%Error-UNSUPPORTED: t/t_implements_contents_bad.v:7:11: Unsupported: interface classes
    7 | interface class Icls;
      |           ^~~~~
                    ... For error description see https://verilator.org/warn/UNSUPPORTED?v=latest
%Error: t/t_implements_contents_bad.v:8:8: Interface class cannot contain non-parameter members (IEEE 1800-2017 8.26)
    8 |    int badi;
      |        ^~~~
%Error: t/t_implements_contents_bad.v:9:9: Interface class functions must be pure virtual (IEEE 1800-2017 8.26)
    9 |    task badtask;
      |         ^~~~~~~
%Error: Exiting due to