[<<][staapl][>>][..]
Sun Apr 1 16:52:47 EDT 2007

breath-first

i think this is the first time i ever encountered a problem that's
easier solved using breadth first expansion.

hmm.. that's probably plain bullshit.. it's just my particular
approach at this moment using an 'infinite' expansion with an escape
continuation:

(define (expand e)
  (call/cc
    (lambda (done)
       (let ((expand-once
              (lambda (f) ...
                      (done e))))
            (expand (expand-once e))))))

basicly, this just iterates expand over and over, and backtracks to
the last correct expansion 'e' whenever some termination point is
reached in expand-once.

ok, abstracted in 'expand/done'




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