GNU bug report logs - #20512
bogus warning with (format) and ~{ ~}

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Daniel Llorens <daniel.llorens <at> bluewin.ch>
To: bug-guile <at> gnu.org
Subject: bogus warning with (format) and ~{ ~}
Date: Wed, 6 May 2015 11:16:04 +0200

Hello,

this is with current master, I don't know what stable 2.0 does, although I don't think it's changed there.

scheme@(guile-user)> (format #t "~{~{~a~^ ~}\n~}" '((1 2) (3 4)))
;;; <stdin>:1:0: warning: "~{~{~a~^ ~}\\n~}": wrong number of `format' arguments: expected 2, got 1
1 2
3 4
$1 = #t

apparently it only happens with double nesting, e.g. triple nesting is fine:

scheme@(guile-user)> (format #t "~{~{~{~a~^:~}~^ ~}\n~}" '(((1 2) (3 4)) ((5 6) (7 8))))
1:2 3:4
5:6 7:8
$2 = #t

Regards,

	Daniel

Message #8 received at 20512 <at> debbugs.gnu.org (full text, mbox):

From: levenson <at> mmer.org
To: 20512 <at> debbugs.gnu.org
Subject: bug#20512: bogus warning with (format) and ~{ ~}
Date: Mon, 16 Sep 2019 17:06:26 +0200

I encounter similar behavior, but for dynamic padding, but it one case
it doesn't even work. I am using guile 2.2.6 from guix distro

scheme@(guile-user)> (format #f "~:{~v_ ~a ~}" '((5 "hello")))

FORMAT: error with call: (format #f "~:{~v_ ~a ~}<===" ((5 hello)) ===>)
        missing argument(s)
In ice-9/format.scm:
  1590:19  2 (format #f "~:{~v_ ~a ~}" ((5 "hello")))
   197:20  1 (format:format-work "~:{~v_ ~a ~}" (((5 "hello"))))
In unknown file:
           0 (scm-error misc-error #f "~A" ("error in format") #f)
error in format

Added the bogus 0 which doesn't do anything

scheme@(guile-user)> (format #f "~:{~v_ ~a ~}" 0 '((5 "hello")))
;;; <stdin>:3:0: warning: "~:{~v_ ~a ~}": wrong number of `format' arguments: expected 1, got 2
$1 = "      hello "


-- 
Alexey

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