internal error when using invalid designator class in C-FFI

[waywardmonkeys]

I have an invalid designator class in my C-FFI usage:

define C-subtype <foo> (<void*>) end;

And I get this internal error:

Computing models for c-wrapper.dylan

Internal error: : #f is not of type {<class>: <&designator-class>}

[waywardmonkeys]

This might be related to this method:

define method verify-mapped-subtype-options (fragment, name, supers,
                                             partial-import-function,
                                             partial-export-function,
                                             import-type,
                                             export-type,
                                             pointer-type-name,
                                             define-pointer-value-setter)
 => ();
  // !@#$ do this error checking
  values();
end;