import org.mapstruct.Mapper;

/** MapStruct can map String to String and Tag to Tag-like beans, but not a Tag to a String. */
@Mapper
public interface BrokenMapper {

    class Tag {
        private final String label;
        public Tag(String label) { this.label = label; }
        public String getLabel() { return label; }
    }

    record Src(Tag tag) { }

    record Dst(java.time.LocalDate tag) { }

    Dst map(Src src);
}