2]; //~ ERROR pattern requires 1 element but array has 2
}