Add auto-highlight-symbol mode

init.el

@@ -1076,10 +1076,19 @@ If no name is given, list all bookmarks instead."
 (mu4e t)
 (mu4e-context-switch nil "Personal")
 
-;; RAINBOW-delimiters
+;; rainbow-delimiters
 (use-package rainbow-delimiters
   :hook (prog-mode . rainbow-delimiters-mode))
 
+;; auto-highlight-symbol
+(use-package auto-highlight-symbol
+  :hook (lisp-data-mode . auto-highlight-symbol-mode)
+  :init
+  (setq ahs-face 'bold
+        ahs-face-unfocused 'bold
+        ahs-plugin-default-face 'bold
+        ahs-plugin-default-face-unfocused 'bold))
+
 ;; Theme (doom-themes)
 (use-package doom-themes
   :config