error: Creating a reference that is immediately dereferenced.
  --> $DIR/unnecessary_ref.rs:11:17
   |
11 |     let inner = (&outer).inner;
   |                 ^^^^^^^^ help: try this: `outer.inner`
   |
note: lint level defined here
  --> $DIR/unnecessary_ref.rs:8:8
   |
8  | #[deny(ref_in_deref)]
   |        ^^^^^^^^^^^^

error: aborting due to previous error