error: variant `Tuple` cannot have both #[serde(serialize_with)] and a field #0 marked with #[serde(skip_serializing)]
 --> tests/ui/with-variant/skip_ser_tuple_field.rs:5:5
  |
3 |   #[derive(Serialize)]
  |            --------- in this derive macro expansion
4 |   enum Enum {
5 | /     #[serde(serialize_with = "serialize_some_other_variant")]
6 | |     Tuple(#[serde(skip_serializing)] String, u8),
  | |________________________________________________^
  |
  = note: this error originates in the derive macro `Serialize` (in Nightly builds, run with -Z macro-backtrace for more info)