From c59dedcdf17530d22931ec6c8f92215971af09ba Mon Sep 17 00:00:00 2001
From: Stefan Kangas <stefan@marxist.se>
Date: Wed, 31 Mar 2021 18:17:15 +0200
Subject: Use emacs-version instead of obsolete version variables

* lisp/calendar/icalendar.el (icalendar-version):
* lisp/dframe.el (dframe-version):
* lisp/emacs-lisp/checkdoc.el (checkdoc-version):
* lisp/emulation/edt.el (edt-version):
* lisp/international/mule.el (mule-version):
* lisp/linum.el (linum-version):
* lisp/play/bubbles.el (bubbles-version):
* lisp/textmodes/remember.el (remember-version):
* lisp/url/url-vars.el (url-version):
* lisp/woman.el (woman-version): Use emacs-version instead of obsolete
version variables.
---
 lisp/emacs-lisp/checkdoc.el | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

(limited to 'lisp/emacs-lisp')

diff --git a/lisp/emacs-lisp/checkdoc.el b/lisp/emacs-lisp/checkdoc.el
index 62851660c66..96b16f7ed45 100644
--- a/lisp/emacs-lisp/checkdoc.el
+++ b/lisp/emacs-lisp/checkdoc.el
@@ -160,9 +160,6 @@
 ;;     not specifically docstring related.  Would this even be useful?
 
 ;;; Code:
-(defvar checkdoc-version "0.6.2"
-  "Release version of checkdoc you are currently running.")
-(make-obsolete-variable 'checkdoc-version nil "28.1")
 
 (require 'cl-lib)
 (require 'help-mode) ;; for help-xref-info-regexp
@@ -2709,6 +2706,12 @@ function called to create the messages."
 
 (custom-add-option 'emacs-lisp-mode-hook 'checkdoc-minor-mode)
 
+;; Obsolete
+
+(defvar checkdoc-version "0.6.2"
+  "Release version of checkdoc you are currently running.")
+(make-obsolete-variable 'checkdoc-version 'emacs-version "28.1")
+
 (provide 'checkdoc)
 
 ;;; checkdoc.el ends here
-- 
cgit v1.2.3


From cd5dfa086d204c01791bfdcdf9fe1215c4bf1e42 Mon Sep 17 00:00:00 2001
From: Stefan Kangas <stefan@marxist.se>
Date: Sat, 3 Apr 2021 01:21:32 +0200
Subject: Replace two functions with seq-subseq

* lisp/emacs-lisp/seq.el (seq-subseq): Add autoload cookie.
* lisp/eshell/esh-util.el (eshell-sublist): Redefine using seq-subseq
and make obsolete.  Update callers.
* lisp/wid-edit.el (widget-sublist): Redefine as obsolete function
alias for seq-subseq.  Update callers.
---
 lisp/emacs-lisp/seq.el  |  1 +
 lisp/eshell/em-hist.el  |  2 +-
 lisp/eshell/esh-util.el | 20 ++++++++------------
 lisp/wid-edit.el        | 19 +++++--------------
 4 files changed, 15 insertions(+), 27 deletions(-)

(limited to 'lisp/emacs-lisp')

diff --git a/lisp/emacs-lisp/seq.el b/lisp/emacs-lisp/seq.el
index 2b8807faad5..f2f7d677e88 100644
--- a/lisp/emacs-lisp/seq.el
+++ b/lisp/emacs-lisp/seq.el
@@ -147,6 +147,7 @@ the sequence, and its index within the sequence."
   "Return a shallow copy of SEQUENCE."
   (copy-sequence sequence))
 
+;;;###autoload
 (cl-defgeneric seq-subseq (sequence start &optional end)
   "Return the sequence of elements of SEQUENCE from START to END.
 END is exclusive.
diff --git a/lisp/eshell/em-hist.el b/lisp/eshell/em-hist.el
index b7b1778ebb1..e559f5b39fe 100644
--- a/lisp/eshell/em-hist.el
+++ b/lisp/eshell/em-hist.el
@@ -758,7 +758,7 @@ matched."
 	(setq nth (eshell-hist-word-reference nth)))
       (unless (numberp mth)
 	(setq mth (eshell-hist-word-reference mth)))
-      (cons (mapconcat #'identity (eshell-sublist textargs nth mth) " ")
+      (cons (mapconcat #'identity (seq-subseq textargs nth (1+ mth)) " ")
 	    end))))
 
 (defun eshell-hist-parse-modifier (hist reference)
diff --git a/lisp/eshell/esh-util.el b/lisp/eshell/esh-util.el
index 8ef1ac9c345..1dcbed3d961 100644
--- a/lisp/eshell/esh-util.el
+++ b/lisp/eshell/esh-util.el
@@ -223,18 +223,6 @@ then quoting is done by a backslash, rather than a doubled delimiter."
 	      (string-to-number string)
 	    string))))))
 
-(defun eshell-sublist (l &optional n m)
-  "Return from LIST the N to M elements.
-If N or M is nil, it means the end of the list."
-  (let ((a (copy-sequence l)))
-    (if (and m (consp (nthcdr m a)))
-	(setcdr (nthcdr m a) nil))
-    (if n
-	(setq a (nthcdr n a))
-      (setq n (1- (length a))
-	    a (last a)))
-    a))
-
 (defvar-local eshell-path-env (getenv "PATH")
   "Content of $PATH.
 It might be different from \(getenv \"PATH\"), when
@@ -710,9 +698,17 @@ gid format.  Valid values are `string' and `integer', defaulting to
 ;     (or result
 ;	(file-attributes filename))))
 
+;; Obsolete.
+
 (define-obsolete-function-alias 'eshell-copy-tree #'copy-tree "28.1")
 (define-obsolete-function-alias 'eshell-user-name #'user-login-name "28.1")
 
+(defun eshell-sublist (l &optional n m)
+  "Return from LIST the N to M elements.
+If N or M is nil, it means the end of the list."
+  (declare (obsolete seq-subseq "28.1"))
+  (seq-subseq l n (1+ m)))
+
 (provide 'esh-util)
 
 ;;; esh-util.el ends here
diff --git a/lisp/wid-edit.el b/lisp/wid-edit.el
index e71290c7ef9..51c6b49e6df 100644
--- a/lisp/wid-edit.el
+++ b/lisp/wid-edit.el
@@ -1878,20 +1878,9 @@ as the argument to `documentation-property'."
   (let ((value (widget-get widget :value)))
     (and (listp value)
 	 (<= (length value) (length vals))
-	 (let ((head (widget-sublist vals 0 (length value))))
+         (let ((head (seq-subseq vals 0 (length value))))
 	   (and (equal head value)
-		(cons head (widget-sublist vals (length value))))))))
-
-(defun widget-sublist (list start &optional end)
-  "Return the sublist of LIST from START to END.
-If END is omitted, it defaults to the length of LIST."
-  (if (> start 0) (setq list (nthcdr start list)))
-  (if end
-      (unless (<= end start)
-	(setq list (copy-sequence list))
-	(setcdr (nthcdr (- end start 1) list) nil)
-	list)
-    (copy-sequence list)))
+                (cons head (seq-subseq vals (length value))))))))
 
 (defun widget-item-action (widget &optional event)
   ;; Just notify itself.
@@ -4117,7 +4106,9 @@ is inline."
 	(setq help-echo (funcall help-echo widget)))
     (if help-echo (message "%s" (eval help-echo)))))
 
-;;; The End:
+;;; Obsolete.
+
+(define-obsolete-function-alias 'widget-sublist #'seq-subseq "28.1")
 
 (provide 'wid-edit)
 
-- 
cgit v1.2.3


From 20f7fa691b7c2859b96550d9ccb326bf394e160d Mon Sep 17 00:00:00 2001
From: Stefan Kangas <stefan@marxist.se>
Date: Mon, 5 Apr 2021 14:24:00 +0200
Subject: Obsolete local set difference functions in favor of seq-difference

* lisp/emacs-lisp/seq.el (seq-difference): Add autoload cookie.
* lisp/gnus/gnus-range.el (gnus-set-difference):
* lisp/gnus/spam.el (spam-set-difference): Make obsolete in favor
of seq-difference.  Update callers.
---
 lisp/emacs-lisp/seq.el  |  1 +
 lisp/gnus/gnus-cite.el  |  4 ++--
 lisp/gnus/gnus-range.el |  9 ++-------
 lisp/gnus/gnus-sum.el   |  5 +++--
 lisp/gnus/gnus-uu.el    |  2 +-
 lisp/gnus/nnimap.el     | 10 ++++++----
 lisp/gnus/spam.el       | 14 +++-----------
 7 files changed, 18 insertions(+), 27 deletions(-)

(limited to 'lisp/emacs-lisp')

diff --git a/lisp/emacs-lisp/seq.el b/lisp/emacs-lisp/seq.el
index f2f7d677e88..7aa5684cfd1 100644
--- a/lisp/emacs-lisp/seq.el
+++ b/lisp/emacs-lisp/seq.el
@@ -468,6 +468,7 @@ Equality is defined by TESTFN if non-nil or by `equal' if nil."
               (seq-reverse sequence1)
               '()))
 
+;;;###autoload
 (cl-defgeneric seq-difference (sequence1 sequence2 &optional testfn)
   "Return a list of the elements that appear in SEQUENCE1 but not in SEQUENCE2.
 Equality is defined by TESTFN if non-nil or by `equal' if nil."
diff --git a/lisp/gnus/gnus-cite.el b/lisp/gnus/gnus-cite.el
index 1f564f192b0..4249b50b9ff 100644
--- a/lisp/gnus/gnus-cite.el
+++ b/lisp/gnus/gnus-cite.el
@@ -839,7 +839,7 @@ See also the documentation for `gnus-article-highlight-citation'."
 		 (setq current (car loop)
 		       loop (cdr loop))
 		 (setcdr current
-			 (gnus-set-difference (cdr current) numbers)))))))))
+                         (seq-difference (cdr current) numbers #'eq)))))))))
 
 (defun gnus-cite-parse-attributions ()
   (let (al-alist)
@@ -999,7 +999,7 @@ See also the documentation for `gnus-article-highlight-citation'."
 		    loop (cdr loop))
 	      (if (eq current best)
 		  ()
-		(setcdr current (gnus-set-difference (cdr current) numbers))
+                (setcdr current (seq-difference (cdr current) numbers #'eq))
 		(when (null (cdr current))
 		  (setq gnus-cite-loose-prefix-alist
 			(delq current gnus-cite-loose-prefix-alist)
diff --git a/lisp/gnus/gnus-range.el b/lisp/gnus/gnus-range.el
index 456209f3d9a..7d12ae9fdcc 100644
--- a/lisp/gnus/gnus-range.el
+++ b/lisp/gnus/gnus-range.el
@@ -42,13 +42,8 @@ If RANGE is a single range, return (RANGE).  Otherwise, return RANGE."
 
 (defun gnus-set-difference (list1 list2)
   "Return a list of elements of LIST1 that do not appear in LIST2."
-  (let ((hash2 (make-hash-table :test 'eq))
-        (result nil))
-    (dolist (elt list2) (puthash elt t hash2))
-    (dolist (elt list1)
-      (unless (gethash elt hash2)
-        (setq result (cons elt result))))
-    (nreverse result)))
+  (declare (obsolete seq-difference "28.1"))
+  (seq-difference list1 list2 #'eq))
 
 (defun gnus-range-nconcat (&rest ranges)
   "Return a range comprising all the RANGES, which are pre-sorted.
diff --git a/lisp/gnus/gnus-sum.el b/lisp/gnus/gnus-sum.el
index ac9317ef4e2..eeb5ac851ae 100644
--- a/lisp/gnus/gnus-sum.el
+++ b/lisp/gnus/gnus-sum.el
@@ -8569,8 +8569,9 @@ If UNREPLIED (the prefix), limit to unreplied articles."
   (interactive "P" gnus-summary-mode)
   (if unreplied
       (gnus-summary-limit
-       (gnus-set-difference gnus-newsgroup-articles
-	gnus-newsgroup-replied))
+       (seq-difference gnus-newsgroup-articles
+                       gnus-newsgroup-replied
+                       #'eq))
     (gnus-summary-limit gnus-newsgroup-replied))
   (gnus-summary-position-point))
 
diff --git a/lisp/gnus/gnus-uu.el b/lisp/gnus/gnus-uu.el
index 5cbe8495d31..ceb2ebcdcb1 100644
--- a/lisp/gnus/gnus-uu.el
+++ b/lisp/gnus/gnus-uu.el
@@ -579,7 +579,7 @@ didn't work, and overwrite existing files.  Otherwise, ask each time."
 (defun gnus-new-processable (unmarkp articles)
   (if unmarkp
       (nreverse (seq-intersection gnus-newsgroup-processable articles #'eq))
-    (gnus-set-difference articles gnus-newsgroup-processable)))
+    (seq-difference articles gnus-newsgroup-processable #'eq)))
 
 (defun gnus-uu-mark-by-regexp (regexp &optional unmark)
   "Set the process mark on articles whose subjects match REGEXP.
diff --git a/lisp/gnus/nnimap.el b/lisp/gnus/nnimap.el
index f06959f65d9..8990b2bebeb 100644
--- a/lisp/gnus/nnimap.el
+++ b/lisp/gnus/nnimap.el
@@ -1614,13 +1614,15 @@ If LIMIT, first try to limit the search to the N last articles."
 	      (setq start-article 1))
 	    (let* ((unread
 		    (gnus-compress-sequence
-		     (gnus-set-difference
-		      (gnus-set-difference
+                     (seq-difference
+                      (seq-difference
 		       existing
 		       (gnus-sorted-union
 			(cdr (assoc '%Seen flags))
-			(cdr (assoc '%Deleted flags))))
-		      (cdr (assoc '%Flagged flags)))))
+                        (cdr (assoc '%Deleted flags)))
+                       #'eq)
+                      (cdr (assoc '%Flagged flags))
+                      #'eq)))
 		   (read (gnus-range-difference
 			  (cons start-article high) unread)))
 	      (when (> start-article 1)
diff --git a/lisp/gnus/spam.el b/lisp/gnus/spam.el
index d00f0a60b66..3f978918b9a 100644
--- a/lisp/gnus/spam.el
+++ b/lisp/gnus/spam.el
@@ -710,16 +710,8 @@ finds ham or spam.")
 (defun spam-set-difference (list1 list2)
   "Return a set difference of LIST1 and LIST2.
 When either list is nil, the other is returned."
-  (if (and list1 list2)
-      ;; we have two non-nil lists
-      (progn
-        (dolist (item (append list1 list2))
-          (when (and (memq item list1) (memq item list2))
-            (setq list1 (delq item list1))
-            (setq list2 (delq item list2))))
-        (append list1 list2))
-    ;; if either of the lists was nil, return the other one
-    (if list1 list1 list2)))
+  (declare (obsolete seq-difference "28.1"))
+  (seq-difference list1 list2 #'eq))
 
 (defun spam-group-ham-mark-p (group mark &optional spam)
   "Checks if MARK is considered a ham mark in GROUP."
@@ -1327,7 +1319,7 @@ In the case of mover backends, checks the setting of
              (new-articles (spam-list-articles
                             gnus-newsgroup-articles
                             classification))
-             (changed-articles (spam-set-difference new-articles old-articles)))
+             (changed-articles (seq-difference new-articles old-articles #'eq)))
         ;; now that we have the changed articles, we go through the processors
         (dolist (backend (spam-backend-list))
           (let (unregister-list)
-- 
cgit v1.2.3


From 6686a31591d2d22a4d1c7b6e68a618823186c48e Mon Sep 17 00:00:00 2001
From: Stefan Kangas <stefan@marxist.se>
Date: Mon, 5 Apr 2021 15:14:19 +0200
Subject: Remove local uniquify functions in favour of seq-uniq

* lisp/emacs-lisp/seq.el (seq-uniq): Add autoload cookie.
* lisp/pcomplete.el: (pcomplete-uniquify-list): Use seq-uniq.
* lisp/eshell/esh-util.el (eshell-uniqify-list)
(eshell-uniquify-list):
* lisp/nxml/rng-util.el (rng-uniquify-equal):
* lisp/progmodes/idlwave.el (idlwave-uniquify):
* lisp/textmodes/artist.el (artist-uniq): Make into obsolete
function aliases for seq-uniq.  Update callers.
* lisp/nxml/rng-util.el (rng-uniquify-eq): Make obsolete in favor
of seq-uniq.  Update callers.
---
 lisp/emacs-lisp/seq.el    |  1 +
 lisp/eshell/em-pred.el    |  2 +-
 lisp/eshell/esh-util.el   | 16 ++--------------
 lisp/nxml/rng-loc.el      |  2 +-
 lisp/nxml/rng-match.el    |  2 +-
 lisp/nxml/rng-nxml.el     |  2 +-
 lisp/nxml/rng-util.el     | 28 ++++++++--------------------
 lisp/pcomplete.el         | 15 +++------------
 lisp/progmodes/idlwave.el | 12 +++---------
 lisp/textmodes/artist.el  | 14 ++------------
 10 files changed, 23 insertions(+), 71 deletions(-)

(limited to 'lisp/emacs-lisp')

diff --git a/lisp/emacs-lisp/seq.el b/lisp/emacs-lisp/seq.el
index 7aa5684cfd1..6c15463ad52 100644
--- a/lisp/emacs-lisp/seq.el
+++ b/lisp/emacs-lisp/seq.el
@@ -431,6 +431,7 @@ Equality is defined by TESTFN if non-nil or by `equal' if nil."
         (setq index (1+ index)))
       nil)))
 
+;;;###autoload
 (cl-defgeneric seq-uniq (sequence &optional testfn)
   "Return a list of the elements of SEQUENCE with duplicates removed.
 TESTFN is used to compare elements, or `equal' if TESTFN is nil."
diff --git a/lisp/eshell/em-pred.el b/lisp/eshell/em-pred.el
index b0a7544bdab..0780d6ee83a 100644
--- a/lisp/eshell/em-pred.el
+++ b/lisp/eshell/em-pred.el
@@ -130,7 +130,7 @@ The format of each entry is
     (?e . (lambda (lst) (mapcar #'file-name-extension lst)))
     (?t . (lambda (lst) (mapcar #'file-name-nondirectory lst)))
     (?q . (lambda (lst) (mapcar #'eshell-escape-arg lst)))
-    (?u . (lambda (lst) (eshell-uniquify-list lst)))
+    (?u . (lambda (lst) (seq-uniq lst)))
     (?o . (lambda (lst) (sort lst #'string-lessp)))
     (?O . (lambda (lst) (nreverse (sort lst #'string-lessp))))
     (?j . (eshell-join-members))
diff --git a/lisp/eshell/esh-util.el b/lisp/eshell/esh-util.el
index 1dcbed3d961..a48f62654d5 100644
--- a/lisp/eshell/esh-util.el
+++ b/lisp/eshell/esh-util.el
@@ -291,20 +291,6 @@ Prepend remote identification of `default-directory', if any."
 
 (define-obsolete-function-alias 'eshell-flatten-list #'flatten-tree "27.1")
 
-(defun eshell-uniquify-list (l)
-  "Remove occurring multiples in L.  You probably want to sort first."
-  (let ((m l))
-    (while m
-      (while (and (cdr m)
-		  (string= (car m)
-			   (cadr m)))
-	(setcdr m (cddr m)))
-      (setq m (cdr m))))
-  l)
-(define-obsolete-function-alias
-  'eshell-uniqify-list
-  'eshell-uniquify-list "27.1")
-
 (defun eshell-stringify (object)
   "Convert OBJECT into a string value."
   (cond
@@ -700,6 +686,8 @@ gid format.  Valid values are `string' and `integer', defaulting to
 
 ;; Obsolete.
 
+(define-obsolete-function-alias 'eshell-uniquify-list #'seq-uniq "28.1")
+(define-obsolete-function-alias 'eshell-uniqify-list #'seq-uniq "28.1")
 (define-obsolete-function-alias 'eshell-copy-tree #'copy-tree "28.1")
 (define-obsolete-function-alias 'eshell-user-name #'user-login-name "28.1")
 
diff --git a/lisp/nxml/rng-loc.el b/lisp/nxml/rng-loc.el
index d5a608d6ff2..a38da794226 100644
--- a/lisp/nxml/rng-loc.el
+++ b/lisp/nxml/rng-loc.el
@@ -182,7 +182,7 @@ If TYPE-ID is non-nil, then locate the schema for this TYPE-ID."
     (while files
       (setq type-ids (rng-possible-type-ids-using (car files) type-ids))
       (setq files (cdr files)))
-    (rng-uniquify-equal (sort type-ids 'string<))))
+    (seq-uniq (sort type-ids 'string<))))
 
 (defun rng-locate-schema-file-using (files)
   "Locate a schema using the schema locating files FILES.
diff --git a/lisp/nxml/rng-match.el b/lisp/nxml/rng-match.el
index 4fc6727d0e6..7a2739c0616 100644
--- a/lisp/nxml/rng-match.el
+++ b/lisp/nxml/rng-match.el
@@ -472,7 +472,7 @@ list is nullable and whose cdr is the normalized list."
     (cons nullable
 	  (if sorted
 	      head
-	    (rng-uniquify-eq (sort head 'rng-compare-ipattern))))))
+            (seq-uniq (sort head 'rng-compare-ipattern) #'eq)))))
 
 (defun rng-compare-ipattern (p1 p2)
   (< (rng--ipattern-index p1)
diff --git a/lisp/nxml/rng-nxml.el b/lisp/nxml/rng-nxml.el
index 7ea6fb2e49d..33768a46c94 100644
--- a/lisp/nxml/rng-nxml.el
+++ b/lisp/nxml/rng-nxml.el
@@ -522,7 +522,7 @@ set `xmltok-dtd'.  Returns the position of the end of the token."
 	  (unless attribute-flag
 	    (setcdr ns-prefixes (cons nil (cdr ns-prefixes))))))
       (setq iter (cdr iter)))
-    (rng-uniquify-equal
+    (seq-uniq
      (sort (apply #'append
 		  (cons extra-strings
 			(mapcar (lambda (name)
diff --git a/lisp/nxml/rng-util.el b/lisp/nxml/rng-util.el
index a20e95086cb..67e2ee9f1e3 100644
--- a/lisp/nxml/rng-util.el
+++ b/lisp/nxml/rng-util.el
@@ -36,26 +36,6 @@
 
 (defconst rng-builtin-datatypes-uri (rng-make-datatypes-uri ""))
 
-(defun rng-uniquify-eq (list)
-  "Destructively remove `eq' duplicates from LIST."
-  (and list
-       (let ((head list))
-	 (while (cdr head)
-	   (if (eq (car head) (cadr head))
-	       (setcdr head (cddr head)))
-	   (setq head (cdr head)))
-	 list)))
-
-(defun rng-uniquify-equal (list)
-  "Destructively remove `equal' duplicates from LIST."
-  (and list
-       (let ((head list))
-	 (while (cdr head)
-	   (if (equal (car head) (cadr head))
-	       (setcdr head (cddr head)))
-	   (setq head (cdr head)))
-	 list)))
-
 (defun rng-blank-p (str) (string-match "\\`[ \t\n\r]*\\'" str))
 
 (defun rng-substq (new old list)
@@ -104,6 +84,14 @@ LIST is not modified."
 
 (define-error 'rng-error nil)
 
+;; Obsolete.
+
+(defun rng-uniquify-eq (list)
+  (declare (obsolete seq-uniq "28.1"))
+  (seq-uniq list #'eq))
+
+(define-obsolete-function-alias 'rng-uniquify-equal #'seq-uniq "28.1")
+
 (provide 'rng-util)
 
 ;;; rng-util.el ends here
diff --git a/lisp/pcomplete.el b/lisp/pcomplete.el
index b648ecf0986..bffdcaa2de0 100644
--- a/lisp/pcomplete.el
+++ b/lisp/pcomplete.el
@@ -1260,18 +1260,9 @@ If specific documentation can't be given, be generic."
 
 (defun pcomplete-uniquify-list (l)
   "Sort and remove multiples in L."
-  (setq l (sort l 'string-lessp))
-  (let ((m l))
-    (while m
-      (while (and (cdr m)
-		  (string= (car m)
-			   (cadr m)))
-	(setcdr m (cddr m)))
-      (setq m (cdr m))))
-  l)
-(define-obsolete-function-alias
-  'pcomplete-uniqify-list
-  'pcomplete-uniquify-list "27.1")
+  (setq l (sort l #'string-lessp))
+  (seq-uniq l))
+(define-obsolete-function-alias 'pcomplete-uniqify-list #'pcomplete-uniquify-list "27.1")
 
 (defun pcomplete-process-result (cmd &rest args)
   "Call CMD using `call-process' and return the simplest result."
diff --git a/lisp/progmodes/idlwave.el b/lisp/progmodes/idlwave.el
index f53f3f3b995..75f2016fc24 100644
--- a/lisp/progmodes/idlwave.el
+++ b/lisp/progmodes/idlwave.el
@@ -7601,15 +7601,6 @@ associated TAG, if any."
           (put-text-property (match-beginning 0) (match-end 0)
                              'face 'font-lock-string-face))))))
 
-(defun idlwave-uniquify (list)
-  (let ((ht (make-hash-table :size (length list) :test 'equal)))
-    (delq nil
-	  (mapcar (lambda (x)
-		    (unless (gethash x ht)
-		      (puthash x t ht)
-		      x))
-		  list))))
-
 (defun idlwave-after-successful-completion (type slash &optional verify)
   "Add `=' or `(' after successful completion of keyword and function.
 Restore the pre-completion window configuration if possible."
@@ -9101,6 +9092,9 @@ This function was written since `list-abbrevs' looks terrible for IDLWAVE mode."
 ;; Run the hook
 (run-hooks 'idlwave-load-hook)
 
+;; Obsolete.
+(define-obsolete-function-alias 'idlwave-uniquify #'seq-uniq "28.1")
+
 (provide 'idlwave)
 
 ;;; idlwave.el ends here
diff --git a/lisp/textmodes/artist.el b/lisp/textmodes/artist.el
index 22ade15921d..fbb9d2174fd 100644
--- a/lisp/textmodes/artist.el
+++ b/lisp/textmodes/artist.el
@@ -1753,13 +1753,6 @@ info-variant-part."
   "Call function FN with ARGS, if FN is not nil."
   `(if ,fn (funcall ,fn ,@args)))
 
-(defun artist-uniq (l)
-  "Remove consecutive duplicates in list L.  Comparison is done with `equal'."
-  (cond ((null l) nil)
-	((null (cdr l)) l)		; only one element in list
-	((equal (car l) (car (cdr l))) (artist-uniq (cdr l))) ; first 2 equal
-	(t (cons (car l) (artist-uniq (cdr l)))))) ; first 2 are different
-
 (defun artist-string-split (str r)
   "Split string STR at occurrences of regexp R, returning a list of strings."
   (let ((res nil)
@@ -2761,7 +2754,7 @@ to append to the end of the list, when doing free-hand drawing)."
 Also, the `artist-key-poly-point-list' is reversed."
 
   (setq artist-key-poly-point-list
-	(artist-uniq artist-key-poly-point-list))
+        (seq-uniq artist-key-poly-point-list))
 
   (if (>= (length artist-key-poly-point-list) 2)
 
@@ -5372,10 +5365,7 @@ The event, EV, is the mouse event."
 	 (concat "Hello Tomas,\n\n"
 		 "I have a nice bug report on Artist for you! Here it is:")))))
 
-
-;;
-;; Now provide this minor mode
-;;
+(define-obsolete-function-alias 'artist-uniq #'seq-uniq "28.1")
 
 (provide 'artist)
 
-- 
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