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[no subject]

    Date: Friday, 3 October 1986  16:36-EDT
    From: Stephen E. Robbins <STEVER%MX.LCS.MIT.EDU at MC.LCS.MIT.EDU>

    ...Is the result of extracting past the end of a subsequence
    considered undefined?


Yes.  Although it isn't explicitly stated when :END is discussed on
page 246, the discussion doesn't make any sense otherwise.  One could
hypothesize a magical exception in the case where END is greater than
the length, but there is nothing in the manual to support such a
conclusion.  There are many illegal things which are not explicitly
stated to be illegal in the manual.