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I didn't change anything!

   bugs manifest during a regression test.  The canonical reply to
   this assertion is "Then it works just the same as it did before,
   doesn't it?"  See also one-line fix.  This is also heard from
   applications programmers trying to blame an obvious applications
   problem on an unrelated systems software change, for example a
   divide-by-0 fault after terminals were added to a network.
   Usually, their statement is found to be false.  Upon close
   questioning, they will admit some major restructuring of the
   program that shouldn't have broken anything, in their opinion,
   but which actually hosed the code completely.