upgrade_to_class

# File lib/rdoc/context.rb, line 1198
  def upgrade_to_class mod, class_type, enclosing
    enclosing.modules_hash.delete mod.name

    klass = RDoc::ClassModule.from_module class_type, mod
    klass.store = @store

    # if it was there, then we keep it even if done_documenting
    @store.classes_hash[mod.full_name] = klass
    enclosing.classes_hash[mod.name]   = klass

    klass
  end