error[E0620]: cast to unsized type: `&[usize; 2]` as `[usize]`
  --> $DIR/E0620.rs:2:16
   |
LL |     let _foo = &[1_usize, 2] as [usize];
   |                ^^^^^^^^^^^^^^^^^^^^^^^^
   |
help: consider using an implicit coercion to `&[usize]` instead
  --> $DIR/E0620.rs:2:16
   |
LL |     let _foo = &[1_usize, 2] as [usize];
   |                ^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0620`.