module Ruby
  module Named
    attr_reader :name
    def initialize name
      @name = name
    end
    def each(&block)
    end
  end

  class LocalVariable < Expression
    include Named
    def to_s
      name.to_s
    end
  end

  class InstanceVariable < Expression
    include Named
    # used to collect type information
    def add_ivar( array )
      array << @name
    end
    def to_s
      "@#{name}"
    end
  end

  class ClassVariable < Expression
    include Named
  end

  class ModuleName < Expression
    include Named
  end
end