libtest-weaken-perl 3.022000-1.1 (amd64 binary) in ubuntu mantic

 A memory leak occurs when a Perl data structure is destroyed but some of the
 contents of that structure are not freed. Leaked memory is a useless
 overhead. Leaks can significantly impact system performance. They can also
 cause an application to abend due to lack of memory. In Perl, circular
 references are a common cause of memory leaks. Circular references are
 allowed in Perl, but data structures containing circular references will leak
 memory unless the programmer takes specific measures to prevent leaks.
 Preventive measures include weakening the references and arranging to break
 the reference cycle just before the structure is destroyed. When using
 circular references, it is easy to misdesign or misimplement a scheme for
 preventing memory leaks. Mistakes of this kind have been hard to detect in a
 test suite. Test::Weaken allows easy detection of unfreed Perl data and
 allows you to examine the unfreed data, even data that would usually have
 been made inaccessible.