error[E0038]: the trait `Bar` cannot be made into an object --> $DIR/object-safety-generics.rs:20:5 | LL | trait Bar { | --- this trait cannot be made into an object... LL | fn bar(&self, t: T); | --- ...because method `bar` has generic type parameters ... LL | t | ^ the trait `Bar` cannot be made into an object | = help: consider moving `bar` to another trait = note: required because of the requirements on the impl of `std::ops::CoerceUnsized<&dyn Bar>` for `&T` = note: required by cast to type `&dyn Bar` error[E0038]: the trait `Bar` cannot be made into an object --> $DIR/object-safety-generics.rs:26:5 | LL | trait Bar { | --- this trait cannot be made into an object... LL | fn bar(&self, t: T); | --- ...because method `bar` has generic type parameters ... LL | t as &dyn Bar | ^ the trait `Bar` cannot be made into an object | = help: consider moving `bar` to another trait = note: required because of the requirements on the impl of `std::ops::CoerceUnsized<&dyn Bar>` for `&T` = note: required by cast to type `&dyn Bar` error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0038`.