%Error-UNSUPPORTED: t/t_inst_recurse_bad.v:18:8: Unsupported: Recursive multiple modules (module instantiates something leading back to itself): 'looped'
                                               : ... note: self-recursion (module instantiating itself directly) is supported.
   18 | module looped ( );
      |        ^~~~~~
                    ... For error description see https://verilator.org/warn/UNSUPPORTED?v=latest
%Error: Exiting due to