diff --git a/pkgs/drracket-pkgs/drracket/drracket/private/unit.rkt b/pkgs/drracket-pkgs/drracket/drracket/private/unit.rkt
index 77369cf4c3..be2f4812a8 100644
--- a/pkgs/drracket-pkgs/drracket/drracket/private/unit.rkt
+++ b/pkgs/drracket-pkgs/drracket/drracket/private/unit.rkt
@@ -4496,7 +4496,6 @@
         (if (null? v)
             (send bug-icon show #f)
             (send bug-icon show #t)))
-      (set-bug-label (preferences:get 'drracket:saved-bug-reports))
       (define remove-bug-icon-callback
         (preferences:add-callback
          'drracket:saved-bug-reports
@@ -4608,6 +4607,7 @@
                         (λ (l)
                           (cons btn (remq* (list btn) l))))
                   btn))
+          (set-bug-label (preferences:get 'drracket:saved-bug-reports))
           
           (set! func-defs-canvas (new func-defs-canvas% 
                                       (parent name-panel)
diff --git a/pkgs/racket-pkgs/racket-doc/scribblings/reference/data.scrbl b/pkgs/racket-pkgs/racket-doc/scribblings/reference/data.scrbl
index 8f46951318..01eef58bcc 100644
--- a/pkgs/racket-pkgs/racket-doc/scribblings/reference/data.scrbl
+++ b/pkgs/racket-pkgs/racket-doc/scribblings/reference/data.scrbl
@@ -1,6 +1,5 @@
 #lang scribble/doc
-@(require "mz.rkt"
-          (for-label racket/undefined))
+@(require "mz.rkt")
 
 @title[#:style 'toc #:tag "data"]{Datatypes}
 
@@ -170,33 +169,5 @@ The @|void-const| value is always @racket[eq?] to itself.
 @defproc[(void [v any/c] ...) void?]{Returns the constant @|void-const|. Each
  @racket[v] argument is ignored.}
 
-
 @; ----------------------------------------------------------------------
-@section[#:tag "undefined"]{Undefined}
-
-@note-lib[racket/undefined]
-
-The constant @racket[undefined] is conceptually used as a placeholder
-value for a binding, so that a reference to a binding before its
-definition can be detected. Such references are normally protected
-implicitly via @racket[check-not-undefined], so that an expression does
-not normally produce an @racket[undefined] value.
-
-The @racket[undefined] value is always @racket[eq?] to itself.
-
-@history[#:added "6.0.0.6"]
-
-@defproc[(undefined? [v any/c]) boolean?]{Returns @racket[#t] if @racket[v] is the
- constant @racket[undefined], @racket[#f] otherwise.}
-
-
-@defthing[undefined undefined?]{The ``undefined'' constant.}
-
-@defproc[(check-not-undefined [v any/c] [sym symbol?]) (and/c any/c (not/c undefined?))]{
-
-Checks whether @racket[v] is @racket[undefined], and raises
-@racket[exn:fail:contract:variable] in that case with an error message
-along the lines of ``@racket[sym]: variable used before its definition.''
-If @racket[v] is not @racket[undefined], then @racket[v] is returned.
-
-}
+@include-section["undefined.scrbl"]
diff --git a/pkgs/racket-pkgs/racket-doc/scribblings/reference/undefined.scrbl b/pkgs/racket-pkgs/racket-doc/scribblings/reference/undefined.scrbl
new file mode 100644
index 0000000000..8f313bd027
--- /dev/null
+++ b/pkgs/racket-pkgs/racket-doc/scribblings/reference/undefined.scrbl
@@ -0,0 +1,23 @@
+#lang scribble/doc
+@(require "mz.rkt"
+          (for-label racket/undefined))
+
+@title[#:tag "undefined"]{Undefined}
+
+@note-lib[racket/undefined]
+
+The constant @racket[undefined] can be used as a placeholder value for
+a value to be installed later, especially for cases where premature
+access of the value is either difficult or impossible to detect or
+prevent.
+
+The @racket[undefined] value is always @racket[eq?] to itself.
+
+@history[#:added "6.0.0.6"]
+
+@defproc[(undefined? [v any/c]) boolean?]{
+
+Returns @racket[#t] if @racket[v] is the constant @racket[undefined],
+@racket[#f] otherwise.}
+
+@defthing[undefined undefined?]{The ``undefined'' constant.}
diff --git a/pkgs/racket-pkgs/racket-doc/scribblings/reference/unsafe-undefined.scrbl b/pkgs/racket-pkgs/racket-doc/scribblings/reference/unsafe-undefined.scrbl
new file mode 100644
index 0000000000..6fd6027b25
--- /dev/null
+++ b/pkgs/racket-pkgs/racket-doc/scribblings/reference/unsafe-undefined.scrbl
@@ -0,0 +1,55 @@
+#lang scribble/doc
+@(require "mz.rkt"
+          (for-label racket/unsafe/undefined))
+
+@title[#:tag "unsafe-undefined"]{Unsafe Undefined}
+
+@note-lib[racket/unsafe/undefined]
+
+The constant @racket[unsafe-undefined] is used internally as a
+placeholder value. For example, it is used by @racket[letrec] as a
+value for a variable that has not yet been assigned a value.  Unlike
+the @racket[undefined] value exported by @racket[racket/undefined],
+however, the @racket[unsafe-undefined] value should not leak as the
+result of a safe expression. Expression results that potentially
+produce @racket[unsafe-undefined] can be guarded by
+@racket[check-not-unsafe-undefined], so that an exception can be
+raised instead of producing an @racket[undefined] value.
+
+The @racket[unsafe-undefined] value is always @racket[eq?] to itself.
+
+@history[#:added "6.0.0.6"]
+
+@defproc[(unsafe-undefined? [v any/c]) boolean?]{
+
+Returns @racket[#t] if @racket[v] is the constant
+@racket[unsafe-undefined], @racket[#f] otherwise.}
+
+
+@defthing[unsafe-undefined unsafe-undefined?]{
+
+The unsafe ``undefined'' constant.}
+
+
+@defproc[(check-not-unsafe-undefined [v any/c] [sym symbol?])
+         (and/c any/c (not/c unsafe-undefined?))]{
+
+Checks whether @racket[v] is @racket[unsafe-undefined], and raises
+@racket[exn:fail:contract:variable] in that case with an error message
+along the lines of ``@racket[sym]: variable used before its
+definition.''  If @racket[v] is not @racket[unsafe-undefined], then
+@racket[v] is returned.}
+
+@defthing[prop:chaperone-unsafe-undefined struct-type-property?]{
+
+A @tech{structure type property} that causes a structure type's
+constructor to produce a @tech{chaperone} of an instance where every
+access of a field in the structure is checked to prevent returning
+@racket[unsafe-undefined].
+
+The property value should be a list of symbols used as field names,
+but the list should be in reverse order of the structure's fields.
+When a field access would otherwise produce @racket[unsafe-undefined],
+the @racket[exn:fail:contract:variable] exception is raised if a field
+name is provided by the structure property's value, otherwise the
+@racket[exn:fail:contract] exception is raised.}
diff --git a/pkgs/racket-pkgs/racket-doc/scribblings/reference/unsafe.scrbl b/pkgs/racket-pkgs/racket-doc/scribblings/reference/unsafe.scrbl
index 463a4a2b41..ece83f5613 100644
--- a/pkgs/racket-pkgs/racket-doc/scribblings/reference/unsafe.scrbl
+++ b/pkgs/racket-pkgs/racket-doc/scribblings/reference/unsafe.scrbl
@@ -418,3 +418,7 @@ Unchecked versions of @racket[extflvector-length], @racket[extflvector-ref], and
 @racket[extflvector-set!]. A @tech{extflvector}'s size can never be larger than a
 @tech{fixnum} (so even @racket[extflvector-length] always returns a
 fixnum).}
+
+@; ------------------------------------------------------------------------
+
+@include-section["unsafe-undefined.scrbl"]
diff --git a/pkgs/racket-pkgs/racket-test/tests/racket/object.rktl b/pkgs/racket-pkgs/racket-test/tests/racket/object.rktl
index 2b13eec1db..db0e81f2dc 100644
--- a/pkgs/racket-pkgs/racket-test/tests/racket/object.rktl
+++ b/pkgs/racket-pkgs/racket-test/tests/racket/object.rktl
@@ -1922,6 +1922,122 @@
 (test 5 'send-generic (send-generic (new c%) (generic c% m) 5))
 (test 6 'send-generic-interface (send-generic (new c/i%) (generic i<%> m) 6))
 
+;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; check error reporting for variable use before assignment
+
+(let ()
+  (define c%
+    (class object%
+      (define x 7)
+      (field [h 10])
+      (super-new)))
+  
+  (define d%
+    (class c%
+      (define z z)
+      (super-new)))
+
+  (define e%
+    (class d%
+      (define q 1)
+      (field [s 1])
+      (super-new)))
+
+  (define d2%
+    (class c%
+      (define z 1)
+      (field [f f])
+      (super-new)))
+
+  (define e2%
+    (class d2%
+      (define q 1)
+      (field [s 1])
+      (super-new)))
+  
+  (err/rt-test (new d%) (lambda (exn)
+                          (and (exn:fail:contract:variable? exn)
+                               (eq? 'z (exn:fail:contract:variable-id exn)))))
+  (err/rt-test (new e%) (lambda (exn)
+                          (and (exn:fail:contract:variable? exn)
+                               (eq? 'z (exn:fail:contract:variable-id exn)))))
+  (err/rt-test (new d2%) (lambda (exn)
+                           (and (exn:fail:contract:variable? exn)
+                                (eq? 'f (exn:fail:contract:variable-id exn)))))
+  (err/rt-test (new e2%) (lambda (exn)
+                           (and (exn:fail:contract:variable? exn)
+                                (eq? 'f (exn:fail:contract:variable-id exn))))))
+
+;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; check optimization to omit use-before-definition chaperone:
+
+;; Relies on expansion where the next-to-last argument of `compose-class`
+;; is #t when the chaperone is needed.
+
+(let ()
+  (define (check-opt e opt?)
+    (test #t
+          `(,opt? ,e)
+          (let ([e (expand e)])
+            (let loop ([e e])
+              (cond
+               [(and (pair? e)
+                     (pair? (cdr e))
+                     (eq? (syntax-e (car e)) 'compose-class))
+                (eq? opt? (syntax-case (list-ref e (- (length e) 2)) (quote)
+                            [(quote #f) #t]
+                            [(quote #t) #f]
+                            [_ 'unknown]))]
+               [(syntax? e)
+                (loop (syntax-e e))]
+               [(pair? e)
+                (and (loop (car e)) (loop (cdr e)))]
+               [else #t])))))
+
+  (check-opt '(class object%) #t)
+  (check-opt '(class object% (super-new)) #t)
+
+  (check-opt '(class object% (define x 1)) #t)
+  (check-opt '(class object% (define x 1) (super-new)) #t)
+  (check-opt '(class object% (field [x 1]) (super-new)) #t)
+  (check-opt '(class object% (init-field [x 1]) (super-new)) #t)
+  (check-opt '(class object% (define x (+ 1 2))) #t)
+  (check-opt '(class object% (define x (free-var 1))) #t)
+
+  (check-opt '(class object% (define x x)) #f)
+  (check-opt '(class object% (field [x x])) #f)
+  (check-opt '(class object% (init-field [x x])) #f)
+  (check-opt '(class object% (super-new) (define x 1)) #f)
+  (check-opt '(class object% (super-make-object) (define x 1)) #f)
+  (check-opt '(class object% (super-instantiate ()) (define x 1)) #f)
+  (check-opt '(class object% (displayln this) (define x 1)) #f)
+  (check-opt '(class object% (inherit m) (m) (define x 1)) #f)
+  (check-opt '(class object% (define/override (m) x) (super m) (define x 1)) #f)
+
+  (check-opt '(class object% (define x 1) (define y 1) (super-new)) #t)
+  (check-opt '(class object% (define x 1) (define y x) (super-new)) #t)
+  (check-opt '(class object% (field [x 1] [y x]) (super-new)) #t)
+  (check-opt '(class object% (field [x 1] [y x]) (super-make-object)) #t)
+  (check-opt '(class object% (init-field [x 1] [y x]) (super-new)) #t)
+  (check-opt '(class object% (init-field [x 1]) (define y x) (super-new)) #t)
+  (check-opt '(class object% (define x 1) (define y (list x)) (super-new)) #t)
+  (check-opt '(class object% (define/public (m) x) (define x 1) (super-new)) #t)
+  (check-opt '(class object% (define/override (m) x) (define x 1) (super-new)) #t)
+
+  (check-opt '(class object% (define x y) (define y 1) (super-new)) #f)
+  (check-opt '(class object% (init-field [x y] [y 1])) #f)
+
+  (check-opt '(class object% (inherit-field f) (super-new) (displayln f)) #t)
+  (check-opt '(class object% (inherit-field f) (displayln f) (super-new)) #f)
+  (check-opt '(class object% (inherit-field f) (set! f 10) (super-new)) #t)
+
+  ;; Ok to use after explicit assignment that's before the decl:
+  (check-opt '(class object% (set! y 7) (define x y) (define y 1) (super-new)) #t)
+  ;; But not in a branch
+  (check-opt '(class object% (when ? (set! y 7)) (define x y) (define y 1) (super-new)) #f)
+
+  (void))
+
 ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
 (report-errs)
diff --git a/racket/collects/racket/private/class-c-old.rkt b/racket/collects/racket/private/class-c-old.rkt
index 2e05c84b44..3127f28e3d 100644
--- a/racket/collects/racket/private/class-c-old.rkt
+++ b/racket/collects/racket/private/class-c-old.rkt
@@ -236,6 +236,7 @@
                             field-pub-width
                             field-ht
                             (class-field-ids cls)
+                            (class-all-field-ids cls)
                             
                             'struct:object 'object? 'make-object
                             'field-ref 'field-set!
@@ -247,6 +248,8 @@
                             
                             (class-orig-cls cls)
                             #f #f ; serializer is never set
+                            
+                            (class-check-undef? cls)
                             #f)]
              [obj-name (if name
                            (string->symbol (format "object:~a" name))
@@ -500,6 +503,7 @@
                             field-pub-width
                             field-ht
                             (class-field-ids cls)
+                            (class-all-field-ids cls)
                             
                             'struct:object 'object? 'make-object
                             'field-ref 'field-set!
@@ -511,6 +515,9 @@
                             
                             (class-orig-cls cls)
                             #f #f ; serializer is never set
+
+                            (class-check-undef? cls)
+
                             #f)]
              [obj-name (if name
                            (string->symbol (format "object:~a" name))
@@ -1249,6 +1256,7 @@
                         field-pub-width
                         field-ht
                         (class-field-ids cls)
+                        (class-all-field-ids cls)
                         
                         'struct:object 'object? 'make-object
                         'field-ref 'field-set!
@@ -1259,6 +1267,8 @@
                         
                         (class-orig-cls cls)
                         #f #f ; serializer is never set
+
+                        (class-check-undef? cls)
                         #f)]
          [obj-name (if name
                        (string->symbol (format "wrapper-object:~a" name))
diff --git a/racket/collects/racket/private/class-internal.rkt b/racket/collects/racket/private/class-internal.rkt
index 1191c811eb..00bf874926 100644
--- a/racket/collects/racket/private/class-internal.rkt
+++ b/racket/collects/racket/private/class-internal.rkt
@@ -9,7 +9,8 @@
          (only-in "../contract/region.rkt" current-contract-region)
          "../contract/base.rkt"
          "../contract/combinator.rkt"
-         racket/undefined
+         racket/unsafe/undefined
+         "class-undef.rkt"
          (for-syntax racket/stxparam
                      syntax/kerncase
                      syntax/stx
@@ -1219,8 +1220,7 @@
                                                            [class-name class-name])
                                                (syntax-track-origin
                                                 (syntax/loc e 
-                                                  (begin 
-                                                    1 ; to ensure a non-empty body
+                                                  (begin
                                                     (set! id (extract-arg 'class-name `idpos init-args defval))
                                                     ...))
                                                 e
@@ -1232,7 +1232,6 @@
                                                           (map normalize-init/field (syntax->list #'(idp ...)))])
                                              (syntax-track-origin
                                               (syntax/loc e (begin 
-                                                              1 ; to ensure a non-empty body
                                                               (set! iid expr)
                                                               ...))
                                               e
@@ -1247,7 +1246,8 @@
                                                                  #'id/rename
                                                                  (stx-car #'id/rename))])
                                              (syntax-track-origin
-                                              (syntax/loc e (set! id (extract-rest-args n init-args)))
+                                              (syntax/loc e
+                                                (set! id (extract-rest-args n init-args)))
                                               e
                                               #'-i-r))]
                                           [(-i-r)
@@ -1271,7 +1271,7 @@
                           [definify (lambda (l)
                                       (map bind-local-id l)
                                       l)])
-                      
+
                       ;; ---- set up field and method mappings ----
                       (with-syntax ([(rename-super-orig ...) (definify (map car rename-supers))]
                                     [(rename-super-orig-localized ...) (map lookup-localize (map car rename-supers))]
@@ -1348,14 +1348,16 @@
                                      public-final-name ...
                                      pubment-name ...)
                                     (values
-                                     (make-field-map (quote-syntax the-finder)
+                                     (make-field-map #t
+                                                     (quote-syntax the-finder)
                                                      (quote the-obj)
                                                      (quote-syntax inherit-field-name)
                                                      (quote-syntax inherit-field-name-localized)
                                                      (quote-syntax inherit-field-accessor)
                                                      (quote-syntax inherit-field-mutator))
                                      ...
-                                     (make-field-map (quote-syntax the-finder)
+                                     (make-field-map #f
+                                                     (quote-syntax the-finder)
                                                      (quote the-obj)
                                                      (quote-syntax local-field)
                                                      (quote-syntax local-field-localized)
@@ -1486,18 +1488,22 @@
                                           [inspector (if (pair? inspect-decls)
                                                          (stx-car (stx-cdr (car inspect-decls)))
                                                          #'(current-inspector))]
-                                          [deserialize-id-expr deserialize-id-expr])
+                                          [deserialize-id-expr deserialize-id-expr]
+                                          [private-field-names private-field-names])
                               (add-decl-props
                               (quasisyntax/loc stx
-                                (let ([superclass super-expression]
-                                      [interfaces (list interface-expression ...)])
-                                  (compose-class 
-                                   'name superclass interfaces inspector deserialize-id-expr #,any-localized?
+                                (detect-field-unsafe-undefined
+                                 compose-class
+                                   'name 
+                                   super-expression
+                                   (list interface-expression ...)
+                                   inspector deserialize-id-expr #,any-localized?
                                    ;; Field count:
                                    num-fields
                                    ;; Field names:
                                    `field-names
                                    `inherit-field-names
+                                   `private-field-names ; for undefined-checking property
                                    ;; Method names:
                                    `(rename-super-name ... rename-super-extra-name ...)
                                    `(rename-inner-name ... rename-inner-extra-name ...)
@@ -1620,42 +1626,54 @@
                                                           (syntax-case stx () 
                                                             [(_ (arg (... ...)) (kw kwarg) (... ...))
                                                              (with-syntax ([stx stx])
-                                                               (syntax (-instantiate super-go stx #f (the-obj si_c si_inited? 
-                                                                                                           si_leftovers)
-                                                                                     (list arg (... ...)) 
-                                                                                     (kw kwarg) (... ...))))]))]
+                                                               (syntax
+                                                                (begin
+                                                                  `(declare-super-new)
+                                                                  (-instantiate super-go stx #f (the-obj si_c si_inited? 
+                                                                                                         si_leftovers)
+                                                                                (list arg (... ...)) 
+                                                                                (kw kwarg) (... ...)))))]))]
                                                        [super-new-param
                                                         (lambda (stx)
                                                           (syntax-case stx () 
                                                             [(_ (kw kwarg) (... ...))
                                                              (with-syntax ([stx stx])
-                                                               (syntax (-instantiate super-go stx #f (the-obj si_c si_inited? 
-                                                                                                           si_leftovers)
-                                                                                     null
-                                                                                     (kw kwarg) (... ...))))]))]
+                                                               (syntax
+                                                                (begin
+                                                                  `(declare-super-new)
+                                                                  (-instantiate super-go stx #f (the-obj si_c si_inited? 
+                                                                                                         si_leftovers)
+                                                                                null
+                                                                                (kw kwarg) (... ...)))))]))]
                                                        [super-make-object-param
                                                         (lambda (stx)
                                                           (let ([code 
                                                                  (quote-syntax
                                                                   (lambda args
                                                                     (super-go the-obj si_c si_inited? si_leftovers args null)))])
-                                                            (if (identifier? stx)
-                                                                code
-                                                                (datum->syntax
-                                                                 code
-                                                                 (cons code
-                                                                       (cdr (syntax-e stx)))))))])
+                                                            #`(begin
+                                                                `(declare-super-new)
+                                                                #,(if (identifier? stx)
+                                                                      code
+                                                                      (datum->syntax
+                                                                       code
+                                                                       (cons code
+                                                                             (cdr (syntax-e stx))))))))])
                                                       (letrec-syntaxes+values
                                                           ([(plain-init-name) (make-init-redirect 
                                                                                (quote-syntax set!)
                                                                                (quote-syntax #%plain-app)
                                                                                (quote-syntax local-plain-init-name)
                                                                                (quote-syntax plain-init-name-localized))] ...)
-                                                        ([(local-plain-init-name) undefined] ...)
+                                                        ([(local-plain-init-name) unsafe-undefined] ...)
                                                         (void) ; in case the body is empty
-                                                        . exprs)))))))))))))
+                                                        (begin
+                                                          '(declare-field-use-start) ; see "class-undef.rkt"
+                                                          . exprs))))))))))))))
+                                   ;; Extra argument added here by `detect-field-unsafe-undefined`
+                                   #; check-undef?
                                    ;; Not primitive:
-                                   #f)))))))))))))))))
+                                   #f))))))))))))))))
     
     ;; The class* and class entry points:
     (values
@@ -1746,7 +1764,6 @@
                                      ()
                                      defn-or-expr ...))]))
 
-
 (define-syntaxes (private* public* pubment* override* overment* augride* augment*
                            public-final* override-final* augment-final*)
   (let ([mk
@@ -1969,6 +1986,7 @@
                       field-pub-width ; total number of public fields
                       field-ht       ; maps public field names to field-infos (see make-field-info above)
                       field-ids      ; list of public field names
+                      all-field-ids  ; list of field names in reverse order, used for `undefined` error reporting
                       
                       [struct:object ; structure type for instances
                        #:mutable]
@@ -2000,6 +2018,8 @@
                        #:mutable]
                       [fixup         ; for deserialization
                        #:mutable]
+
+                      check-undef?   ; objects need an unsafe-undefined guarding chaperone?
                       
                       no-super-init?); #t => no super-init needed
   #:inspector insp)
@@ -2044,6 +2064,7 @@ last few projections.
                        num-fields          ; total fields (public & private)
                        public-field-names  ; list of symbols (shorter than num-fields)
                        inherit-field-names ; list of symbols (not included in num-fields)
+                       private-field-names ; list of symbols (the rest of num-fields)
                        
                        rename-super-names  ; list of symbols
                        rename-inner-names
@@ -2063,6 +2084,9 @@ last few projections.
                        init-mode           ; 'normal, 'stop, or 'list
                        
                        make-methods        ; takes field and method accessors
+                       
+                       check-undef?
+                       
                        make-struct:prim)   ; see "primitive classes", below
   (define (make-method proc meth-name)
     (procedure-rename
@@ -2288,11 +2312,15 @@ last few projections.
                                 methods super-methods int-methods beta-methods meth-flags
                                 inner-projs dynamic-idxs dynamic-projs
                                 field-width field-pub-width field-ht field-names
+                                (append (reverse private-field-names)
+                                        (reverse public-field-names)
+                                        (class-all-field-ids super))
                                 'struct:object 'object? 'make-object 'field-ref 'field-set!
                                 init-args
                                 init-mode
                                 'init
                                 #f #f #f ; serializer is set later
+                                (or check-undef? (class-check-undef? super))
                                 (and make-struct:prim #t))]
                  [obj-name (if name
                                (string->symbol (format "object:~a" name))
@@ -2347,10 +2375,14 @@ last few projections.
                                                  (add-properties (class-struct:object super) interfaces)
                                                  0 ;; No init fields
                                                  ;; Fields for new slots:
-                                                 num-fields undefined
+                                                 num-fields unsafe-undefined
                                                  ;; Map object property to class:
                                                  (append
                                                   (list (cons prop:object c))
+                                                  (if (class-check-undef? c)
+                                                      (list (cons prop:chaperone-unsafe-undefined
+                                                                  (class-all-field-ids c)))
+                                                      null)
                                                   (if deserialize-id
                                                       (list
                                                        (cons prop:serializable
@@ -3078,7 +3110,7 @@ An example
 
                  (vector) (vector) (vector)
                  
-                 0 0 (make-hasheq) null
+                 0 0 (make-hasheq) null null
                  
                  'struct:object object? 'make-object
                  'field-ref-not-needed 'field-set!-not-needed
@@ -3094,6 +3126,8 @@ An example
                  #f
                  (lambda (obj) #(()))        ; serialize
                  (lambda (obj args) (void))  ; deserialize-fixup
+
+                 #f   ; no chaperone to guard against unsafe-undefined
                  
                  #t)) ; no super-init
 
@@ -3242,6 +3276,7 @@ An example
                                field-pub-width
                                field-ht
                                (class-field-ids cls)
+                               (class-all-field-ids cls)
 
                                'struct:object 'object? 'make-object
                                'field-ref 'field-set!
@@ -3252,6 +3287,8 @@ An example
 
                                (class-orig-cls cls)
                                #f #f    ; serializer is never set
+
+                               (class-check-undef? cls)
                                #f)]
                 [obj-name (if name
                               (string->symbol (format "wrapper-object:~a" name))
@@ -3265,7 +3302,7 @@ An example
                                            (class-struct:object cls)
                                            0 ;; No init fields
                                            0 ;; No new fields in this class replacement
-                                           undefined
+                                           unsafe-undefined
                                            ;; Map object property to class:
                                            (list (cons prop:object c)))])
              (set-class-struct:object! c struct:object)
@@ -4261,7 +4298,7 @@ An example
                  #f
                  #f
                  
-                 0 null null ; no fields
+                 0 null null null ; no fields
                  
                  null ; no rename-supers
                  null ; no rename-inners
@@ -4289,6 +4326,8 @@ An example
                              (if init-arg-names
                                  (extract-primitive-args this name init-arg-names init-args)
                                  init-args)))))
+
+                 #f
                  
                  make-struct:prim))
 
diff --git a/racket/collects/racket/private/class-undef.rkt b/racket/collects/racket/private/class-undef.rkt
new file mode 100644
index 0000000000..71f42aa044
--- /dev/null
+++ b/racket/collects/racket/private/class-undef.rkt
@@ -0,0 +1,201 @@
+#lang racket/base
+(require (for-syntax racket/base
+                     syntax/private/boundmap
+                     syntax/kerncase))
+
+(provide declare-field-use-start
+         declare-field-assignment
+         declare-field-use
+         declare-inherit-use
+         declare-this-escapes
+         declare-super-new
+         
+         detect-field-unsafe-undefined)
+
+;; The `class` macros inject declarations into expansions
+;; of the form `(begin (_declare-word _id ...) _expr ...)`
+;; for each of the following `_declare-word`s:
+(define-syntax declare-field-use-start #f) ; marks start of initialization
+(define-syntax declare-field-assignment #f)
+(define-syntax declare-field-use #f)
+(define-syntax declare-inherit-use #f)
+(define-syntax declare-this-escapes #f)
+(define-syntax declare-super-new #f)
+
+;; A wrapper macro that runs the `need-undeed-check?` analysis
+;; and adds a boolean argument to a call to `compose-class`:
+(define-syntax (detect-field-unsafe-undefined stx)
+  (syntax-case stx ()
+    [(_ compose-class arg ... proc final)
+     (let-values ([(exp exp-proc) (syntax-local-expand-expression #'proc)])
+       (with-syntax ([exp-proc exp-proc]
+                     [need-undef? (need-undefined-check? exp)])
+         (syntax/loc stx
+           (compose-class arg ... proc need-undef? final))))]))
+
+;; Analysis to detect whether any field can be referenced while
+;; its value is `unsafe-undefined`, based on `declare-...` annotations
+;; inserted by macros.
+(define-for-syntax (need-undefined-check? exp)
+  ;; All local fields need to be initialized (i.e., assigned)
+  ;; before a method call or `super-new`
+  (define init-too-late? #f)
+  ;; It's ok to use inherited fields only after `super-new` has
+  ;; definitely been called:
+  (define super-new? #f)
+
+  ;; cloop returns #t if access-before-definition looks possible:
+  (let cloop ([exp exp]
+              [ready #f] ; table of initializations, after start
+              [in-branch? #f])
+    (define (loop e) (cloop e ready in-branch?))
+
+    (kernel-syntax-case exp #f
+      [_
+       (identifier? exp)
+       #f]
+
+      ;; ----------------------------------------
+      ;; Handle annotations at start of `begin`:
+
+      [(begin) #f]
+      [(begin '(decl) . body)
+       (and (identifier? #'decl)
+            (free-identifier=? #'decl #'declare-field-use-start))
+       ;; Beginning of the class body; start tracking initialization
+       ;; creating the `ready` table:
+       (cloop #`(begin . body) (make-module-identifier-mapping) #f)]
+      [(begin '(decl id ...) . body)
+       (and (identifier? #'decl)
+            (free-identifier=? #'decl #'declare-field-use))
+       ;; A field is used. If tracking has started, make sure the
+       ;; field is definitely initalized:
+       (or (and ready
+                (ormap (lambda (id)
+                         (not (module-identifier-mapping-get ready id (lambda () #f))))
+                       (syntax->list #'(id ...)))
+                (report #'body)
+                #t)
+           (loop #'(begin . body)))]
+      [(begin '(decl id ...) . body)
+       (and (identifier? #'decl)
+            (free-identifier=? #'decl #'declare-field-assignment))
+       ;; A field is assigned. If this is after an action that
+       ;; might read a field externally, it's too late. Otherwise,
+       ;; assuming that we're not in a branch, the field is after here
+       ;; assigned (but not before the right-hand side is evaluated):
+       (let ([ids (syntax->list #'(id ...))])
+         (or (and ready
+                  init-too-late?
+                  (ormap (lambda (id)
+                           (not (module-identifier-mapping-get ready id (lambda () #f))))
+                         ids)
+                  (report #'body)
+                  #t)
+              ;; field is ready after RHS is evaluated:
+             (begin0
+              (loop #'(begin . body))
+              (when ready
+                (unless in-branch?
+                  (for-each (lambda (id)
+                              (module-identifier-mapping-put! ready id #t))
+                            ids))))))]
+      [(begin '(decl id ...) . body)
+       (and (identifier? #'decl)
+            (free-identifier=? #'decl #'declare-inherit-use))
+       ;; It's ok to use an inherited field only if `super-new` has
+       ;; definitely been called.
+       (or (and ready
+                (not super-new?)
+                (report #'body)
+                #t)
+           (loop #'(begin . body)))]
+      [(begin '(decl) . body)
+       (and (identifier? #'decl)
+            (free-identifier=? #'decl #'declare-this-escapes))
+       ;; Any method call or explicit use of `this` means a field
+       ;; might be accessed outside of the `class` declaration,
+       ;; so any initialization afterward is too late:
+       (begin
+         (when ready (set! init-too-late? #t))
+         (loop #'(begin . body)))]
+
+      [(begin '(decl) . body)
+       (and (identifier? #'decl)
+            (free-identifier=? #'decl #'declare-super-new))
+       ;; As long as we're not in a branch, `super-new` is definitely
+       ;; called after here.
+       (begin
+         (when (and ready (not in-branch?)) (set! super-new? #t))
+         (loop #'(begin '(declare-this-escapes) . body)))]
+
+      ;; ----------------------------------------
+      ;; Abstract interpretation of core forms.
+
+      ;; We model order by calling `cloop` in order, which can mutate
+      ;; `init-too-late?`, `super-new?` and `ready`. (Those could
+      ;; have been threaded through, but local mutation is easier.)
+
+      ;; We model both branches and delayed computation (via closures)
+      ;; by recurring with a true `in-branch?`. In a branch, we
+      ;; pessimistically ignore initialization (via local-field
+      ;; assignment) and super-new`, and pessimistcally assume all
+      ;; references, method calls, and inherite-field assignemtnt.
+      ;; [Room for improvement: use a functional table in place of
+      ;; `ready`, etc., and suitably split and merge.]
+
+      [(begin exp . body)
+       (or (loop #'exp)
+           (loop #'(begin . body)))]
+
+      [(#%plain-lambda _ exp ...)
+       (cloop #'(begin exp ...) ready #t)]
+      [(case-lambda clause ...)
+       (ormap (lambda (clause)
+                (cloop #`(#%plain-lambda . #,clause) ready #t))
+              (syntax->list #'(clause ...)))]
+      [(if tst thn els)
+       (or (loop #'tst)
+           (cloop #'thn ready #t)
+           (cloop #'els ready #t))]
+      [(begin0 exp ...)
+       (loop #'(begin exp ...))]
+      [(let-values ([(id ...) exp] ...) body-exp ...)
+       (loop #'(begin exp ... body-exp ...))]
+      [(letrec-values ([(id ...) exp] ...) body-exp ...)
+       (loop #'(begin exp ... body-exp ...))]
+      [(letrec-syntaxes+values _ ([(id ...) exp] ...) body-exp ...)
+       (loop #'(begin exp ... body-exp ...))]
+      [(set! id exp)
+       (loop #'exp)]
+
+      [(quote . _) #f]
+      [(quote-syntax . _) #f]
+      
+      [(with-continuation-mark key val exp)
+       (loop #'(begin key val exp))]
+      
+      [(#%plain-app exp ...)
+       (loop #'(begin exp ...))]
+      [(#%top . _) #f]
+      [(#%variable-reference . _) #f]
+
+      [(#%expression expr) (loop #'expr)]
+
+      [_else (raise-syntax-error #f "unrecognized expression form" exp)])))
+
+(define-for-syntax (report exprs)
+  (when (pair? (syntax->list exprs))
+    (define expr (car (syntax->list exprs)))
+    (define s (srcloc->string (srcloc (syntax-source expr)
+                                      (syntax-line expr)
+                                      (syntax-column expr)
+                                      (syntax-position expr)
+                                      (syntax-span expr))))
+    (log-message (make-logger 'optimizer (current-logger))
+                 'debug
+                 (format "chaperoning to prevent undefined access due to: ~.s~a~a"
+                         (syntax->datum expr)
+                         (if s " at: " "")
+                         (or s ""))
+                 #f)))
diff --git a/racket/collects/racket/private/classidmap.rkt b/racket/collects/racket/private/classidmap.rkt
index b0dd01c342..87b48db320 100644
--- a/racket/collects/racket/private/classidmap.rkt
+++ b/racket/collects/racket/private/classidmap.rkt
@@ -3,8 +3,9 @@
 (require syntax/stx
          (for-syntax racket/base)
          (for-template racket/base
-                       racket/undefined
-                       "class-wrapped.rkt"))
+                       racket/unsafe/undefined
+                       "class-wrapped.rkt"
+                       "class-undef.rkt"))
 
 (define insp (variable-reference->module-declaration-inspector
               (#%variable-reference)))
@@ -35,6 +36,18 @@
 (define (binding from to stx)
   stx)
 
+;; Declarations used to determine whether a chaperone is
+;; needed to protect against unsafe-undefined access
+(define (add-declare-this-escapes src-stx stx)
+  (quasisyntax/loc src-stx (begin '(declare-this-escapes) #,stx)))
+(define (add-declare-field-use id inherited? src-stx stx)
+  (if inherited?
+      (quasisyntax/loc src-stx (begin '(declare-inherit-use #,id) #,stx))
+      (quasisyntax/loc src-stx (begin '(declare-field-use #,id) #,stx))))
+(define (add-declare-field-assignment id inherited? src-stx stx)
+  (if inherited?
+      stx
+      (quasisyntax/loc src-stx (begin '(declare-field-assignment #,id) #,stx))))
 
 (define (make-this-map orig-id the-finder the-obj)
   (let ([set!-stx (datum->syntax the-finder 'set!)])
@@ -46,11 +59,13 @@
           (free-identifier=? (syntax set!) set!-stx)
           (raise-syntax-error 'class "cannot mutate object identifier" stx)]
          [(id . args)
-          (datum->syntax 
+          (add-declare-this-escapes
            stx
-           (cons (find the-finder the-obj stx) (syntax args))
-           stx)]
-         [id (find the-finder the-obj stx)])))))
+           (datum->syntax
+            stx
+            (cons (find the-finder the-obj stx) (syntax args))
+            stx))]
+         [id (add-declare-this-escapes stx (find the-finder the-obj stx))])))))
 
 (define (make-this%-map replace-stx the-finder)
   (let ([set!-stx (datum->syntax the-finder 'set!)])
@@ -66,9 +81,10 @@
          [(f . args)
           (quasisyntax/loc stx (#,replace-stx . args))])))))
 
-(define (make-field-map the-finder the-obj the-binder the-binder-localized
+(define (make-field-map inherited? the-finder the-obj the-binder the-binder-localized
                         field-accessor field-mutator)
   (let ([set!-stx (datum->syntax the-finder 'set!)])
+    (define (choose-src a b) (if (syntax-source a) a b))
     (mk-set!-trans
      the-binder-localized
      (lambda (stx)
@@ -77,20 +93,32 @@
           (syntax-case stx ()
             [(set! id expr)
              (free-identifier=? (syntax set!) set!-stx)
-             (with-syntax ([bindings (syntax/loc stx ([obj obj-expr] [id expr]))]
-                           [set (quasisyntax/loc stx
-                                  ((unsyntax field-mutator) obj id))])
-               (syntax/loc stx (let* bindings set)))]
+             (add-declare-field-assignment
+              #'id
+              inherited?
+              #'id
+              (with-syntax ([bindings (syntax/loc stx ([obj obj-expr] [id expr]))]
+                            [set (quasisyntax/loc stx
+                                   ((unsyntax field-mutator) obj id))])
+                (syntax/loc (choose-src stx #'id) (let* bindings set))))]
             [(id . args)
-             (with-syntax ([bindings (syntax/loc stx ([obj obj-expr]))]
-                           [call (quasisyntax/loc stx
-                                   ((check-not-undefined ((unsyntax field-accessor) obj) 'id) . args))])
-               (syntax/loc stx (let* bindings call)))]
+             (add-declare-field-use
+              #'id
+              inherited?
+              #'id
+              (with-syntax ([bindings (syntax/loc stx ([obj obj-expr]))]
+                            [call (quasisyntax/loc stx
+                                    (((unsyntax field-accessor) obj) . args))])
+                (syntax/loc (choose-src stx #'id) (let* bindings call))))]
             [id
-             (with-syntax ([bindings (syntax/loc stx ([obj obj-expr]))]
-                           [get (quasisyntax/loc stx
-                                  (check-not-undefined ((unsyntax field-accessor) obj) 'id))])
-               (syntax/loc stx (let* bindings get)))])))))))
+             (add-declare-field-use
+              #'id
+              inherited?
+              stx
+              (with-syntax ([bindings (syntax/loc stx ([obj obj-expr]))]
+                            [get (quasisyntax/loc stx
+                                   ((unsyntax field-accessor) obj))])
+                (syntax/loc (choose-src stx #'id) (let* bindings get))))])))))))
 
 (define (make-method-map the-finder the-obj the-binder the-binder-localized method-accessor)
   (let ([set!-stx (datum->syntax the-finder 'set!)])
@@ -103,15 +131,17 @@
            (free-identifier=? (syntax set!) set!-stx)
            (raise-syntax-error 'class "cannot mutate method" stx)]
           [(id . args)
-           (binding
-            the-binder (syntax id)
-            (datum->syntax 
-             the-finder
-             (make-method-apply
-              (list method-accessor (find the-finder the-obj stx))
-              (find the-finder the-obj stx)
-              (syntax args))
-             stx))]
+           (add-declare-this-escapes
+            stx
+            (binding
+             the-binder (syntax id)
+             (datum->syntax 
+              the-finder
+              (make-method-apply
+               (list method-accessor (find the-finder the-obj stx))
+               (find the-finder the-obj stx)
+               (syntax args))
+              stx)))]
           [_else
            (raise-syntax-error 
             'class 
@@ -131,12 +161,14 @@
            (free-identifier=? (syntax set!) set!-stx)
            (raise-syntax-error 'class "cannot mutate method" stx)]
           [(id . args)
-           (binding
-            the-binder (syntax id)
-            (datum->syntax 
-             the-finder
-             (make-method-apply (find the-finder new-name stx) (find the-finder the-obj stx) (syntax args))
-             stx))]
+           (add-declare-this-escapes
+            stx
+            (binding
+             the-binder (syntax id)
+             (datum->syntax 
+              the-finder
+              (make-method-apply (find the-finder new-name stx) (find the-finder the-obj stx) (syntax args))
+              stx)))]
           [_else
            (raise-syntax-error 
             'class 
@@ -154,12 +186,14 @@
            (free-identifier=? (syntax set!) set!-stx)
            (raise-syntax-error 'class "cannot mutate super method" stx)]
           [(id . args)
-           (binding
-            the-binder (syntax id)
-            (datum->syntax 
-             the-finder
-             (make-method-apply (find the-finder rename-temp stx) (find the-finder the-obj stx) (syntax args))
-             stx))]
+           (add-declare-this-escapes
+            stx
+            (binding
+             the-binder (syntax id)
+             (datum->syntax 
+              the-finder
+              (make-method-apply (find the-finder rename-temp stx) (find the-finder the-obj stx) (syntax args))
+              stx)))]
           [_else
            (raise-syntax-error 
             'class 
@@ -180,13 +214,15 @@
           [(id (lambda () default) . args)
            (free-identifier=? (syntax lambda) lambda-stx)
            (let ([target (find the-finder the-obj stx)])
-             (binding
-              the-binder (syntax id)
-              (datum->syntax 
-               the-finder
-               (make-method-apply (list (find the-finder rename-temp stx) target #'default)
-                                  target (syntax args))
-               stx)))]
+             (add-declare-this-escapes
+              stx
+              (binding
+               the-binder (syntax id)
+               (datum->syntax 
+                the-finder
+                (make-method-apply (list (find the-finder rename-temp stx) target #'default)
+                                   target (syntax args))
+                stx))))]
           [(id (lambda largs default) . args)
            (free-identifier=? (syntax lambda) lambda-stx)
            (raise-syntax-error 
@@ -211,27 +247,31 @@
             stx)]))))))
 
 (define (generate-super-call stx the-finder the-obj rename-temp args)
-  (class-syntax-protect
-   (datum->syntax 
-    the-finder
-    (make-method-apply (find the-finder rename-temp stx) 
-                       (find the-finder the-obj stx) 
-                       args)
-    stx)))
+  (add-declare-this-escapes
+   stx
+   (class-syntax-protect
+    (datum->syntax 
+     the-finder
+     (make-method-apply (find the-finder rename-temp stx) 
+                        (find the-finder the-obj stx) 
+                        args)
+     stx))))
 
 (define (generate-inner-call stx the-finder the-obj default-expr rename-temp args)
-  (class-syntax-protect
-   (datum->syntax 
-    the-finder
-    (let ([target (find the-finder the-obj stx)])
-      (datum->syntax 
-       the-finder
-       `(let ([i (,(find the-finder rename-temp stx) ,target)])
-          (if i
-              ,(make-method-apply 'i target args)
-              ,default-expr))
-       stx))
-    stx)))
+  (add-declare-this-escapes
+   stx
+   (class-syntax-protect
+    (datum->syntax 
+     the-finder
+     (let ([target (find the-finder the-obj stx)])
+       (datum->syntax 
+        the-finder
+        `(let ([i (,(find the-finder rename-temp stx) ,target)])
+           (if i
+               ,(make-method-apply 'i target args)
+               ,default-expr))
+        stx))
+     stx))))
 
 (define (make-init-error-map localized-id)
   (mk-set!-trans
@@ -253,14 +293,22 @@
          (with-syntax ([local-id local-id])
            (syntax/loc stx (set! local-id expr)))]
         [(id . args)
-         (with-syntax ([local-id local-id]
+         (with-syntax ([local-id (datum->syntax
+                                  local-id
+                                  (syntax-e local-id)
+                                  #'id
+                                  #'id)]
                        [#%app #%app-stx])
-           (syntax/loc stx (#%app local-id . args)))]
-        [_else (datum->syntax
-                local-id
-                (syntax-e local-id)
-                stx
-                stx)])))))
+           (syntax/loc stx (#%app (#%app check-not-unsafe-undefined local-id 'id) . args)))]
+        [id (quasisyntax/loc stx
+              (#,#%app-stx
+               check-not-unsafe-undefined
+               #,(datum->syntax
+                  local-id
+                  (syntax-e local-id)
+                  stx
+                  stx)
+               'id))])))))
 
 (define super-error-map
   (lambda (stx)
diff --git a/racket/collects/racket/private/pre-base.rkt b/racket/collects/racket/private/pre-base.rkt
index b3bbb836e4..8266105f22 100644
--- a/racket/collects/racket/private/pre-base.rkt
+++ b/racket/collects/racket/private/pre-base.rkt
@@ -179,8 +179,7 @@
                               procedure->method procedure-rename
                               chaperone-procedure impersonate-procedure
                               assq assv assoc
-                              prop:incomplete-arity prop:method-arity-error
-                              check-not-undefined undefined)
+                              prop:incomplete-arity prop:method-arity-error)
              (all-from "reqprov.rkt")
              (all-from-except "for.rkt"
                               define-in-vector-like
diff --git a/racket/collects/racket/undefined.rkt b/racket/collects/racket/undefined.rkt
index bd9b7d367f..a193bbaca3 100644
--- a/racket/collects/racket/undefined.rkt
+++ b/racket/collects/racket/undefined.rkt
@@ -1,8 +1,10 @@
 #lang racket/base
-(require '#%kernel)
 
-(provide check-not-undefined
-         undefined
+(provide undefined
          undefined?)
 
+(define-values (struct:undef make-undef undef? undef-ref undef-set!)
+  (make-struct-type 'undefined #f 0 0))
+(define undefined (make-undef))
+
 (define (undefined? v) (eq? v undefined))
diff --git a/racket/collects/racket/unit.rkt b/racket/collects/racket/unit.rkt
index d637f9b4f9..84e87e6c4c 100644
--- a/racket/collects/racket/unit.rkt
+++ b/racket/collects/racket/unit.rkt
@@ -17,7 +17,7 @@
                      "private/unit-syntax.rkt"))
 
 (require racket/block
-         racket/undefined
+         racket/unsafe/undefined
          racket/contract/base
          racket/contract/region
          racket/stxparam
@@ -967,7 +967,7 @@
              (list (cons 'dept depr) ...)
              (syntax-parameterize ([current-contract-region (lambda (stx) #'(quote (unit name)))])
                (lambda ()
-                 (let ([eloc (box undefined)] ... ...)
+                 (let ([eloc (box unsafe-undefined)] ... ...)
                    (values 
                     (lambda (import-table)
                       (let-values ([(iloc ...)
@@ -1005,7 +1005,10 @@
                                                       (define-values (e-post-id ...) 
                                                         (letrec-syntaxes+values (post-renames ...) ()
                                                           e-post-rhs)) ... ...)))))
-                    (unit-export ((export-key ...) (vector-immutable (λ () (unbox eloc)) ...)) ...)))))))
+                    (unit-export ((export-key ...)
+                                  (vector-immutable (λ () (check-not-unsafe-undefined (unbox eloc) 'int-evar))
+                                                    ...))
+                                 ...)))))))
           import-tagged-sigids
           export-tagged-sigids
           dep-tagged-sigids))))))
@@ -1187,8 +1190,8 @@
         (lambda (int/ext-name index ctc)
           (bound-identifier-mapping-put! def-table
                                          (car int/ext-name)
-                                         #`(check-not-undefined (vector-ref #,v #,index)
-                                                                '#,(car int/ext-name)))
+                                         #`(check-not-unsafe-undefined (vector-ref #,v #,index)
+                                                                       '#,(car int/ext-name)))
           (bound-identifier-mapping-put! ctc-table
                                          (car int/ext-name)
                                          ctc)
diff --git a/racket/collects/racket/unsafe/ops.rkt b/racket/collects/racket/unsafe/ops.rkt
index 753f246287..c4ed47627b 100644
--- a/racket/collects/racket/unsafe/ops.rkt
+++ b/racket/collects/racket/unsafe/ops.rkt
@@ -3,7 +3,10 @@
          '#%flfxnum
          '#%extfl)
 
-(provide (all-from-out '#%unsafe)
+(provide (except-out (all-from-out '#%unsafe)
+                     unsafe-undefined
+                     check-not-unsafe-undefined
+                     prop:chaperone-unsafe-undefined)
          (prefix-out unsafe-
                      (combine-out flsin flcos fltan
                                   flasin flacos flatan
diff --git a/racket/collects/racket/unsafe/undefined.rkt b/racket/collects/racket/unsafe/undefined.rkt
new file mode 100644
index 0000000000..94fc7e6746
--- /dev/null
+++ b/racket/collects/racket/unsafe/undefined.rkt
@@ -0,0 +1,9 @@
+#lang racket/base
+(require '#%unsafe)
+
+(provide check-not-unsafe-undefined
+         unsafe-undefined
+         unsafe-undefined?
+         prop:chaperone-unsafe-undefined)
+
+(define (unsafe-undefined? v) (eq? v unsafe-undefined))
diff --git a/racket/src/racket/src/cstartup.inc b/racket/src/racket/src/cstartup.inc
index 960baf2a3a..211e2f395b 100644
--- a/racket/src/racket/src/cstartup.inc
+++ b/racket/src/racket/src/cstartup.inc
@@ -1,5 +1,5 @@
   {
-    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,54,46,48,46,49,46,50,84,0,0,0,0,0,0,0,0,0,0,
+    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,54,46,48,46,49,46,51,84,0,0,0,0,0,0,0,0,0,0,
 0,0,0,0,0,0,0,0,0,0,51,0,0,0,1,0,0,10,0,14,0,
 21,0,28,0,33,0,37,0,40,0,45,0,58,0,62,0,67,0,74,0,83,
 0,87,0,93,0,107,0,121,0,124,0,130,0,134,0,136,0,147,0,149,0,
@@ -22,58 +22,58 @@
 37,11,8,240,18,88,0,0,93,144,2,16,36,37,16,2,2,13,146,2,2,
 37,2,13,2,2,2,13,96,38,11,8,240,18,88,0,0,16,0,96,11,11,
 8,240,18,88,0,0,16,0,18,98,64,104,101,114,101,13,16,6,36,2,14,
-2,2,11,11,11,8,32,8,31,8,30,8,29,27,248,22,166,4,195,249,22,
-159,4,80,143,39,36,251,22,92,2,18,248,22,104,199,12,249,22,82,2,19,
-248,22,106,201,27,248,22,166,4,195,249,22,159,4,80,143,39,36,251,22,92,
-2,18,248,22,104,199,249,22,82,2,19,248,22,106,201,12,27,248,22,84,248,
-22,166,4,196,28,248,22,90,193,20,14,144,37,36,37,28,248,22,90,248,22,
-84,194,248,22,146,18,193,249,22,159,4,80,143,39,36,251,22,92,2,18,248,
-22,146,18,199,249,22,82,2,6,248,22,147,18,201,11,18,100,10,13,16,6,
+2,2,11,11,11,8,32,8,31,8,30,8,29,27,248,22,164,4,195,249,22,
+157,4,80,143,39,36,251,22,90,2,18,248,22,102,199,12,249,22,80,2,19,
+248,22,104,201,27,248,22,164,4,195,249,22,157,4,80,143,39,36,251,22,90,
+2,18,248,22,102,199,249,22,80,2,19,248,22,104,201,12,27,248,22,82,248,
+22,164,4,196,28,248,22,88,193,20,14,144,37,36,37,28,248,22,88,248,22,
+82,194,248,22,144,18,193,249,22,157,4,80,143,39,36,251,22,90,2,18,248,
+22,144,18,199,249,22,80,2,6,248,22,145,18,201,11,18,100,10,13,16,6,
 36,2,14,2,2,11,11,11,8,32,8,31,8,30,8,29,16,4,11,11,2,
 20,3,1,8,101,110,118,49,55,54,55,55,16,4,11,11,2,21,3,1,8,
-101,110,118,49,55,54,55,56,27,248,22,84,248,22,166,4,196,28,248,22,90,
-193,20,14,144,37,36,37,28,248,22,90,248,22,84,194,248,22,146,18,193,249,
-22,159,4,80,143,39,36,250,22,92,2,22,248,22,92,249,22,92,248,22,92,
-2,23,248,22,146,18,201,251,22,92,2,18,2,23,2,23,249,22,82,2,7,
-248,22,147,18,204,18,100,11,13,16,6,36,2,14,2,2,11,11,11,8,32,
+101,110,118,49,55,54,55,56,27,248,22,82,248,22,164,4,196,28,248,22,88,
+193,20,14,144,37,36,37,28,248,22,88,248,22,82,194,248,22,144,18,193,249,
+22,157,4,80,143,39,36,250,22,90,2,22,248,22,90,249,22,90,248,22,90,
+2,23,248,22,144,18,201,251,22,90,2,18,2,23,2,23,249,22,80,2,7,
+248,22,145,18,204,18,100,11,13,16,6,36,2,14,2,2,11,11,11,8,32,
 8,31,8,30,8,29,16,4,11,11,2,20,3,1,8,101,110,118,49,55,54,
 56,48,16,4,11,11,2,21,3,1,8,101,110,118,49,55,54,56,49,248,22,
-166,4,193,27,248,22,166,4,194,249,22,82,248,22,92,248,22,83,196,248,22,
-147,18,195,27,248,22,84,248,22,166,4,23,197,1,249,22,159,4,80,143,39,
-36,28,248,22,66,248,22,160,4,248,22,83,23,198,2,27,249,22,2,32,0,
-88,148,8,36,37,43,11,9,222,33,40,248,22,166,4,248,22,104,23,200,2,
-250,22,92,2,24,248,22,92,249,22,92,248,22,92,248,22,146,18,23,204,2,
-250,22,93,2,25,249,22,2,22,83,23,204,2,248,22,106,23,206,2,249,22,
-82,248,22,146,18,23,202,1,249,22,2,22,104,23,200,1,250,22,93,2,22,
-249,22,2,32,0,88,148,8,36,37,47,11,9,222,33,41,248,22,166,4,248,
-22,146,18,201,248,22,147,18,198,27,248,22,166,4,194,249,22,82,248,22,92,
-248,22,83,196,248,22,147,18,195,27,248,22,84,248,22,166,4,23,197,1,249,
-22,159,4,80,143,39,36,250,22,93,2,24,249,22,2,32,0,88,148,8,36,
-37,47,11,9,222,33,43,248,22,166,4,248,22,83,201,248,22,147,18,198,27,
-248,22,84,248,22,166,4,196,27,248,22,166,4,248,22,83,195,249,22,159,4,
-80,143,40,36,28,248,22,90,195,250,22,93,2,22,9,248,22,84,199,250,22,
-92,2,10,248,22,92,248,22,83,199,250,22,93,2,5,248,22,147,18,201,248,
-22,84,202,27,248,22,84,248,22,166,4,23,197,1,27,249,22,1,22,96,249,
-22,2,22,166,4,248,22,166,4,248,22,83,199,248,22,187,4,249,22,159,4,
-80,143,41,36,251,22,92,1,22,119,105,116,104,45,99,111,110,116,105,110,117,
-97,116,105,111,110,45,109,97,114,107,2,26,250,22,93,1,23,101,120,116,101,
+164,4,193,27,248,22,164,4,194,249,22,80,248,22,90,248,22,81,196,248,22,
+145,18,195,27,248,22,82,248,22,164,4,23,197,1,249,22,157,4,80,143,39,
+36,28,248,22,64,248,22,158,4,248,22,81,23,198,2,27,249,22,2,32,0,
+88,148,8,36,37,43,11,9,222,33,40,248,22,164,4,248,22,102,23,200,2,
+250,22,90,2,24,248,22,90,249,22,90,248,22,90,248,22,144,18,23,204,2,
+250,22,91,2,25,249,22,2,22,81,23,204,2,248,22,104,23,206,2,249,22,
+80,248,22,144,18,23,202,1,249,22,2,22,102,23,200,1,250,22,91,2,22,
+249,22,2,32,0,88,148,8,36,37,47,11,9,222,33,41,248,22,164,4,248,
+22,144,18,201,248,22,145,18,198,27,248,22,164,4,194,249,22,80,248,22,90,
+248,22,81,196,248,22,145,18,195,27,248,22,82,248,22,164,4,23,197,1,249,
+22,157,4,80,143,39,36,250,22,91,2,24,249,22,2,32,0,88,148,8,36,
+37,47,11,9,222,33,43,248,22,164,4,248,22,81,201,248,22,145,18,198,27,
+248,22,82,248,22,164,4,196,27,248,22,164,4,248,22,81,195,249,22,157,4,
+80,143,40,36,28,248,22,88,195,250,22,91,2,22,9,248,22,82,199,250,22,
+90,2,10,248,22,90,248,22,81,199,250,22,91,2,5,248,22,145,18,201,248,
+22,82,202,27,248,22,82,248,22,164,4,23,197,1,27,249,22,1,22,94,249,
+22,2,22,164,4,248,22,164,4,248,22,81,199,248,22,185,4,249,22,157,4,
+80,143,41,36,251,22,90,1,22,119,105,116,104,45,99,111,110,116,105,110,117,
+97,116,105,111,110,45,109,97,114,107,2,26,250,22,91,1,23,101,120,116,101,
 110,100,45,112,97,114,97,109,101,116,101,114,105,122,97,116,105,111,110,21,95,
 1,27,99,111,110,116,105,110,117,97,116,105,111,110,45,109,97,114,107,45,115,
-101,116,45,102,105,114,115,116,11,2,26,202,250,22,93,2,22,9,248,22,84,
-204,27,248,22,84,248,22,166,4,196,28,248,22,90,193,20,14,144,37,36,37,
-249,22,159,4,80,143,39,36,27,248,22,166,4,248,22,83,197,28,249,22,169,
-9,62,61,62,248,22,160,4,248,22,104,196,250,22,92,2,22,248,22,92,249,
-22,92,21,93,2,27,248,22,83,199,250,22,93,2,11,249,22,92,2,27,249,
-22,92,248,22,113,203,2,27,248,22,84,202,251,22,92,2,18,28,249,22,169,
-9,248,22,160,4,248,22,83,200,64,101,108,115,101,10,248,22,146,18,197,250,
-22,93,2,22,9,248,22,147,18,200,249,22,82,2,11,248,22,84,202,99,13,
+101,116,45,102,105,114,115,116,11,2,26,202,250,22,91,2,22,9,248,22,82,
+204,27,248,22,82,248,22,164,4,196,28,248,22,88,193,20,14,144,37,36,37,
+249,22,157,4,80,143,39,36,27,248,22,164,4,248,22,81,197,28,249,22,167,
+9,62,61,62,248,22,158,4,248,22,102,196,250,22,90,2,22,248,22,90,249,
+22,90,21,93,2,27,248,22,81,199,250,22,91,2,11,249,22,90,2,27,249,
+22,90,248,22,111,203,2,27,248,22,82,202,251,22,90,2,18,28,249,22,167,
+9,248,22,158,4,248,22,81,200,64,101,108,115,101,10,248,22,144,18,197,250,
+22,91,2,22,9,248,22,145,18,200,249,22,80,2,11,248,22,82,202,99,13,
 16,6,36,2,14,2,2,11,11,11,8,32,8,31,8,30,8,29,16,4,11,
 11,2,20,3,1,8,101,110,118,49,55,55,48,51,16,4,11,11,2,21,3,
 1,8,101,110,118,49,55,55,48,52,18,143,94,10,64,118,111,105,100,8,48,
-27,248,22,84,248,22,166,4,196,249,22,159,4,80,143,39,36,28,248,22,66,
-248,22,160,4,248,22,83,197,250,22,92,2,28,248,22,92,248,22,146,18,199,
-248,22,104,198,27,248,22,160,4,248,22,146,18,197,250,22,92,2,28,248,22,
-92,248,22,83,197,250,22,93,2,25,248,22,147,18,199,248,22,147,18,202,144,
+27,248,22,82,248,22,164,4,196,249,22,157,4,80,143,39,36,28,248,22,64,
+248,22,158,4,248,22,81,197,250,22,90,2,28,248,22,90,248,22,144,18,199,
+248,22,102,198,27,248,22,158,4,248,22,144,18,197,250,22,90,2,28,248,22,
+90,248,22,81,197,250,22,91,2,25,248,22,145,18,199,248,22,145,18,202,144,
 36,20,114,144,36,16,1,11,16,0,20,26,15,58,9,2,1,2,1,2,2,
 11,9,9,11,11,11,10,36,80,143,36,36,20,114,144,36,16,0,16,0,38,
 39,36,16,0,36,16,0,36,11,11,11,16,10,2,3,2,4,2,5,2,6,
@@ -100,7 +100,7 @@
     EVAL_ONE_SIZED_STR((char *)expr, 2051);
   }
   {
-    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,54,46,48,46,49,46,50,84,0,0,0,0,0,0,0,0,0,0,
+    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,54,46,48,46,49,46,51,84,0,0,0,0,0,0,0,0,0,0,
 0,0,0,0,0,0,0,0,0,0,187,0,0,0,1,0,0,8,0,21,0,
 26,0,43,0,55,0,77,0,106,0,150,0,156,0,165,0,172,0,187,0,205,
 0,217,0,233,0,247,0,13,1,32,1,39,1,73,1,90,1,107,1,130,1,
@@ -180,748 +180,748 @@
 109,101,110,116,32,101,109,112,116,121,6,10,10,103,105,118,101,110,32,112,97,
 116,104,66,102,105,110,105,115,104,5,1,95,5,11,80,76,84,67,79,76,76,
 69,67,84,83,1,20,99,111,108,108,101,99,116,115,45,115,101,97,114,99,104,
-45,100,105,114,115,6,8,8,99,111,108,108,101,99,116,115,27,248,22,162,15,
-194,28,192,192,28,248,22,153,7,194,27,248,22,185,15,195,28,192,192,248,22,
-186,15,195,11,0,21,35,114,120,34,94,91,92,92,93,91,92,92,93,91,63,
+45,100,105,114,115,6,8,8,99,111,108,108,101,99,116,115,27,248,22,160,15,
+194,28,192,192,28,248,22,151,7,194,27,248,22,183,15,195,28,192,192,248,22,
+184,15,195,11,0,21,35,114,120,34,94,91,92,92,93,91,92,92,93,91,63,
 93,91,92,92,93,34,0,6,35,114,120,34,47,34,0,22,35,114,120,34,91,
 47,92,92,93,91,46,32,93,43,91,47,92,92,93,42,36,34,0,19,35,114,
 120,34,91,32,46,93,43,40,91,47,92,92,93,42,41,36,34,86,94,28,28,
-248,22,163,15,23,195,2,10,28,248,22,162,15,23,195,2,10,28,248,22,153,
-7,23,195,2,28,248,22,185,15,23,195,2,10,248,22,186,15,23,195,2,11,
-12,250,22,178,11,2,41,2,42,23,197,2,28,28,248,22,163,15,23,195,2,
-249,22,169,9,248,22,164,15,23,197,2,2,43,249,22,169,9,247,22,180,8,
-2,43,27,28,248,22,153,7,23,196,2,23,195,2,248,22,165,8,248,22,167,
-15,23,197,2,28,249,22,158,16,2,78,23,195,2,28,248,22,153,7,195,248,
-22,170,15,195,194,27,248,22,128,8,23,195,1,249,22,171,15,248,22,168,8,
-250,22,166,16,2,79,28,249,22,158,16,2,80,23,201,2,23,199,1,250,22,
-166,16,2,81,23,202,1,2,44,80,144,44,37,38,2,43,28,248,22,153,7,
-194,248,22,170,15,194,193,0,28,35,114,120,34,94,92,92,92,92,92,92,92,
+248,22,161,15,23,195,2,10,28,248,22,160,15,23,195,2,10,28,248,22,151,
+7,23,195,2,28,248,22,183,15,23,195,2,10,248,22,184,15,23,195,2,11,
+12,250,22,176,11,2,41,2,42,23,197,2,28,28,248,22,161,15,23,195,2,
+249,22,167,9,248,22,162,15,23,197,2,2,43,249,22,167,9,247,22,178,8,
+2,43,27,28,248,22,151,7,23,196,2,23,195,2,248,22,163,8,248,22,165,
+15,23,197,2,28,249,22,156,16,2,78,23,195,2,28,248,22,151,7,195,248,
+22,168,15,195,194,27,248,22,190,7,23,195,1,249,22,169,15,248,22,166,8,
+250,22,164,16,2,79,28,249,22,156,16,2,80,23,201,2,23,199,1,250,22,
+164,16,2,81,23,202,1,2,44,80,144,44,37,38,2,43,28,248,22,151,7,
+194,248,22,168,15,194,193,0,28,35,114,120,34,94,92,92,92,92,92,92,92,
 92,91,63,93,92,92,92,92,85,78,67,92,92,92,92,34,86,95,28,28,28,
-248,22,162,15,23,195,2,10,28,248,22,153,7,23,195,2,28,248,22,185,15,
-23,195,2,10,248,22,186,15,23,195,2,11,10,248,22,163,15,23,195,2,12,
-252,22,178,11,2,5,2,45,36,23,199,2,23,200,2,28,28,28,248,22,162,
-15,23,196,2,10,28,248,22,153,7,23,196,2,28,248,22,185,15,23,196,2,
-10,248,22,186,15,23,196,2,11,10,248,22,163,15,23,196,2,12,252,22,178,
-11,2,5,2,45,37,23,199,2,23,200,2,27,28,248,22,163,15,23,196,2,
-248,22,164,15,23,196,2,247,22,165,15,86,95,28,28,248,22,187,15,23,196,
-2,10,249,22,169,9,247,22,165,15,23,195,2,12,253,22,180,11,2,5,6,
+248,22,160,15,23,195,2,10,28,248,22,151,7,23,195,2,28,248,22,183,15,
+23,195,2,10,248,22,184,15,23,195,2,11,10,248,22,161,15,23,195,2,12,
+252,22,176,11,2,5,2,45,36,23,199,2,23,200,2,28,28,28,248,22,160,
+15,23,196,2,10,28,248,22,151,7,23,196,2,28,248,22,183,15,23,196,2,
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+248,22,88,23,194,2,9,27,248,80,144,44,53,39,248,22,81,23,196,2,28,
+23,193,2,249,22,80,248,22,188,15,249,22,186,15,23,198,1,247,22,138,16,
+248,80,144,46,8,51,39,248,22,82,23,198,1,86,94,23,193,1,248,80,144,
+44,8,51,39,248,22,82,23,196,1,86,94,23,193,1,27,248,22,82,23,196,
+1,28,248,22,88,23,194,2,9,27,248,80,144,42,53,39,248,22,81,23,196,
+2,28,23,193,2,249,22,80,248,22,188,15,249,22,186,15,23,198,1,247,22,
+138,16,248,80,144,44,8,51,39,248,22,82,23,198,1,86,94,23,193,1,248,
+80,144,42,8,51,39,248,22,82,23,196,1,27,247,22,144,16,27,248,80,144,
 39,55,39,247,80,144,39,54,39,249,80,144,40,41,38,28,23,196,2,27,249,
-22,175,8,247,22,174,8,2,74,28,192,249,22,165,8,194,7,63,2,66,2,
-66,250,80,144,43,59,39,23,198,2,2,75,27,28,23,200,1,250,22,180,15,
-248,22,139,16,2,61,250,22,160,2,23,205,1,2,59,247,22,171,8,2,76,
-86,94,23,199,1,11,27,248,80,144,46,8,48,39,250,22,96,9,248,22,92,
-248,22,139,16,2,55,9,28,193,249,22,82,195,194,192,27,247,22,146,16,27,
+22,173,8,247,22,172,8,2,74,28,192,249,22,163,8,194,7,63,2,66,2,
+66,250,80,144,43,59,39,23,198,2,2,75,27,28,23,200,1,250,22,178,15,
+248,22,137,16,2,61,250,22,158,2,23,205,1,2,59,247,22,169,8,2,76,
+86,94,23,199,1,11,27,248,80,144,46,8,48,39,250,22,94,9,248,22,90,
+248,22,137,16,2,55,9,28,193,249,22,80,195,194,192,27,247,22,144,16,27,
 248,80,144,39,55,39,247,80,144,39,54,39,249,80,144,40,41,38,28,23,196,
-2,27,249,22,175,8,247,22,174,8,2,74,28,192,249,22,165,8,194,7,63,
+2,27,249,22,173,8,247,22,172,8,2,74,28,192,249,22,163,8,194,7,63,
 2,66,2,66,250,80,144,43,59,39,23,198,2,2,75,27,28,23,200,1,250,
-22,180,15,248,22,139,16,2,61,250,22,160,2,23,205,1,2,59,247,22,171,
-8,2,76,86,94,23,199,1,11,27,248,80,144,46,8,49,39,250,22,96,23,
-207,1,248,22,92,248,22,139,16,2,55,9,28,193,249,22,82,195,194,192,27,
-247,22,146,16,27,248,80,144,39,55,39,249,80,144,41,52,37,37,80,144,41,
-8,50,39,249,80,144,40,41,38,28,23,196,2,27,249,22,175,8,247,22,174,
-8,2,74,28,192,249,22,165,8,194,7,63,2,66,2,66,250,80,144,43,59,
-39,23,198,2,2,75,27,28,23,200,1,250,22,180,15,248,22,139,16,2,61,
-250,22,160,2,23,205,1,2,59,247,22,171,8,2,76,86,94,23,199,1,11,
-27,27,250,22,96,23,207,1,248,22,92,248,22,139,16,2,55,23,208,1,28,
-248,22,90,23,194,2,9,27,27,248,22,83,23,196,2,28,248,22,187,15,23,
-194,2,248,22,190,15,23,194,1,28,248,22,186,15,23,194,2,90,144,39,11,
-89,146,39,36,11,248,22,183,15,249,22,188,15,27,248,22,139,16,2,56,250,
-80,144,58,40,39,23,196,1,11,11,248,22,139,16,2,57,86,95,23,195,1,
-23,194,1,248,22,190,15,249,22,188,15,23,199,1,23,196,1,27,250,80,144,
-52,40,39,248,22,139,16,2,56,23,197,1,10,28,23,193,2,248,22,190,15,
-23,194,1,11,28,23,193,2,249,22,82,248,22,190,15,249,22,188,15,23,198,
-1,247,22,140,16,27,248,22,84,23,198,1,28,248,22,90,23,194,2,9,27,
-248,80,144,52,53,39,248,22,83,23,196,2,28,23,193,2,249,22,82,248,22,
-190,15,249,22,188,15,23,198,1,247,22,140,16,248,80,144,54,8,51,39,248,
-22,84,23,198,1,86,94,23,193,1,248,80,144,52,8,51,39,248,22,84,23,
-196,1,86,94,23,193,1,27,248,22,84,23,196,1,28,248,22,90,23,194,2,
-9,27,248,80,144,50,53,39,248,22,83,23,196,2,28,23,193,2,249,22,82,
-248,22,190,15,249,22,188,15,23,198,1,247,22,140,16,248,80,144,52,8,51,
-39,248,22,84,23,198,1,86,94,23,193,1,248,80,144,50,8,51,39,248,22,
-84,23,196,1,28,193,249,22,82,195,194,192,27,20,13,144,80,144,37,43,37,
-26,9,80,144,46,44,37,249,22,33,11,80,144,48,43,37,22,136,15,10,22,
-143,15,10,22,144,15,10,22,145,15,10,248,22,148,6,23,196,2,28,248,22,
-148,7,23,194,2,12,86,94,248,22,177,9,23,194,1,27,20,13,144,80,144,
-38,43,37,26,9,80,144,47,44,37,249,22,33,11,80,144,49,43,37,22,136,
-15,10,22,143,15,10,22,144,15,10,22,145,15,10,248,22,148,6,23,197,2,
-28,248,22,148,7,23,194,2,12,86,94,248,22,177,9,23,194,1,27,20,13,
+22,178,15,248,22,137,16,2,61,250,22,158,2,23,205,1,2,59,247,22,169,
+8,2,76,86,94,23,199,1,11,27,248,80,144,46,8,49,39,250,22,94,23,
+207,1,248,22,90,248,22,137,16,2,55,9,28,193,249,22,80,195,194,192,27,
+247,22,144,16,27,248,80,144,39,55,39,249,80,144,41,52,37,37,80,144,41,
+8,50,39,249,80,144,40,41,38,28,23,196,2,27,249,22,173,8,247,22,172,
+8,2,74,28,192,249,22,163,8,194,7,63,2,66,2,66,250,80,144,43,59,
+39,23,198,2,2,75,27,28,23,200,1,250,22,178,15,248,22,137,16,2,61,
+250,22,158,2,23,205,1,2,59,247,22,169,8,2,76,86,94,23,199,1,11,
+27,27,250,22,94,23,207,1,248,22,90,248,22,137,16,2,55,23,208,1,28,
+248,22,88,23,194,2,9,27,27,248,22,81,23,196,2,28,248,22,185,15,23,
+194,2,248,22,188,15,23,194,1,28,248,22,184,15,23,194,2,90,144,39,11,
+89,146,39,36,11,248,22,181,15,249,22,186,15,27,248,22,137,16,2,56,250,
+80,144,58,40,39,23,196,1,11,11,248,22,137,16,2,57,86,95,23,195,1,
+23,194,1,248,22,188,15,249,22,186,15,23,199,1,23,196,1,27,250,80,144,
+52,40,39,248,22,137,16,2,56,23,197,1,10,28,23,193,2,248,22,188,15,
+23,194,1,11,28,23,193,2,249,22,80,248,22,188,15,249,22,186,15,23,198,
+1,247,22,138,16,27,248,22,82,23,198,1,28,248,22,88,23,194,2,9,27,
+248,80,144,52,53,39,248,22,81,23,196,2,28,23,193,2,249,22,80,248,22,
+188,15,249,22,186,15,23,198,1,247,22,138,16,248,80,144,54,8,51,39,248,
+22,82,23,198,1,86,94,23,193,1,248,80,144,52,8,51,39,248,22,82,23,
+196,1,86,94,23,193,1,27,248,22,82,23,196,1,28,248,22,88,23,194,2,
+9,27,248,80,144,50,53,39,248,22,81,23,196,2,28,23,193,2,249,22,80,
+248,22,188,15,249,22,186,15,23,198,1,247,22,138,16,248,80,144,52,8,51,
+39,248,22,82,23,198,1,86,94,23,193,1,248,80,144,50,8,51,39,248,22,
+82,23,196,1,28,193,249,22,80,195,194,192,27,20,13,144,80,144,37,43,37,
+26,9,80,144,46,44,37,249,22,33,11,80,144,48,43,37,22,134,15,10,22,
+141,15,10,22,142,15,10,22,143,15,10,248,22,146,6,23,196,2,28,248,22,
+146,7,23,194,2,12,86,94,248,22,175,9,23,194,1,27,20,13,144,80,144,
+38,43,37,26,9,80,144,47,44,37,249,22,33,11,80,144,49,43,37,22,134,
+15,10,22,141,15,10,22,142,15,10,22,143,15,10,248,22,146,6,23,197,2,
+28,248,22,146,7,23,194,2,12,86,94,248,22,175,9,23,194,1,27,20,13,
 144,80,144,39,43,37,26,9,80,144,48,44,37,249,22,33,11,80,144,50,43,
-37,22,136,15,10,22,143,15,10,22,144,15,10,22,145,15,10,248,22,148,6,
-23,198,2,28,248,22,148,7,23,194,2,12,86,94,248,22,177,9,23,194,1,
-248,80,144,40,8,52,39,197,86,94,249,22,139,7,247,22,173,5,23,196,2,
-248,22,163,6,249,22,138,4,36,249,22,186,3,23,198,1,23,199,1,27,28,
+37,22,134,15,10,22,141,15,10,22,142,15,10,22,143,15,10,248,22,146,6,
+23,198,2,28,248,22,146,7,23,194,2,12,86,94,248,22,175,9,23,194,1,
+248,80,144,40,8,52,39,197,86,94,249,22,137,7,247,22,171,5,23,196,2,
+248,22,161,6,249,22,136,4,36,249,22,184,3,23,198,1,23,199,1,27,28,
 23,197,2,86,95,23,196,1,23,195,1,23,197,1,86,94,23,197,1,27,248,
-22,139,16,2,56,27,250,80,144,42,40,39,23,197,1,11,11,27,248,22,141,
+22,137,16,2,56,27,250,80,144,42,40,39,23,197,1,11,11,27,248,22,139,
 4,23,199,1,27,28,23,194,2,23,194,1,86,94,23,194,1,36,27,248,22,
-141,4,23,202,1,27,28,23,194,2,23,194,1,86,94,23,194,1,36,249,22,
-140,6,23,199,1,20,20,95,88,148,8,36,36,48,11,9,224,4,2,33,185,
-2,23,195,1,23,197,1,27,248,22,189,5,23,195,1,248,80,144,39,8,52,
+139,4,23,202,1,27,28,23,194,2,23,194,1,86,94,23,194,1,36,249,22,
+138,6,23,199,1,20,20,95,88,148,8,36,36,48,11,9,224,4,2,33,185,
+2,23,195,1,23,197,1,27,248,22,187,5,23,195,1,248,80,144,39,8,52,
 39,193,144,36,20,114,144,36,16,1,11,16,0,20,26,15,53,9,2,1,2,
 1,29,11,11,11,11,9,9,11,11,11,10,43,80,143,36,36,20,114,144,50,
 16,39,2,2,2,3,2,4,2,5,2,6,2,7,2,8,30,2,11,1,20,
@@ -942,13 +942,13 @@
 2,7,2,36,2,2,2,5,53,53,37,12,11,11,16,0,16,0,16,0,36,
 36,11,12,11,11,16,0,16,0,16,0,36,36,16,49,20,15,16,2,32,0,
 88,148,8,36,37,45,11,2,2,222,33,77,80,144,36,36,37,20,15,16,2,
-249,22,155,7,7,92,7,92,80,144,36,37,37,20,15,16,2,88,148,8,36,
+249,22,153,7,7,92,7,92,80,144,36,37,37,20,15,16,2,88,148,8,36,
 37,54,38,2,4,223,0,33,82,80,144,36,38,37,20,15,16,2,88,148,8,
 36,38,58,38,2,5,223,0,33,84,80,144,36,39,37,20,15,16,2,20,25,
 96,2,6,88,148,8,36,39,8,24,8,32,9,223,0,33,91,88,148,8,36,
 38,47,52,9,223,0,33,92,88,148,8,36,37,46,52,9,223,0,33,93,80,
-144,36,40,37,20,15,16,2,27,248,22,150,16,248,22,167,8,27,28,249,22,
-169,9,247,22,180,8,2,43,6,1,1,59,6,1,1,58,250,22,137,8,6,
+144,36,40,37,20,15,16,2,27,248,22,148,16,248,22,165,8,27,28,249,22,
+167,9,247,22,178,8,2,43,6,1,1,59,6,1,1,58,250,22,135,8,6,
 14,14,40,91,94,126,97,93,42,41,126,97,40,46,42,41,23,196,2,23,196,
 1,88,148,8,36,38,48,11,2,7,223,0,33,97,80,144,36,41,37,20,15,
 16,2,88,148,36,37,8,38,8,128,6,2,8,223,0,33,98,80,144,36,42,
@@ -977,7 +977,7 @@
 33,120,80,144,36,59,37,20,15,16,2,88,148,36,36,53,52,9,223,0,33,
 121,80,144,36,8,44,39,20,15,16,2,88,148,8,36,36,54,16,4,8,240,
 0,128,0,0,8,137,2,8,128,64,36,2,27,223,0,33,122,80,144,36,8,
-24,37,20,15,16,2,247,22,142,2,80,144,36,8,25,37,20,15,16,2,248,
+24,37,20,15,16,2,247,22,140,2,80,144,36,8,25,37,20,15,16,2,248,
 22,18,65,115,116,97,109,112,80,144,36,8,26,37,20,15,16,2,88,148,36,
 37,46,8,240,0,0,0,4,9,223,0,33,124,80,144,36,8,45,39,20,15,
 16,2,88,148,36,38,48,16,4,36,8,128,80,8,128,128,36,2,30,223,0,
@@ -1017,7 +1017,7 @@
     EVAL_ONE_SIZED_STR((char *)expr, 19187);
   }
   {
-    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,54,46,48,46,49,46,50,84,0,0,0,0,0,0,0,0,0,0,
+    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,54,46,48,46,49,46,51,84,0,0,0,0,0,0,0,0,0,0,
 0,0,0,0,0,0,0,0,0,0,14,0,0,0,1,0,0,15,0,40,0,
 57,0,75,0,97,0,120,0,140,0,162,0,171,0,180,0,187,0,196,0,203,
 0,0,0,231,1,0,0,74,35,37,112,108,97,99,101,45,115,116,114,117,99,
@@ -1036,8 +1036,8 @@
 36,16,2,2,5,2,6,38,11,11,11,16,5,2,3,2,7,2,8,2,4,
 2,2,16,5,11,11,11,11,11,16,5,2,3,2,7,2,8,2,4,2,2,
 41,41,37,12,11,11,16,0,16,0,16,0,36,36,11,12,11,11,16,0,16,
-0,16,0,36,36,16,3,20,15,16,6,253,22,187,10,2,3,11,38,36,11,
-248,22,92,249,22,82,22,174,10,88,148,36,37,45,44,9,223,9,33,9,80,
+0,16,0,36,36,16,3,20,15,16,6,253,22,185,10,2,3,11,38,36,11,
+248,22,90,249,22,80,22,172,10,88,148,36,37,45,44,9,223,9,33,9,80,
 144,36,36,37,80,144,36,37,37,80,144,36,38,37,80,144,36,39,37,80,144,
 36,40,37,20,15,16,2,20,27,143,88,148,36,37,45,44,9,223,0,33,10,
 88,148,36,37,45,44,9,223,0,33,11,80,144,36,41,37,20,15,16,2,20,
@@ -1047,7 +1047,7 @@
     EVAL_ONE_SIZED_STR((char *)expr, 557);
   }
   {
-    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,54,46,48,46,49,46,50,84,0,0,0,0,0,0,0,0,0,0,
+    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,54,46,48,46,49,46,51,84,0,0,0,0,0,0,0,0,0,0,
 0,0,0,0,0,0,0,0,0,0,106,0,0,0,1,0,0,7,0,18,0,
 45,0,51,0,60,0,67,0,89,0,102,0,128,0,145,0,167,0,175,0,187,
 0,202,0,218,0,236,0,0,1,12,1,28,1,51,1,75,1,87,1,118,1,
@@ -1083,396 +1083,396 @@
 112,64,108,111,111,112,63,108,105,98,6,12,12,109,111,100,117,108,101,45,112,
 97,116,104,63,66,115,117,98,109,111,100,6,2,2,46,46,6,1,1,46,64,
 102,105,108,101,66,112,108,97,110,101,116,6,8,8,109,97,105,110,46,114,107,
-116,6,4,4,46,114,107,116,67,105,103,110,111,114,101,100,250,22,180,15,28,
-249,22,169,9,23,201,2,2,29,86,94,23,199,1,23,197,1,28,248,22,185,
-15,23,200,2,249,22,180,15,23,199,1,23,201,1,249,80,144,43,42,39,23,
+116,6,4,4,46,114,107,116,67,105,103,110,111,114,101,100,250,22,178,15,28,
+249,22,167,9,23,201,2,2,29,86,94,23,199,1,23,197,1,28,248,22,183,
+15,23,200,2,249,22,178,15,23,199,1,23,201,1,249,80,144,43,42,39,23,
 199,1,23,201,1,23,200,1,249,80,144,43,43,39,23,198,1,2,30,250,22,
-180,15,28,249,22,169,9,23,201,2,2,29,86,94,23,199,1,23,197,1,28,
-248,22,185,15,23,200,2,249,22,180,15,23,199,1,23,201,1,249,80,144,43,
+178,15,28,249,22,167,9,23,201,2,2,29,86,94,23,199,1,23,197,1,28,
+248,22,183,15,23,200,2,249,22,178,15,23,199,1,23,201,1,249,80,144,43,
 42,39,23,199,1,23,201,1,23,200,1,249,80,144,43,43,39,23,198,1,2,
-30,252,22,180,15,28,249,22,169,9,23,203,2,2,29,86,94,23,201,1,23,
-199,1,28,248,22,185,15,23,202,2,249,22,180,15,23,201,1,23,203,1,249,
-80,144,45,42,39,23,201,1,23,203,1,23,202,1,2,31,247,22,181,8,249,
-80,144,45,43,39,23,200,1,80,144,45,36,38,252,22,180,15,28,249,22,169,
-9,23,203,2,2,29,86,94,23,201,1,23,199,1,28,248,22,185,15,23,202,
-2,249,22,180,15,23,201,1,23,203,1,249,80,144,45,42,39,23,201,1,23,
-203,1,23,202,1,2,31,247,22,181,8,249,80,144,45,43,39,23,200,1,80,
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 0,0,8,0,79,115,104,111,119,45,99,111,108,108,101,99,116,105,111,110,45,
-101,114,114,225,2,5,3,33,91,27,28,248,22,80,23,198,2,28,249,22,169,
-9,2,36,248,22,146,18,23,200,2,27,248,22,104,23,199,2,28,28,249,22,
-171,9,23,195,2,2,38,10,249,22,171,9,23,195,2,2,37,86,94,23,193,
-1,28,23,199,2,27,248,22,154,5,23,201,2,28,248,22,80,193,248,22,146,
-18,193,192,250,22,174,11,2,23,6,45,45,110,111,32,98,97,115,101,32,112,
+101,114,114,225,2,5,3,33,91,27,28,248,22,78,23,198,2,28,249,22,167,
+9,2,36,248,22,144,18,23,200,2,27,248,22,102,23,199,2,28,28,249,22,
+169,9,23,195,2,2,38,10,249,22,169,9,23,195,2,2,37,86,94,23,193,
+1,28,23,199,2,27,248,22,152,5,23,201,2,28,248,22,78,193,248,22,144,
+18,193,192,250,22,172,11,2,23,6,45,45,110,111,32,98,97,115,101,32,112,
 97,116,104,32,102,111,114,32,114,101,108,97,116,105,118,101,32,115,117,98,109,
 111,100,117,108,101,32,112,97,116,104,58,32,126,46,115,23,201,2,192,23,197,
-2,23,197,2,27,28,248,22,80,23,199,2,28,249,22,169,9,2,36,248,22,
-146,18,23,201,2,27,28,28,28,249,22,171,9,248,22,104,23,202,2,2,38,
-10,249,22,171,9,248,22,104,23,202,2,2,37,23,200,2,11,27,248,22,154,
-5,23,202,2,27,28,249,22,171,9,248,22,104,23,204,2,2,37,248,22,147,
-18,23,202,1,248,22,106,23,202,1,28,248,22,80,23,195,2,249,2,87,248,
-22,146,18,23,197,2,249,22,96,248,22,147,18,23,199,1,23,197,1,249,2,
-87,23,196,1,23,195,1,249,2,87,2,38,28,249,22,171,9,248,22,104,23,
-204,2,2,37,248,22,147,18,23,202,1,248,22,106,23,202,1,28,248,22,80,
-193,248,22,147,18,193,11,11,11,27,28,248,22,66,23,196,2,27,248,80,144,
-43,48,39,249,22,82,23,199,2,247,22,142,16,28,23,193,2,192,86,94,23,
-193,1,90,144,38,11,89,146,38,36,11,249,80,144,46,54,39,248,22,73,23,
-201,2,11,27,28,248,22,90,23,195,2,2,41,249,22,176,7,23,197,2,2,
-42,251,80,144,49,8,24,39,23,204,1,28,248,22,90,23,199,2,23,199,1,
-86,94,23,199,1,248,22,83,23,199,2,28,248,22,90,23,199,2,86,94,23,
-198,1,9,248,22,147,18,23,199,1,23,197,1,28,248,22,153,7,23,196,2,
+2,23,197,2,27,28,248,22,78,23,199,2,28,249,22,167,9,2,36,248,22,
+144,18,23,201,2,27,28,28,28,249,22,169,9,248,22,102,23,202,2,2,38,
+10,249,22,169,9,248,22,102,23,202,2,2,37,23,200,2,11,27,248,22,152,
+5,23,202,2,27,28,249,22,169,9,248,22,102,23,204,2,2,37,248,22,145,
+18,23,202,1,248,22,104,23,202,1,28,248,22,78,23,195,2,249,2,87,248,
+22,144,18,23,197,2,249,22,94,248,22,145,18,23,199,1,23,197,1,249,2,
+87,23,196,1,23,195,1,249,2,87,2,38,28,249,22,169,9,248,22,102,23,
+204,2,2,37,248,22,145,18,23,202,1,248,22,104,23,202,1,28,248,22,78,
+193,248,22,145,18,193,11,11,11,27,28,248,22,64,23,196,2,27,248,80,144,
+43,48,39,249,22,80,23,199,2,247,22,140,16,28,23,193,2,192,86,94,23,
+193,1,90,144,38,11,89,146,38,36,11,249,80,144,46,54,39,248,22,71,23,
+201,2,11,27,28,248,22,88,23,195,2,2,41,249,22,174,7,23,197,2,2,
+42,251,80,144,49,8,24,39,23,204,1,28,248,22,88,23,199,2,23,199,1,
+86,94,23,199,1,248,22,81,23,199,2,28,248,22,88,23,199,2,86,94,23,
+198,1,9,248,22,145,18,23,199,1,23,197,1,28,248,22,151,7,23,196,2,
 86,94,23,196,1,27,248,80,144,43,8,30,39,23,202,2,27,248,80,144,44,
-48,39,249,22,82,23,200,2,23,197,2,28,23,193,2,192,86,94,23,193,1,
+48,39,249,22,80,23,200,2,23,197,2,28,23,193,2,192,86,94,23,193,1,
 90,144,38,11,89,146,38,36,11,249,80,144,47,54,39,23,201,2,11,250,22,
-1,22,180,15,23,199,1,249,22,96,249,22,2,32,0,88,148,8,36,37,44,
-11,9,222,33,92,23,200,1,248,22,92,248,2,93,23,201,1,28,248,22,162,
-15,23,196,2,86,94,23,196,1,248,80,144,42,8,31,39,248,22,190,15,28,
-248,22,187,15,23,198,2,23,197,2,249,22,188,15,23,199,2,248,80,144,46,
-8,30,39,23,205,2,28,249,22,169,9,248,22,83,23,198,2,2,34,27,248,
-80,144,43,48,39,249,22,82,23,199,2,247,22,142,16,28,23,193,2,192,86,
+1,22,178,15,23,199,1,249,22,94,249,22,2,32,0,88,148,8,36,37,44,
+11,9,222,33,92,23,200,1,248,22,90,248,2,93,23,201,1,28,248,22,160,
+15,23,196,2,86,94,23,196,1,248,80,144,42,8,31,39,248,22,188,15,28,
+248,22,185,15,23,198,2,23,197,2,249,22,186,15,23,199,2,248,80,144,46,
+8,30,39,23,205,2,28,249,22,167,9,248,22,81,23,198,2,2,34,27,248,
+80,144,43,48,39,249,22,80,23,199,2,247,22,140,16,28,23,193,2,192,86,
 94,23,193,1,90,144,39,11,89,146,38,36,11,249,80,144,47,54,39,248,22,
-104,23,202,2,11,89,146,37,38,11,28,248,22,90,248,22,106,23,201,2,28,
-248,22,90,23,194,2,249,22,158,16,2,95,23,196,2,11,10,27,28,23,196,
-2,248,2,93,23,196,2,28,248,22,90,23,195,2,2,41,28,249,22,158,16,
-2,95,23,197,2,248,2,93,23,196,2,249,22,176,7,23,197,2,2,42,27,
-28,23,197,1,86,94,23,196,1,249,22,96,28,248,22,90,248,22,106,23,205,
-2,21,93,6,5,5,109,122,108,105,98,249,22,1,22,96,249,22,2,80,144,
-53,8,32,39,248,22,106,23,208,2,23,197,1,28,248,22,90,23,196,2,86,
-94,23,195,1,248,22,92,23,197,1,86,94,23,196,1,23,195,1,251,80,144,
-51,8,24,39,23,206,1,248,22,83,23,198,2,248,22,147,18,23,198,1,23,
-198,1,28,249,22,169,9,248,22,146,18,23,198,2,2,39,248,80,144,42,8,
-31,39,248,22,190,15,249,22,188,15,248,22,128,16,248,22,104,23,201,2,248,
-80,144,46,8,30,39,23,205,2,12,86,94,28,28,248,22,162,15,23,194,2,
-10,248,22,184,8,23,194,2,12,28,23,201,2,250,22,176,11,67,114,101,113,
-117,105,114,101,249,22,137,8,6,17,17,98,97,100,32,109,111,100,117,108,101,
-32,112,97,116,104,126,97,28,23,198,2,248,22,83,23,199,2,6,0,0,23,
-204,2,250,22,178,11,2,23,2,35,23,198,2,27,28,248,22,184,8,23,195,
-2,249,22,189,8,23,196,2,36,249,22,190,15,248,22,191,15,23,197,2,11,
-27,28,248,22,184,8,23,196,2,249,22,189,8,23,197,2,37,248,80,144,44,
-8,25,39,23,195,2,90,144,39,11,89,146,39,36,11,28,248,22,184,8,23,
-199,2,250,22,7,2,43,249,22,189,8,23,203,2,38,2,43,248,22,183,15,
-23,198,2,86,95,23,195,1,23,193,1,27,28,248,22,184,8,23,200,2,249,
-22,189,8,23,201,2,39,249,80,144,49,59,39,23,197,2,5,0,27,28,248,
-22,184,8,23,201,2,249,22,189,8,23,202,2,40,248,22,153,5,23,200,2,
-27,250,22,160,2,80,144,52,41,38,248,22,179,16,247,22,132,14,11,27,28,
-23,194,2,23,194,1,86,94,23,194,1,27,249,22,82,247,22,140,2,247,22,
-140,2,86,94,250,22,158,2,80,144,54,41,38,248,22,179,16,247,22,132,14,
-195,192,27,28,23,204,2,248,22,153,5,249,22,82,248,22,154,5,23,200,2,
-23,207,2,23,196,2,86,95,28,23,212,1,27,250,22,160,2,248,22,83,23,
+102,23,202,2,11,89,146,37,38,11,28,248,22,88,248,22,104,23,201,2,28,
+248,22,88,23,194,2,249,22,156,16,2,95,23,196,2,11,10,27,28,23,196,
+2,248,2,93,23,196,2,28,248,22,88,23,195,2,2,41,28,249,22,156,16,
+2,95,23,197,2,248,2,93,23,196,2,249,22,174,7,23,197,2,2,42,27,
+28,23,197,1,86,94,23,196,1,249,22,94,28,248,22,88,248,22,104,23,205,
+2,21,93,6,5,5,109,122,108,105,98,249,22,1,22,94,249,22,2,80,144,
+53,8,32,39,248,22,104,23,208,2,23,197,1,28,248,22,88,23,196,2,86,
+94,23,195,1,248,22,90,23,197,1,86,94,23,196,1,23,195,1,251,80,144,
+51,8,24,39,23,206,1,248,22,81,23,198,2,248,22,145,18,23,198,1,23,
+198,1,28,249,22,167,9,248,22,144,18,23,198,2,2,39,248,80,144,42,8,
+31,39,248,22,188,15,249,22,186,15,248,22,190,15,248,22,102,23,201,2,248,
+80,144,46,8,30,39,23,205,2,12,86,94,28,28,248,22,160,15,23,194,2,
+10,248,22,182,8,23,194,2,12,28,23,201,2,250,22,174,11,67,114,101,113,
+117,105,114,101,249,22,135,8,6,17,17,98,97,100,32,109,111,100,117,108,101,
+32,112,97,116,104,126,97,28,23,198,2,248,22,81,23,199,2,6,0,0,23,
+204,2,250,22,176,11,2,23,2,35,23,198,2,27,28,248,22,182,8,23,195,
+2,249,22,187,8,23,196,2,36,249,22,188,15,248,22,189,15,23,197,2,11,
+27,28,248,22,182,8,23,196,2,249,22,187,8,23,197,2,37,248,80,144,44,
+8,25,39,23,195,2,90,144,39,11,89,146,39,36,11,28,248,22,182,8,23,
+199,2,250,22,7,2,43,249,22,187,8,23,203,2,38,2,43,248,22,181,15,
+23,198,2,86,95,23,195,1,23,193,1,27,28,248,22,182,8,23,200,2,249,
+22,187,8,23,201,2,39,249,80,144,49,59,39,23,197,2,5,0,27,28,248,
+22,182,8,23,201,2,249,22,187,8,23,202,2,40,248,22,151,5,23,200,2,
+27,250,22,158,2,80,144,52,41,38,248,22,177,16,247,22,130,14,11,27,28,
+23,194,2,23,194,1,86,94,23,194,1,27,249,22,80,247,22,138,2,247,22,
+138,2,86,94,250,22,156,2,80,144,54,41,38,248,22,177,16,247,22,130,14,
+195,192,27,28,23,204,2,248,22,151,5,249,22,80,248,22,152,5,23,200,2,
+23,207,2,23,196,2,86,95,28,23,212,1,27,250,22,158,2,248,22,81,23,
 199,2,196,11,28,23,193,1,12,27,27,28,248,22,17,80,144,55,51,38,80,
 144,54,51,38,247,22,19,251,22,33,11,80,144,58,50,38,9,23,197,1,27,
-248,22,179,16,247,22,132,14,86,94,249,22,3,20,20,94,88,148,8,36,37,
+248,22,177,16,247,22,130,14,86,94,249,22,3,20,20,94,88,148,8,36,37,
 54,11,9,226,14,13,2,3,33,98,23,195,1,23,196,2,248,28,248,22,17,
 80,144,56,51,38,32,0,88,148,36,37,42,11,9,222,33,99,80,144,55,8,
 33,39,20,20,97,88,148,36,36,8,24,8,240,12,64,0,0,9,232,19,22,
 15,16,13,12,8,7,5,2,33,101,23,195,1,23,198,1,23,208,1,23,215,
-1,12,28,28,248,22,184,8,23,204,1,11,28,248,22,153,7,23,206,2,10,
-28,248,22,66,23,206,2,10,28,248,22,80,23,206,2,249,22,169,9,248,22,
-146,18,23,208,2,2,34,11,249,80,144,53,49,39,28,248,22,153,7,23,208,
-2,249,22,82,23,209,1,248,80,144,56,8,30,39,23,215,1,86,94,23,212,
-1,249,22,82,23,209,1,247,22,142,16,252,22,186,8,23,209,1,23,208,1,
+1,12,28,28,248,22,182,8,23,204,1,11,28,248,22,151,7,23,206,2,10,
+28,248,22,64,23,206,2,10,28,248,22,78,23,206,2,249,22,167,9,248,22,
+144,18,23,208,2,2,34,11,249,80,144,53,49,39,28,248,22,151,7,23,208,
+2,249,22,80,23,209,1,248,80,144,56,8,30,39,23,215,1,86,94,23,212,
+1,249,22,80,23,209,1,247,22,140,16,252,22,184,8,23,209,1,23,208,1,
 23,206,1,23,204,1,23,203,1,12,192,86,96,20,18,144,11,80,143,36,56,
-248,80,144,37,8,28,37,249,22,33,11,80,144,39,58,37,248,22,191,4,80,
-144,37,57,38,248,22,177,5,80,144,37,37,39,248,22,131,15,80,144,37,45,
+248,80,144,37,8,28,37,249,22,33,11,80,144,39,58,37,248,22,189,4,80,
+144,37,57,38,248,22,175,5,80,144,37,37,39,248,22,129,15,80,144,37,45,
 39,20,18,144,11,80,143,36,56,248,80,144,37,8,28,37,249,22,33,11,80,
 144,39,58,37,20,18,144,11,80,143,36,56,248,80,144,37,8,28,37,249,22,
 33,11,80,144,39,58,37,144,36,20,114,144,36,16,1,11,16,0,20,26,15,
@@ -1493,16 +1493,16 @@
 2,10,2,20,2,23,52,11,11,11,16,3,2,25,2,22,2,26,16,3,11,
 11,11,16,3,2,25,2,22,2,26,39,39,37,12,11,11,16,0,16,0,16,
 0,36,36,11,12,11,11,16,0,16,0,16,0,36,36,16,24,20,15,16,2,
-248,22,180,8,69,115,111,45,115,117,102,102,105,120,80,144,36,36,37,20,15,
+248,22,178,8,69,115,111,45,115,117,102,102,105,120,80,144,36,36,37,20,15,
 16,2,88,148,36,38,8,43,8,189,3,2,3,223,0,33,56,80,144,36,37,
 37,20,15,16,2,32,0,88,148,8,36,41,52,11,2,10,222,33,57,80,144,
 36,44,37,20,15,16,2,20,27,143,32,0,88,148,8,36,37,42,11,2,11,
 222,192,32,0,88,148,8,36,37,42,11,2,11,222,192,80,144,36,45,37,20,
-15,16,2,247,22,143,2,80,144,36,41,37,20,15,16,2,8,128,8,80,144,
-36,46,37,20,15,16,2,249,22,185,8,8,128,8,11,80,144,36,47,37,20,
+15,16,2,247,22,141,2,80,144,36,41,37,20,15,16,2,8,128,8,80,144,
+36,46,37,20,15,16,2,249,22,183,8,8,128,8,11,80,144,36,47,37,20,
 15,16,2,88,148,8,36,37,50,8,128,32,2,14,223,0,33,58,80,144,36,
 48,37,20,15,16,2,88,148,8,36,38,55,8,128,32,2,15,223,0,33,59,
-80,144,36,49,37,20,15,16,2,247,22,78,80,144,36,50,37,20,15,16,2,
+80,144,36,49,37,20,15,16,2,247,22,76,80,144,36,50,37,20,15,16,2,
 248,22,18,74,109,111,100,117,108,101,45,108,111,97,100,105,110,103,80,144,36,
 51,37,20,15,16,2,11,80,143,36,52,20,15,16,2,11,80,143,36,53,20,
 15,16,2,32,0,88,148,36,38,57,11,2,20,222,33,78,80,144,36,54,37,
@@ -1529,7 +1529,7 @@
     EVAL_ONE_SIZED_STR((char *)expr, 10046);
   }
   {
-    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,54,46,48,46,49,46,50,84,0,0,0,0,0,0,0,0,0,0,
+    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,54,46,48,46,49,46,51,84,0,0,0,0,0,0,0,0,0,0,
 0,0,0,0,0,0,0,0,0,0,11,0,0,0,1,0,0,10,0,16,0,
 29,0,44,0,58,0,78,0,90,0,104,0,118,0,170,0,0,0,101,1,0,
 0,69,35,37,98,117,105,108,116,105,110,65,113,117,111,116,101,29,94,2,2,
diff --git a/racket/src/racket/src/env.c b/racket/src/racket/src/env.c
index 37d00c7cfd..5c0e178499 100644
--- a/racket/src/racket/src/env.c
+++ b/racket/src/racket/src/env.c
@@ -328,6 +328,7 @@ static void init_unsafe(Scheme_Env *env)
   scheme_init_unsafe_numcomp(unsafe_env);
   scheme_init_unsafe_list(unsafe_env);
   scheme_init_unsafe_vector(unsafe_env);
+  scheme_init_unsafe_fun(unsafe_env);
 
   scheme_init_extfl_unsafe_number(unsafe_env);
   scheme_init_extfl_unsafe_numarith(unsafe_env);
diff --git a/racket/src/racket/src/fun.c b/racket/src/racket/src/fun.c
index 8eb4d06086..6f55a768ea 100644
--- a/racket/src/racket/src/fun.c
+++ b/racket/src/racket/src/fun.c
@@ -93,6 +93,7 @@ READ_ONLY Scheme_Object *scheme_reduced_procedure_struct;
 READ_ONLY Scheme_Object *scheme_tail_call_waiting;
 READ_ONLY Scheme_Object *scheme_inferred_name_symbol;
 READ_ONLY Scheme_Object *scheme_default_prompt_tag;
+READ_ONLY Scheme_Object *scheme_chaperone_undefined_property;
 
 /* READ ONLY SHARABLE GLOBALS */
 
@@ -190,6 +191,7 @@ static Scheme_Object *current_prompt_read(int, Scheme_Object **);
 static Scheme_Object *current_read(int, Scheme_Object **);
 static Scheme_Object *current_get_read_input_port(int, Scheme_Object **);
 
+static Scheme_Object *chaperone_not_undefined (int argc, Scheme_Object *argv[]);
 
 static Scheme_Object *chaperone_wrap_cc_guard(Scheme_Object *obj, Scheme_Object *proc);
 static Scheme_Object *do_cc_guard(Scheme_Object *v, Scheme_Object *cc_guard, Scheme_Object *chaperone);
@@ -491,16 +493,6 @@ scheme_init_fun (Scheme_Env *env)
                                                             | SCHEME_PRIM_IS_OMITABLE);
   scheme_add_global_constant("void?", o, env);
 
-  /* adds the new primitive check-undefined to the kernel langauge
-     check-undefined has an arity of 1 and no flags */
-  REGISTER_SO(scheme_check_not_undefined_proc);
-  o = scheme_make_prim_w_arity(scheme_check_not_undefined, "check-not-undefined", 2, 2);
-  scheme_check_not_undefined_proc = o;
-  SCHEME_PRIM_PROC_FLAGS(o) |= scheme_intern_prim_opt_flags(SCHEME_PRIM_IS_BINARY_INLINED);
-  scheme_add_global_constant("check-not-undefined", o, env);
-
-  scheme_add_global_constant("undefined", scheme_undefined, env);
-
 #ifdef TIME_SYNTAX
   scheme_add_global_constant("time-apply",
 			     scheme_make_prim_w_arity2(time_apply,
@@ -677,6 +669,25 @@ scheme_init_fun (Scheme_Env *env)
   original_default_prompt->tag = scheme_default_prompt_tag;
 }
 
+void
+scheme_init_unsafe_fun (Scheme_Env *env)
+{
+  Scheme_Object *o, *a[1];
+
+  REGISTER_SO(scheme_check_not_undefined_proc);
+  o = scheme_make_prim_w_arity(scheme_check_not_undefined, "check-not-unsafe-undefined", 2, 2);
+  scheme_check_not_undefined_proc = o;
+  SCHEME_PRIM_PROC_FLAGS(o) |= scheme_intern_prim_opt_flags(SCHEME_PRIM_IS_BINARY_INLINED);
+  scheme_add_global_constant("check-not-unsafe-undefined", o, env);
+
+  scheme_add_global_constant("unsafe-undefined", scheme_undefined, env);
+
+  REGISTER_SO(scheme_chaperone_undefined_property);
+  o = scheme_make_struct_type_property(scheme_intern_symbol("chaperone-unsafe-undefined"));
+  scheme_chaperone_undefined_property = o;
+  scheme_add_global_constant("prop:chaperone-unsafe-undefined", o, env);
+}
+
 void
 scheme_init_fun_places()
 {
@@ -2538,7 +2549,7 @@ Scheme_Object *
 scheme_check_not_undefined (int argc, Scheme_Object *argv[])
 {
   if (!SCHEME_SYMBOLP(argv[1]))
-    scheme_wrong_contract("check-not-undefined", "symbol?", 1, argc, argv);
+    scheme_wrong_contract("check-not-unsafe-undefined", "symbol?", 1, argc, argv);
 
   if (SAME_OBJ(argv[0], scheme_undefined)) {
     scheme_raise_exn(MZEXN_FAIL_CONTRACT_VARIABLE,
@@ -2550,6 +2561,11 @@ scheme_check_not_undefined (int argc, Scheme_Object *argv[])
   return argv[0];
 }
 
+Scheme_Object *
+chaperone_not_undefined (int argc, Scheme_Object *argv[])
+{
+  return scheme_chaperone_not_undefined(argv[0]);
+}
 
 static Scheme_Object *
 procedure_p (int argc, Scheme_Object *argv[])
diff --git a/racket/src/racket/src/jitinline.c b/racket/src/racket/src/jitinline.c
index cbcd3d2d7d..3320094521 100644
--- a/racket/src/racket/src/jitinline.c
+++ b/racket/src/racket/src/jitinline.c
@@ -3527,11 +3527,11 @@ int scheme_generate_inlined_binary(mz_jit_state *jitter, Scheme_App3_Rec *app, i
       jit_movr_p(dest, JIT_R0);
 
       return 1;
-    } else if (IS_NAMED_PRIM(rator, "check-not-undefined")) {
+    } else if (IS_NAMED_PRIM(rator, "check-not-unsafe-undefined")) {
       if (SCHEME_SYMBOLP(app->rand2)) {
         GC_CAN_IGNORE jit_insn *ref, *ref2;
 
-        LOG_IT(("inlined check-not-undefined\n"));
+        LOG_IT(("inlined check-not-unsafe-undefined\n"));
 
         mz_runstack_skipped(jitter, 2);
         scheme_generate_non_tail(app->rand1, jitter, 0, 1, 0); /* no sync... */
diff --git a/racket/src/racket/src/schminc.h b/racket/src/racket/src/schminc.h
index 2dd81674fa..c81b3f37f1 100644
--- a/racket/src/racket/src/schminc.h
+++ b/racket/src/racket/src/schminc.h
@@ -14,8 +14,8 @@
 
 #define USE_COMPILED_STARTUP 1
 
-#define EXPECTED_PRIM_COUNT 1118
-#define EXPECTED_UNSAFE_COUNT 101
+#define EXPECTED_PRIM_COUNT 1116
+#define EXPECTED_UNSAFE_COUNT 104
 #define EXPECTED_FLFXNUM_COUNT 69
 #define EXPECTED_EXTFL_COUNT 45
 #define EXPECTED_FUTURES_COUNT 15
diff --git a/racket/src/racket/src/schpriv.h b/racket/src/racket/src/schpriv.h
index 5f560321b3..2e5310b3a3 100644
--- a/racket/src/racket/src/schpriv.h
+++ b/racket/src/racket/src/schpriv.h
@@ -308,6 +308,7 @@ void scheme_init_promise(Scheme_Env *env);
 void scheme_init_struct(Scheme_Env *env);
 void scheme_init_reduced_proc_struct(Scheme_Env *env);
 void scheme_init_fun(Scheme_Env *env);
+void scheme_init_unsafe_fun(Scheme_Env *env);
 void scheme_init_compile(Scheme_Env *env);
 void scheme_init_symbol(Scheme_Env *env);
 void scheme_init_char(Scheme_Env *env);
@@ -527,6 +528,8 @@ extern Scheme_Object *scheme_app_mark_impersonator_property;
 
 extern Scheme_Object *scheme_no_arity_property;
 
+extern Scheme_Object *scheme_chaperone_undefined_property;
+
 extern Scheme_Object *scheme_reduced_procedure_struct;
 
 /* recycle some constants that can't appear in code: */
@@ -1003,6 +1006,8 @@ Scheme_Object *scheme_chaperone_hash_get(Scheme_Object *table, Scheme_Object *ke
 Scheme_Object *scheme_chaperone_hash_traversal_get(Scheme_Object *table, Scheme_Object *key, Scheme_Object **alt_key);
 void scheme_chaperone_hash_set(Scheme_Object *table, Scheme_Object *key, Scheme_Object *val);
 
+Scheme_Object *scheme_chaperone_not_undefined(Scheme_Object *orig_val);
+
 /*========================================================================*/
 /*                         syntax objects                                 */
 /*========================================================================*/
diff --git a/racket/src/racket/src/schvers.h b/racket/src/racket/src/schvers.h
index 97ddbb1253..6d61210357 100644
--- a/racket/src/racket/src/schvers.h
+++ b/racket/src/racket/src/schvers.h
@@ -13,12 +13,12 @@
    consistently.)
 */
 
-#define MZSCHEME_VERSION "6.0.1.2"
+#define MZSCHEME_VERSION "6.0.1.3"
 
 #define MZSCHEME_VERSION_X 6
 #define MZSCHEME_VERSION_Y 0
 #define MZSCHEME_VERSION_Z 1
-#define MZSCHEME_VERSION_W 2
+#define MZSCHEME_VERSION_W 3
 
 #define MZSCHEME_VERSION_MAJOR ((MZSCHEME_VERSION_X * 100) + MZSCHEME_VERSION_Y)
 #define MZSCHEME_VERSION_MINOR ((MZSCHEME_VERSION_Z * 1000) + MZSCHEME_VERSION_W)
diff --git a/racket/src/racket/src/struct.c b/racket/src/racket/src/struct.c
index 5c7861e52d..cd24ec6c85 100644
--- a/racket/src/racket/src/struct.c
+++ b/racket/src/racket/src/struct.c
@@ -2002,7 +2002,38 @@ static Scheme_Object *chaperone_struct_ref(const char *who, Scheme_Object *o, in
       Scheme_Chaperone *px = (Scheme_Chaperone *)o;
       Scheme_Object *a[2], *red, *orig;
 
-      if (!SCHEME_VECTORP(px->redirects)
+      if (SCHEME_VECTORP(px->redirects)
+          && !(SCHEME_VEC_SIZE(px->redirects) & 1)
+          && SAME_OBJ(SCHEME_VEC_ELS(px->redirects)[1], scheme_undefined)) {
+        /* chaperone on every field: check that result is not undefined */
+        o = px->prev;
+        
+        if (!SCHEME_CHAPERONEP(o))
+          orig = ((Scheme_Structure *)o)->slots[i];
+        else
+          orig = chaperone_struct_ref(who, o, i);
+
+        if (SAME_OBJ(orig, scheme_undefined)) {
+          int len;
+          o = scheme_struct_type_property_ref(scheme_chaperone_undefined_property, px->val);
+          len = (o ? scheme_proper_list_length(o) : 0);
+          if (i < len) {
+            for (i = len - i; --i; ) {
+              o = SCHEME_CDR(o);
+            }
+            o = SCHEME_CAR(o);
+            scheme_raise_exn(MZEXN_FAIL_CONTRACT_VARIABLE,
+                             o,
+                             "%S: field used before its initialization",
+                             o);
+          } else {
+            scheme_raise_exn(MZEXN_FAIL_CONTRACT,
+                             "field used before its initialization");
+          }
+        }
+
+        return orig;
+      } else if (!SCHEME_VECTORP(px->redirects)
           || (SCHEME_VEC_SIZE(px->redirects) & 1)
           || SCHEME_FALSEP(SCHEME_VEC_ELS(px->redirects)[PRE_REDIRECTS + i])) {
         o = px->prev;
@@ -2065,7 +2096,8 @@ static void chaperone_struct_set(const char *who, Scheme_Object *o, int i, Schem
 
       o = px->prev;
       if (SCHEME_VECTORP(px->redirects)
-          && !(SCHEME_VEC_SIZE(px->redirects) & 1)) {
+          && !(SCHEME_VEC_SIZE(px->redirects) & 1)
+          && !SAME_OBJ(SCHEME_VEC_ELS(px->redirects)[1], scheme_undefined)) {
         half = (SCHEME_VEC_SIZE(px->redirects) - PRE_REDIRECTS) >> 1;
         red = SCHEME_VEC_ELS(px->redirects)[PRE_REDIRECTS + half + i];
         if (SCHEME_TRUEP(red)) {
@@ -2102,7 +2134,8 @@ void scheme_struct_set(Scheme_Object *sv, int pos, Scheme_Object *v)
   }
 }
 
-static Scheme_Object **apply_guards(Scheme_Struct_Type *stype, int argc, Scheme_Object **args)
+static Scheme_Object **apply_guards(Scheme_Struct_Type *stype, int argc, Scheme_Object **args,
+                                    int *_chaperone_undefined)
 {
   Scheme_Object **guard_argv = NULL, *v, *prev_guards = NULL, *guard;
   int p, gcount;
@@ -2131,7 +2164,9 @@ static Scheme_Object **apply_guards(Scheme_Struct_Type *stype, int argc, Scheme_
             guard = scheme_false;
         }
 
-        if (!SCHEME_FALSEP(guard)) {
+        if (SAME_OBJ(guard, scheme_undefined))
+          *_chaperone_undefined = 1;
+        else if (!SCHEME_FALSEP(guard)) {
           gcount = stype->parent_types[p]->num_islots;
           guard_argv[argc] = guard_argv[gcount];
           guard_argv[gcount] = stype->name;
@@ -2173,6 +2208,7 @@ scheme_make_struct_instance(Scheme_Object *_stype, int argc, Scheme_Object **arg
   Scheme_Structure *inst;
   Scheme_Struct_Type *stype;
   int p, i, j, nis, ns, c;
+  int chaperone_undefined = 0;
 
   stype = (Scheme_Struct_Type *)_stype;
 
@@ -2185,7 +2221,7 @@ scheme_make_struct_instance(Scheme_Object *_stype, int argc, Scheme_Object **arg
   inst->stype = stype;
 
   /* Apply guards, if any: */
-  args = apply_guards(stype, argc, args);
+  args = apply_guards(stype, argc, args, &chaperone_undefined);
   
   /* Fill in fields: */
   j = c;
@@ -2212,8 +2248,11 @@ scheme_make_struct_instance(Scheme_Object *_stype, int argc, Scheme_Object **arg
       inst->slots[--j] = args[--i];
     }
   }
-  
-  return (Scheme_Object *)inst;
+
+  if (chaperone_undefined)
+    return scheme_chaperone_not_undefined((Scheme_Object *)inst);
+  else
+    return (Scheme_Object *)inst;
 }
 
 Scheme_Object *scheme_make_blank_prefab_struct_instance(Scheme_Struct_Type *stype)
@@ -2609,7 +2648,7 @@ static Scheme_Object *struct_info_chaperone(Scheme_Object *o, Scheme_Object *si,
     if (SCHEME_VECTORP(px->redirects)
         && !(SCHEME_VEC_SIZE(px->redirects) & 1)) {
       proc = SCHEME_VEC_ELS(px->redirects)[1];
-      if (SCHEME_TRUEP(proc)) {
+      if (SCHEME_TRUEP(proc) && !SAME_OBJ(proc, scheme_undefined)) {
         if (SCHEME_CHAPERONE_FLAGS(px) & SCHEME_CHAPERONE_IS_IMPERSONATOR)
           proc = scheme_box(proc);
         procs = scheme_make_pair(proc, procs);
@@ -4289,7 +4328,7 @@ static Scheme_Object *_make_struct_type(Scheme_Object *base,
 					Scheme_Object *guard)
 {
   Scheme_Struct_Type *struct_type, *parent_type;
-  int j, depth, checked_proc = 0;
+  int j, depth, checked_proc = 0, chaperone_undefined = 0;
   
   if (parent && SCHEME_NP_CHAPERONEP(parent))
     parent_type = (Scheme_Struct_Type *)SCHEME_CHAPERONE_VAL(parent);
@@ -4432,6 +4471,8 @@ static Scheme_Object *_make_struct_type(Scheme_Object *base,
 
         if (SAME_OBJ(prop, scheme_checked_proc_property))
           checked_proc = 1;
+        if (SAME_OBJ(prop, scheme_chaperone_undefined_property))
+          chaperone_undefined = 1;
 
         propv = guard_property(prop, SCHEME_CDR(a), struct_type);
         
@@ -4489,6 +4530,8 @@ static Scheme_Object *_make_struct_type(Scheme_Object *base,
 
         if (SAME_OBJ(prop, scheme_checked_proc_property))
           checked_proc = 1;
+        if (SAME_OBJ(prop, scheme_chaperone_undefined_property))
+          chaperone_undefined = 1;
 
         propv = guard_property(prop, SCHEME_CDR(a), struct_type);
 
@@ -4554,6 +4597,8 @@ static Scheme_Object *_make_struct_type(Scheme_Object *base,
     }
     
     struct_type->guard = guard;
+  } else if (chaperone_undefined) {
+    struct_type->guard = scheme_undefined;
   }
 
   if (parent && SCHEME_NP_CHAPERONEP(parent)) {
@@ -5666,6 +5711,40 @@ static Scheme_Object *impersonate_struct(int argc, Scheme_Object **argv)
   return do_chaperone_struct("impersonate-struct", 1, argc, argv);
 }
 
+
+Scheme_Object *scheme_chaperone_not_undefined (Scheme_Object *orig_val)
+{
+  Scheme_Chaperone *px;
+  Scheme_Object *val, *redirects;
+  Scheme_Hash_Tree *props;
+
+  val = orig_val;
+
+  if (SCHEME_CHAPERONEP(val)) {
+    props = ((Scheme_Chaperone *)val)->props;
+    val = SCHEME_CHAPERONE_VAL(val);
+  } else
+    props = NULL;
+
+  redirects = scheme_make_vector(PRE_REDIRECTS, scheme_false);
+
+  SCHEME_VEC_ELS(redirects)[0] = scheme_false;
+  SCHEME_VEC_ELS(redirects)[1] = scheme_undefined; /* special handing in struct_ref */
+
+  px = MALLOC_ONE_TAGGED(Scheme_Chaperone);
+  if (SCHEME_PROCP(val))
+    px->iso.so.type = scheme_proc_chaperone_type;
+  else
+    px->iso.so.type = scheme_chaperone_type;
+  px->val = val;
+  px->prev = orig_val;
+  px->props = props;
+  px->redirects = redirects;
+
+  return (Scheme_Object *)px;
+}
+
+
 static Scheme_Object *do_chaperone_struct_type(const char *name, int is_impersonator, int argc, Scheme_Object **argv)
 {
   Scheme_Chaperone *px;
diff --git a/racket/src/racket/src/type.c b/racket/src/racket/src/type.c
index ae0868fb18..ef05c325f4 100644
--- a/racket/src/racket/src/type.c
+++ b/racket/src/racket/src/type.c
@@ -163,7 +163,7 @@ scheme_init_type ()
   set_name(scheme_double_type, "<inexact-number>");
   set_name(scheme_long_double_type, "<extflonum>");
   set_name(scheme_float_type, "<inexact-number*>");
-  set_name(scheme_undefined_type, "<undefined>");
+  set_name(scheme_undefined_type, "<unsafe-undefined>");
   set_name(scheme_eof_type, "<eof>");
   set_name(scheme_input_port_type, "<input-port>");
   set_name(scheme_output_port_type, "<output-port>");