warning: trait objects without an explicit `dyn` are deprecated
  --> $DIR/issue-116434-2015.rs:3:17
   |
LL |     fn foo() -> Clone;
   |                 ^^^^^
   |
   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
   = note: `#[warn(bare_trait_objects)]` on by default
help: if this is a dyn-compatible trait, use `dyn`
   |
LL |     fn foo() -> dyn Clone;
   |                 +++

warning: trait objects without an explicit `dyn` are deprecated
  --> $DIR/issue-116434-2015.rs:18:20
   |
LL |     fn handle() -> DbHandle;
   |                    ^^^^^^^^
   |
   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
help: if this is a dyn-compatible trait, use `dyn`
   |
LL |     fn handle() -> dyn DbHandle;
   |                    +++

warning: trait objects without an explicit `dyn` are deprecated
  --> $DIR/issue-116434-2015.rs:3:17
   |
LL |     fn foo() -> Clone;
   |                 ^^^^^
   |
   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
help: if this is a dyn-compatible trait, use `dyn`
   |
LL |     fn foo() -> dyn Clone;
   |                 +++

error[E0038]: the trait `Clone` cannot be made into an object
  --> $DIR/issue-116434-2015.rs:3:17
   |
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;
   |                 ++++++

warning: trait objects without an explicit `dyn` are deprecated
  --> $DIR/issue-116434-2015.rs:18:20
   |
LL |     fn handle() -> DbHandle;
   |                    ^^^^^^^^
   |
   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
help: if this is a dyn-compatible trait, use `dyn`
   |
LL |     fn handle() -> dyn DbHandle;
   |                    +++

error[E0038]: the trait `DbHandle` cannot be made into an object
  --> $DIR/issue-116434-2015.rs:18:20
   |
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-116434-2015.rs:14:17
   |
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; 4 warnings emitted

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