# File lib/rdoc/context.rb, line 433
  def add_module(class_type, name)
    mod = @classes[name] || @modules[name]
    return mod if mod

    full_name = child_name name
    mod = RDoc::TopLevel.modules_hash[full_name] || class_type.new(name)

    add_class_or_module(mod, @modules, RDoc::TopLevel.modules_hash)
  end