error: you should not implement `visit_string` without also implementing `visit_str`
  --> $DIR/serde.rs:49:5
   |
49 | /     fn visit_string<E>(self, _v: String) -> Result<Self::Value, E>
50 | |         where E: serde::de::Error,
51 | |     {
52 | |         unimplemented!()
53 | |     }
   | |_____^
   |
   = note: `-D clippy::serde-api-misuse` implied by `-D warnings`

error: aborting due to previous error