error[E0508]: cannot move out of type `[Foo]`, a non-copy slice
  --> $DIR/borrowck-move-out-of-vec-tail.rs:30:18
   |
LL |                   &[Foo { string: a },
   |                    ^              - hint: to prevent move, use `ref a` or `ref mut a`
   |  __________________|
   | |
LL | |                 //~^ ERROR cannot move out of type `[Foo]`
LL | |                 //~| cannot move out
LL | |                 //~| to prevent move
LL | |                   Foo { string: b }] => {
   | |_________________________________-__^ cannot move out of here
   |                                   |
   |                                   ...and here (use `ref b` or `ref mut b`)

error: aborting due to previous error

If you want more information on this error, try using "rustc --explain E0508"