error: #[serde(flatten)] can not be combined with #[serde(skip_serializing_if = "...")]
 --> $DIR/flatten-skip-serializing-if.rs:6:5
  |
6 | /     #[serde(flatten, skip_serializing_if = "Option::is_none")]
7 | |     other: Option<Other>,
  | |________________________^

error: aborting due to previous error