error: expected identifier, found keyword `Self`
  --> $DIR/self-ctor-133272.rs:17:21
   |
LL |         let S { ref Self } = todo!();
   |                     ^^^^ expected identifier, found keyword

error[E0422]: cannot find struct, variant or union type `S` in this scope
  --> $DIR/self-ctor-133272.rs:17:13
   |
LL |         let S { ref Self } = todo!();
   |             ^ not found in this scope

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0422`.