%Error: t/t_var_dup2_bad.v:12: Duplicate declaration of signal: bad_o_w
        t/t_var_dup2_bad.v:12: ... note: ANSI ports must have type declared with the I/O (IEEE 2017 23.2.2.2)
        t/t_var_dup2_bad.v:9: ... Location of original declaration
%Error: t/t_var_dup2_bad.v:13: Duplicate declaration of signal: bad_o_r
        t/t_var_dup2_bad.v:10: ... Location of original declaration
%Error: Exiting due to