NULL_SYMBOL       251 third_party/protobuf/src/google/protobuf/descriptor.cc   inline Symbol() : type(NULL_SYMBOL) { descriptor = NULL; }
NULL_SYMBOL       252 third_party/protobuf/src/google/protobuf/descriptor.cc   inline bool IsNull() const { return type == NULL_SYMBOL; }
NULL_SYMBOL       278 third_party/protobuf/src/google/protobuf/descriptor.cc       case NULL_SYMBOL: return NULL;