error[E0508]: cannot move out of type `[A]`, a non-copy slice
  --> $DIR/move-out-of-slice-1.rs:7:11
   |
LL |     match a {
   |           ^ cannot move out of here
LL |         box [a] => {},
   |              -
   |              |
   |              data moved here
   |              move occurs because `a` has type `A`, which does not implement the `Copy` trait
   |
help: consider borrowing the pattern binding
   |
LL |         box [ref a] => {},
   |              +++

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0508`.