*<Null safety>*
int alloc (int size)
int alloc(int size) { if (_nextOutOfLineDepth > _maxOutOfLineDepth) { throw FidlError('Exceeded maxOutOfLineDepth', FidlErrorCode.fidlExceededMaxOutOfLineDepth); } _nextOutOfLineDepth++; int offset = _extent; _claimMemory(_align(size)); return offset; }