%Error-UNSUPPORTED: t/t_randomize_extern.v:17:4: Unsupported: extern constraint
   17 |    extern constraint ex;
      |    ^~~~~~
                    ... For error description see https://verilator.org/warn/UNSUPPORTED?v=latest
%Error-UNSUPPORTED: t/t_randomize_extern.v:21:1: Unsupported: extern constraint
   21 | constraint Packet::ex { header == 2; }
      | ^~~~~~~~~~
%Error: Exiting due to