More cl-lib and gv doc updates

* lisp/emacs-lisp/cl.el (define-setf-expander, defsetf)
(define-modify-macro): Doc fixes.

* doc/misc/cl.texi (Obsolete Setf Customization):
Give defsetf gv.el replacements.

* etc/NEWS: Related edit.

1 files changed, 33 insertions, 19 deletions

diff --git a/lisp/emacs-lisp/cl.el b/lisp/emacs-lisp/cl.el
index 52567f34278..016967bc713 100644
--- a/lisp/emacs-lisp/cl.el
+++ b/lisp/emacs-lisp/cl.el
@@ -547,13 +547,15 @@ deprecated usage of `symbol-function' in place forms)."  ; bug#12760
 
 (defmacro define-setf-expander (name arglist &rest body)
   "Define a `setf' method.
-This method shows how to handle `setf's to places of the form (NAME ARGS...).
-The argument forms ARGS are bound according to ARGLIST, as if NAME were
-going to be expanded as a macro, then the BODY forms are executed and must
-return a list of five elements: a temporary-variables list, a value-forms
-list, a store-variables list (of length one), a store-form, and an access-
-form.  See `gv-define-expander', `gv-define-setter', and `gv-define-expander'
-for a better and simpler ways to define setf-methods."
+This method shows how to handle `setf's to places of the form
+\(NAME ARGS...).  The argument forms ARGS are bound according to
+ARGLIST, as if NAME were going to be expanded as a macro, then
+the BODY forms are executed and must return a list of five elements:
+a temporary-variables list, a value-forms list, a store-variables list
+\(of length one), a store-form, and an access- form.
+
+See `gv-define-expander', and `gv-define-setter' for better and
+simpler ways to define setf-methods."
   (declare (debug
             (&define name cl-lambda-list cl-declarations-or-string def-body)))
   `(progn
@@ -566,23 +568,31 @@ for a better and simpler ways to define setf-methods."
 
 (defmacro defsetf (name arg1 &rest args)
   "Define a `setf' method.
-This macro is an easy-to-use substitute for `define-setf-expander' that works
-well for simple place forms.  In the simple `defsetf' form, `setf's of
-the form (setf (NAME ARGS...) VAL) are transformed to function or macro
-calls of the form (FUNC ARGS... VAL).  Example:
+This macro is an easy-to-use substitute for `define-setf-expander'
+that works well for simple place forms.
+
+In the simple `defsetf' form, `setf's of the form (setf (NAME
+ARGS...) VAL) are transformed to function or macro calls of the
+form (FUNC ARGS... VAL).  For example:
 
   (defsetf aref aset)
 
+You can replace this form with `gv-define-simple-setter'.
+
 Alternate form: (defsetf NAME ARGLIST (STORE) BODY...).
-Here, the above `setf' call is expanded by binding the argument forms ARGS
-according to ARGLIST, binding the value form VAL to STORE, then executing
-BODY, which must return a Lisp form that does the necessary `setf' operation.
-Actually, ARGLIST and STORE may be bound to temporary variables which are
-introduced automatically to preserve proper execution order of the arguments.
-Example:
+
+Here, the above `setf' call is expanded by binding the argument
+forms ARGS according to ARGLIST, binding the value form VAL to
+STORE, then executing BODY, which must return a Lisp form that
+does the necessary `setf' operation.  Actually, ARGLIST and STORE
+may be bound to temporary variables which are introduced
+automatically to preserve proper execution order of the arguments.
+For example:
 
   (defsetf nth (n x) (v) `(setcar (nthcdr ,n ,x) ,v))
 
+You can replace this form with `gv-define-setter'.
+
 \(fn NAME [FUNC | ARGLIST (STORE) BODY...])"
   (declare (debug
             (&define name
@@ -639,8 +649,12 @@ Example:
 
 (defmacro define-modify-macro (name arglist func &optional doc)
   "Define a `setf'-like modify macro.
-If NAME is called, it combines its PLACE argument with the other arguments
-from ARGLIST using FUNC: (define-modify-macro incf (&optional (n 1)) +)"
+If NAME is called, it combines its PLACE argument with the other
+arguments from ARGLIST using FUNC.  For example:
+
+  (define-modify-macro incf (&optional (n 1)) +)
+
+You can replace this macro with `gv-letplace'."
   (declare (debug
             (&define name cl-lambda-list ;; should exclude &key
                      symbolp &optional stringp)))