1 error[E0599]: no method named `deref` found for reference `&()` in the current scope
2 --> $DIR/shadow.rs:19:11
5 | ^^^^^ method not found in `&()`
7 = help: items from traits can only be used if the trait is in scope
8 = note: the following trait is implemented but not in scope; perhaps add a `use` for it:
11 error: aborting due to previous error
13 For more information about this error, try `rustc --explain E0599`.