|  | error[E0038]: the trait `Bar` is not dyn compatible | 
|  | --> $DIR/mention-correct-dyn-incompatible-trait.rs:19:24 | 
|  | | | 
|  | LL |     let test: &mut dyn Bar = &mut thing; | 
|  | |                        ^^^ `Bar` is not dyn compatible | 
|  | | | 
|  | note: for a trait to be dyn compatible it needs to allow building a vtable | 
|  | for more information, visit <https://doc.rust-lang.org/reference/items/traits.html#dyn-compatibility> | 
|  | --> $DIR/mention-correct-dyn-incompatible-trait.rs:4:8 | 
|  | | | 
|  | LL |     fn foo<T>(&self, val: T); | 
|  | |        ^^^ ...because method `foo` has generic type parameters | 
|  | ... | 
|  | LL | trait Bar: Foo { } | 
|  | |       --- this trait is not dyn compatible... | 
|  | = help: consider moving `foo` to another trait | 
|  | = help: only type `Thing` implements `Bar`; consider using it directly instead. | 
|  |  | 
|  | error: aborting due to 1 previous error | 
|  |  | 
|  | For more information about this error, try `rustc --explain E0038`. |