error: Creating a reference that is immediately dereferenced.
  --> $DIR/unnecessary_ref.rs:23:17
   |
23 |     let inner = (&outer).inner;
   |                 ^^^^^^^^ help: try this: `outer.inner`
   |
note: lint level defined here
  --> $DIR/unnecessary_ref.rs:20:8
   |
20 | #[deny(clippy::ref_in_deref)]
   |        ^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error