; Don't quote nil in comments

lisp/emacs-lisp/subr-x.el

@@ -399,7 +399,7 @@ this defaults to the current buffer."
   "Query the user for a process and return the process object."
   ;; Currently supports only the PROCESS argument.
   ;; Must either return a list containing a process, or signal an error.
-  ;; (Returning `nil' would mean the current buffer's process.)
+  ;; (Returning nil would mean the current buffer's process.)
   (unless (fboundp 'process-list)
     (error "Asynchronous subprocesses are not supported on this system"))
   ;; Local function to return cons of a complete-able name, and the

lisp/external-completion.el

@@ -154,7 +154,7 @@ EXPANDED-PATTERN."
              ;;   very often doesn't equate the full set of candidates
              ;;   (many tools cap to sth like 100-1000 results).
              ;;
-             ;; * when `_method' is `nil' or `lambda' which some
+             ;; * when `_method' is nil or `lambda' which some
              ;;   frontends will invoke.  Here, `all' should be
              ;;   sufficient information for `complete-with-action' to
              ;;   do the job correctly.

lisp/org/ob-clojure.el

@@ -248,8 +248,8 @@ or set the `:backend' header argument"))))
 				"value")))
 		result0)))
       (ob-clojure-string-or-list
-       ;; Filter out s-expressions that return `nil' (string "nil"
-       ;; from nrepl eval) or comment forms (actual `nil' from nrepl)
+       ;; Filter out s-expressions that return nil (string "nil"
+       ;; from nrepl eval) or comment forms (actual nil from nrepl)
        (reverse (delete "" (mapcar (lambda (r)
 				     (replace-regexp-in-string "nil" "" (or r "")))
 				   result0)))))))

lisp/org/org-persist.el

@@ -134,7 +134,7 @@
 ;; from the persistent storage at the end of Emacs session.  The
 ;; expiry condition can be set when saving/registering data
 ;; containers.  The expirty condition can be `never' - data will never
-;; expire; `nil' - data will expire at the end of current Emacs session;
+;; expire; nil - data will expire at the end of current Emacs session;
 ;; a number - data will expire after the number days from last access;
 ;; a function - data will expire if the function, called with a single
 ;; argument - collection, returns non-nil.