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Author: Stan Eisenstat
Subject: Invalid arguments
Date: Saturday, 28 Mar 2020, 14:43:13


There have been a number of postings and responses about
invalid arguments to Deque functions.  At the suggestion
of the staff, here is a hint:

  If the s argument to remD() or headD() is NULL, then s
  is invalid and both functions should return FALSE.

--Stan-
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