* lisp/format.el (format-proper-list-p): New alias.

etc/NEWS

@@ -713,7 +713,8 @@ manual for more details.
 +++
 ** New function 'proper-list-p'.
 Given a proper list as argument, this predicate returns its length;
-otherwise, it returns nil.
+otherwise, it returns nil.  'format-proper-list-p' is now an obsolete
+alias for the new function.
 
 ** define-minor-mode automatically documents the meaning of ARG
 

lisp/format.el

@@ -539,6 +539,8 @@ Compare using `equal'."
 	(setq tail next)))
     (cons acopy bcopy)))
 
+(define-obsolete-function-alias 'format-proper-list-p 'proper-list-p "27.1")
+
 (defun format-reorder (items order)
   "Arrange ITEMS to follow partial ORDER.
 Elements of ITEMS equal to elements of ORDER will be rearranged