1 files changed, 4 insertions, 7 deletions
diff --git a/queue.lisp b/queue.lisp
index cc91eb8..c900731 100644
--- a/queue.lisp
+++ b/queue.lisp
@@ -1,6 +1,6 @@
 (in-package #:queue)
 
-(declaim (optimize (speed 3) (safety 0)))
+(declaim (optimize (speed 3) (safety 1)))
 
 (defun new ()
   (cons nil nil))
@@ -8,12 +8,9 @@
 (defun add (q datum)
   (let ((element (cons datum nil)))
     (if (car q)
-      (progn
-        (setf (cddr q) element)
-        (setf (cdr q) (cddr q)))
-      (progn
-        (setf (car q) element)
-        (setf (cdr q) element)))
+      (setf (cddr q) element)
+      (setf (car q) element))
+    (setf (cdr q) element)
     q))
 
 (defun sub (q)