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Re: Read flushing spaces.

Howevere, here is a problem I just thought of:  consider reading in
the expression "'FOO " (the "" are metasyntactic).  If ' uses
READ-SUBEXPRESSION, then the space following FOO doesn't get gobbled;
but then it is left around as a result of the top-level read,
even though it was needed to terminate the top-level expression.
A hairier theory is needed to win completely.