* lisp/gnus/gnus.el (gnus-info): Define with `cl-defstruct`

This makes the accessors into (inlined) functions (instead of macros),
which simplifies some uses, and it makes the gnus-info-set-<foo>
macros redundant since we can use `setf` instead.  Remove them and
update all users.

(gnus-info-group, gnus-info-rank, gnus-info-read, gnus-info-marks)
(gnus-info-method, gnus-info-params): Auto-defined by defstruct.
(gnus-info-level, gnus-info-score): Define as a function.  Add gv-setter.
(gnus-info-set-group, gnus-info-set-rank, gnus-info-set-read): Remove,
use `setf` instead.
(gnus-info-set-marks, gnus-info-set-method, gnus-info-set-params):
Define as a function.
(gnus-info-set-entry): Delete function.
(gnus-info--grow-entry): New function, extracted from it.
(gnus-info--set-level, gnus-info--set-score): New functions, extracted
from the `gnus-info-set-level` and `gnus-info-set-score` which they replace.
(gnus-get-info): Define as a function.

* lisp/gnus/gnus-group.el (gnus-group-edit-group-done):
Use the `extend` arg of `gnus-info-set-method`.
(gnus-group-sort-selected-flat): eta-reduce.

15 files changed, 148 insertions, 176 deletions

diff --git a/lisp/gnus/gnus-agent.el b/lisp/gnus/gnus-agent.el
index 1f252552784..afe1997378d 100644
--- a/lisp/gnus/gnus-agent.el
+++ b/lisp/gnus/gnus-agent.el
@@ -1212,26 +1212,24 @@ This can be added to `gnus-select-article-hook' or
 	      (marks (nth 2 action)))
 	  (dolist (mark marks)
 	    (cond ((eq mark 'read)
-		   (gnus-info-set-read
-		    info
-		    (funcall (if (eq what 'add)
-				 'gnus-range-add
-			       'gnus-remove-from-range)
-			     (gnus-info-read info)
-			     range))
+		   (setf (gnus-info-read info)
+			 (funcall (if (eq what 'add)
+				      #'gnus-range-add
+				    #'gnus-remove-from-range)
+				  (gnus-info-read info)
+				  range))
 		   (gnus-get-unread-articles-in-group
 		    info
 		    (gnus-active (gnus-info-group info))))
 		  ((memq mark '(tick))
 		   (let ((info-marks (assoc mark (gnus-info-marks info))))
 		     (unless info-marks
-                       (gnus-info-set-marks
-                        info (cons (setq info-marks (list mark))
-                                   (gnus-info-marks info))))
+                       (push (setq info-marks (list mark))
+                             (gnus-info-marks info)))
                      (setcdr info-marks
                              (funcall (if (eq what 'add)
-                                          'gnus-range-add
-                                        'gnus-remove-from-range)
+                                          #'gnus-range-add
+                                        #'gnus-remove-from-range)
                                       (cdr info-marks)
                                       range))))))))
 
@@ -1303,12 +1301,11 @@ downloaded into the agent."
           ;; file.
 
           (let ((read (gnus-info-read info)))
-            (gnus-info-set-read
-             info
-             (gnus-range-add
-              read
-              (list (cons (1+ agent-max)
-                          (1- active-min))))))
+            (setf (gnus-info-read info)
+                  (gnus-range-add
+                   read
+                   (list (cons (1+ agent-max)
+                               (1- active-min))))))
 
           ;; Lie about the agent's local range for this group to
           ;; disable the set read each time this server is opened.
@@ -2533,13 +2530,14 @@ modified) original contents, they are first saved to their own file."
 			       (assq mark (gnus-info-marks
 					   (setq info (gnus-get-info group))))))
                           (when (cdr marked-arts)
+                            ;; FIXME: Use `cl-callf'?
                             (setq marks
 				  (delq marked-arts (gnus-info-marks info)))
-                            (gnus-info-set-marks info marks)))))
+                            (setf (gnus-info-marks info) marks)))))
                     (let ((read (gnus-info-read
 				 (or info (setq info (gnus-get-info group))))))
-                      (gnus-info-set-read
-		       info (gnus-add-to-range read unfetched-articles)))
+                      (setf (gnus-info-read info)
+                            (gnus-add-to-range read unfetched-articles)))
 
                     (gnus-group-update-group group t)
                     (sit-for 0)
diff --git a/lisp/gnus/gnus-group.el b/lisp/gnus/gnus-group.el
index 742f8f4be56..5d68163ff39 100644
--- a/lisp/gnus/gnus-group.el
+++ b/lisp/gnus/gnus-group.el
@@ -2973,11 +2973,7 @@ and NEW-NAME will be prompted for."
       (setq info (copy-tree info))
       (setcar info new-group)
       (unless (gnus-server-equal method "native")
-	(unless (nthcdr 3 info)
-	  (nconc info (list nil nil)))
-	(unless (nthcdr 4 info)
-	  (nconc info (list nil)))
-	(gnus-info-set-method info method))
+	(gnus-info-set-method info method t))
       (gnus-group-set-info info))
     (gnus-group-update-group (or new-group group))
     (gnus-group-position-point)))
@@ -3374,14 +3370,12 @@ If REVERSE, sort in reverse order."
   "Sort only the selected GROUPS, using FUNC.
 If REVERSE is non-nil, reverse the sorting."
   (let ((infos (sort
-		(mapcar (lambda (g)
-			  (gnus-get-info g))
-			groups)
+		(mapcar #'gnus-get-info groups)
 		func))
 	sorted-groups)
     (when reverse
       (setq infos (nreverse infos)))
-    (setq sorted-groups (mapcar (lambda (i) (gnus-info-group i)) infos))
+    (setq sorted-groups (mapcar #'gnus-info-group infos))
 
     ;; Find the original locations of GROUPS in `gnus-group-list', and
     ;; replace each one, in order, with a group from SORTED-GROUPS.
@@ -3532,16 +3526,16 @@ Obeys the process/prefix convention."
       `(progn
 	 (gnus-request-set-mark ,group ',action)
 	 (gnus-info-set-marks ',info ',(gnus-info-marks info) t)
-	 (gnus-info-set-read ',info ',(gnus-info-read info))
+	 (setf (gnus-info-read ',info) ',(gnus-info-read info))
 	 (when (gnus-group-jump-to-group ,group)
 	   (gnus-get-unread-articles-in-group ',info ',(gnus-active group) t)
 	   (gnus-group-update-group-line))))
     (setq action (mapcar (lambda (el) (list (nth 0 el) 'del (nth 2 el)))
 			 action))
     (gnus-request-set-mark group action)
-    (gnus-info-set-read info nil)
+    (setf (gnus-info-read info) nil)
     (when (gnus-info-marks info)
-      (gnus-info-set-marks info nil))))
+      (setf (gnus-info-marks info) nil))))
 
 ;; Group catching up.
 
diff --git a/lisp/gnus/gnus-int.el b/lisp/gnus/gnus-int.el
index 0abbfe6720b..a21bc258403 100644
--- a/lisp/gnus/gnus-int.el
+++ b/lisp/gnus/gnus-int.el
@@ -727,7 +727,7 @@ If GROUP is nil, all groups on GNUS-COMMAND-METHOD are scanned."
 	       (let* ((range (if (= min 2) 1 (cons 1 (1- min))))
 		      (read (gnus-info-read info))
 		      (new-read (gnus-range-add read (list range))))
-		 (gnus-info-set-read info new-read)))
+		 (setf (gnus-info-read info) new-read)))
 	     info)))))
 
 (defun gnus-request-expire-articles (articles group &optional force)
diff --git a/lisp/gnus/gnus-sieve.el b/lisp/gnus/gnus-sieve.el
index fc0bf3098b1..5edd6f5f7ae 100644
--- a/lisp/gnus/gnus-sieve.el
+++ b/lisp/gnus/gnus-sieve.el
@@ -128,7 +128,7 @@ Return nil if no rule could be guessed."
 	  (info (gnus-get-info gnus-newsgroup-name)))
       (if (null rule)
 	  (error "Could not guess rule for article")
-	(gnus-info-set-params info (cons rule (gnus-info-params info)))
+	(push rule (gnus-info-params info))
 	(message "Added rule in group %s for article: %s" gnus-newsgroup-name
 		 rule)))))
 
diff --git a/lisp/gnus/gnus-start.el b/lisp/gnus/gnus-start.el
index e142c438ee0..b90229e6f57 100644
--- a/lisp/gnus/gnus-start.el
+++ b/lisp/gnus/gnus-start.el
@@ -1828,7 +1828,7 @@ The info element is shared with the same element of
       ;; Make the same select-methods identical Lisp objects.
       (when (setq method (gnus-info-method info))
 	(if (setq rest (member method methods))
-	    (gnus-info-set-method info (car rest))
+	    (setf (gnus-info-method info) (car rest))
 	  (push method methods)))
       ;; Check for encoded group names and decode them.
       (when (string-match-p "[^[:ascii:]]" (setq gname (car info)))
@@ -1890,8 +1890,8 @@ The info element is shared with the same element of
 	(push article news)))
     (when news
       ;; Enter this list into the group info.
-      (gnus-info-set-read
-       info (gnus-remove-from-range (gnus-info-read info) (nreverse news)))
+      (setf (gnus-info-read info)
+            (gnus-remove-from-range (gnus-info-read info) (nreverse news)))
 
       ;; Set the number of unread articles in gnus-newsrc-hashtb.
       (gnus-get-unread-articles-in-group info (gnus-active group))
@@ -1958,7 +1958,7 @@ The info element is shared with the same element of
       (when (eq modified 'remove-null)
         (setq r (delq nil r)))
       ;; Enter this list into the group info.
-      (gnus-info-set-read info r)
+      (setf (gnus-info-read info) r)
 
       ;; Set the number of unread articles in gnus-newsrc-hashtb.
       (gnus-get-unread-articles-in-group info (gnus-active group))
@@ -2362,12 +2362,11 @@ If FORCE is non-nil, the .newsrc file is read."
 	(setq dormant (cdr (assq 'dormant marks))
 	      ticked (cdr (assq 'tick marks)))
 	(when (or dormant ticked)
-	  (gnus-info-set-read
-	   info
-	   (gnus-add-to-range
-	    (gnus-info-read info)
-	    (nconc (gnus-uncompress-range dormant)
-		   (gnus-uncompress-range ticked)))))))))
+	  (setf (gnus-info-read info)
+	        (gnus-add-to-range
+	         (gnus-info-read info)
+	         (nconc (gnus-uncompress-range dormant)
+		        (gnus-uncompress-range ticked)))))))))
 
 (defun gnus-load (file)
   "Load FILE, but in such a way that read errors can be reported."
@@ -2438,9 +2437,9 @@ If FORCE is non-nil, the .newsrc file is read."
       (while (setq group (pop newsrc))
 	(if (setq info (gnus-get-info (car group)))
 	    (progn
-	      (gnus-info-set-read info (cddr group))
-	      (gnus-info-set-level
-	       info (if (nth 1 group) gnus-level-default-subscribed
+	      (setf (gnus-info-read info) (cddr group))
+	      (setf (gnus-info-level info)
+		    (if (nth 1 group) gnus-level-default-subscribed
 		      gnus-level-default-unsubscribed))
 	      (push info gnus-newsrc-alist))
 	  (push (setq info
@@ -2453,9 +2452,9 @@ If FORCE is non-nil, the .newsrc file is read."
 	(when (setq m (assoc (car group) marked))
 	  (unless (nthcdr 3 info)
 	    (nconc info (list nil)))
-	  (gnus-info-set-marks
-	   info (list (cons 'tick (gnus-compress-sequence
-				   (sort (cdr m) '<) t))))))
+	  (setf (gnus-info-marks info)
+		(list (cons 'tick (gnus-compress-sequence
+				   (sort (cdr m) #'<) t))))))
       (setq newsrc killed)
       (while newsrc
 	(setcar newsrc (caar newsrc))
@@ -2609,7 +2608,7 @@ If FORCE is non-nil, the .newsrc file is read."
 		;; There is an entry for this file in
 		;; `gnus-newsrc-hashtb'.
 		(progn
-		  (gnus-info-set-read info (nreverse reads))
+		  (setf (gnus-info-read info) (nreverse reads))
 		  ;; We update the level very gently.  In fact, we
 		  ;; only change it if there's been a status change
 		  ;; from subscribed to unsubscribed, or vice versa.
@@ -2621,7 +2620,7 @@ If FORCE is non-nil, the .newsrc file is read."
 				       (1+ gnus-level-default-unsubscribed))))
 			((and (> level gnus-level-subscribed) subscribed)
 			 (setq level gnus-level-default-subscribed)))
-		  (gnus-info-set-level info level))
+		  (setf (gnus-info-level info) level))
 	      ;; This is a new group.
 	      (setq info (list group
 			       (if subscribed
diff --git a/lisp/gnus/gnus-sum.el b/lisp/gnus/gnus-sum.el
index 4a51d2c80b6..d62c0634367 100644
--- a/lisp/gnus/gnus-sum.el
+++ b/lisp/gnus/gnus-sum.el
@@ -6367,7 +6367,7 @@ The resulting hash table is returned, or nil if no Xrefs were found."
 	(gnus-undo-register
 	  `(progn
 	     (gnus-info-set-marks ',info ',(gnus-info-marks info) t)
-	     (gnus-info-set-read ',info ',(gnus-info-read info))
+	     (setf (gnus-info-read ',info) ',(gnus-info-read info))
 	     (gnus-get-unread-articles-in-group ',info (gnus-active ,group))
 	     (when ,set-marks
 	       (gnus-request-set-mark
@@ -6375,7 +6375,7 @@ The resulting hash table is returned, or nil if no Xrefs were found."
 	     (gnus-group-jump-to-group ,group)
 	     (gnus-group-update-group ,group t))))
       ;; Add the read articles to the range.
-      (gnus-info-set-read info range)
+      (setf (gnus-info-read info) range)
       (when set-marks
 	(gnus-request-set-mark group (list (list range 'add '(read)))))
       ;; Then we have to re-compute how many unread
@@ -10283,8 +10283,8 @@ ACTION can be either `move' (the default), `crosspost' or `copy'."
 	    (when (and (not (memq article gnus-newsgroup-unreads))
 		       (cdr art-group))
 	      (push 'read to-marks)
-	      (gnus-info-set-read
-	       info (gnus-add-to-range (gnus-info-read info)
+	      (setf (gnus-info-read info)
+		    (gnus-add-to-range (gnus-info-read info)
 				       (list (cdr art-group)))))
 
 	    ;; See whether the article is to be put in the cache.
@@ -12891,14 +12891,14 @@ UNREAD is a sorted list."
 	    (gnus-undo-register
 	      `(progn
 		 (gnus-info-set-marks ',info ',(gnus-info-marks info) t)
-		 (gnus-info-set-read ',info ',(gnus-info-read info))
+		 (setf (gnus-info-read ',info) ',(gnus-info-read info))
 		 (gnus-group-jump-to-group ,group)
 		 (gnus-get-unread-articles-in-group ',info
 						    (gnus-active ,group))
 		 (gnus-group-update-group ,group t)
 		 ,setmarkundo))))
 	;; Enter this list into the group info.
-	(gnus-info-set-read info read)
+	(setf (gnus-info-read info) read)
 	;; Set the number of unread articles in gnus-newsrc-hashtb.
 	(gnus-get-unread-articles-in-group info (gnus-active group))
 	t))))
diff --git a/lisp/gnus/gnus.el b/lisp/gnus/gnus.el
index 0673ac15f60..23643cc6c79 100644
--- a/lisp/gnus/gnus.el
+++ b/lisp/gnus/gnus.el
@@ -2817,67 +2817,50 @@ See Info node `(gnus)Formatting Variables'."
 
 ;; Info access macros.
 
-(defmacro gnus-info-group (info)
-  `(nth 0 ,info))
-(defmacro gnus-info-rank (info)
-  `(nth 1 ,info))
-(defmacro gnus-info-read (info)
-  `(nth 2 ,info))
-(defmacro gnus-info-marks (info)
-  `(nth 3 ,info))
-(defmacro gnus-info-method (info)
-  `(nth 4 ,info))
-(defmacro gnus-info-params (info)
-  `(nth 5 ,info))
-
-(defmacro gnus-info-level (info)
-  `(let ((rank (gnus-info-rank ,info)))
-     (if (consp rank)
-	 (car rank)
-       rank)))
-(defmacro gnus-info-score (info)
-  `(let ((rank (gnus-info-rank ,info)))
-     (or (and (consp rank) (cdr rank)) 0)))
-
-(defmacro gnus-info-set-group (info group)
-  `(setcar ,info ,group))
-(defmacro gnus-info-set-rank (info rank)
-  `(setcar (nthcdr 1 ,info) ,rank))
-(defmacro gnus-info-set-read (info read)
-  `(setcar (nthcdr 2 ,info) ,read))
-(defmacro gnus-info-set-marks (info marks &optional extend)
-  (if extend
-      `(gnus-info-set-entry ,info ,marks 3)
-    `(setcar (nthcdr 3 ,info) ,marks)))
-(defmacro gnus-info-set-method (info method &optional extend)
-  (if extend
-      `(gnus-info-set-entry ,info ,method 4)
-    `(setcar (nthcdr 4 ,info) ,method)))
-(defmacro gnus-info-set-params (info params &optional extend)
-  (if extend
-      `(gnus-info-set-entry ,info ,params 5)
-    `(setcar (nthcdr 5 ,info) ,params)))
-
-(defun gnus-info-set-entry (info entry number)
+(cl-defstruct (gnus-info
+               (:constructor nil)
+               (:type list))
+  group rank read marks method params)
+
+(defsubst gnus-info-level (info)
+  (declare (gv-setter gnus-info--set-level))
+  (let ((rank (gnus-info-rank info)))
+    (if (consp rank)
+	(car rank)
+      rank)))
+(defsubst gnus-info-score (info)
+  (declare (gv-setter gnus-info--set-score))
+  (let ((rank (gnus-info-rank info)))
+    (or (and (consp rank) (cdr rank)) 0)))
+
+(defsubst gnus-info-set-marks (info marks &optional extend)
+  (if extend (gnus-info--grow-entry info 3))
+  (setf (gnus-info-marks info) marks))
+(defsubst gnus-info-set-method (info method &optional extend)
+  (if extend (gnus-info--grow-entry info 4))
+  (setf (gnus-info-method info) method))
+(defsubst gnus-info-set-params (info params &optional extend)
+  (if extend (gnus-info--grow-entry info 5))
+  (setf (gnus-info-params info) params))
+
+(defun gnus-info--grow-entry (info number)
   ;; Extend the info until we have enough elements.
   (while (<= (length info) number)
-    (nconc info (list nil)))
-  ;; Set the entry.
-  (setcar (nthcdr number info) entry))
-
-(defmacro gnus-info-set-level (info level)
-  `(let ((rank (cdr ,info)))
-     (if (consp (car rank))
-	 (setcar (car rank) ,level)
-       (setcar rank ,level))))
-(defmacro gnus-info-set-score (info score)
-  `(let ((rank (cdr ,info)))
-     (if (consp (car rank))
-	 (setcdr (car rank) ,score)
-       (setcar rank (cons (car rank) ,score)))))
-
-(defmacro gnus-get-info (group)
-  `(nth 1 (gethash ,group gnus-newsrc-hashtb)))
+    (nconc info (list nil))))
+
+(defsubst gnus-info--set-level (info level)
+  (let ((rank (gnus-info-rank info)))
+    (if (consp rank)
+        (setcar rank level)
+      (setf (gnus-info-rank info) level))))
+(defsubst gnus-info--set-score (info score)
+  (let ((rank (gnus-info-rank info)))
+     (if (consp rank)
+	 (setcdr rank score)
+       (setf (gnus-info-rank info) (cons rank score)))))
+
+(defsubst gnus-get-info (group)
+  (nth 1 (gethash group gnus-newsrc-hashtb)))
 
 (defun gnus-set-info (group info)
   (setcdr (gethash group gnus-newsrc-hashtb)
@@ -3704,14 +3687,14 @@ GROUP can also be an INFO structure."
 	  (setq params (delq name params))
 	  (while (assq name params)
 	    (gnus-alist-pull name params))
-	  (gnus-info-set-params info params))))))
+	  (setf (gnus-info-params info) params))))))
 
 (defun gnus-group-add-score (group &optional score)
   "Add SCORE to the GROUP score.
 If SCORE is nil, add 1 to the score of GROUP."
   (let ((info (gnus-get-info group)))
     (when info
-      (gnus-info-set-score info (+ (gnus-info-score info) (or score 1))))))
+      (setf (gnus-info-score info) (+ (gnus-info-score info) (or score 1))))))
 
 (defun gnus-short-group-name (group &optional levels)
   "Collapse GROUP name LEVELS.
diff --git a/lisp/gnus/nndiary.el b/lisp/gnus/nndiary.el
index a340804064f..94ea259a335 100644
--- a/lisp/gnus/nndiary.el
+++ b/lisp/gnus/nndiary.el
@@ -793,10 +793,10 @@ all.  This may very well take some time.")
 	  ;;(message "unread: %s" unread)
 	  (sit-for 1)
 	  (kill-buffer buf))
-	(setq unread (sort unread '<))
+	(setq unread (sort unread #'<))
 	(and unread
-	     (gnus-info-set-read info (gnus-update-read-articles
-				       (gnus-info-group info) unread t)))
+	     (setf (gnus-info-read info)
+		   (gnus-update-read-articles (gnus-info-group info) unread t)))
 	))
     (run-hook-with-args 'nndiary-request-update-info-functions
 			(gnus-info-group info))
diff --git a/lisp/gnus/nndraft.el b/lisp/gnus/nndraft.el
index bc475ee2951..a178f1f1194 100644
--- a/lisp/gnus/nndraft.el
+++ b/lisp/gnus/nndraft.el
@@ -147,10 +147,10 @@ are generated if and only if they are also in `message-draft-headers'."
 
 (deffoo nndraft-request-update-info (group info &optional server)
   (nndraft-possibly-change-group group)
-  (gnus-info-set-read
-   info
-   (gnus-update-read-articles (gnus-group-prefixed-name group '(nndraft ""))
-			      (nndraft-articles) t))
+  (setf (gnus-info-read info)
+	(gnus-update-read-articles
+	 (gnus-group-prefixed-name group '(nndraft ""))
+	 (nndraft-articles) t))
   (let ((marks (nth 3 info)))
     (when marks
       ;; Nix out all marks except the `unsend'-able article marks.
diff --git a/lisp/gnus/nnimap.el b/lisp/gnus/nnimap.el
index 800ec3b9597..bbbca8f4193 100644
--- a/lisp/gnus/nnimap.el
+++ b/lisp/gnus/nnimap.el
@@ -1620,7 +1620,7 @@ If LIMIT, first try to limit the search to the N last articles."
 		       read)))
 	      (when (or (not (listp permanent-flags))
 			(memq '%Seen permanent-flags))
-		(gnus-info-set-read info read))
+		(setf (gnus-info-read info) read))
 	      ;; Update the marks.
 	      (setq marks (gnus-info-marks info))
 	      (dolist (type (cdr nnimap-mark-alist))
@@ -1680,14 +1680,13 @@ If LIMIT, first try to limit the search to the N last articles."
 
 (defun nnimap-update-qresync-info (info existing vanished flags)
   ;; Add all the vanished articles to the list of read articles.
-  (gnus-info-set-read
-   info
-   (gnus-add-to-range
-    (gnus-add-to-range
-     (gnus-range-add (gnus-info-read info)
-		     vanished)
-     (cdr (assq '%Flagged flags)))
-    (cdr (assq '%Seen flags))))
+  (setf (gnus-info-read info)
+        (gnus-add-to-range
+         (gnus-add-to-range
+          (gnus-range-add (gnus-info-read info)
+		          vanished)
+	  (cdr (assq '%Flagged flags)))
+	 (cdr (assq '%Seen flags))))
   (let ((marks (gnus-info-marks info)))
     (dolist (type (cdr nnimap-mark-alist))
       (let ((ticks (assoc (car type) marks))
diff --git a/lisp/gnus/nnir.el b/lisp/gnus/nnir.el
index 3b6b8255f71..bf441ee3595 100644
--- a/lisp/gnus/nnir.el
+++ b/lisp/gnus/nnir.el
@@ -874,8 +874,8 @@ A non-nil `specs' arg must be an alist with `nnir-query-spec' and
 (deffoo nnir-request-update-info (group info &optional server)
   (nnir-possibly-change-group group server)
   ;; clear out all existing marks.
-  (gnus-info-set-marks info nil)
-  (gnus-info-set-read info nil)
+  (setf (gnus-info-marks info) nil)
+  (setf (gnus-info-read info) nil)
   (let ((group (gnus-group-guess-full-name-from-command-method group))
 	(articles-by-group
 	 (nnir-categorize
@@ -889,15 +889,15 @@ A non-nil `specs' arg must be an alist with `nnir-query-spec' and
 	     (group-info (gnus-get-info (car group-articles)))
 	     (marks (gnus-info-marks group-info))
 	     (read (gnus-info-read group-info)))
-	(gnus-info-set-read
-	 info
-	 (gnus-add-to-range
-	  (gnus-info-read info)
-	  (delq nil
-		  (mapcar
-		   #'(lambda (art)
-		     (when (gnus-member-of-range (cdr art) read) (car art)))
-		   articleids))))
+	(setf (gnus-info-read info)
+	      (gnus-add-to-range
+	       (gnus-info-read info)
+	       (delq nil
+		     (mapcar
+		      #'(lambda (art)
+		          (when (gnus-member-of-range (cdr art) read)
+		            (car art)))
+		      articleids))))
 	(dolist (mark marks)
 	  (cl-destructuring-bind (type . range) mark
 	    (gnus-add-marked-articles
diff --git a/lisp/gnus/nnmaildir.el b/lisp/gnus/nnmaildir.el
index 0133fc6ce2b..b0e79d4f238 100644
--- a/lisp/gnus/nnmaildir.el
+++ b/lisp/gnus/nnmaildir.el
@@ -1000,7 +1000,7 @@ This variable is set by `nnmaildir-request-article'.")
 	    pgname (nnmaildir--pgname nnmaildir--cur-server gname)
 	    flist (nnmaildir--grp-flist group))
       (when (zerop (nnmaildir--grp-count group))
-	(gnus-info-set-read info nil)
+	(setf (gnus-info-read info) nil)
 	(gnus-info-set-marks info nil 'extend)
 	(throw 'return info))
       (setq old-marks (cons 'read (gnus-info-read info))
@@ -1083,7 +1083,7 @@ This variable is set by `nnmaildir-request-article'.")
 	    (setq ranges (gnus-add-to-range ranges (sort article-list '<)))))
 	(if (eq mark 'read) (setq read ranges)
 	  (if ranges (setq marks (cons (cons mark ranges) marks)))))
-      (gnus-info-set-read info (gnus-range-add read missing))
+      (setf (gnus-info-read info) (gnus-range-add read missing))
       (gnus-info-set-marks info marks 'extend)
       (setf (nnmaildir--grp-mmth group) new-mmth)
       info)))
diff --git a/lisp/gnus/nnmairix.el b/lisp/gnus/nnmairix.el
index 6e527a5a7af..a4a1caac953 100644
--- a/lisp/gnus/nnmairix.el
+++ b/lisp/gnus/nnmairix.el
@@ -711,29 +711,29 @@ Other back ends might or might not work.")
 	    (nnimap-request-update-info-internal folder folderinfo nnmairix-backend-server)
 	  (nnmairix-call-backend "request-update-info" folder folderinfo nnmairix-backend-server))
 	;; set range of read articles
-	(gnus-info-set-read
-	 info
-	 (if docorr
-	     (nnmairix-map-range
-	      `(lambda (x) (+ x ,(cadr corr)))
-	      (gnus-info-read folderinfo))
-	   (gnus-info-read folderinfo)))
+	(setf (gnus-info-read info)
+	      (if docorr
+	          (nnmairix-map-range
+		   ;; FIXME: Use lexical-binding.
+	           `(lambda (x) (+ x ,(cadr corr)))
+	           (gnus-info-read folderinfo))
+	        (gnus-info-read folderinfo)))
 	;; set other marks
-	(gnus-info-set-marks
-	 info
-	 (if docorr
-	     (mapcar (lambda (cur)
-			 (cons
-			  (car cur)
-			  (nnmairix-map-range
-			   `(lambda (x) (+ x ,(cadr corr)))
-			   (list (cadr cur)))))
-		     (gnus-info-marks folderinfo))
-	   (gnus-info-marks folderinfo))))
+	(setf (gnus-info-marks info)
+	      (if docorr
+		  (mapcar (lambda (cur)
+			    (cons
+			     (car cur)
+			     (nnmairix-map-range
+			      ;; FIXME: Use lexical-binding.
+			      `(lambda (x) (+ x ,(cadr corr)))
+			      (list (cadr cur)))))
+			  (gnus-info-marks folderinfo))
+		(gnus-info-marks folderinfo))))
       (when (eq readmarks 'unread)
-	(gnus-info-set-read info nil))
+	(setf (gnus-info-read info) nil))
       (when (eq readmarks 'read)
-	(gnus-info-set-read info (gnus-active qualgroup))))
+	(setf (gnus-info-read info) (gnus-active qualgroup))))
   t)
 
 (nnoo-define-skeleton nnmairix)
diff --git a/lisp/gnus/nnml.el b/lisp/gnus/nnml.el
index 302589bd6d7..8d8d5ae83a1 100644
--- a/lisp/gnus/nnml.el
+++ b/lisp/gnus/nnml.el
@@ -1067,7 +1067,7 @@ Use the nov database for the current group if available."
 		  (when (gnus-member-of-range old-number read)
 		    (setq read (gnus-remove-from-range read (list old-number)))
 		    (setq read (gnus-add-to-range read (list new-number))))
-		  (gnus-info-set-read info read))
+		  (setf (gnus-info-read info) read))
 		;; 2 b/ marked articles:
 		(let ((oldmarks (gnus-info-marks info))
 		      mark newmarks)
@@ -1080,7 +1080,7 @@ Use the nov database for the current group if available."
 		      (setcdr mark (gnus-add-to-range (cdr mark)
 						      (list new-number))))
 		    (push mark newmarks))
-		  (gnus-info-set-marks info newmarks))
+		  (setf (gnus-info-marks info) newmarks))
 		;; 3/ Update the NOV entry for this article:
 		(unless nnml-nov-is-evil
 		  (with-current-buffer (nnml-open-nov group)
diff --git a/lisp/gnus/nnvirtual.el b/lisp/gnus/nnvirtual.el
index 25f3413fcd5..b4a23766622 100644
--- a/lisp/gnus/nnvirtual.el
+++ b/lisp/gnus/nnvirtual.el
@@ -463,11 +463,10 @@ If UPDATE-P is not nil, call gnus-group-update-group on the components."
 	(dolist (group nnvirtual-component-groups)
 	  (when (and (setq info (gnus-get-info group))
 		     (gnus-info-marks info))
-	    (gnus-info-set-marks
-	     info
-	     (if (assq 'score (gnus-info-marks info))
-		 (list (assq 'score (gnus-info-marks info)))
-	       nil))))
+	    (setf (gnus-info-marks info)
+		  (if (assq 'score (gnus-info-marks info))
+		      (list (assq 'score (gnus-info-marks info)))
+		    nil))))
 
 	;; Ok, currently type-marks is an assq list with keys of a mark type,
 	;; with data of an assq list with keys of component group names