CvRTrees crashes on destructor when making an object copy (Bug #2835)

CvRTrees crashes on destruction if a copy variable of it is made. My guess is that they point to the same region of memory, instead of allocating new memory in a deep copy manner, and crashes when the two objects try to release the same memory. Here is a sample code that will cause the crash:

int main()
{
    CvRTrees forest;

    // Generate some data for training, the values are not important
    cv::Mat training(100, 2, CV_32F);
    cv::Mat labels(100, 1, CV_32S);

    for(int i=0; i < 100; i++) {
        training.at<float>(i,0) = rand()/(1.0+RAND_MAX);
        training.at<float>(i,1) = rand()/(1.0+RAND_MAX);

        if(i % 2 == 0) {
            labels.at<int>(i) = 1;
        }
        else {
            labels.at<int>(i) = 0;
        }
    }

    forest.train(training, CV_ROW_SAMPLE, labels);

    CvRTrees copy_forest = forest;

    return 0;
}

Output from GDB

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff774dc4f in CvRTrees::clear() ()