1%Warning-WIDTHCONCAT: t/t_param_concat.v:19:15: Unsized numbers/parameters not allowed in concatenations. 2 : ... In instance t 3 19 | if ({UNSIZED,UNSIZED+1} != {32'd10, 32'd11}) $stop; 4 | ^~~~~~~ 5 ... For warning description see https://verilator.org/warn/WIDTHCONCAT?v=latest 6 ... Use "/* verilator lint_off WIDTHCONCAT */" and lint_on around source to disable this message. 7%Warning-WIDTHCONCAT: t/t_param_concat.v:19:22: Unsized numbers/parameters not allowed in replications. 8 : ... In instance t 9 19 | if ({UNSIZED,UNSIZED+1} != {32'd10, 32'd11}) $stop; 10 | ^ 11%Warning-WIDTHCONCAT: t/t_param_concat.v:20:17: Unsized numbers/parameters not allowed in replications. 12 : ... In instance t 13 20 | if ({2{UNSIZED}} != {32'd10, 32'd10}) $stop; 14 | ^~~~~~~ 15%Error: Exiting due to 16