error: the `Self` constructor can only be used with tuple or unit structs
  --> $DIR/issue-56199.rs:7:17
   |
LL |         let _ = Self;
   |                 ^^^^
   |
   = note: did you mean to use one of the enum's variants?

error: the `Self` constructor can only be used with tuple or unit structs
  --> $DIR/issue-56199.rs:9:17
   |
LL |         let _ = Self();
   |                 ^^^^
   |
   = note: did you mean to use one of the enum's variants?

error: the `Self` constructor can only be used with tuple or unit structs
  --> $DIR/issue-56199.rs:16:17
   |
LL |         let _ = Self;
   |                 ^^^^ did you mean `Self { /* fields */ }`?

error: the `Self` constructor can only be used with tuple or unit structs
  --> $DIR/issue-56199.rs:18:17
   |
LL |         let _ = Self();
   |                 ^^^^ did you mean `Self { /* fields */ }`?

error: aborting due to 4 previous errors