It doesn't, with rare exceptions.

[[Details.]]

[TCT] takes memory leaks [[ref]] very seriously.  Few ever escape into a release, 
and few known ones survive long.

'''However''', there are at least an order of magnitude more ''perceived'' memory 
leaks.  These result mainly from two causes:
   * mis-measured memory use
   * userland, or application-level, memory leaks.

[[More explanation.]]