%Warning-MULTIDRIVEN: t/t_dfg_multidriver_dfg_bad.v:13:18: Bits [3:1] of signal 'a' have multiple combinational drivers : ... In instance t t/t_dfg_multidriver_dfg_bad.v:14:19: ... Location of first driver 14 | assign a[3:0] = i[3:0]; | ^ t/t_dfg_multidriver_dfg_bad.v:15:19: ... Location of other driver 15 | assign a[4:1] = ~i[4:1]; | ^ t/t_dfg_multidriver_dfg_bad.v:13:18: ... Only the first driver will be respected ... For warning description see https://verilator.org/warn/MULTIDRIVEN?v=latest ... Use "/* verilator lint_off MULTIDRIVEN */" and lint_on around source to disable this message. %Warning-MULTIDRIVEN: t/t_dfg_multidriver_dfg_bad.v:13:18: Bits [3:3] of signal 'a' have multiple combinational drivers : ... In instance t t/t_dfg_multidriver_dfg_bad.v:14:19: ... Location of first driver 14 | assign a[3:0] = i[3:0]; | ^ t/t_dfg_multidriver_dfg_bad.v:16:17: ... Location of other driver 16 | assign a[3] = ~i[3]; | ^ t/t_dfg_multidriver_dfg_bad.v:13:18: ... Only the first driver will be respected %Warning-MULTIDRIVEN: t/t_dfg_multidriver_dfg_bad.v:13:18: Bits [7:6] of signal 'a' have multiple combinational drivers : ... In instance t t/t_dfg_multidriver_dfg_bad.v:17:19: ... Location of first driver 17 | assign a[8:5] = i[8:5]; | ^ t/t_dfg_multidriver_dfg_bad.v:18:19: ... Location of other driver 18 | assign a[7:6] = ~i[7:6]; | ^ t/t_dfg_multidriver_dfg_bad.v:13:18: ... Only the first driver will be respected %Warning-MULTIDRIVEN: t/t_dfg_multidriver_dfg_bad.v:13:18: Bits [9:9] of signal 'a' have multiple combinational drivers : ... In instance t t/t_dfg_multidriver_dfg_bad.v:19:17: ... Location of first driver 19 | assign a[9] = i[9]; | ^ t/t_dfg_multidriver_dfg_bad.v:20:19: ... Location of other driver 20 | assign a[9] = ~i[9]; | ^ t/t_dfg_multidriver_dfg_bad.v:13:18: ... Only the first driver will be respected %Error: Exiting due to