* lisp/emacs-lisp/cl-generic.el (cl-generic-generalizers): Don't emit warning

Also remove "WARNING" annotations after confirming that he code was right.

etc/NEWS

@@ -813,7 +813,7 @@ It is now defined as a generalized variable that can be used with
 ---
 *** 'form' in '(eql form)' specializers in 'cl-defmethod' is now evaluated.
 This corresponds to the behaviour of defmethod in Common Lisp Object System.
-A warning is issued when old style is used.
+For compatibility, '(eql SYMBOL)' does not evaluate SYMBOL, for now.
 
 ** New minor mode 'cl-font-lock-built-in-mode' for 'lisp-mode'.
 The mode provides refined highlighting of built-in functions, types,

lisp/emacs-lisp/cl-generic.el

@@ -1161,7 +1161,12 @@ These match if the argument is `eql' to VAL."
   (let ((form (cadr specializer)))
     (puthash (if (or (not (symbolp form)) (macroexp-const-p form))
                  (eval form t)
-               (message "Quoting obsolete `eql' form: %S" specializer)
+               ;; FIXME: Compatibility with Emacs<28.  For now emitting
+               ;; a warning would be annoying for third party packages
+               ;; which can't use the new form without breaking compatibility
+               ;; with older Emacsen, but in the future we should emit
+               ;; a warning.
+               ;; (message "Quoting obsolete `eql' form: %S" specializer)
                form)
              specializer cl--generic-eql-used))
   (list cl--generic-eql-generalizer))
@@ -1274,11 +1279,6 @@ Used internally for the (major-mode MODE) context specializers."
 (cl-generic-define-context-rewriter major-mode (mode &rest modes)
   `(major-mode ,(if (consp mode)
                     ;;E.g. could be (eql ...)
-                    ;; WARNING: unsure whether this
-                    ;; “could be (eql ...)” commentary (or code)
-                    ;; should be adjusted
-                    ;; following the (planned) changes to eql specializer.
-                    ;; Bug #47327
                     (progn (cl-assert (null modes)) mode)
                   `(derived-mode ,mode . ,modes))))
 

lisp/frame.el

@@ -36,11 +36,7 @@ as its argument.")
 (cl-generic-define-context-rewriter window-system (value)
   ;; If `value' is a `consp', it's probably an old-style specializer,
   ;; so just use it, and anyway `eql' isn't very useful on cons cells.
-  `(window-system ,(if (consp value) value
-                     ;; WARNING: unsure whether this eql expression
-                     ;; is actually an eql specializer.
-                     ;; Bug #47327
-                     `(eql ',value))))
+  `(window-system ,(if (consp value) value `(eql ',value))))
 
 (cl-defmethod frame-creation-function (params &context (window-system nil))
   ;; It's tempting to get rid of tty-create-frame-with-faces and turn it into