%Error: t/t_unconnected_bad.v:7:1: Bad `unconnected_drive syntax
    7 | `unconnected_drive
      | ^~~~~~~~~~~~~~~~~~
        ... See the manual at https://verilator.org/verilator_doc.html?v=latest for more assistance.
%Error: t/t_unconnected_bad.v:9:1: Bad `unconnected_drive syntax
    9 | `unconnected_drive pull2
      | ^~~~~~~~~~~~~~~~~~
%Error: t/t_unconnected_bad.v:9:20: syntax error, unexpected IDENTIFIER
    9 | `unconnected_drive pull2
      |                    ^~~~~
%Error: Exiting due to