  --> [ local path prefix ]/port_numbering/duplicate_output_connection.fpp:25:5
   |
25 |     c1.pOut[0] -> c2.pIn
   |     ^^^^^^^ duplicate connection at output port 0
   |
  ::: [ local path prefix ]/port_numbering/duplicate_output_connection.fpp:24:5
   |
24 |     c1.pOut[0] -> c2.pIn
   |     ------- previous occurrence is here

