                 should.not.exist Map::__mro__
             if typeof Set isnt "undefined"
                 should.not.exist Set::__mro__
+
 
         describe 'freezes class properties', ->
             # This is just a limitation of the approach and these

            (-> multi D, C, B)
                .should.throw "Inconsistent multiple inheritance"

        it 'makes sure the next constructor after a root class', ->
            obj = new Deriv()
            obj.base1 .should.equal 'base1'

                EditableScrollablePane, ScrollablePane, EditablePane,
                Pane, ScrollingMixin, EditingMixin, Object ]


    describe 'multi', ->

        describe 'instance methods', ->
