error: #[serde(transparent)] requires at least one field that is not skipped
 --> $DIR/ser_at_least_one.rs:5:1
  |
5 | / #[serde(transparent)]
6 | | struct S {
7 | |     #[serde(skip)]
8 | |     a: u8,
9 | | }
  | |_^

error: aborting due to previous error