GNU bug report logs - #80029
30.2; csharp-mode wrong identation for catch...when blocks

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

From: Philippe Vaucher <philippe.vaucher <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 30.2; csharp-mode wrong identation for catch...when blocks
Date: Thu, 18 Dec 2025 15:34:41 +0100

If you try to indent the following in `csharp-mode':

    try
    {
    }
    catch (PipelineStoppedException) when (cancellationToken.IsCancellationRequested)
    {
    }

It displays like this:

    try
    {
    }
    catch (PipelineStoppedException) when (cancellationToken.IsCancellationRequested)
                                     {


In GNU Emacs 30.2 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.41, cairo version 1.18.0) of 2025-09-17 built on
 stvs-pv-laptop-01
Windowing system distributor 'Microsoft Corporation', version 11.0.12010000
System Description: Ubuntu 24.04.3 LTS

Configured using:
 'configure --with-modules --with-sqlite3'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG LCMS2 LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER
PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS WEBP X11 XDBE XIM XINPUT2 XPM GTK3 ZLIB

Important settings:
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Major mode: C#//

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/home/philippe/.emacs.d/straight/build/org/org-cycle hides /usr/local/share/emacs/30.2/lisp/org/org-cycle
/home/philippe/.emacs.d/straight/build/org/ox-texinfo hides /usr/local/share/emacs/30.2/lisp/org/ox-texinfo
/home/philippe/.emacs.d/straight/build/eldoc/eldoc hides /usr/local/share/emacs/30.2/lisp/emacs-lisp/eldoc
/home/philippe/.emacs.d/straight/build/seq/seq hides /usr/local/share/emacs/30.2/lisp/emacs-lisp/seq
/home/philippe/.emacs.d/straight/build/compat/compat hides /usr/local/share/emacs/30.2/lisp/emacs-lisp/compat
/home/philippe/.emacs.d/straight/build/let-alist/let-alist hides /usr/local/share/emacs/30.2/lisp/emacs-lisp/let-alist

Features:
(shadow emacsbug csharp-mode c-ts-common treesit cc-langs cc-mode cc-fonts cc-guess cc-menus cc-cmds tramp trampver
tramp-integration files-x tramp-message tramp-compat xdg tramp-loaddefs emacsql-sqlite-builtin face-remap
evil-collection-forge forge-repos forge-tablist hl-line forge-topics forge-commands forge-semi forge-bitbucket
forge-gogs forge-gitea forge-gitlab forge-github forge-client forge-forgejo forge-notify forge-revnote forge-pullreq
forge-issue forge-discussion forge-topic yaml parse-time iso8601 eieio-custom bug-reference forge-post
evil-collection-markdown-mode markdown-mode evil-collection-outline noutline outline forge-repo forge forge-core
ghub-legacy ghub-graphql treepy gsexp ghub url-http url-gw url-auth forge-db closql emacsql-sqlite emacsql
emacsql-compiler eieio-base magit-bookmark evil-collection-magit magit-submodule magit-blame magit-stash magit-reflog
magit-bisect magit-push magit-pull magit-fetch magit-clone magit-remote magit-commit magit-sequence magit-notes
magit-worktree magit-tag magit-merge magit-branch magit-reset magit-files magit-refs magit-status magit
evil-collection-magit-repos magit-repos magit-apply magit-wip magit-log which-func evil-collection-imenu imenu
magit-diff evil-collection-smerge-mode smerge-mode diff git-commit evil-collection-log-edit log-edit pcvs-util add-log
magit-core magit-autorevert magit-margin magit-transient magit-process evil-collection-with-editor with-editor shell
pcomplete server magit-mode transient browse-url benchmark magit-git magit-base evil-collection-magit-section
magit-section format-spec cursor-sensor crm llama cond-let evil-collection-vc-git vc-git evil-collection-diff-mode
diff-mode track-changes vc-dispatcher backup-each-save evil-collection-go-mode go-mode find-file etags fileloop
generator switch-window switch-window-mvborder switch-window-asciiart quail gnutls network-stream nsm mailalias smtpmail
textsec uni-scripts url url-proxy url-privacy url-expand url-methods url-history idna-mapping ucs-normalize
uni-confusable textsec-check sort help-fns radix-tree cl-print backtrace ispell cape-keyword dabbrev mail-extr message
sendmail mailcap yank-media puny dired-quick-sort hydra lv ls-lisp dired-filter dired-hacks-utils dired-aux dired-x
evil-collection-dired vlf-setup dired dired-loaddefs rfc822 mml mml-sec evil-collection-epa epa derived epg rfc6068
epg-config gnus-util time-date mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045 mm-util ietf-drums
mail-prsvr mailabbrev mail-utils gmm-utils mailheader vertico-directory mule-util vertico-sort minibuf-eldef facemenu
two-column pcase ialign-autoloads hl-todo hl-todo-autoloads crux-autoloads firestarter-autoloads disk-usage-autoloads
benchmark-init-autoloads suggest-autoloads loop-autoloads request-autoloads pkg-info-autoloads epl-autoloads
impatient-mode-autoloads simple-httpd-autoloads htmlize-autoloads hookify-autoloads google-translate-autoloads
chronos-autoloads docker-autoloads tablist-autoloads aio-autoloads evil-collection-atomic-chrome atomic-chrome websocket
url-cookie generate-lisp-file url-domsuf url-util bindat let-alist atomic-chrome-autoloads websocket-autoloads
let-alist-autoloads vterm-autoloads eat-autoloads exec-path-from-shell exec-path-from-shell-autoloads ztree-autoloads
treemacs-autoloads cfrs-autoloads posframe-autoloads pfuture-autoloads ace-window-autoloads avy-autoloads
switch-window-autoloads sr-speedbar-autoloads projectile-rails rake f inflections inf-ruby evil-collection-ruby-mode
ruby-mode smie autoinsert projectile-rails-autoloads rake-autoloads inf-ruby-autoloads inflections-autoloads projectile
evil-collection-grep grep evil-collection-compile compile evil-collection-comint comint ansi-osc ansi-color ibuf-ext
evil-collection-ibuffer ibuffer ibuffer-loaddefs ibuffer-tramp-autoloads goto-last-change-autoloads wgrep-ag-autoloads
wgrep-autoloads bm-autoloads dumb-jump evil-collection-popup popup dash evil-collection-xref xref project
dumb-jump-autoloads neotree-autoloads dirtree-autoloads windata-autoloads tree-mode-autoloads dired-du-autoloads
dired-imenu-autoloads dired-subtree-autoloads dired-ranger-autoloads dired-quick-sort-autoloads hydra-autoloads
dired-filter-autoloads dired-hacks-utils-autoloads ag-autoloads ace-jump-mode-autoloads forge-autoloads yaml-autoloads
ghub-autoloads treepy-autoloads closql-autoloads emacsql-autoloads fullframe fullframe-autoloads
git-timemachine-autoloads git-messenger-autoloads gist-autoloads gh-autoloads marshal-autoloads logito-autoloads
pcache-autoloads litable-autoloads chess-autoloads fireplace-autoloads sunshine-autoloads undo-fu undo-fu-autoloads
evil-goggles pulse evil-goggles-autoloads evil-exchange evil-exchange-autoloads evil-visualstar
evil-visualstar-autoloads evil-matchit evil-matchit-evil-setup evil-matchit-sdk semantic/lex semantic/fw mode-local
find-func evil-matchit-autoloads evil-collection-evil-mc evil-mc evil-mc-command-execute evil-mc-command-record
evil-mc-cursor-make evil-mc-region evil-mc-cursor-state evil-mc-undo evil-mc-vars evil-mc-known-commands evil-mc-common
evil-mc-autoloads evil-numbers evil-numbers-autoloads evil-surround evil-surround-autoloads evil-collection-unimpaired
evil-collection-which-key evil-collection-vertico evil-collection-tabulated-list evil-collection-tab-bar
evil-collection-simple evil-collection-replace evil-collection-process-menu evil-collection-kmacro evil-collection-info
evil-collection-indent evil-collection-help evil-collection-embark evil-collection-elisp-mode evil-collection-eldoc
evil-collection-corfu evil-collection-consult evil-collection-buff-menu evil-collection-bookmark evil-collection
annalist evil-collection-autoloads annalist-autoloads evil evil-integration evil-maps evil-commands reveal evil-jumps
evil-command-window evil-types evil-search evil-ex evil-macros evil-repeat evil-states evil-core evil-common rect
evil-vars evil-autoloads goto-chg-autoloads time autorevert filenotify delsel macrostep-autoloads emr-autoloads
iedit-autoloads clang-format-autoloads projectile-autoloads paredit-autoloads list-utils-autoloads popup-autoloads
elmacro-autoloads vlf-autoloads yasnippet-snippets-autoloads yasnippet-snippets yasnippet yasnippet-autoloads
whitespace-cleanup-mode whitespace whitespace-cleanup-mode-autoloads which-key which-key-autoloads
visual-regexp-steroids-autoloads visual-regexp-autoloads saveplace pretty-symbols-autoloads move-dup move-dup-autoloads
expand-region-autoloads eros-autoloads eimp-autoloads editorconfig editorconfig-core editorconfig-core-handle
editorconfig-fnmatch backup-each-save-autoloads recentf tree-widget wid-edit cape cape-autoloads corfu corfu-autoloads
marginalia marginalia-autoloads consult-dir-autoloads project-autoloads xref-autoloads embark-consult consult bookmark
text-property-search pp embark-consult-autoloads consult-autoloads embark ffap thingatpt url-parse auth-source eieio
eieio-core icons password-cache json map url-vars embark-autoloads vertico vertico-autoloads fussy compat flx
fussy-autoloads flx-autoloads fuz-bin-dyn fuz-bin fuz-bin-autoloads savehist amx s amx-autoloads yaml-mode-autoloads
web-mode-autoloads vimrc-mode-autoloads textile-mode-autoloads slim-mode-autoloads systemd-autoloads scss-mode-autoloads
sass-mode-autoloads rails-log-mode-autoloads rubocop-autoloads enh-ruby-mode-autoloads powershell-autoloads
php-mode-autoloads lsp-mode-autoloads eldoc-autoloads lv-autoloads spinner-autoloads ht-autoloads f-autoloads
elisp-depmap-autoloads dash-autoloads css-eldoc-autoloads less-css-mode-autoloads json-mode-autoloads rx
json-snatcher-autoloads js2-mode-autoloads nsis-mode-autoloads nix-mode-autoloads nginx-mode-autoloads
ini-mode-autoloads haml-mode-autoloads go-mode-autoloads qt-pro-mode-autoloads cc-styles cc-align cc-engine cc-vars
cc-defs dockerfile-mode-autoloads coffee-mode-autoloads cmake-mode-autoloads gptel-autoloads aider-autoloads s-autoloads
markdown-mode-autoloads ai-code-interface-autoloads magit-autoloads with-editor-autoloads magit-section-autoloads
llama-autoloads claude-code-autoloads inheritenv-autoloads transient-autoloads cond-let-autoloads compat-autoloads
seq-autoloads tabbar-autoloads minimap-autoloads fill-column-indicator-autoloads symon-autoloads edmacro kmacro
rainbow-mode-autoloads make-color-autoloads zenity-color-picker-autoloads beacon beacon-autoloads airline-cool-theme
airline-themes powerline byte-opt advice powerline-separators ring color powerline-themes airline-themes-autoloads
powerline-autoloads finder-inf silex-monokai-theme use-package use-package-ensure use-package-delight
use-package-diminish use-package-bind-key bind-key easy-mmode use-package-core use-package-autoloads info
bind-key-autoloads straight-autoloads cl-seq cl-extra help-mode straight subr-x cl-macs gv cl-loaddefs cl-lib bytecomp
byte-compile rmc iso-transl tooltip cconv eldoc paren electric uniquify ediff-hook vc-hooks lisp-float-type elisp-mode
mwheel term/x-win x-win term/common-win x-dnd touch-screen tool-bar dnd fontset image regexp-opt fringe tabulated-list
replace newcomment text-mode lisp-mode prog-mode register page tab-bar menu-bar rfn-eshadow isearch easymenu timer
select scroll-bar mouse jit-lock font-lock syntax font-core term/tty-colors frame minibuffer nadvice seq simple
cl-generic indonesian philippine cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean japanese
eucjp-ms cp51932 hebrew greek romanian slovak czech european ethiopic indian cyrillic chinese composite emoji-zwj
charscript charprop case-table epa-hook jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button loaddefs
theme-loaddefs faces cus-face macroexp files window text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget keymap hashtable-print-readable backquote threads dbusbind inotify lcms2 dynamic-setting
system-font-setting font-render-setting cairo gtk x-toolkit xinput2 x multi-tty move-toolbar make-network-process emacs)

Memory information:
((conses 16 622936 1058613) (symbols 48 41168 1163) (strings 32 153221 72149) (string-bytes 1 4879942)
 (vectors 16 97567) (vector-slots 8 956007 322348) (floats 8 372 8499) (intervals 56 2226 1559) (buffers 984 19))

Message #8 received at 80029 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Philippe Vaucher <philippe.vaucher <at> gmail.com>,
 Theodor Thornhill <theo <at> thornhill.no>,
 Jostein Kjønigsen <jostein <at> kjonigsen.net>
Cc: 80029 <at> debbugs.gnu.org
Subject: Re: bug#80029: 30.2;
 csharp-mode wrong identation for catch...when blocks
Date: Sat, 20 Dec 2025 15:08:04 +0200

> From: Philippe Vaucher <philippe.vaucher <at> gmail.com>
> Date: Thu, 18 Dec 2025 15:34:41 +0100
> 
> 
> If you try to indent the following in `csharp-mode':
> 
>     try
>     {
>     }
>     catch (PipelineStoppedException) when (cancellationToken.IsCancellationRequested)
>     {
>     }
> 
> It displays like this:
> 
>     try
>     {
>     }
>     catch (PipelineStoppedException) when (cancellationToken.IsCancellationRequested)

Thanks.

Theo and Jostein, any ideas or suggestions?

Message #11 received at 80029 <at> debbugs.gnu.org (full text, mbox):

From: Philippe Vaucher <philippe.vaucher <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 80029 <at> debbugs.gnu.org,
 Jostein Kjønigsen <jostein <at> kjonigsen.net>,
 Theodor Thornhill <theo <at> thornhill.no>
Subject: Re: bug#80029: 30.2;
 csharp-mode wrong identation for catch...when blocks
Date: Sat, 20 Dec 2025 15:56:24 +0100

[Message part 1 (text/plain, inline)]

> Theo and Jostein, any ideas or suggestions?


Just to be clear: the position of the curly braces align with the "when"
instead of the "catch".

Kind regards,
Philippe

[Message part 2 (text/html, inline)]

Message #14 received at 80029 <at> debbugs.gnu.org (full text, mbox):

From: Jostein Kjønigsen <jostein <at> secure.kjonigsen.net>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 80029 <at> debbugs.gnu.org,
 Jostein Kjønigsen <jostein <at> kjonigsen.net>,
 Philippe Vaucher <philippe.vaucher <at> gmail.com>,
 Theodor Thornhill <theo <at> thornhill.no>
Subject: Re: bug#80029: 30.2; csharp-mode wrong identation for catch...when
 blocks
Date: Sat, 20 Dec 2025 16:23:35 +0100

[Message part 1 (text/plain, inline)]

> On 20 Dec 2025, at 14:08, Eli Zaretskii <eliz <at> gnu.org> wrote:
> 
>> From: Philippe Vaucher <philippe.vaucher <at> gmail.com>
>> Date: Thu, 18 Dec 2025 15:34:41 +0100
>> 
>> 
>> If you try to indent the following in `csharp-mode':
>> 
>>    try
>>    {
>>    }
>>    catch (PipelineStoppedException) when (cancellationToken.IsCancellationRequested)
>>    {
>>    }
>> 
>> It displays like this:
>> 
>>    try
>>    {
>>    }
>>    catch (PipelineStoppedException) when (cancellationToken.IsCancellationRequested)
> 
> Thanks.
> 
> Theo and Jostein, any ideas or suggestions?

I can reproduce the issue without problems.

It seems to affect both csharp-mode and csharp-ts-mode equally (as in both gets the exact same wrong kind of indentation).

Seeing as this language feature was added waaay back in C# 6.0 (2015), it seems only reasonable Emacs should be able to support it.

I would say the source of this problem is that despite the age/maturity of this feature, we've actually never implemented support for this particular construct in either major-modes (tree-sitter or legacy).

I'm not going to put in effort trying to fix this for csharp-mode, as I really consider it obsolete at this point.

I'll look at csharp-ts-mode though, but i see already from treesit-explore that the grammar here is making things harder to handle than I would have hoped for.

—
Kind Regards
Jostein Kjønigsen

[Message part 2 (text/html, inline)]

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