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diff --git a/2d/helpers.scm b/2d/helpers.scm
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-;;; guile-2d
-;;; Copyright (C) 2013, 2014 David Thompson <dthompson2@worcester.edu>
-;;; Copyright (C) 2014 Ludovic Courtès <ludo@gnu.org>
-;;;
-;;; This program is free software: you can redistribute it and/or
-;;; modify it under the terms of the GNU General Public License as
-;;; published by the Free Software Foundation, either version 3 of the
-;;; License, or (at your option) any later version.
-;;;
-;;; This program is distributed in the hope that it will be useful,
-;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
-;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-;;; General Public License for more details.
-;;;
-;;; You should have received a copy of the GNU General Public License
-;;; along with this program.  If not, see
-;;; <http://www.gnu.org/licenses/>.
-
-;;; Commentary:
-;;
-;; Miscellaneous helper procedures.
-;;
-;;; Code:
-
-(define-module (2d helpers)
-  #:use-module (srfi srfi-1)
-  #:use-module (rnrs arithmetic bitwise)
-  #:use-module (2d agenda)
-  #:use-module (2d game)
-  #:export (any-equal?
-            logand?
-            define-guardian
-            memoize))
-
-(define (any-equal? elem . args)
-  "Return #t if ELEM equals any of the elements in the list ARGS."
-  (any (lambda (e) (equal? elem e)) args))
-
-(define (logand? . args)
-  "Return #t if the result of a bitwise AND of the integers in list
-ARGS is non-zero."
-  (not (zero? (apply logand args))))
-
-(define-syntax-rule (define-guardian name reaper)
-  "Define a new guardian called NAME and call REAPER when an object
-within the guardian is GC'd.  Reaping is ensured to happen from the
-same thread that is running the game loop."
-  (begin
-    (define name (make-guardian))
-    (schedule-each
-     (lambda ()
-       (let reap ((obj (name)))
-         (when obj
-           (reaper obj)
-           (reap (name))))))))
-
-(define (memoize proc)
-  "Return a memoizing version of PROC."
-  (let ((cache (make-hash-table)))
-    (lambda args
-      (let ((results (hash-ref cache args)))
-        (if results
-            (apply values results)
-            (let ((results (call-with-values (lambda ()
-                                               (apply proc args))
-                             list)))
-              (hash-set! cache args results)
-              (apply values results)))))))