%Error: t/t_interface_colon_bad.v:14:7: Package/class for ':: reference' not found: 'iface'
   14 |       iface::func();   
      |       ^~~~~
%Error: t/t_interface_colon_bad.v:14:14: Can't find definition of task/function: 'func'
   14 |       iface::func();   
      |              ^~~~
%Error: Exiting due to