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diff --git a/third_party/lisp/sclf/lazy.lisp b/third_party/lisp/sclf/lazy.lisp
deleted file mode 100644
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--- a/third_party/lisp/sclf/lazy.lisp
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@@ -1,134 +0,0 @@
-;;;  lazy.lisp --- lazy primitives
-
-;;;  Copyright (C) 2008, 2009, 2010 by Walter C. Pelissero
-
-;;;  Author: Walter C. Pelissero <walter@pelissero.de>
-;;;  Project: sclf
-
-#+cmu (ext:file-comment "$Module: lazy.lisp $")
-
-;;; This library 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 2.1
-;;; of the License, or (at your option) any later version.
-;;; This library 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 library; if not, write to the Free
-;;; Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-;;; 02111-1307 USA
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-;;;
-;;; Lazy primitives
-;;;
-
-(in-package :sclf)
-
-(defstruct promise
-  procedure
-  value)
-
-(defmacro lazy (form)
-  `(make-promise :procedure #'(lambda () ,form)))
-
-(defun forced-p (promise)
-  (null (promise-procedure promise)))
-
-(defun force (promise)
-  (if (forced-p promise)
-      (promise-value promise)
-      (prog1 (setf (promise-value promise)
-                   (funcall (promise-procedure promise)))
-        (setf (promise-procedure promise) nil))))
-
-(defmacro deflazy (name value &optional documentation)
-  `(defparameter ,name (lazy ,value)
-     ,@(when documentation
-             (list documentation))))
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
-(defclass lazy-metaclass (standard-class)
-  ()
-  (:documentation "Metaclass for object having lazy slots.  Lazy slots
-should be specified with the :LAZY keyword which must be a function of
-one argument.  If required this function will be called once to get
-the value to memoize in the slot.  Lazy slots can also be set/read as
-any other."))
-
-(defmethod validate-superclass ((class lazy-metaclass) (super standard-class))
-  "Lazy classes may inherit from ordinary classes."
-  (declare (ignore class super))
-  t)
-
-(defmethod validate-superclass ((class standard-class) (super lazy-metaclass))
-  "Ordinary classes may inherit from lazy classes."
-  (declare (ignore class super))
-  t)
-
-(defclass lazy-slot-mixin ()
-  ((lazy-function :initarg :lazy
-                   :reader lazy-slot-function
-                   :initform nil))
-  (:documentation
-   "Slot for LAZY-METACLASS classes.  Lazy slots must be declared with
-the argument :LAZY which must be a function accepting the object
-instance as argument."))
-
-(defclass lazy-direct-slot-definition (lazy-slot-mixin standard-direct-slot-definition)
-  ())
-
-(defclass lazy-effective-slot-definition (lazy-slot-mixin standard-effective-slot-definition)
-  ())
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
-(defmethod direct-slot-definition-class ((class lazy-metaclass) &rest initargs)
-  (if (getf initargs :lazy nil)
-      (find-class 'lazy-direct-slot-definition)
-      (call-next-method)))
-
-(defmethod effective-slot-definition-class ((class lazy-metaclass) &rest initargs)
-  (if (getf initargs :lazy nil)
-      (find-class 'lazy-effective-slot-definition)
-      (call-next-method)))
-
-(defmethod compute-effective-slot-definition-initargs ((class lazy-metaclass) direct-slots)
-  (let ((ds (car direct-slots)))
-    (if (typep ds 'lazy-direct-slot-definition)
-      (let ((form (lazy-slot-function ds))
-            (args (call-next-method)))
-        (when (or (getf args :initarg)
-                  (getf args :initform))
-          (error "Lazy slot ~S cannot have :INITARG nor :INITFORM arguments." ds))
-        (list* :lazy
-               (cond ((and (listp form)
-                           (eq 'lambda (car form)))
-                      (compile nil form))
-                     ((symbolp form)
-                      form)
-                     (t (compile nil `(lambda (self)
-                                        (declare (ignorable self))
-                                        ,form))))
-               args))
-      (call-next-method))))
-
-(defmethod slot-value-using-class ((class lazy-metaclass) instance (slot lazy-slot-mixin))
-  (declare (ignore class))
-  ;; If the slot is unbound, call the lazy function passing the
-  ;; instance and memoize the value in the slot.
-  (unless (slot-boundp-using-class class instance slot)
-    (setf (slot-value-using-class class instance slot)
-          (funcall (lazy-slot-function slot) instance)))
-  (call-next-method))
-
-(defun reset-lazy-slots (object)
-  "Unbind all the lazy slots in OBJECT so that they will be
-re-evaluated next time their value is requested again."
-  (be* class (class-of object)
-    (dolist (slot (class-slots class))
-      (when (typep slot 'lazy-effective-slot-definition)
-        (slot-makunbound object (slot-definition-name slot))))))
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