bug#41745: 28.0.50; problem with json file and which-function on pretest an master

[Andrés Ramírez]

Hi.

I have an issue after opening a json file with pretest.  Going to end of file 
with M-> then M-x backward-delete-char. I get
this:

--8<---------------cut here---------------start------------->8---
Debugger entered--Lisp error: (cl-assertion-failed ((or (= (point-min) 
(point-max)) (eq js--last-parse-pos (point))) nil))
  cl--assertion-failed((or (= (point-min) (point-max)) (eq js--last-parse-pos 
(point))))
  js--imenu-create-index()
  imenu--make-index-alist(t)
  which-function()
  which-func-update-1(#<window 3 on sale_line_grammar.json>)
  which-func-update()
  apply(which-func-update nil)
  timer-event-handler([t 0 0 500000 t which-func-update nil idle 0])
--8<---------------cut here---------------end--------------->8---

I have tried to do the same with emacs -Q (But. I was not able of
reproducing it).

Also I have tested the same with emacs26.3. And everything works ok.

So my personal conclusion is that this is a regression (related to 
which-func.el).

So. I have not been able of reproducing it with emacs -Q. If needed I
could share my dot emacs files.

Just in Case this is the content of the file that causes the issue:

--8<---------------cut here---------------start------------->8---
//  TODO: code the #else; analize  it {before document better the keywords}
#if ( ${saleline.is_service()} == 0 )
${saleline.supplier()}/${saleline.subcategory()}/${saleline.color()}/${saleline.size()}/${saleline.name()}/${saleline.unit()}
#end
#if ( ${saleline.is_service()} == "1" )
${saleline.supplier()}/${saleline.subcategory()}/${saleline.name()}
#end
--8<---------------cut here---------------end--------------->8---

Best Regards



In GNU Emacs 28.0.50 (build 2, armv7l-unknown-linux-gnueabihf, GTK+ Version 
3.24.20, cairo version 1.17.3)
Repository revision: a69ef94e22716f9cbb7cf8d78b89e7be4a4c60eb
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Arch Linux ARM

Recent messages:
Loading /home/olla/.emacs.d/init.el (source)...done
Loading /home/olla/.emacs.d/elpa/god-mode/god-mode.el (source)...done
Loading /home/olla/.emacs.d/elpa/avy/avy.el (source)...done
Loading /home/olla/.emacs.d/elpa/ace-window/ace-window.el (source)...done
Loading /home/olla/.emacs.d/my-noexternals.el (source)...
Created wl link.
loading my-noexternal not dot file
restoring gc-cons-threshold after startup
Loading /home/olla/.emacs.d/my-noexternals.el (source)...done
Package cl is deprecated

Configured using:
 'configure '--program-transform-name=s/^ctags$/ctags.emacs/'
 --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/usr/share --with-x-toolkit=gtk --mandir=/usr/share/man
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 CPPFLAGS=-D_FORTIFY_SOURCE=2
 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'

Configured features:
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INOTIFY ACL GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS LIBSYSTEMD JSON
PDUMPER LCMS2 GMP

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

Major mode: Lisp Interaction

Minor modes in effect:
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  which-function-mode: t
  savehist-mode: t
  show-paren-mode: t
  erc-track-mode: t
  erc-match-mode: t
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  electric-indent-mode: t
  mouse-wheel-mode: t
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  auto-composition-mode: t
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  column-number-mode: t
  line-number-mode: t

Load-path shadows:
None found.

Features:
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x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 8 194069 156217)
 (symbols 24 20498 1)
 (strings 16 63580 8303)
 (string-bytes 1 2150082)
 (vectors 8 27826)
 (vector-slots 4 327386 154564)
 (floats 8 101 627)
 (intervals 28 316 0)
 (buffers 576 10))