Minimal program that has problem with streaming features

gistfile1.txt

#include <shogun/io/streaming/StreamingAsciiFile.h>
#include <shogun/features/streaming/StreamingSparseFeatures.h>

using namespace shogun;

int main(int argc, char *argv[])
{
	init_shogun();

	CStreamingAsciiFile *file=new CStreamingAsciiFile("trivial-crash-example.dat");
	SG_REF(file);

	CStreamingSparseFeatures<float64_t> *stream_features=
			new CStreamingSparseFeatures<float64_t>(file, true, 1024);
	SG_REF(stream_features);

	stream_features->start_parser();
	while (stream_features->get_next_example())
	{
		// first try: this one leads to double-free in SG_UNREF(stream)
		stream_features->get_vector();

		stream_features->release_example();
	}
	stream_features->end_parser();

	// double free
	SG_UNREF(stream_features);
	SG_UNREF(file);

	exit_shogun();
	return 0;
}

trivial-crash-example.dat

0 5:-1
1 92:1
0 10:1