1 error[E0594]: cannot assign to `fancy_ref.num`, which is behind a `&` reference
4 LL | let fancy_ref = &(&mut fancy);
5 | ------------- help: consider changing this to be a mutable reference: `&mut (&mut fancy)`
6 LL | fancy_ref.num = 6;
7 | ^^^^^^^^^^^^^^^^^ `fancy_ref` is a `&` reference, so the data it refers to cannot be written
9 error: aborting due to previous error
11 For more information about this error, try `rustc --explain E0594`.