%Error-NEEDTIMINGOPT: t/t_timing_off.v:25:8: Use --timing or --no-timing to specify how event controls should be handled
                                           : ... In instance t
   25 |        @e1;
      |        ^
                      ... For error description see https://verilator.org/warn/NEEDTIMINGOPT?v=latest
%Error-NEEDTIMINGOPT: t/t_timing_off.v:33:12: Use --timing or --no-timing to specify how delays should be handled
                                            : ... In instance t
   33 |    initial #2 ->e1;
      |            ^
%Error-NEEDTIMINGOPT: t/t_timing_off.v:37:12: Use --timing or --no-timing to specify how delays should be handled
                                            : ... In instance t
   37 |    initial #3 $stop;  
      |            ^
%Error-NEEDTIMINGOPT: t/t_timing_off.v:38:12: Use --timing or --no-timing to specify how delays should be handled
                                            : ... In instance t
   38 |    initial #1 @(e1, e2) #1 $stop;  
      |            ^
%Error-NEEDTIMINGOPT: t/t_timing_off.v:38:15: Use --timing or --no-timing to specify how event controls should be handled
                                            : ... In instance t
   38 |    initial #1 @(e1, e2) #1 $stop;  
      |               ^
%Error-NEEDTIMINGOPT: t/t_timing_off.v:38:25: Use --timing or --no-timing to specify how delays should be handled
                                            : ... In instance t
   38 |    initial #1 @(e1, e2) #1 $stop;  
      |                         ^
%Error: Exiting due to