On Jun 21, 2012, at 1:24 AM, Eli Barzilay wrote: > An hour and a half ago, John Clements wrote: > > >> Yes, of course I can do it the ugly way: >> [...] >> (define p1 (mcons #f 'bogus)) >> (set-mcdr! p1 p1) >> (define true-then-falses (mcons #t p1)) > > What about > > (shared ([fs (cons #f fs)]) (cons #t fs)) > (cons #t (shared ([fs (cons #f fs)]) fs))
Right! Shared is what I was thinking of. Many thanks. John
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