error[E0380]: auto traits cannot have associated items
  --> $DIR/assoc-ty.rs:10:10
   |
LL | auto trait Trait {
   |            ----- auto traits cannot have associated items
LL |
LL |     type Output;
   |     -----^^^^^^- help: remove these associated items

error[E0658]: auto traits are experimental and possibly buggy
  --> $DIR/assoc-ty.rs:8:1
   |
LL | / auto trait Trait {
LL | |
LL | |     type Output;
LL | |
LL | | }
   | |_^
   |
   = note: see issue #13231 <https://github.com/rust-lang/rust/issues/13231> for more information
   = help: add `#![feature(auto_traits)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

error[E0308]: mismatched types
  --> $DIR/assoc-ty.rs:15:36
   |
LL |     let _: <() as Trait>::Output = ();
   |            ---------------------   ^^ expected associated type, found `()`
   |            |
   |            expected due to this
   |
   = note: expected associated type `<() as Trait>::Output`
                    found unit type `()`
   = help: consider constraining the associated type `<() as Trait>::Output` to `()` or calling a method that returns `<() as Trait>::Output`
   = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0308, E0380, E0658.
For more information about an error, try `rustc --explain E0308`.