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Re: Order of the evaluation of elements in a quasiquote list.


From: Kjetil Svalastog Matheussen
Subject: Re: Order of the evaluation of elements in a quasiquote list.
Date: Sun, 3 Apr 2005 14:09:15 +0200 (CEST)

On Sun, 3 Apr 2005 address@hidden wrote:

> On Sun, Apr 03, 2005 at 01:38:04PM +0200, Kjetil Svalastog Matheussen wrote:
> > On Sun, 3 Apr 2005, Neil Jerram wrote:
> > 
> > > Kjetil Svalastog Matheussen wrote:
> > > > Hi, I have recently stumbled upon various bugs in my code
> > > > because the order of the evaluation of the elements in a quasiquote
> > > > list changes.
> > > 
> > > Changes how?  Can you give us an example, to make things concrete?
> > > 
> > 
> > Sorry, this is the stripped down version of the cause of the bug I'm 
> > finding various places:
> > 
> > (let ((a 1))
> >   `( ,(begin (set! a 2) a)
> >      ,a))
> > -> (2 1)
> > 
> > 
> > Wouldn't it be better if this one returned (2 2)?
> 
> Why do you think that "(2 2)" would be _better_? (How do you define
> "better" ?)


It just feels more logical, left to right, top to bottom.

Thanks for the information, I had a small hope
that this was a bug in guile, or that the behaviour could be
changed with a switch. I'll fix up my code.

-- 





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