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diff --git a/2d/stage.scm b/2d/stage.scm
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--- a/2d/stage.scm
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@@ -1,132 +0,0 @@
-;;; guile-2d
-;;; Copyright (C) 2013 David Thompson <dthompson2@worcester.edu>
-;;;
-;;; Guile-2d is free software: you can redistribute it and/or modify it
-;;; under the terms of the GNU Lesser General Public License as
-;;; published by the Free Software Foundation, either version 3 of the
-;;; License, or (at your option) any later version.
-;;;
-;;; Guile-2d 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
-;;; Lesser General Public License for more details.
-;;;
-;;; You should have received a copy of the GNU Lesser General Public
-;;; License along with this program.  If not, see
-;;; <http://www.gnu.org/licenses/>.
-
-;;; Commentary:
-;;
-;; Stages represent the game state at the present time.
-;;
-;;; Code:
-
-(define-module (2d stage)
-  #:use-module (srfi srfi-9)
-  #:use-module (2d agenda)
-  #:use-module (2d scene)
-  #:export (make-stage
-            stage?
-            stage-agenda
-            stage-state
-            stage-scene
-            set-stage-scene!
-            enter-stage
-            exit-stage
-            draw-stage
-            update-stage
-            stage-trigger
-            make-stage-variable
-            define-stage-variable
-            stage-on
-            stage-off
-            current-stage
-            push-scene
-            pop-scene
-            replace-scene))
-
-(define-record-type <stage>
-  (%make-stage agenda scene state)
-  stage?
-  (agenda stage-agenda)
-  (scene stage-scene set-stage-scene!)
-  (state stage-state))
-
-(define (make-stage scene)
-  "Create a new stage object for SCENE."
-  (%make-stage (make-agenda) scene (init-scene scene)))
-
-;;;
-;;; Scene callbacks
-;;;
-
-(define (enter-stage stage)
-  "Call the scene enter callback for STAGE."
-  (with-agenda (stage-agenda stage)
-    (enter-scene (stage-scene stage)
-                 (stage-state stage))))
-
-(define (exit-stage stage)
-  "Call the scene exit callback for STAGE."
-  (with-agenda (stage-agenda stage)
-    (exit-scene (stage-scene stage)
-                (stage-state stage))))
-
-(define (update-stage stage)
-  "Call the scene update callback for STAGE."
-  (with-agenda (stage-agenda stage)
-    (update-agenda)
-    (update-scene (stage-scene stage)
-                  (stage-state stage))))
-
-(define (draw-stage stage)
-  "Call the scene draw callback for STAGE."
-  (with-agenda (stage-agenda stage)
-    (draw-scene (stage-scene stage)
-                (stage-state stage))))
-
-(define (stage-trigger stage event . args)
-  (with-agenda (stage-agenda stage)
-    (apply scene-trigger
-           (stage-scene stage)
-           (stage-state stage)
-           event
-           args)))
-
-;;;
-;;; Stage management
-;;;
-
-(define stack '())
-
-(define (current-stage)
-  "Return the top of the stage stack or #f if the stack is empty."
-  (if (null? stack) #f (car stack)))
-
-(define (push-scene scene)
-  "Make STAGE active and push it to the top of the stack."
-  (let ((prev-stage (current-stage))
-        (stage (make-stage scene)))
-    (when prev-stage
-      (exit-stage prev-stage))
-    (set! stack (cons stage stack))
-    (enter-stage stage)))
-
-(define (pop-scene)
-  "Replace the current stage with the next one on the stack, if
-present."
-  (let ((prev-stage (current-stage)))
-    (when prev-stage
-      (exit-stage prev-stage))
-    (set! stack (cdr stack))
-    (when (current-stage)
-      (enter-stage (current-stage)))))
-
-(define (replace-scene scene)
-  "Replace the current stage with STAGE."
-  (let ((prev-stage (current-stage))
-        (stage (make-stage scene)))
-    (when prev-stage
-      (exit-stage prev-stage))
-    (set! stack (cons stage (cdr stack)))
-    (enter-stage stage)))