determine_superclass (Spec::Example::ExampleGroupFactory::ClassMethods)

    # File lib/spec/example/example_group_factory.rb, line 67
            def determine_superclass(opts)
              if type = opts[:type]
                self[type]
              elsif opts[:location] =~ /spec(\\|\/)(#{@example_group_types.keys.sort_by{|k| k.to_s.length}.reverse.join('|')})/
                self[$2 == '' ? nil : $2.to_sym]
              else
                self[nil]
              end
            end