psych_yaml_as

# File ext/psych/lib/psych/core_ext.rb, line 21
  def psych_yaml_as url
    return if caller[0].end_with?('rubytypes.rb')
    if $VERBOSE
      warn "#{caller[0]}: yaml_as is deprecated, please use yaml_tag"
    end
    Psych.add_tag(url, self)
  end