error[E0038]: the trait `Clone` cannot be made into an object
  --> $DIR/issue-116434-2021.rs:5:17
   |
LL |     fn foo() -> Clone;
   |                 ^^^^^ `Clone` cannot be made into an object
   |
   = note: the trait cannot be made into an object because it requires `Self: Sized`
   = note: for a trait to be "dyn-compatible" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
help: there is an associated type with the same name
   |
LL |     fn foo() -> Self::Clone;
   |                 ++++++

error[E0038]: the trait `DbHandle` cannot be made into an object
  --> $DIR/issue-116434-2021.rs:14:20
   |
LL |     fn handle() -> DbHandle;
   |                    ^^^^^^^^ `DbHandle` cannot be made into an object
   |
note: for a trait to be "dyn-compatible" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
  --> $DIR/issue-116434-2021.rs:10:17
   |
LL | trait DbHandle: Sized {}
   |       --------  ^^^^^ ...because it requires `Self: Sized`
   |       |
   |       this trait cannot be made into an object...
help: there is an associated type with the same name
   |
LL |     fn handle() -> Self::DbHandle;
   |                    ++++++

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0038`.