code: private static boolean hasMoreTagsToResolve(ObjectType objectType) {
      checkArgument(objectType.isUnknownType());
      FunctionType ctor = objectType.getConstructor();
      if (ctor != null) {
        // interface extends interfaces
        for (ObjectType interfaceType : ctor.getExtendedInterfaces()) {
          if (!interfaceType.isResolved()) {
            return true;
          }
        }
      }
      if (objectType.getImplicitPrototype() != null) {
        // constructor extends class
        return !objectType.getImplicitPrototype().isResolved();
      }
      return false;
    }
docs: Check whether a type is resolvable in the future
  If this has a supertype that hasn't been resolved yet, then we can assume
  this type will be OK once the super type resolves.
  @param objectType
  @return true if objectType is resolvable in the future