error[E0038]: the trait `Eq` cannot be made into an object --> $DIR/object-fail.rs:7:13 | LL | let _: &dyn EqAlias = &123; | ^^^^^^^^^^^ `Eq` 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 --> $SRC_DIR/core/src/cmp.rs:LL:COL | = note: the trait cannot be made into an object because it uses `Self` as a type parameter error[E0191]: the value of the associated type `Item` (from trait `Iterator`) must be specified --> $DIR/object-fail.rs:9:17 | LL | let _: &dyn IteratorAlias = &vec![123].into_iter(); | ^^^^^^^^^^^^^ help: specify the associated type: `IteratorAlias` error: aborting due to 2 previous errors Some errors have detailed explanations: E0038, E0191. For more information about an error, try `rustc --explain E0038`.