error: creating a reference that is immediately dereferenced
  --> $DIR/unnecessary_ref.rs:13:17
   |
LL |     let inner = (&outer).inner;
   |                 ^^^^^^^^ help: try this: `outer`
   |
note: the lint level is defined here
  --> $DIR/unnecessary_ref.rs:10:8
   |
LL | #[deny(clippy::ref_in_deref)]
   |        ^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

