comp.lang.scheme Google Group

Re: R6RS test suite

2008-07-26T14:26:27Z

Thank you for your input.
Now I understand why the letrec violation raises &asserion but not
&syntax!
I'm very happy to know that :)
Yes, it is! :)

Re: R6RS test suite

2008-07-26T13:25:13Z

That's a good test to add :)

Re: R6RS test suite

2008-07-26T12:59:32Z

I believe that the R6RS requires that this check be done at runtime
(at least sometimes). In section 11.4.6, discussing `letrec', it says,
under Implementation Responsibilities (emphasis mine):
Implementations must detect references to a <variable> during the
EVALUATION of the <init> expressions (using one particular evaluation

Re: R6RS test suite

2008-07-26T12:32:50Z

Great! I've updated "README.txt" in SVN.
Thanks,
Matthew

Scheme classes? defstruct or class?

2008-07-26T10:57:02Z

is defstruct the equivalence of python classes?
the whole interface to scheme classes seem very complicated...
i just want to do:
(define-class (person idnbr songs)....

Re: R6RS test suite

2008-07-26T08:49:14Z

I have released Ypsilon 0.9.5-update2 at:
[link]
It recognize '.sls' extension and autoload test suite libraries. :)
I write the description for "Hints on running the tests" section.
Please check.
============================== =
Ypsilon 0.9.5-update2
------
Put this directory at "<somewhere>/tests/r6rs" and run with "run.sps"

Re: parentheses in cond

2008-07-26T01:16:59Z

I am curious why you'd prefer to use '#t' in this case instead of 'else'.
Frank

Re: Learning purposes Scheme interpreterer with support for continuations?

2008-07-25T17:29:02Z

Watching a video is a lot more fun. :-)
Mark Feeley's 90-minute scheme-2-c speach:
[link]

Re: Learning purposes Scheme interpreterer with support for continuations?

2008-07-25T16:51:29Z

On 18 Lug, 09:21, Slobodan Blazeski <slobodan.blaze...@gmail.com>
wrote:
You might want to check out how it's done in Chicken Scheme.
If I understand correctly, it transforms all the code in continuation
passing style, implementing first-order continuations in this form
should be easy.

SRFI 99: ERR5RS Records

2008-07-25T16:01:09Z

This announces the availability for discussion of
Scheme Request for Implementation 99
"ERR5RS Records"
by William D Clinger.
Its draft and an archive of the ongoing discussion is available at
[link]
You can join the discussion of the draft by sending an email message
with a "subscribe" subject line to

Re: parentheses in cond

2008-07-25T07:10:01Z

Did you miss the else before (fab-iter b (+ a b) (- n 1))?
Cheers
leppie

Re: parentheses in cond

2008-07-25T05:45:01Z

The first program correctly indented is:
(define (fab-iter a b n)
(cond ((= 1 n)
a)
(fab-iter ; fab-iter is not #f then it's true.
b ; evaluate b, forget the result
(+ a b) ; evaluate (+ a b), forget the result
(- n 1)))) ; evaluate (- n 1) and return it.

Re: parentheses in cond

2008-07-25T05:25:59Z

thanks Barry!

Re: parentheses in cond

2008-07-25T04:47:58Z

In article
<33cdbb42-cf8d-4bc7-87ea-88ea2 c278...@q5g2000prf.googlegroup s.com>,
Actually, it should be:
(define (fab-iter a b n)
(cond ((= 1 n) a)
(#t (fab-iter b (+ a b) (- n 1))))
The syntax of cond is:
(cond (test1 results1 ...)
(test2 results2 ...)
...)
So each clause must be a list starting with a test and followed by the

Commercial Users of Functional Programming Workshop Call for Participation

2008-07-22T21:31:13Z

Commercial Users of Functional Programming Workshop (CUFP) 2008
Functional Programming As a Means, Not an End
Call for Participation
Sponsored by SIGPLAN
Co-located with ICFP 2008
______________________________ ______________________________ ______