error: variant `Tuple` cannot have both #[serde(serialize_with)] and a field #0 marked with #[serde(skip_serializing)] --> $DIR/skip_ser_tuple_field.rs:5:5 | 5 | / #[serde(serialize_with = "serialize_some_other_variant")] 6 | | Tuple(#[serde(skip_serializing)] String, u8), | |________________________________________________^