error[E0308]: mismatched types
  --> $DIR/return-impl-trait.rs:15:5
   |
LL | fn bar<T: Trait + std::marker::Sync>() -> T
   |        -                                  -
   |        |                                  |
   |        |                                  expected `T` because of return type
   |        this type parameter                help: consider using an impl return type: `impl Trait + std::marker::Sync + Send`
...
LL |     ()
   |     ^^ expected type parameter `T`, found `()`
   |
   = note: expected type parameter `T`
                   found unit type `()`

error[E0308]: mismatched types
  --> $DIR/return-impl-trait.rs:23:5
   |
LL | fn other_bounds<T>() -> T
   |                 -       -
   |                 |       |
   |                 |       expected `T` because of return type
   |                 |       help: consider using an impl return type: `impl Trait`
   |                 this type parameter
...
LL |     ()
   |     ^^ expected type parameter `T`, found `()`
   |
   = note: expected type parameter `T`
                   found unit type `()`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0308`.