[Emacs-diffs] emacs-25 b6bc4ab: Signal an error when `setf' gets an odd number of arguments.

[Alan Mackenzie]

branch: emacs-25
commit b6bc4ab20cb62edc4ab6dac00918f81781ba1925
Author: Alan Mackenzie <address@hidden>
Commit: Alan Mackenzie <address@hidden>

    Signal an error when `setf' gets an odd number of arguments.
    
    * lisp/emacs-lisp/gv.el (setf): Amend.
---
 lisp/emacs-lisp/gv.el |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/lisp/emacs-lisp/gv.el b/lisp/emacs-lisp/gv.el
index 9e00190..1fea38c 100644
--- a/lisp/emacs-lisp/gv.el
+++ b/lisp/emacs-lisp/gv.el
@@ -260,6 +260,8 @@ The return value is the last VAL in the list.
 
 \(fn PLACE VAL PLACE VAL ...)"
   (declare (debug (&rest [gv-place form])))
+  (if (/= (logand (length args) 1) 0)
+      (signal 'wrong-number-of-arguments (list 'setf (length args))))
   (if (and args (null (cddr args)))
       (let ((place (pop args))
             (val (car args)))