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On Sat, Dec 28, 2002 at 12:28:25AM +0100, Peter Prade wrote: > > very interesting indeed. > > i don't think i have seen this idea to implement a new datatype with > closures before. > see http://mitpress.mit.edu/sicp/full-text/book/book-Z-H-14.html#%_sec_2.1.3 -taj