  --> [ local path prefix ]/connection_direct/internal_port.fpp:12:5
   |
12 |     c.pInternal -> c.pIn
   |     ^^^^^^^^^^^ cannot connect to internal port
   |
  ::: [ local path prefix ]/connection_direct/internal_port.fpp:3:3
   |
 3 |   internal port pInternal
   |   ----------------------- port instance is specified here

