GNU bug report logs - #70435
30.0.50; cc-mode: <> are sometimes not reconized as parentheses

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Herman Géza <geza.herman <at> gmail.com>, Alan Mackenzie <acm <at> muc.de>
Cc: 70435 <at> debbugs.gnu.org
Subject: bug#70435: 30.0.50; cc-mode: <> are sometimes not reconized as parentheses
Date: Sat, 27 Apr 2024 11:33:38 +0300

> From: Herman <at> debbugs.gnu.org, Géza <geza.herman <at> gmail.com>
> Date: Wed, 17 Apr 2024 12:47:25 +0200
> 
> 
> This is a subtle bug.  In some cases, <> template delimiters are
> not recognized as delimiters, but punctuation characters.
> 
> Repro:
> - put the yasnippet file (included below) into
> <emacs-config-dir>/snippets/c++-mode/something
> - install yasnippet
> - start emacs
> - M-x c++-mode
> - M-x yas-minor-mode
> - load snippets with "M-x yas-reload-all"
> - write "ig", then press TAB to "yas-expand" the snippet
> - move the cursor on the opening "<", and execute "M-x describe-char"
> - notice that it will say "syntax: . which means: punctuation"
> - if you edit the buffer (like add a space somewhere), and execute
> describe-char again, Emacs will say "syntax: > which means: open,
> matches >", so the syntax class becomes correct.
> 
> A possible explanation for this is that yasnippet edits the buffer in a
> way that cc-mode doesn't notices the edit, so it has no chance to put
> the correct syntax info on the inserted characters.
> 
> This is the snippet file (a simple template declaration):
> 
> --8<---------------cut here---------------start------------->8---
> # -*- mode: snippet -*-
> # name: something
> # key: ig
> # --
> template <${1:typename AAA}> struct Foo;
> --8<---------------cut here---------------end--------------->8---

Alan, could you please look into this?

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