default (Spec::Example::ExampleGroupFactory::ClassMethods)

    # File lib/spec/example/example_group_factory.rb, line 53
            def default(example_group_class)
              Spec.__send__ :remove_const, :ExampleGroup if Spec.const_defined?(:ExampleGroup)
              Spec.const_set(:ExampleGroup, example_group_class)
              old = @example_group_types
              @example_group_types = Hash.new(example_group_class)
              @example_group_types.merge!(old) if old
            end