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Computing (FOLDOC) dictionary
heisenbug
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jargon /hi:'zen-buhg/ (From Heisenberg's Uncertainty
Principle in quantum physics) A bug that disappears or alters
its behaviour when one attempts to probe or isolate it. (This
usage is not even particularly fanciful; the use of a debugger
sometimes alters a program's operating environment
significantly enough that buggy code, such as that which
relies on the values of uninitialised memory, behaves quite
differently.)