recorder.mutations << input
        }

        @Mutate
        void a(MutationRecorder recorder, @Path("firstInput") String input) {
            recorder.mutations << input
        }
    }

    static class FirstInputCreationRule extends RuleSource {
        @Model
        String firstInput() {
            "first"
        }
    }

    static class SecondInputCreationRule extends RuleSource {