error[E0404]: expected trait, found struct `Struct`
  --> $DIR/suggest-swapping-self-ty-and-trait-edition-2021.rs:12:13
   |
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-edition-2021.rs:16:13
   |
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-edition-2021.rs:19:13
   |
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[E0782]: trait objects must include the `dyn` keyword
  --> $DIR/suggest-swapping-self-ty-and-trait-edition-2021.rs:12:27
   |
LL | impl<'a, T> Struct<T> for Trait<'a, T> {}
   |                           ^^^^^^^^^^^^
   |
help: add `dyn` keyword before this trait
   |
LL | impl<'a, T> Struct<T> for dyn Trait<'a, T> {}
   |                           +++

error: aborting due to 4 previous errors

Some errors have detailed explanations: E0404, E0782.
For more information about an error, try `rustc --explain E0404`.