%Error: t/t_interface_missing_bad.v:13: Cannot find file containing interface: 'foo_intf'
   foo_intf foo
   ^~~~~~~~
%Error: t/t_interface_missing_bad.v:19: Cannot find file containing interface: 'foo_intf'
   foo_intf the_foo ();
   ^~~~~~~~
%Error: t/t_interface_missing_bad.v:24: Found definition of 'the_foo' as a CELL but expected a variable
        .foo (the_foo)
              ^~~~~~~
%Error: Exiting due to