%Warning-WIDTHCONCAT: t/t_param_concat.v:18: Unsized numbers/parameters not allowed in concatenations.
                                           : ... In instance t
         if ({UNSIZED,UNSIZED+1} != {32'd10, 32'd11}) $stop;
              ^~~~~~~
                      ... Use "/* verilator lint_off WIDTHCONCAT */" and lint_on around source to disable this message.
%Warning-WIDTHCONCAT: t/t_param_concat.v:18: Unsized numbers/parameters not allowed in replications.
                                           : ... In instance t
         if ({UNSIZED,UNSIZED+1} != {32'd10, 32'd11}) $stop;
                     ^
%Warning-WIDTHCONCAT: t/t_param_concat.v:19: Unsized numbers/parameters not allowed in replications.
                                           : ... In instance t
         if ({2{UNSIZED}} != {32'd10, 32'd10}) $stop;
                ^~~~~~~
%Error: Exiting due to