error[E0038]: the trait `Bar` is not dyn compatible --> $DIR/generics.rs:15:31 | LL | fn make_bar(t: &T) -> &dyn Bar { | ^^^^^^^ `Bar` is not dyn compatible | note: for a trait to be dyn compatible it needs to allow building a vtable for more information, visit --> $DIR/generics.rs:7:8 | LL | trait Bar { | --- this trait is not dyn compatible... LL | fn bar(&self, t: T); | ^^^ ...because method `bar` has generic type parameters = help: consider moving `bar` to another trait error[E0038]: the trait `Bar` is not dyn compatible --> $DIR/generics.rs:21:40 | LL | fn make_bar_explicit(t: &T) -> &dyn Bar { | ^^^^^^^ `Bar` is not dyn compatible | note: for a trait to be dyn compatible it needs to allow building a vtable for more information, visit --> $DIR/generics.rs:7:8 | LL | trait Bar { | --- this trait is not dyn compatible... LL | fn bar(&self, t: T); | ^^^ ...because method `bar` has generic type parameters = help: consider moving `bar` to another trait error[E0038]: the trait `Bar` is not dyn compatible --> $DIR/generics.rs:17:5 | LL | t | ^ `Bar` is not dyn compatible | note: for a trait to be dyn compatible it needs to allow building a vtable for more information, visit --> $DIR/generics.rs:7:8 | LL | trait Bar { | --- this trait is not dyn compatible... LL | fn bar(&self, t: T); | ^^^ ...because method `bar` has generic type parameters = help: consider moving `bar` to another trait = note: required for the cast from `&T` to `&dyn Bar` error[E0038]: the trait `Bar` is not dyn compatible --> $DIR/generics.rs:23:10 | LL | t as &dyn Bar | ^^^^^^^^ `Bar` is not dyn compatible | note: for a trait to be dyn compatible it needs to allow building a vtable for more information, visit --> $DIR/generics.rs:7:8 | LL | trait Bar { | --- this trait is not dyn compatible... LL | fn bar(&self, t: T); | ^^^ ...because method `bar` has generic type parameters = help: consider moving `bar` to another trait error[E0038]: the trait `Bar` is not dyn compatible --> $DIR/generics.rs:23:5 | LL | t as &dyn Bar | ^ `Bar` is not dyn compatible | note: for a trait to be dyn compatible it needs to allow building a vtable for more information, visit --> $DIR/generics.rs:7:8 | LL | trait Bar { | --- this trait is not dyn compatible... LL | fn bar(&self, t: T); | ^^^ ...because method `bar` has generic type parameters = help: consider moving `bar` to another trait = note: required for the cast from `&T` to `&dyn Bar` error: aborting due to 5 previous errors For more information about this error, try `rustc --explain E0038`.