error[E0038]: the trait `Qiz` cannot be made into an object --> $DIR/issue-19380.rs:11:29 | LL | foos: &'static [&'static (dyn Qiz + 'static)] | ^^^^^^^^^^^^^^^^^ `Qiz` 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/issue-19380.rs:2:6 | LL | trait Qiz { | --- this trait cannot be made into an object... LL | fn qiz(); | ^^^ ...because associated function `qiz` has no `self` parameter = help: only type `Foo` implements the trait, consider using it directly instead help: consider turning `qiz` into a method by giving it a `&self` argument | LL | fn qiz(&self); | +++++ help: alternatively, consider constraining `qiz` so it does not apply to trait objects | LL | fn qiz() where Self: Sized; | +++++++++++++++++ error[E0038]: the trait `Qiz` cannot be made into an object --> $DIR/issue-19380.rs:16:33 | LL | const BAR : Bar = Bar { foos: &[&FOO]}; | ^^^^ `Qiz` 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/issue-19380.rs:2:6 | LL | trait Qiz { | --- this trait cannot be made into an object... LL | fn qiz(); | ^^^ ...because associated function `qiz` has no `self` parameter = help: only type `Foo` implements the trait, consider using it directly instead = note: required for the cast from `&Foo` to `&'static (dyn Qiz + 'static)` help: consider turning `qiz` into a method by giving it a `&self` argument | LL | fn qiz(&self); | +++++ help: alternatively, consider constraining `qiz` so it does not apply to trait objects | LL | fn qiz() where Self: Sized; | +++++++++++++++++ error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0038`.