%Error: t/t_struct_init.v:53: Assignment pattern contains duplicate entry: b1
                            : ... In instance t
   const b4_t b4_const_c = '{b1: 1'b1, b1: 1'b0, b0:1'b0, b2: 1'b1, b3: 1'b1};
                                       ^~
%Error: Exiting due to
