%Error: t/t_implements_noninterface_bad.v:10:26: Attempting to implement from non-interface class 'NotIcls'
... Suggest use 'extends'
   10 | class ClsBad1 implements NotIcls;
      |                          ^~~~~~~
%Error: t/t_implements_noninterface_bad.v:16:23: Attempting to extend from interface class 'Icls'
... Suggest use 'implements'
   16 | class ClsBad2 extends Icls;
      |                       ^~~~
%Error: Exiting due to
