class RDoc::ClassModule

def superclass=(superclass)
  raise NoMethodError, "#{full_name} is a module" if module?
  case superclass
  when RDoc::ClassModule
    @superclass = superclass.full_name
  when nil, String
    @superclass = superclass
  else
    raise TypeError, "superclass must be a String or RDoc::ClassModule, not #{superclass.class}"
  end
end