On Wed, Apr 17, 2013 at 9:21 PM, John Cowan <[email protected]> wrote:
> 張書瀚 scripsit: > > > But the problem of begin, as I said before, is still there. I don't > > think it's good to deliberately leave that behavior unspecified > > in the standard, so I post it here (for me, it creates unnecessary > > misunderstandings). > > It's a hard problem. Suppose you are using a Scheme system like Chicken > or Gambit, that compiles Scheme code to stand-alone executables. What do > you expect this to do? > > (call/cc (lambda (x) (x))) > Looks like the same as (values) to me. Is there any reason why this might not be the case? I just tested this on Chicken, and it works as expected -- both using the csi repl, and in a compiled program. But, in general, I do agree that capturing a continuation and re-executing it through REPL code shouldn't be relied upon to behave in any predictable way. > > There just isn't any good answer, because the captured continuation is > outside Scheme. Likewise, if you run something like this from a REPL, > you are capturing a continuation in the REPL's own code, which may or > may not be in Scheme. > > Such issues are inherently outside the scope of any Scheme standard. > > -- > John Cowan [email protected] http://ccil.org/~cowan > You cannot enter here. Go back to the abyss prepared for you! Go back! > Fall into the nothingness that awaits you and your Master. Go! --Gandalf >
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