run (Spec::Example::ExampleGroupMethods)

    # File lib/spec/example/example_group_methods.rb, line 94
          def run(run_options)
            examples = examples_to_run(run_options)
            notify(run_options.reporter) unless examples.empty?
            return true if examples.empty?
            return dry_run(examples, run_options) if run_options.dry_run?

            define_methods_from_predicate_matchers

            success, before_all_instance_variables = run_before_all(run_options)
            success, after_all_instance_variables  = run_examples(success, before_all_instance_variables, examples, run_options)
            success                                = run_after_all(success, after_all_instance_variables, run_options)
          end