I noticed that electric-pair-mode stopped working in rust files.
After a few hours of investigation, I was able to narrow it down to using treesitter with rust-mode-treesitter-derive.

The difficulty was, that it breaks it only after the second emacs start (after a fresh install).

Here is a minimal example to reproduce the issue:

(require 'package) (setq package-archives '(("melpa" . "https://melpa.org/packages/") ("gnu" . "https://elpa.gnu.org/packages/"))) (unless (package-installed-p 'use-package) (package-refresh-contents) (package-install 'use-package)) (require 'use-package) (setq use-package-always-ensure t) (electric-pair-mode 1) ;; this stops working after the second emacs start (use-package rust-mode :hook (rust-mode . lsp-deferred) :init (setq rust-mode-treesitter-derive t) ;; this causes the bug :config (setq rust-format-on-save nil)) (use-package lsp-mode)

My test protocol was:

1. delete .config/emacs/elpa and .config/emacs/eln-cache folder (i didn't delete the .config/emacs/treesitter folder)
2. Save the above init.el in .config/emacs/init.el
3. Open a rust file emacs main.rs
4. Wait for the packages to get installed
5. Write a few brackets in the rust file to ensure electric-pair is working.
6. Close emacs
7. Open the same rust file again
8. Write a few brackets in the rust file. electric-pair is no more working. 🐛

ls ~/.config/emacs/elpa lv-20200507.1518 s-20220902.1511 dash-20240510.1327 ht-20230703.558 markdown-mode-20240829.324 spinner-1.7.4 f-20241003.1131 lsp-mode-20241015.1503 rust-mode-20240903.1233 spinner-1.7.4.signed emacs --version GNU Emacs 29.4

I'm using Kubuntu 24.04