GNU bug report logs - #54935
28.1; vc-dir fails with "sort: Wrong type argument: sequencep, t"

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

From: Mike Woolley <mike <at> bulsara.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.1; vc-dir fails with "sort: Wrong type argument: sequencep, t"
Date: Thu, 14 Apr 2022 12:35:54 +0100

New in Emacs 28.1, vc-dir fails on some of my directories with "sort: Wrong type argument: sequencep, t”:

Debugger entered--Lisp error: (wrong-type-argument sequencep t)
  #f(compiled-function (d1 d2) #<bytecode -0xaf17ad190f8dc52>)((Git . "~/") (CVS . t))
  sort(((CVS . t)) #f(compiled-function (d1 d2) #<bytecode -0xaf17ad190f8dc52>))
  vc-responsible-backend("/Users/mike/")
  vc-dir("/Users/mike/" nil)
  funcall-interactively(vc-dir "/Users/mike/" nil)
  call-interactively(vc-dir nil nil)
  command-execute(vc-dir)

It’s going wrong trying to take the _length of t_ in the following code in vc-responsible-backend:

        ;; Just a single response (or none); use it.
        (if (< (length dirs) 2)
            (caar dirs)
          ;; Several roots; we seem to have one vc inside another's
          ;; directory.  Choose the most specific.
          (caar (sort dirs (lambda (d1 d2)
                             (< (length (cdr d2)) (length (cdr d1))))))))

This scenario was working fine in previous versions of Emacs, so looks like recent breakage.

Note that there is a workaround by providing C-u to vc-dir and then manually selecting Git, but clearly it would be better if the problem was fixed.

Thanks,
Mike


In GNU Emacs 28.1 (build 1, x86_64-apple-darwin18.7.0, NS appkit-1671.60 Version 10.14.6 (Build 18G95))
 of 2022-04-04 built on builder10-14.lan
Windowing system distributor 'Apple', version 10.3.2113
System Description:  macOS 12.3.1

Configured using:
 'configure --with-ns '--enable-locallisppath=/Library/Application
 Support/Emacs/${version}/site-lisp:/Library/Application
 Support/Emacs/site-lisp' --with-modules'

Configured features:
ACL GMP GNUTLS JSON LIBXML2 MODULES NOTIFY KQUEUE NS PDUMPER THREADS
TOOLKIT_SCROLL_BARS ZLIB

Important settings:
  value of $LANG: en_GB.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Messages

Minor modes in effect:
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Memory information:
((conses 16 64566 8597)
 (symbols 48 8001 1)
 (strings 32 23981 2059)
 (string-bytes 1 756454)
 (vectors 16 15847)
 (vector-slots 8 211662 14422)
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