error[E0404]: expected trait, found struct `Struct`
  --> $DIR/suggest-swapping-self-ty-and-trait.rs:13:13
   |
LL | impl<'a, T> Struct<T> for Trait<'a, T> {}
   |             ^^^^^^^^^ not a trait
   |
help: `impl` items mention the trait being implemented first and the type it is being implemented for second
   |
LL | impl<'a, T> Trait<'a, T> for Struct<T> {}
   |             ~~~~~~~~~~~~     ~~~~~~~~~

error[E0404]: expected trait, found enum `Enum`
  --> $DIR/suggest-swapping-self-ty-and-trait.rs:18:13
   |
LL | impl<'a, T> Enum<T> for Trait<'a, T> {}
   |             ^^^^^^^ not a trait
   |
help: `impl` items mention the trait being implemented first and the type it is being implemented for second
   |
LL | impl<'a, T> Trait<'a, T> for Enum<T> {}
   |             ~~~~~~~~~~~~     ~~~~~~~

error[E0404]: expected trait, found union `Union`
  --> $DIR/suggest-swapping-self-ty-and-trait.rs:23:13
   |
LL | impl<'a, T> Union<T> for Trait<'a, T> {}
   |             ^^^^^^^^ not a trait
   |
help: `impl` items mention the trait being implemented first and the type it is being implemented for second
   |
LL | impl<'a, T> Trait<'a, T> for Union<T> {}
   |             ~~~~~~~~~~~~     ~~~~~~~~

error[E0392]: type parameter `T` is never used
  --> $DIR/suggest-swapping-self-ty-and-trait.rs:3:19
   |
LL | pub struct Struct<T>;
   |                   ^ unused type parameter
   |
   = help: consider removing `T`, referring to it in a field, or using a marker such as `PhantomData`
   = help: if you intended `T` to be a const parameter, use `const T: /* Type */` instead

error[E0392]: type parameter `T` is never used
  --> $DIR/suggest-swapping-self-ty-and-trait.rs:5:15
   |
LL | pub enum Enum<T> {}
   |               ^ unused type parameter
   |
   = help: consider removing `T`, referring to it in a field, or using a marker such as `PhantomData`
   = help: if you intended `T` to be a const parameter, use `const T: /* Type */` instead

error[E0392]: type parameter `T` is never used
  --> $DIR/suggest-swapping-self-ty-and-trait.rs:8:17
   |
LL | pub union Union<T> {
   |                 ^ unused type parameter
   |
   = help: consider removing `T`, referring to it in a field, or using a marker such as `PhantomData`
   = help: if you intended `T` to be a const parameter, use `const T: /* Type */` instead

warning: trait objects without an explicit `dyn` are deprecated
  --> $DIR/suggest-swapping-self-ty-and-trait.rs:13:27
   |
LL | impl<'a, T> Struct<T> for Trait<'a, T> {}
   |                           ^^^^^^^^^^^^
   |
   = 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 an object-safe trait, use `dyn`
   |
LL | impl<'a, T> Struct<T> for dyn Trait<'a, T> {}
   |                           +++

warning: trait objects without an explicit `dyn` are deprecated
  --> $DIR/suggest-swapping-self-ty-and-trait.rs:18:25
   |
LL | impl<'a, T> Enum<T> for Trait<'a, T> {}
   |                         ^^^^^^^^^^^^
   |
   = 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 an object-safe trait, use `dyn`
   |
LL | impl<'a, T> Enum<T> for dyn Trait<'a, T> {}
   |                         +++

warning: trait objects without an explicit `dyn` are deprecated
  --> $DIR/suggest-swapping-self-ty-and-trait.rs:23:26
   |
LL | impl<'a, T> Union<T> for Trait<'a, T> {}
   |                          ^^^^^^^^^^^^
   |
   = 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 an object-safe trait, use `dyn`
   |
LL | impl<'a, T> Union<T> for dyn Trait<'a, T> {}
   |                          +++

error: aborting due to 6 previous errors; 3 warnings emitted

Some errors have detailed explanations: E0392, E0404.
For more information about an error, try `rustc --explain E0392`.