Re: [Chicken-users] understanding eval

[Daishi Kato]

OK, so that was stupid.

How about this?

(define a 'values)
(define b '((1 2 3) #(4 5 6))

I'd like to evaluate (values '(1 2 3) '#(4 5 6))
using eval, a and b.

--daishi

At Fri, 22 Feb 2008 13:29:55 +0100,
Peter Bex wrote:
> On Fri, Feb 22, 2008 at 09:22:36PM +0900, Daishi Kato wrote:
> > Hi,
> > 
> > This might be a stupid question,
> > but would someone help me understand the following eval example?
> > I was expecting to get 1.
> 
> You're evaluating (car (1 2 3))
> You want to be evaluating (car (list 1 2 3)) or (car (quote (1 2 3)))
> 
> > 8<------8<------8<------8<------8<------8<------8<------8<------
> > 
> > CHICKEN
> > Version 2.732 - linux-unix-gnu-x86      [ manyargs dload ptables applyhook 
> > cross ]
> > (c)2000-2007 Felix L. Winkelmann        compiled 2007-12-04 on spirits 
> > (Linux)
> > 
> > #;1> (define a 'car)
> > #;2> (define b '(1 2 3))
> > #;3> (eval (list a b))
> > Error: call of non-procedure: 1
> > 
> >         Call history:
> > 
> >         <syntax>                (eval (list a b))
> >         <syntax>                (list a b)
> >         <eval>          (eval (list a b))
> >         <eval>          (list a b)
> >         <syntax>                (car (1 2 3))
> >         <syntax>                (1 2 3)
> >         <eval>          (car (1 2 3))
> >         <eval>          (1 2 3) <--
> 
> Cheers,
> Peter
> -- 
> http://sjamaan.ath.cx
> --
> "The process of preparing programs for a digital computer
>  is especially attractive, not only because it can be economically
>  and scientifically rewarding, but also because it can be an aesthetic
>  experience much like composing poetry or music."
>                                                       -- Donald Knuth