error: `A` has no fields, `..` needs at least one default field in the struct definition
  --> $DIR/empty-struct.rs:16:17
   |
LL |     let _ = A { .. };
   |             -   ^^
   |             |
   |             this type has no fields

error: `B` has no fields, `..` needs at least one default field in the struct definition
  --> $DIR/empty-struct.rs:17:17
   |
LL |     let _ = B { .. };
   |             -   ^^
   |             |
   |             this type has no fields

error: `C` has no fields, `..` needs at least one default field in the struct definition
  --> $DIR/empty-struct.rs:18:17
   |
LL |     let _ = C { .. };
   |             -   ^^
   |             |
   |             this type has no fields

error: aborting due to 3 previous errors