error: #[derive(Label)] needs to have 1 field marked with #[label]
 --> tests/ui/entity_label_multiple_labels.rs:4:13
  |
4 |   struct Test {
  |  _____________^
5 | |     id: Key<Int>,
6 | |     #[label] data1: String,
7 | |     #[label] data2: String,
8 | | }
  | |_^