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>>>>> "Matze" == Matthias Neubauer <neubauer@xxxxxxxxxxxxxxxxxxxxxxxxxx> writes: Matze> The real problem is see is the following: as soon as I apply some kind Matze> of abstraction over STREAM-FILTER---which is something every Schemer Matze> wants to do of course---, hell breaks loose again. E.g., if I type Matze> (define (filter-zero stream) Matze> (stream-filter (lambda (x) (zero? x)) Matze> stream)) Matze> (stream-car (filter-zero (stream-from 1))) Matze> in scsh, I will again see a space leak. Matze> Considering all the major Scheme implementations, how common is it to Matze> use a flat closure representation for procedures? This won't be solved by flat closures---the call to FILTER-ZERO is a non-tail call, and it'd be necessary to mark dead variables in continuation frames to make this not leak. There's provision for doing that in Scheme 48, but a compiler which exploits it is still in the works. (That specific part is functional, though.) -- Cheers =8-} Mike Friede, Völkerverständigung und überhaupt blabla