if (ShouldPreserveIsland(island)) {
      reachable_ops.insert(&op);
      VisitOp(graph, &op, &reachable_ops, &ops_to_visit);
    }
  }

  // Visit transitive ops until no there are no reachable ops left that have not
  // been visited.
  while (!ops_to_visit.empty()) {
    Operation* op = ops_to_visit.pop_back_val();
    VisitOp(graph, op, &reachable_ops, &ops_to_visit);
  }

        walker.walk(bean, new TypeMetadataWalker.InstanceMetadataVisitor() {
            @Override
            public void visitRoot(TypeMetadata typeMetadata, Object value) {
                typeMetadata.visitValidationFailures(null, validationContext);
            }

            @Override

        TypeMetadataWalker.typeWalker(metadataStore, Nested.class).walk(topLevelType, new TypeMetadataWalker.StaticMetadataVisitor() {
            @Override
            public void visitRoot(TypeMetadata typeMetadata, TypeToken<?> value) {
                typeMetadata.visitValidationFailures(null, validationContext);
            }

            @Override

    interface InstanceMetadataWalker extends TypeMetadataWalker<Object, InstanceMetadataVisitor> {}

    interface TypeMetadataVisitor<T> {
        void visitRoot(TypeMetadata typeMetadata, T value);
        void visitNested(TypeMetadata typeMetadata, String qualifiedName, PropertyMetadata propertyMetadata, T value);
    }

            this.registeredTypes = registeredTypes;
            this.softwareTypeImplementationsBuilder = softwareTypeImplementationsBuilder;
        }

        @Override
        public void visitRoot(TypeMetadata typeMetadata, TypeToken<?> value) {
        }

        @Override
        public void visitNested(TypeMetadata typeMetadata, String qualifiedName, PropertyMetadata propertyMetadata, TypeToken<?> value) {