  --> [ local path prefix ]/top_ports/implements_missing_port_import_order.fpp:22:23
   |
22 | topology A implements I {
   |                       ^ port interface not implemented
   |
  ::: [ local path prefix ]/top_ports/implements_missing_port_import_order.fpp:10:5
   |
10 |     output port b1: [3] P
   |     --------------------- port instance missing

