error[E0596]: cannot borrow `x[..]` as mutable, as `x` is not declared as mutable
  --> $DIR/array_subslice.rs:7:21
   |
LL |         let [ref y, ref mut z @ ..] = x;
   |                     ^^^^^^^^^ cannot borrow as mutable
   |
help: consider changing this to be mutable
   |
LL | pub fn subslice_array(mut x: [u8; 3]) {
   |                       +++

error[E0596]: cannot borrow `f` as mutable, as it is not declared as mutable
  --> $DIR/array_subslice.rs:10:5
   |
LL |         let [ref y, ref mut z @ ..] = x;
   |                                       - calling `f` requires mutable binding due to mutable borrow of `x`
...
LL |     f();
   |     ^ cannot borrow as mutable
   |
help: consider changing this to be mutable
   |
LL |     let mut f = || {
   |         +++

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0596`.