|  | error[E0307]: invalid `self` parameter type: `Cell<&Self>` | 
|  | --> $DIR/feature-gate-dispatch-from-dyn-cell.rs:6:19 | 
|  | | | 
|  | LL |     fn cell(self: Cell<&Self>); | 
|  | |                   ^^^^^^^^^^^ | 
|  | | | 
|  | = note: type of `self` must be `Self` or a type that dereferences to it | 
|  | = help: consider changing to `self`, `&self`, `&mut self`, `self: Box<Self>`, `self: Rc<Self>`, `self: Arc<Self>`, or `self: Pin<P>` (where P is one of the previous types except `Self`) | 
|  |  | 
|  | error: aborting due to 1 previous error | 
|  |  | 
|  | For more information about this error, try `rustc --explain E0307`. |