def <<(value)
      value = value.to_s
      value = ERB::Util.h(value) unless value.html_safe?
      @block.call(value)
    end
def <<(value)
      value = value.to_s
      value = ERB::Util.h(value) unless value.html_safe?
      @block.call(value)
    end
:nodoc: