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diff --git a/src/clojure/contrib/singleton.clj b/src/clojure/contrib/singleton.clj
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--- a/src/clojure/contrib/singleton.clj
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-;;; singleton.clj: singleton functions
-
-;; by Stuart Sierra, http://stuartsierra.com/
-;; April 14, 2009
-
-;; Copyright (c) Stuart Sierra, 2009. All rights reserved.  The use
-;; and distribution terms for this software are covered by the Eclipse
-;; Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
-;; which can be found in the file epl-v10.html at the root of this
-;; distribution.  By using this software in any fashion, you are
-;; agreeing to be bound by the terms of this license.  You must not
-;; remove this notice, or any other, from this software.
-
-
-;; Change Log:
-;;
-;; April 14, 2009: added per-thread-singleton, renamed singleton to
-;; global-singleton
-;;
-;; April 9, 2009: initial version
-
-
-(ns 
-  #^{:author "Stuart Sierra",
-     :doc "Singleton functions"}
-  clojure.contrib.singleton)
-
-(defn global-singleton
-  "Returns a global singleton function.  f is a function of no
-  arguments that creates and returns some object.  The singleton
-  function will call f just once, the first time it is needed, and
-  cache the value for all subsequent calls.
-
-  Warning: global singletons are often unsafe in multi-threaded code.
-  Consider per-thread-singleton instead."
-  [f]
-  (let [instance (atom nil)
-        make-instance (fn [_] (f))]
-    (fn [] (or @instance (swap! instance make-instance)))))
-
-(defn per-thread-singleton
-  "Returns a per-thread singleton function.  f is a function of no
-  arguments that creates and returns some object.  The singleton
-  function will call f only once for each thread, and cache its value
-  for subsequent calls from the same thread.  This allows you to
-  safely and lazily initialize shared objects on a per-thread basis.
-
-  Warning: due to a bug in JDK 5, it may not be safe to use a
-  per-thread-singleton in the initialization function for another
-  per-thread-singleton.  See
-  http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=5025230"
-  [f]
-  (let [thread-local (proxy [ThreadLocal] [] (initialValue [] (f)))]
-    (fn [] (.get thread-local))))