From: Rob Browning <rlb@defaultvalue.org>
To: guile-devel@gnu.org
Subject: [PATCH 1/1] (scheme base) member: return #f, not (), for no match
Date: Sun, 4 Oct 2020 10:50:09 -0500
Message-ID: <20201004155009.184217-1-rlb@defaultvalue.org> (raw)
* module/scheme/base.scm (member): Match the r7rs requirement, as assoc
already does.
Thanks to Erik Dominikus for reporting the problem.
Closes: 43304
---
Proposed for 3.0
module/scheme/base.scm | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/module/scheme/base.scm b/module/scheme/base.scm
index 5a366f846..94591477d 100644
--- a/module/scheme/base.scm
+++ b/module/scheme/base.scm
@@ -129,9 +129,10 @@
(unless (procedure? =)
(error "not a procedure" =))
(let lp ((ls ls))
- (if (or (null? ls) (= (car ls) x))
- ls
- (lp (cdr ls)))))))
+ (cond
+ ((null? ls) #f)
+ ((= (car ls) x) ls)
+ (else (lp (cdr ls))))))))
(define* (assoc x ls #:optional (= equal?))
(cond
--
2.26.1
next reply other threads:[~2020-10-04 15:50 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-04 15:50 Rob Browning [this message]
2020-10-04 16:55 ` Rob Browning
2020-10-04 18:59 ` Rob Browning
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