error[E0005]: refutable pattern in `for` loop binding
  --> $DIR/issue-15381.rs:4:9
   |
LL |     for &[x,y,z] in values.chunks(3).filter(|&xs| xs.len() == 3) {
   |         ^^^^^^^^ patterns `&[]`, `&[_]`, `&[_, _]` and 1 more not covered
   |
   = note: the matched value is of type `&[u8]`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0005`.