On Mon, Oct 13, 2008 at 9:27 PM, David-Sarah Hopwood
<[EMAIL PROTECTED]> wrote:
> MarkM is right that it just falls out of the natural tail-recursive
> encoding of a for loop. I got the above expansion wrong by trying to do
> it imperatively, which was silly -- the tail-recursive expansion is much
> simpler:
>
> for (let i = initExpr; condExpr; updateExpr) { body }
> ==>
> { let ($loop = lambda(i) {
> if (condExpr) {
> { body } (updateExpr); $loop(i);
> }
> }) { $loop(initExpr); } }
Close. The problem is that updateExpr modifies the same i that's in
scope in body, so any closure mentioning i in body captures an i
that's modified by the update expression.
--
Cheers,
--MarkM
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