Analyse following RPM build log snippet. Describe contents accurately, without speculation or suggestions for resolution.            
Your analysis must be as concise as possible, while keeping relevant information intact.
Snippet: 
AssertionError: 3 != 4 : Memory leak!  Expected a ref count of 4 for svn_merge_range_t object, but got 3 instead (path: b'/trunk', index: 0).  Probable cause: incorrect Py_INCREF/Py_DECREF usage in libsvn_swig_py/swigutil_py.c.
Cause of first failed test.