From cc46824b16d36a2b4fc067cf34f3f6bb066c8c84 Mon Sep 17 00:00:00 2001
From: Attila Lendvai <attila.lendvai@gmail.com>
Date: Tue, 4 Mar 2014 13:49:23 +0600
Subject: [PATCH] Replace DELETE-FROM-PLIST implementation, shorter and faster.

Suggested by Stas Boukarev.
---
 lists.lisp | 15 ++-------------
 1 file changed, 2 insertions(+), 13 deletions(-)

diff --git a/lists.lisp b/lists.lisp
index feaa726..502eb71 100644
--- a/lists.lisp
+++ b/lists.lisp
@@ -279,19 +279,8 @@ not destructively modified. Keys are compared using EQ."
   "Just like REMOVE-FROM-PLIST, but this version may destructively modify the
 provided plist."
   (declare (optimize speed))
-  (loop with head = plist
-        with tail = nil   ; a nil tail means an empty result so far
-        for (key . rest) on plist by #'cddr
-        do (assert rest () "Expected a proper plist, got ~S" plist)
-           (if (member key keys :test #'eq)
-               ;; skip over this pair
-               (symbol-macrolet ((next (cdr rest)))
-                 (if tail
-                     (setf (cdr tail) next)
-                     (setf head next)))
-               ;; keep this pair
-               (setf tail rest))
-        finally (return head)))
+  (dolist (key keys plist)
+    (remf plist key)))
 
 (define-modify-macro remove-from-plistf (&rest keys) remove-from-plist
                      "Modify macro for REMOVE-FROM-PLIST.")
-- 
2.11.4.GIT