error[E0038]: the trait `std::cmp::Eq` cannot be made into an object
  --> $DIR/trait-alias-object-fail.rs:7:13
   |
LL |     let _: &dyn EqAlias = &123;
   |             ^^^^^^^^^^^ the trait `std::cmp::Eq` cannot be made into an object
   | 
  ::: $SRC_DIR/core/src/cmp.rs:LL:COL
   |
LL | pub trait Eq: PartialEq<Self> {
   |               --------------- the trait cannot be made into an object because it uses `Self` as a type parameter in this

error[E0191]: the value of the associated type `Item` (from trait `std::iter::Iterator`) must be specified
  --> $DIR/trait-alias-object-fail.rs:9:17
   |
LL |     let _: &dyn IteratorAlias = &vec![123].into_iter();
   |                 ^^^^^^^^^^^^^ help: specify the associated type: `IteratorAlias<Item = Type>`

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0038, E0191.
For more information about an error, try `rustc --explain E0038`.