  --> [ local path prefix ]/port_instance/duplicate_command_recv.fpp:10:3
   |
10 |   command recv port p2
   |   ^^^^^^^^^^^^^^^^^^^^ duplicate port instance CommandRecv
   |
  ::: [ local path prefix ]/port_instance/duplicate_command_recv.fpp:9:3
   |
 9 |   command recv port p1
   |   -------------------- previous instance is here

