visit_array_subclass

# File ext/psych/lib/psych/visitors/yaml_tree.rb, line 450
      def visit_array_subclass o
        tag = "!ruby/array:#{o.class}"
        ivars = o.instance_variables
        if ivars.empty?
          node = @emitter.start_sequence(nil, tag, false, Nodes::Sequence::BLOCK)
          register o, node
          o.each { |c| accept c }
          @emitter.end_sequence
        else
          node = @emitter.start_mapping(nil, tag, false, Nodes::Sequence::BLOCK)
          register o, node

          # Dump the internal list
          accept 'internal'
          @emitter.start_sequence(nil, nil, true, Nodes::Sequence::BLOCK)
          o.each { |c| accept c }
          @emitter.end_sequence

          # Dump the ivars
          accept 'ivars'
          @emitter.start_mapping(nil, nil, true, Nodes::Sequence::BLOCK)
          ivars.each do |ivar|
            accept ivar
            accept o.instance_variable_get ivar
          end
          @emitter.end_mapping

          @emitter.end_mapping
        end
      end