  --> [ local path prefix ]/port_numbering/duplicate_instance_name.fpp:22:10
   |
22 | instance c2: C2 base id 0x400
   |          ^^ redefinition of symbol c2
   |
  ::: [ local path prefix ]/port_numbering/duplicate_instance_name.fpp:20:1
   |
20 | instance c2: C2 base id 0x200
   | ----------------------------- previous definition is here

