%Error: t/t_flag_future.v:8:7: Unknown verilator lint message code: 'FUTURE1', in '/*verilator lint_off FUTURE1*/'
    8 |       /*verilator lint_off FUTURE1*/ 
      |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
%Error: t/t_flag_future.v:11:7: Unknown verilator comment: '/*verilator FUTURE2*/'
   11 |       /*verilator FUTURE2*/ 
      |       ^~~~~~~~~~~~~~~~~~~~~
%Error: t/t_flag_future.v:12:7: Unknown verilator comment: '/*verilator FUTURE2 blah blah*/'
   12 |       /*verilator FUTURE2 blah blah*/ 
      |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
%Error: Exiting due to