// Solution
bool (*LoadFromFileWithBackup)(Callback1<Stream&> serialize, Stream& stream) = & Load;

bool LoadFromFileWithBackup(Callback1<Stream&> serialize, Stream& stream)
{
	StringStream backup;
	backup.SetStoring();
	serialize(backup);
	ASSERT(!backup.IsError());
	stream.SetLoading();
	stream.LoadThrowing();
	try {
		CheckedSerialize(serialize, stream);
	}
	catch(LoadingError) {
		backup.Seek(0);
		backup.SetLoading();
		serialize(backup);
		ASSERT(!backup.IsError());
		return false;
	}
	return true;
}