error[E0658]: non-reference pattern used to match a reference (see issue #42640)
  --> $DIR/pat-slice-old-style.rs:19:9
   |
LL |         [a, b..] => {},
   |         ^^^^^^^^ help: consider using a reference: `&[a, b..]`
   |
   = help: add #![feature(match_default_bindings)] to the crate attributes to enable

error: aborting due to previous error

If you want more information on this error, try using "rustc --explain E0658"