this.method = method;
            this.rule = rule;
        }
    }

    @VisibleForTesting
    static abstract class DefaultExtractedRuleSource<T> implements ExtractedRuleSource<T> {
        private final List<ExtractedRuleDetails> rules;

        public DefaultExtractedRuleSource(List<ExtractedRuleDetails> rules) {
            this.rules = rules;
        }

        @VisibleForTesting // used in tests only

            new ModelThing("foo")
        }
    }

    <T> List<ExtractedModelRule> extract(Class<T> source) {
        (extractor.extract(source) as ModelRuleExtractor.DefaultExtractedRuleSource).rules
    }

    def "can inspect class with simple model creation rule"() {
        def registry = Mock(ModelRegistry)

        when:

Class <org.gradle.model.internal.inspect.ModelRuleExtractor$DefaultExtractedRuleSource$1> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (ModelRuleExtractor.java:0)
Class <org.gradle.model.internal.inspect.ModelRuleExtractor$DefaultExtractedRuleSource$2> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (ModelRuleExtractor.java:0)