1 files changed, 11 insertions, 0 deletions

diff --git a/lisp/subr.el b/lisp/subr.el
index 1abfb4797f5..04b840e882f 100644
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -1252,4 +1252,15 @@ configuration."
 ;      (setq tail (cdr tail))))
 ;  alist)
 
+(defun assoc-delete-all (key alist)
+  "Delete from ALIST all elements whose car is KEY.
+Return the modified alist."
+  (setq alist (copy-sequence alist))
+  (let ((tail alist))
+    (while tail
+      (if (eq (car (car tail)) key)
+          (setq alist (delq (car tail) alist)))
+      (setq tail (cdr tail)))
+    alist))
+
 ;;; subr.el ends here