From: "Alírio Eyng" <alirioeyng@gmail.com>
To: 17825@debbugs.gnu.org
Subject: bug#17825: broken set! in iteration
Date: Sat, 21 Jun 2014 01:25:56 +0000 [thread overview]
Message-ID: <CALkz57FzmdgSPpsJaELqyxcoHAbYK24Jpp_fdwbL_nUgDp8kUg@mail.gmail.com> (raw)
I can't see why the second code doesn't work like the first:
(use-modules (srfi srfi-1))
(define D '(((3 4))))
(let ((r 1))
(set! D (append D '(())))
(display D)(newline)
(set-car! (drop D r) (car (drop D (- r 1)))))
(let ((r 2))
(set! D (append D '(())))
(display D)(newline)
(set-car! (drop D r) (car (drop D (- r 1)))))
output:
(((3 4)) ())
(((3 4)) ((3 4)) ())
(use-modules (srfi srfi-1))
(define D '(((3 4))))
(map (lambda (r)
(set! D (append D '(())))
(display D)(newline)
(set-car! (drop D r) (car (drop D (- r 1)))))
'(1 2))
output:
(((3 4)) ())
(((3 4)) ((3 4)) ((3 4)))
guile (GNU Guile) 2.0.11
i686-pc-linux-gnu
next reply other threads:[~2014-06-21 1:25 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-21 1:25 Alírio Eyng [this message]
2014-06-21 21:19 ` bug#17825: broken set! in iteration Mark H Weaver
2014-06-21 21:29 ` Mark H Weaver
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