[Bug 1957156] Re: emacs erlang broken: Error during redisplay: (jit-lock-function 504) signaled (void-function case)

[Andreas Schultz]

In case anyone cares (and I looks like the maintainer does not), backing
out debian/patches/atomsfontlock.patch from the source package fixes the
problem.

Erlang syntax highlighting works as expected after that.

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https://bugs.launchpad.net/bugs/1957156

Title:
  emacs erlang broken: Error during redisplay: (jit-lock-function 504)
  signaled (void-function case)

Status in erlang package in Ubuntu:
  New

Bug description:
  Opening an Erlang source in emacs with erlang-mode renders the file
  with incomplete syntax highlighting. At the same time a error message
  is logged in emacs:

    Error during redisplay: (jit-lock-function 504) signaled (void-
  function case)

  A Lisp backtrace for this:

  Debugger entered--Lisp error: (void-function case)
    (case (nth 3 state) (34 font-lock-string-face) (39 'default))
    (cond ((nth 3 state) (case (nth 3 state) (34 font-lock-string-face) (39 'default))) (t font-lock-comment-face))
    erlang-syntactic-face-function((1 938 nil 34 nil nil 0 nil 939 (938) nil))
    font-lock-fontify-syntactically-region(503 1016 nil)
    font-lock-default-fontify-region(503 1003 nil)
    font-lock-fontify-region(503 1003)
    #f(compiled-function (fun) #<bytecode 0x155ae4b55765>)(font-lock-fontify-region)
    run-hook-wrapped(#f(compiled-function (fun) #<bytecode 0x155ae4b55765>) font-lock-fontify-region)
    jit-lock--run-functions(503 1003)
    jit-lock-fontify-now(503 1003)
    jit-lock-function(503)
    window-end(#<window 9 on ggsn_gn.erl> t)
    linum-update-window(#<window 9 on ggsn_gn.erl>)
    mapc(linum-update-window (#<window 9 on ggsn_gn.erl>))
    linum-update(#<buffer ggsn_gn.erl>)
    linum-after-scroll(#<window 9 on ggsn_gn.erl> 1)
    set-window-buffer(#<window 9 on ggsn_gn.erl> #<buffer ggsn_gn.erl>)
    window--display-buffer(#<buffer ggsn_gn.erl> #<window 9 on ggsn_gn.erl> reuse ((inhibit-same-window)))
    display-buffer-same-window(#<buffer ggsn_gn.erl> ((inhibit-same-window)))
    display-buffer(#<buffer ggsn_gn.erl> (display-buffer-same-window (inhibit-same-window)))
    pop-to-buffer(#<buffer ggsn_gn.erl> (display-buffer-same-window (inhibit-same-window)) nil)
    pop-to-buffer-same-window(#<buffer ggsn_gn.erl>)
    find-file("ggsn_gn.er..." t)
    funcall-interactively(find-file "ggsn_gn.er..." t)
    call-interactively(find-file nil nil)
    command-execute(find-file)

  The backtrace points to the erlang-syntactic-face-function in
  erlang.el. That function is added by a patch that is only present in
  the Debian and Ubuntu packages.

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: erlang-mode 1:24.1.5+dfsg-1ubuntu1
  Uname: Linux 5.15.13-051513-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu75
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: XFCE
  Date: Wed Jan 12 10:30:48 2022
  Dependencies: emacsen-common 3.0.4
  InstallationDate: Installed on 2017-09-26 (1568 days ago)
  InstallationMedia: Ubuntu-Server 17.10 "Artful Aardvark" - Alpha amd64 (20170924)
  PackageArchitecture: all
  SourcePackage: erlang
  UpgradeStatus: Upgraded to jammy on 2021-12-30 (12 days ago)

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