%Error: t/t_udp_bad_first_input.v:8:7: First UDP port must be the output port
                                     : ... note: In instance 'top'
    8 | input a, b, c;
      |       ^
        ... See the manual at https://verilator.org/verilator_doc.html?v=latest for more assistance.
%Error: Exiting due to