error[E0038]: the trait `Foo` cannot be made into an object --> $DIR/object-safety-no-static.rs:12:22 | LL | fn diverges() -> Box { | ^^^^^^^ `Foo` cannot be made into an object | note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit --> $DIR/object-safety-no-static.rs:9:8 | LL | trait Foo { | --- this trait cannot be made into an object... LL | fn foo() {} | ^^^ ...because associated function `foo` has no `self` parameter help: consider turning `foo` into a method by giving it a `&self` argument | LL | fn foo(&self) {} | +++++ help: alternatively, consider constraining `foo` so it does not apply to trait objects | LL | fn foo() where Self: Sized {} | +++++++++++++++++ error: aborting due to previous error For more information about this error, try `rustc --explain E0038`.