  --> [ local path prefix ]/port_numbering/no_port_available_for_matched_numbering.fpp:43:7
   |
43 |       c1.pOut -> c2.pIn
   |       ^^^^^^^ no port available for matched numbering
   |
  ::: [ local path prefix ]/port_numbering/no_port_available_for_matched_numbering.fpp:43:7
   |
43 |       c1.pOut -> c2.pIn
   |       ------- matched connections are specified here
   |
  ::: [ local path prefix ]/port_numbering/no_port_available_for_matched_numbering.fpp:44:7
   |
44 |       c2.pOut -> c1.pIn
   |       ------- matched connections are specified here
   |
  ::: [ local path prefix ]/port_numbering/no_port_available_for_matched_numbering.fpp:10:5
   |
10 |     match pOut with pIn
   |     ------------------- port matching is specified here
   |
   = note: to be available, a port number must be in bounds and unassigned at each of the matched ports

