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dead code

   calls to them have been removed, or code that cannot be reached
   because it is guarded by a control structure that provably must
   always transfer control somewhere else.  The presence of dead code
   may reveal either logical errors due to alterations in the program
   or significant changes in the assumptions and environment of the
   program (see also software rot); a good compiler should report
   dead code so a maintainer can think about what it means.
   (Sometimes it simply means that an *extremely* defensive
   programmer has inserted can't happen tests which really can't
   happen --- yet.)  Syn. grunge.