You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: log.rb
    path of file: ./repos/rubygems/lib/rubygems/vendor/molinillo/lib/molinillo/dependency_graph
    
    the code of the file until where you have to start completion: # frozen_string
    
      def each
        return enum_for unless block_given?
        action = @first_action
        loop do
          break unless action
          yield action
          action = action.next
        end
        self
      end