%Error-UNSUPPORTED: t/t_struct_unpacked_init.v:12:24: Unsupported: Initial values in struct/union members
                                                    : ... In instance t
   12 |       bit [3:0] m_lo = P;
      |                        ^
                    ... For error description see https://verilator.org/warn/UNSUPPORTED?v=latest
%Error: Exiting due to
