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>>>>> "RK" == Richard Kelsey <kelsey@xxxxxxx> writes: RK> From: Phil Bewig <pbewig@xxxxxxxxxx> RK> Date: Thu, 20 Feb 2003 15:08:05 +0100 RK> Stream-filter and RK> the various stream-drop functions leak space if they are not implemented RK> properly, something that is hard to do. In fact, in a private e-mail RK> yesterday someone pointed out another space leak involving stream-filter RK> (they were also kind enough to show how to fix it). RK> Comparing the new version of STREAM-FILTER with the one in the proposed SRFI, RK> it appears that this latest space leak could be fixed by including your own RK> versions of DELAY and FORCE in the sample implementation, using one where forcing RK> a stream caused it to stop retaining the generating thunk. You could merge this RK> delay into the STREAM record: The code you posted seems to be essentially the definition of DELAY/FORCE from Scheme 48. However, Phil's old code does leak in Scheme 48 and doesn't leak with the proposed fix. This is just a note---I intend to check next week why this is so. -- Cheers =8-} Mike Friede, Völkerverständigung und überhaupt blabla