%Error: t/t_interface_typo_bad.v:13: Parent cell's interface is not found: 'foo_intf'
   foo_intf foo
   ^~~~~~~~
%Error: t/t_interface_typo_bad.v:21: Cannot find file containing interface: 'fo_intf'
   fo_intf the_foo;
   ^~~~~~~
%Error: t/t_interface_typo_bad.v:26: Found definition of 'the_foo' as a CELL but expected a variable
        .foo (the_foo)
              ^~~~~~~
%Error: Exiting due to
