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`.