%Error-UNSUPPORTED: t/t_config_hier.v:36:3: Unsupported: config cell rule
   36 |   instance t.u_1 use work.cfg2 :config;
      |   ^~~~~~~~
                    ... For error description see https://verilator.org/warn/UNSUPPORTED?v=latest
%Error-UNSUPPORTED: t/t_config_hier.v:36:18: Unsupported: config use
   36 |   instance t.u_1 use work.cfg2 :config;
      |                  ^~~
%Error-UNSUPPORTED: t/t_config_hier.v:41:3: Unsupported: config cell rule
   41 |   instance t.u_1 use cfg2 :config;
      |   ^~~~~~~~
%Error-UNSUPPORTED: t/t_config_hier.v:41:18: Unsupported: config use
   41 |   instance t.u_1 use cfg2 :config;
      |                  ^~~
%Error-UNSUPPORTED: t/t_config_hier.v:46:3: Unsupported: config cell rule
   46 |   cell work.m1 use work.cfg2 :config;
      |   ^~~~
%Error-UNSUPPORTED: t/t_config_hier.v:46:8: Unsupported: config cell
   46 |   cell work.m1 use work.cfg2 :config;
      |        ^~~~
%Error-UNSUPPORTED: t/t_config_hier.v:46:16: Unsupported: config use
   46 |   cell work.m1 use work.cfg2 :config;
      |                ^~~
%Error-UNSUPPORTED: t/t_config_hier.v:51:3: Unsupported: config cell rule
   51 |   cell m1 use cfg2 :config;
      |   ^~~~
%Error-UNSUPPORTED: t/t_config_hier.v:51:8: Unsupported: config cell
   51 |   cell m1 use cfg2 :config;
      |        ^~
%Error-UNSUPPORTED: t/t_config_hier.v:51:11: Unsupported: config use
   51 |   cell m1 use cfg2 :config;
      |           ^~~
%Error-UNSUPPORTED: t/t_config_hier.v:56:3: Unsupported: config cell rule
   56 |   cell work.m1 use work.cfg2;   
      |   ^~~~
%Error-UNSUPPORTED: t/t_config_hier.v:56:8: Unsupported: config cell
   56 |   cell work.m1 use work.cfg2;   
      |        ^~~~
%Error-UNSUPPORTED: t/t_config_hier.v:56:16: Unsupported: config use
   56 |   cell work.m1 use work.cfg2;   
      |                ^~~
%Error-UNSUPPORTED: t/t_config_hier.v:62:3: Unsupported: config cell rule
   62 |   instance u_bb use work.c2_bb;
      |   ^~~~~~~~
%Error-UNSUPPORTED: t/t_config_hier.v:62:17: Unsupported: config use
   62 |   instance u_bb use work.c2_bb;
      |                 ^~~
%Error: Exiting due to