error[E0423]: expected value, found struct `S`
  --> $DIR/self-span.rs:18:23
   |
3  | pub struct S {}
   | --------------- `S` defined here
...
18 |         let _: Self = Self;
   |                       ^^^^ did you mean `S { /* fields */ }`?

error[E0308]: mismatched types
  --> $DIR/self-span.rs:17:21
   |
17 |         let _: () = self;
   |                --   ^^^^ expected `()`, found struct `S`
   |                |
   |                expected due to this

error[E0308]: mismatched types
  --> $DIR/self-span.rs:25:21
   |
25 |         let _: () = self;
   |                --   ^^^^ expected `()`, found enum `E`
   |                |
   |                expected due to this

error[E0533]: expected unit struct, unit variant or constant, found struct variant `Self::V`
  --> $DIR/self-span.rs:26:23
   |
26 |         let _: Self = Self::V;
   |                       ^^^^^^^