%Warning-UNUSED: t/t_lint_unused_bad.v:16: Bits of signal are not used: 'assunu1'[5:1]
                                         : ... In instance t.sub
   wire [5:0] assunu1 = 0;   
              ^~~~~~~
                 ... Use "/* verilator lint_off UNUSED */" and lint_on around source to disable this message.
%Warning-UNDRIVEN: t/t_lint_unused_bad.v:20: Bits of signal are not driven: 'udrb2'[14:13,11]
                                           : ... In instance t.sub
   wire [15:10] udrb2;   
                ^~~~~
%Warning-UNUSED: t/t_lint_unused_bad.v:25: Signal is not driven, nor used: 'unu3'
                                         : ... In instance t.sub
   wire       unu3;   
              ^~~~
%Warning-UNUSED: t/t_lint_unused_bad.v:27: Bits of signal are not driven, nor used: 'mixed'[3]
                                         : ... In instance t.sub
   wire [3:0] mixed;   
              ^~~~~
%Warning-UNUSED: t/t_lint_unused_bad.v:27: Bits of signal are not used: 'mixed'[2]
                                         : ... In instance t.sub
   wire [3:0] mixed;   
              ^~~~~
%Warning-UNDRIVEN: t/t_lint_unused_bad.v:27: Bits of signal are not driven: 'mixed'[1]
                                           : ... In instance t.sub
   wire [3:0] mixed;   
              ^~~~~
%Error: Exiting due to