  --> [ local path prefix ]/tlm_packets/duplicate_packet_name.fpp:11:5
   |
11 | /     packet P group 1 {
12 | |       c1.T
13 | |     }
   | |_____^ duplicate packet name P
   |
  ::: [ local path prefix ]/tlm_packets/duplicate_packet_name.fpp:7:5
   |
 7 | /     packet P group 0 {
 8 | |       c1.T
 9 | |     }
   | |_____- previous occurrence is here

