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expansion of LETREC

Is your DELAY "forced" automatically on reference?  If not I don't
understand how this works.  Neither of the 2 versions of DELAY that
I'm familiar with (automatic forcing by appropriate primitives and
explicit forcing) would solve the problem.  If it is forced on
reference then it seems pretty useless (useful only for this?) since
one of the crucial features of DELAY is that CONS does not force it,
so streams can be built on top of it.