    # File lib/chef/resource.rb, line 457
          def attribute(attr_name, validation_opts={})
            # This atrocity is the only way to support 1.8 and 1.9 at the same time
            # When you're ready to drop 1.8 support, do this:
            # define_method attr_name.to_sym do |arg=nil|
            # etc.
            shim_method="def \#{attr_name}(arg=nil)\n_set_or_return_\#{attr_name}(arg)\nend\n"
            class_eval(shim_method)

            define_method("_set_or_return_#{attr_name.to_s}".to_sym) do |arg|
              set_or_return(attr_name.to_sym, arg, validation_opts)
            end
          end