  --> [ local path prefix ]/top_ports/out_to_out.fpp:31:5
   |
31 |     A.a -> A.a
   |     ^^^ invalid directions output -> output (should be output -> input)
   |
  ::: [ local path prefix ]/top_ports/out_to_out.fpp:22:3
   |
22 |   port a = c1.pOut
   |   ---------------- from port is specified here
   |
  ::: [ local path prefix ]/top_ports/out_to_out.fpp:22:3
   |
22 |   port a = c1.pOut
   |   ---------------- to port is specified here

