warning: trait objects without an explicit `dyn` are deprecated
  --> $DIR/issue-116434-2015.rs:5:17
   |
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/edition-guide/rust-2021/warnings-promoted-to-error.html>
   = note: `#[warn(bare_trait_objects)]` (part of `#[warn(rust_2021_compatibility)]`) 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:5:17
   |
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/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` is not dyn compatible
  --> $DIR/issue-116434-2015.rs:5:17
   |
LL |     fn foo() -> Clone;
   |                 ^^^^^ `Clone` is not dyn compatible
   |
   = note: the trait is not dyn compatible because it requires `Self: Sized`
   = note: for a trait to be dyn compatible it needs to allow building a vtable
           for more information, visit <https://doc.rust-lang.org/reference/items/traits.html#dyn-compatibility>
help: you might have meant to use `Self` to refer to the implementing type
   |
LL -     fn foo() -> Clone;
LL +     fn foo() -> Self;
   |
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:21:20
   |
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/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:21:20
   |
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/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` is not dyn compatible
  --> $DIR/issue-116434-2015.rs:21:20
   |
LL |     fn handle() -> DbHandle;
   |                    ^^^^^^^^ `DbHandle` is not dyn compatible
   |
note: for a trait to be dyn compatible it needs to allow building a vtable
      for more information, visit <https://doc.rust-lang.org/reference/items/traits.html#dyn-compatibility>
  --> $DIR/issue-116434-2015.rs:17:17
   |
LL | trait DbHandle: Sized {}
   |       --------  ^^^^^ ...because it requires `Self: Sized`
   |       |
   |       this trait is not dyn compatible...
help: you might have meant to use `Self` to refer to the implementing type
   |
LL -     fn handle() -> DbHandle;
LL +     fn handle() -> Self;
   |
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`.