I don't have your answer, but an interesting anecdote: I learned recently why 
the setTimeout(k, 0) trick is so slow. Apparently too many web sites (including 
nytimes.com, I believe) rely on a minimum delay of somewhere between 4 and 10ms 
to do animations, so browsers have to throttle the events. As I understand it, 
Firefox uses a 10ms minimum delay, and Chrome uses 4ms.

Since Chrome seems to have gotten away with dropping it to 4ms, we may be able 
to do the same -- though I haven't heard anyone specifically say they planned 
to. Maybe at some point we can eliminate this silliness altogether, and 
setTimeout could become a more viable tool for compiler-writers. But happily, 
the ECMAScript committee recently agreed to try to mandate proper tail calls in 
the next version of the standard. So with a little (okay, maybe more than a 
little) luck, compiler-writers may eventually be able to rely on having tail 
calls built in to the web.

Dave

On Jan 29, 2011, at 9:12 PM, YC wrote:

> Hi all - 
> 
> I am wondering if there are documentations on how moby/wescheme solve the 
> tail call optimization issue to compile down to javascript.  My google'fu is 
> failing me. 
> 
> If not - can someone shed some light on how it's done?  
> 
> Thanks,
> yc
> 
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