code: void expectAnyObject(Node n, JSType type, String msg) {
      JSType anyObjectType = getNativeType(NO_OBJECT_TYPE);
      if (!anyObjectType.isSubtypeOf(type) && !type.isEmptyType()) {
        mismatch(n, msg, type, anyObjectType);
      }
    }
docs: Expect the type to contain an object sometimes. If the expectation is not met, issue a warning
  at the provided node's source code position.