* poe.scm perfect-funcq bit rot
@ 2003-09-20 23:22 Kevin Ryde
2003-10-07 15:53 ` Marius Vollmer
0 siblings, 1 reply; 3+ messages in thread
From: Kevin Ryde @ 2003-09-20 23:22 UTC (permalink / raw)
I was silly enough to try poe.scm,
(use-modules (ice-9 poe))
(define p (perfect-funcq 123 noop))
(p 'x)
and got
In procedure caar in expression (caar alist):
Wrong type argument in position 1: ()
ABORT: (wrong-type-arg)
This is in funcq-assoc, and I think that function looks fairly
doubtful as it stands.
It seems to be assuming '() is false, which might be some bit-rot, and
I also can't see how it works its way down the given alist, it looks
like the and-map loop will only examine the first entry.
Perhaps (below),
* poe.scm (funcq-assoc): Rewrite, don't assume '() is false, actually
traverse the given alist.
This quietly drops the "let ((it ..." business, which I assume serves
no purpose.
This would probably be for 1.6 too, though it's all undocumented so
doesn't really rate.
;; return true if lists X and Y are the same length and each element is `eq?'
(define (eq?-list x y)
(if (null? x)
(null? y)
(and (not (null? y))
(eq? (car x) (car y))
(eq?-list (cdr x) (cdr y)))))
(define (funcq-assoc arg-list alist)
(if (null? alist)
#f
(if (eq?-list arg-list (caar alist))
(car alist)
(funcq-assoc arg-list (cdr alist)))))
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2003-09-20 23:22 poe.scm perfect-funcq bit rot Kevin Ryde
2003-10-07 15:53 ` Marius Vollmer
2003-10-08 23:03 ` Kevin Ryde
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