 --> [ local path prefix ]/port_instance/duplicate_general.fpp:6:3
  |
6 |   output port p: P
  |   ^^^^^^^^^^^^^^^^ duplicate port instance p
  |
 ::: [ local path prefix ]/port_instance/duplicate_general.fpp:5:3
  |
5 |   sync input port p: P
  |   -------------------- previous instance is here

