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Re: R3.99RS issues (else)

Defining ``else'' to be #t in not sufficient to allow users to use the
``else'' keyword in case-expressions, since that position in the form is
not evaluated.

I see no reason to use #t as the ``otherwise'' clause marker in a
case-expression.  It has no more semantic justification than, say, 17.  The
right name for that spot is ``else''.