Hi, From: Matthew Flatt <mfl...@cs.utah.edu>
> At Mon, 02 Aug 2010 21:54:54 +0900 (JST), Keiko Nakata wrote: > > Why this code > > > > (let ([d (box #f)] [a (box 0)]) > > (print (+ (begin (let/cc k (begin (set-box! d k) (set-box! a 2) 3))) > > (unbox > > a))) > > ((unbox d) 9)) > > > > prints 511111111, rather than 59999999? > > I'm not sure I'm following. Can you say more about why you expect > infinite "9"s instead of infinite "11"s? I wanted to undo the assignment (set-box! d k), but I think I am confusing. I'm a novice to continuations... I used begin to enforce sequentiality, but seemed to be trapped by it. (And eventually I wanted to undo force-ing delayed variables using call/cc...) Keiko _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
