From 72c958df628690ebc52a626d35cd4edcab0c7089 Mon Sep 17 00:00:00 2001
From: Claire Alvis <claire.alvis@gmail.com>
Date: Tue, 7 May 2013 09:36:47 -0400
Subject: [PATCH] all necessary changes to check references to uninitialized
 letrec variables

includes a new pass, letrec_check, two new primitives, and
changes to packages that grabbed the letrec undefined value
---
 pkgs/algol60/runtime.rkt                      |    2 +-
 .../compatibility-lib/mzlib/unit200.rkt       |    3 +-
 .../htdp-pkgs/htdp-lib/lang/private/teach.rkt |   20 +-
 pkgs/pconvert-lib/mzlib/pconvert.rkt          |    9 +-
 pkgs/plai/datatype.rkt                        |    8 +-
 pkgs/r5rs-pkgs/r5rs-lib/r5rs/main.rkt         |    2 +-
 .../scribblings/reference/data.scrbl          |   28 +-
 .../racket-test/tests/racket/optimize.rktl    |    3 +
 .../racket-test/tests/racket/syntax.rktl      |   14 +-
 pkgs/swindle/tiny-clos.rkt                    |    5 +-
 .../typed-racket/types/abbrev.rkt             |    5 +-
 .../typed-racket/utils/any-wrap.rkt           |    5 +-
 .../collects/racket/contract/private/misc.rkt |   13 +-
 .../collects/racket/private/class-c-old.rkt   |    3 +-
 .../racket/private/class-internal.rkt         |    3 +-
 racket/collects/racket/private/classidmap.rkt |    5 +-
 racket/collects/racket/private/pre-base.rkt   |    3 +-
 .../collects/racket/private/unit-runtime.rkt  |    5 +-
 racket/collects/racket/shared.rkt             |    4 +-
 racket/collects/racket/undefined.rkt          |   10 +-
 racket/collects/racket/unit.rkt               |    4 +-
 racket/collects/syntax/toplevel.rkt           |    6 +-
 racket/src/racket/gc2/Makefile.in             |    6 +
 racket/src/racket/src/Makefile.in             |    6 +
 racket/src/racket/src/compenv.c               |   11 +-
 racket/src/racket/src/compile.c               |   39 +-
 racket/src/racket/src/cstartup.inc            | 2096 ++++++++---------
 racket/src/racket/src/env.c                   |    1 +
 racket/src/racket/src/eval.c                  |    2 +
 racket/src/racket/src/fun.c                   |   27 +
 racket/src/racket/src/letrec_check.c          | 1854 +++++++++++++++
 racket/src/racket/src/mkmark.rkt              |    6 +-
 racket/src/racket/src/module.c                |    6 +-
 racket/src/racket/src/mzmark_letrec_check.inc |   78 +
 racket/src/racket/src/mzmark_type.inc         |    8 +
 racket/src/racket/src/mzmarksrc.c             |   38 +
 racket/src/racket/src/optimize.c              |   21 +-
 racket/src/racket/src/print.c                 |    1 +
 racket/src/racket/src/schminc.h               |    2 +-
 racket/src/racket/src/schpriv.h               |    7 +
 racket/src/racket/src/schvers.h               |    4 +-
 racket/src/racket/src/stypes.h                |    2 +
 42 files changed, 3225 insertions(+), 1150 deletions(-)
 create mode 100644 racket/src/racket/src/letrec_check.c
 create mode 100644 racket/src/racket/src/mzmark_letrec_check.inc

diff --git a/pkgs/algol60/runtime.rkt b/pkgs/algol60/runtime.rkt
index ab813a810a..7e88cce853 100644
--- a/pkgs/algol60/runtime.rkt
+++ b/pkgs/algol60/runtime.rkt
@@ -1,4 +1,5 @@
 (module runtime mzscheme
+  (require racket/undefined)
   
   (provide (struct a60:array (vec dimens))
            (struct a60:switch (choices))
@@ -17,7 +18,6 @@
   (define-struct a60:array (vec dimens))
   (define-struct a60:switch (choices))
   
-  (define undefined (letrec ([x x]) x))
   (define (check-boolean b) b)
   (define (goto f) (f))
   (define (get-value v) (v))
diff --git a/pkgs/compatibility-pkgs/compatibility-lib/mzlib/unit200.rkt b/pkgs/compatibility-pkgs/compatibility-lib/mzlib/unit200.rkt
index d1dd8ec122..29f4968657 100644
--- a/pkgs/compatibility-pkgs/compatibility-lib/mzlib/unit200.rkt
+++ b/pkgs/compatibility-pkgs/compatibility-lib/mzlib/unit200.rkt
@@ -7,14 +7,13 @@
 		      syntax/name
 		      syntax/context
                       racket/syntax
+                      racket/undefined
 		      (only racket/base filter)
 		      "private/unitidmap.rkt")
 
   ;; ----------------------------------------------------------------------
   ;; Structures and helpers
 
-  (define undefined (letrec ([x x]) x)) ; initial value
-
   (define insp (current-inspector)) ; for named structures
 
   (define-struct unit (num-imports exports go)) ; unit value
diff --git a/pkgs/htdp-pkgs/htdp-lib/lang/private/teach.rkt b/pkgs/htdp-pkgs/htdp-lib/lang/private/teach.rkt
index 87bc2841f4..fd95907105 100644
--- a/pkgs/htdp-pkgs/htdp-lib/lang/private/teach.rkt
+++ b/pkgs/htdp-pkgs/htdp-lib/lang/private/teach.rkt
@@ -38,6 +38,7 @@
            mzlib/math
            mzlib/pconvert-prop
            scheme/match
+           racket/undefined
            "set-result.rkt"
            (only racket/base define-struct)
 	   racket/struct-info
@@ -87,15 +88,14 @@
         (current-continuation-marks)))))
 
   ;; Wrapped around uses of local-bound variables:
-  (define (check-not-undefined name val)
-    (if (eq? val undefined)
+  (define (teach-check-not-undefined name val)
+    (if (undefined? val)
       (raise
        (make-exn:fail:contract:variable
         (format "local variable used before its definition: ~a" name)
         (current-continuation-marks)
         name))
       val))
-  (define undefined (letrec ([x x]) x))
 
   (define (identifier-is-bound? id)
     (or (identifier-binding id)
@@ -1147,11 +1147,11 @@
     ;; For intermediate:
 
     ;; This application form disallows rator expressions that aren't
-    ;; top-level identifiers or of the form `(check-not-undefined ...)'.
+    ;; top-level identifiers or of the form `(teach-check-not-undefined ...)'.
 
     ;; The latter is probably surprising. It turns out that every use of
     ;; a `local'-bound identifier gets converted to an undefined check,
-    ;; and the call to `check-not-undefined' can't be forged by the
+    ;; and the call to `teach-check-not-undefined' can't be forged by the
     ;; programmer. So the pattern-match effectively recognizes uses of
     ;; `local'-bound identifiers, which are legal as rator
     ;; expressions. (`let' and `letrec' get converted to `local'.)
@@ -1163,8 +1163,8 @@
 		 (syntax-case stx ()
 		   [(_ rator rand ...)
 		    (let* ([fun (syntax rator)]
-			   [undef-check? (syntax-case fun (check-not-undefined)
-					   [(check-not-undefined id)
+			   [undef-check? (syntax-case fun (teach-check-not-undefined)
+					   [(teach-check-not-undefined id)
 					    #t]
 					   [_else #f])]
 			   [binding (and (identifier? fun)
@@ -1749,7 +1749,7 @@
 					      ((define-syntaxes (def-id/prop ...)
 						 (values
 						  (make-undefined-check
-						   (quote-syntax check-not-undefined)
+						   (quote-syntax teach-check-not-undefined)
 						   (quote-syntax tmp-id))
 						  ...))
 					       ...)))])
@@ -1818,7 +1818,7 @@
 	      (quasisyntax/loc stx
                 (#%stratified-body
                   (define-syntaxes (name) (make-undefined-check
-                                           (quote-syntax check-not-undefined)
+                                           (quote-syntax teach-check-not-undefined)
                                            (quote-syntax tmp-id)))
                   ...
                   (define-values (tmp-id) rhs-expr)
@@ -1853,7 +1853,7 @@
                 (let-values ([(tmp-id) rhs-expr] ...)
                   #,(stepper-syntax-property
                      #`(let-syntaxes ([(name) (make-undefined-check
-                                               (quote-syntax check-not-undefined)
+                                               (quote-syntax teach-check-not-undefined)
                                                (quote-syntax tmp-id))]
                                       ...)
                                      expr)
diff --git a/pkgs/pconvert-lib/mzlib/pconvert.rkt b/pkgs/pconvert-lib/mzlib/pconvert.rkt
index 51f6788c12..a2f932e2a3 100644
--- a/pkgs/pconvert-lib/mzlib/pconvert.rkt
+++ b/pkgs/pconvert-lib/mzlib/pconvert.rkt
@@ -4,7 +4,8 @@
   (require (only racket/base sort)
            compatibility/mlist
 	   "pconvert-prop.rkt"
-           racket/class)
+           racket/class
+           racket/undefined)
   
   (provide show-sharing
            constructor-style-printing
@@ -27,8 +28,6 @@
            current-build-share-hook
            current-print-convert-hook)
   
-  (define undefined-val (letrec ([x x]) x))
-  
   ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
   ;; the value stored in the hash table.  Contains the name
   ;; <which is a number unless we are in donkey and it already has a name>
@@ -123,7 +122,9 @@
                         (boolean? expr)
                         (char? expr) (void? expr)
                         (null? expr)
-                        (eq? expr undefined-val) ; #<undefined> test - yuck
+                        ;; #<undefined> test - yuck, and maybe not worth checking
+                        ;; anymore, since undefined generally shouldn't escape
+                        (undefined? expr) 
                         )
                     'atomic]
                    [(and (not (struct? expr))  ;; struct names are the wrong thing, here
diff --git a/pkgs/plai/datatype.rkt b/pkgs/plai/datatype.rkt
index c5a3ca5326..84090fc450 100644
--- a/pkgs/plai/datatype.rkt
+++ b/pkgs/plai/datatype.rkt
@@ -2,7 +2,8 @@
 (require (for-syntax racket/base
                      racket/list)
          racket/list
-         racket/contract)
+         racket/contract
+         racket/undefined)
 
 (provide define-type type-case)
 
@@ -86,11 +87,6 @@
                 stx)]
               [_ (transfer-srcloc orig stx)]))))
 
-(define the-undefined
-  (letrec ([x x]) x))
-(define (undefined? x)
-  (eq? the-undefined x))
-
 (define-syntax (define-type stx)
   (syntax-parse
       stx
diff --git a/pkgs/r5rs-pkgs/r5rs-lib/r5rs/main.rkt b/pkgs/r5rs-pkgs/r5rs-lib/r5rs/main.rkt
index 1a96490349..4061636345 100644
--- a/pkgs/r5rs-pkgs/r5rs-lib/r5rs/main.rkt
+++ b/pkgs/r5rs-pkgs/r5rs-lib/r5rs/main.rkt
@@ -1,5 +1,6 @@
 (module main scheme/base
   (require scheme/mpair
+           racket/undefined
            (for-syntax scheme/base syntax/kerncase
                        "private/r5rs-trans.rkt")
            (only-in mzscheme transcript-on transcript-off))
@@ -243,7 +244,6 @@
 
   ;; Copied from R5rS, but with an added `let' around body,
   ;; and with optimization for precedure letrecs
-  (define undefined (letrec ([u u]) u))
   (define-for-syntax (immediate-value? stx)
     (let ([v (syntax-e stx)])
       (or (number? v)
diff --git a/pkgs/racket-pkgs/racket-doc/scribblings/reference/data.scrbl b/pkgs/racket-pkgs/racket-doc/scribblings/reference/data.scrbl
index e0cf7bf794..697f4a6c7b 100644
--- a/pkgs/racket-pkgs/racket-doc/scribblings/reference/data.scrbl
+++ b/pkgs/racket-pkgs/racket-doc/scribblings/reference/data.scrbl
@@ -174,15 +174,27 @@ The @|void-const| value is always @racket[eq?] to itself.
 @; ----------------------------------------------------------------------
 @section[#:tag "undefined"]{Undefined}
 
-The constant @|undefined-const| is used as the initial value for
-@racket[letrec] bindings and in other places where a placeholder value
-is needed before a specific value can be assigned. Use
-@racket[undefined] (which is bound to @|undefined-const|) as a last resort.
+@note-lib[racket/undefined]
 
-The @|undefined-const| value is always @racket[eq?] to itself.
+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.
 
-@note-lib-only[racket/undefined]
+The @racket[undefined] value is always @racket[eq?] to itself.
 
-@defthing[undefined any/c]{The @|undefined-const| constant.}
+@defproc[(undefined? [v any/c]) boolean?]{Returns @racket[#t] if @racket[v] is the
+ constant @racket[undefined], @racket[#f] otherwise.}
 
-@history[#:added "6.0.0.6"]
+
+@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 it is returned.
+
+}
diff --git a/pkgs/racket-pkgs/racket-test/tests/racket/optimize.rktl b/pkgs/racket-pkgs/racket-test/tests/racket/optimize.rktl
index 4ad749b545..732faa85e6 100644
--- a/pkgs/racket-pkgs/racket-test/tests/racket/optimize.rktl
+++ b/pkgs/racket-pkgs/racket-test/tests/racket/optimize.rktl
@@ -918,6 +918,9 @@
 (test-comp '(let ([x 8][y 9]) (lambda () (+ x y)))
 	   '(let ([x 8][y 9]) (lambda () (if #f y (+ x y)))))
 
+;; Don't optimize away use before definition:
+(test-comp '(letrec ([x (begin x 5)]) x) '5 #f)
+
 (test-comp '(let ([x 5]) (set! x 2)) '(let ([x 5]) (set! x x) (set! x 2)))
 
 (test-comp '(let* () (f 5))
diff --git a/pkgs/racket-pkgs/racket-test/tests/racket/syntax.rktl b/pkgs/racket-pkgs/racket-test/tests/racket/syntax.rktl
index db19b24479..8b7b1d6558 100644
--- a/pkgs/racket-pkgs/racket-test/tests/racket/syntax.rktl
+++ b/pkgs/racket-pkgs/racket-test/tests/racket/syntax.rktl
@@ -87,8 +87,8 @@
   (let ((x 4))
     (lambda (y) (+ x y))))
 (test 10 add4 6)
-(test (letrec([x x]) x) 'lambda (let ([x (lambda () (define d d) d)]) (x)))
-(test (letrec([x x]) x) 'lambda ((lambda () (define d d) d)))
+(err/rt-test (let ([x (lambda () (define d d) d)]) (x)) exn:fail:contract:variable?)
+(err/rt-test ((lambda () (define d d) d)) exn:fail:contract:variable?)
 (test '(3 4 5 6) (lambda x x) 3 4 5 6)
 (test '(5 6) (lambda (x y . z) z) 3 4 5 6)
 (test 'second (lambda () (cons 'first 2) 'second))
@@ -643,8 +643,8 @@
 (test 'twox 'let*-values (let*-values ([() (values)][() (values)]) 'twox))
 (test 'threex 'letrec-values (letrec-values ([() (values)][() (values)]) 'threex))
 
-(letrec ([undef undef])
-  (test (list 1 undef undef) 'no-split-letrec (letrec-values ([(a b c) (values 1 a b)]) (list a b c))))
+(err/rt-test (letrec-values ([(a b c) (values 1 a b)]) (list a b c))
+              exn:fail:contract:variable?)
 
 (test '(10 11) 'letrec-values (letrec-values ([(names kps)
 					       (letrec ([oloop 10])
@@ -1642,13 +1642,15 @@
 ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; check that the compiler is not too agressive with `letrec' -> `let*'
 
-(test "#<undefined>\nready\n"
+(test "<undefined>\nready\n"
       get-output-string
       (let ([p (open-output-string)])
         (parameterize ([current-output-port p])
           (let ([restart void])
             (letrec ([dummy1 (let/cc k (set! restart k))]
-                     [dummy2 (displayln maybe-ready)]
+                     [dummy2 (displayln (with-handlers ([exn:fail:contract:variable?
+                                                         (lambda (exn) '<undefined>)])
+                                          maybe-ready))]
                      [maybe-ready 'ready])
               (let ([rs restart])
                 (set! restart void)
diff --git a/pkgs/swindle/tiny-clos.rkt b/pkgs/swindle/tiny-clos.rkt
index 3a799860e5..a1647de142 100644
--- a/pkgs/swindle/tiny-clos.rkt
+++ b/pkgs/swindle/tiny-clos.rkt
@@ -116,7 +116,8 @@
 ;;; OK, now let's get going.  But, as usual, before we can do anything
 ;;; interesting, we have to muck around for a bit first.  First, we need to
 ;;; load the support library.  [-- replaced with a module.]
-(require swindle/misc)
+(require swindle/misc
+         racket/undefined)
 
 ;; This is a convenient function for raising exceptions
 (define (raise* exn-maker fmt . args)
@@ -219,7 +220,7 @@
 ;;>   This is Racket's `unspecified' value which is used as the default
 ;;>   value for unbound slots.  It is provided so you can check if a slot is
 ;;>   unbound.
-(define* ??? (letrec ([x x]) x)) ; this is Racket's #<undefined> value
+(define* ??? undefined)
 (define unspecified-initializer (lambda args ???))
 (define false-func (lambda args #f))
 
diff --git a/pkgs/typed-racket-pkgs/typed-racket-lib/typed-racket/types/abbrev.rkt b/pkgs/typed-racket-pkgs/typed-racket-lib/typed-racket/types/abbrev.rkt
index 4cb1940a2f..258d0983ea 100644
--- a/pkgs/typed-racket-pkgs/typed-racket-lib/typed-racket/types/abbrev.rkt
+++ b/pkgs/typed-racket-pkgs/typed-racket-lib/typed-racket/types/abbrev.rkt
@@ -8,6 +8,7 @@
          racket/list
          racket/match
          racket/function
+         racket/undefined
          unstable/function
 
          (prefix-in c: (contract-req))
@@ -91,8 +92,8 @@
 (define/decl -Boolean (Un -False -True))
 (define/decl -Undefined
   (make-Base 'Undefined
-             #'(lambda (x) (equal? (letrec ([y y]) y) x)) ; initial value of letrec bindings
-             (lambda (x) (equal? (letrec ([y y]) y) x))))
+             #'undefined? ; initial value of letrec bindings
+             undefined?))
 (define/decl -Bytes (make-Base 'Bytes #'bytes? bytes?))
 (define/decl -Base-Regexp (make-Base 'Base-Regexp
                            #'(and/c regexp? (not/c pregexp?))
diff --git a/pkgs/typed-racket-pkgs/typed-racket-lib/typed-racket/utils/any-wrap.rkt b/pkgs/typed-racket-pkgs/typed-racket-lib/typed-racket/utils/any-wrap.rkt
index 9d68fc3d4b..18d9c29dcf 100644
--- a/pkgs/typed-racket-pkgs/typed-racket-lib/typed-racket/utils/any-wrap.rkt
+++ b/pkgs/typed-racket-pkgs/typed-racket-lib/typed-racket/utils/any-wrap.rkt
@@ -3,15 +3,14 @@
 (require racket/match racket/contract/combinator
          racket/fixnum racket/flonum
          racket/set
+         racket/undefined
          (only-in (combine-in racket/private/promise)
                   promise?
                   prop:force promise-forcer))
 
-(define undef (letrec ([x x]) x))
-
 (define (base-val? e)
   (or (number? e) (string? e) (char? e) (symbol? e)
-      (null? e) (regexp? e) (eq? undef e) (path? e)
+      (null? e) (regexp? e) (undefined? e) (path? e)
       (regexp? e) (keyword? e) (bytes? e) (boolean? e) (void? e)
       ;; Base values because you can only store flonums/fixnums in these
       ;; and not any higher-order values. This isn't sound if we ever
diff --git a/racket/collects/racket/contract/private/misc.rkt b/racket/collects/racket/contract/private/misc.rkt
index d5be237544..668b5c128e 100644
--- a/racket/collects/racket/contract/private/misc.rkt
+++ b/racket/collects/racket/contract/private/misc.rkt
@@ -557,26 +557,23 @@
   (apply or/c ss))
 
 (define atomic-value? 
-  (let ([undefined (letrec ([x x]) x)])
-    (λ (x)
-      (or (char? x) (symbol? x) (boolean? x)
-          (null? x) (keyword? x) (number? x)
-          (void? x) (eq? x undefined)))))
+  (λ (x)
+     (or (char? x) (symbol? x) (boolean? x)
+         (null? x) (keyword? x) (number? x)
+         (void? x))))
 
 (define/final-prop (one-of/c . elems)
   (for ([arg (in-list elems)]
         [i (in-naturals)])
     (unless (atomic-value? arg)
       (raise-argument-error 'one-of/c
-                            "char, symbol, boolean, null, keyword, number, void, or undefined"
+                            "char, symbol, boolean, null, keyword, number, or void"
                             i
                             elems)))
-  (define (undefined? x) (eq? x (letrec ([x x]) x)))
   (define or/c-args
     (map (λ (x)
            (cond
              [(void? x) void?]
-             [(undefined? x) undefined?]
              [else x]))
          elems))
   (apply or/c or/c-args))
diff --git a/racket/collects/racket/private/class-c-old.rkt b/racket/collects/racket/private/class-c-old.rkt
index 517d883c92..2e05c84b44 100644
--- a/racket/collects/racket/private/class-c-old.rkt
+++ b/racket/collects/racket/private/class-c-old.rkt
@@ -3,6 +3,7 @@
                      racket/stxparam
                      syntax/parse)
          racket/stxparam
+         racket/undefined
          "class-wrapped.rkt"
          "class-internal.rkt"
          "../contract/base.rkt"
@@ -20,8 +21,6 @@
          build-internal-class/c internal-class/c-proj
          class/c-internal-name-clauses)
 
-(define undefined (letrec ([x x]) x))
-
 ;; Shorthand contracts that treat the implicit object argument as if it were
 ;; contracted with any/c.
 (define-syntax-rule (->m . stx)
diff --git a/racket/collects/racket/private/class-internal.rkt b/racket/collects/racket/private/class-internal.rkt
index d9b831ce19..1191c811eb 100644
--- a/racket/collects/racket/private/class-internal.rkt
+++ b/racket/collects/racket/private/class-internal.rkt
@@ -9,6 +9,7 @@
          (only-in "../contract/region.rkt" current-contract-region)
          "../contract/base.rkt"
          "../contract/combinator.rkt"
+         racket/undefined
          (for-syntax racket/stxparam
                      syntax/kerncase
                      syntax/stx
@@ -4375,8 +4376,6 @@ An example
 ;;  misc utils
 ;;--------------------------------------------------------------------
 
-(define undefined (letrec ([x x]) x))
-
 (define-struct (exn:fail:object exn:fail) () #:inspector insp)
 
 (struct as-write (content))
diff --git a/racket/collects/racket/private/classidmap.rkt b/racket/collects/racket/private/classidmap.rkt
index 0f6a8a7e10..b0dd01c342 100644
--- a/racket/collects/racket/private/classidmap.rkt
+++ b/racket/collects/racket/private/classidmap.rkt
@@ -3,6 +3,7 @@
 (require syntax/stx
          (for-syntax racket/base)
          (for-template racket/base
+                       racket/undefined
                        "class-wrapped.rkt"))
 
 (define insp (variable-reference->module-declaration-inspector
@@ -83,12 +84,12 @@
             [(id . args)
              (with-syntax ([bindings (syntax/loc stx ([obj obj-expr]))]
                            [call (quasisyntax/loc stx
-                                   (((unsyntax field-accessor) obj) . args))])
+                                   ((check-not-undefined ((unsyntax field-accessor) obj) 'id) . args))])
                (syntax/loc stx (let* bindings call)))]
             [id
              (with-syntax ([bindings (syntax/loc stx ([obj obj-expr]))]
                            [get (quasisyntax/loc stx
-                                  ((unsyntax field-accessor) obj))])
+                                  (check-not-undefined ((unsyntax field-accessor) obj) 'id))])
                (syntax/loc stx (let* bindings get)))])))))))
 
 (define (make-method-map the-finder the-obj the-binder the-binder-localized method-accessor)
diff --git a/racket/collects/racket/private/pre-base.rkt b/racket/collects/racket/private/pre-base.rkt
index 8266105f22..b3bbb836e4 100644
--- a/racket/collects/racket/private/pre-base.rkt
+++ b/racket/collects/racket/private/pre-base.rkt
@@ -179,7 +179,8 @@
                               procedure->method procedure-rename
                               chaperone-procedure impersonate-procedure
                               assq assv assoc
-                              prop:incomplete-arity prop:method-arity-error)
+                              prop:incomplete-arity prop:method-arity-error
+                              check-not-undefined undefined)
              (all-from "reqprov.rkt")
              (all-from-except "for.rkt"
                               define-in-vector-like
diff --git a/racket/collects/racket/private/unit-runtime.rkt b/racket/collects/racket/private/unit-runtime.rkt
index ddc971c7f9..c8c56936fa 100644
--- a/racket/collects/racket/private/unit-runtime.rkt
+++ b/racket/collects/racket/private/unit-runtime.rkt
@@ -2,7 +2,7 @@
 
 (require (for-syntax "unit-syntax.rkt" racket/base))
 (provide define-syntax/err-param
-         undefined (rename-out [make-a-unit make-unit]) unit-import-sigs unit-export-sigs unit-go unit? unit-deps
+         (rename-out [make-a-unit make-unit]) unit-import-sigs unit-export-sigs unit-go unit? unit-deps
          check-unit check-no-imports check-sigs check-deps check-helper)
   
 (define-syntax define-syntax/err-param
@@ -12,9 +12,6 @@
        (parameterize ((error-syntax arg))
          body)))))
 
-;; initial value
-(define undefined (letrec ([x x]) x))
-
 ;; for named structures
 (define insp (current-inspector))
 
diff --git a/racket/collects/racket/shared.rkt b/racket/collects/racket/shared.rkt
index ca37e8160e..1a95d4a80d 100644
--- a/racket/collects/racket/shared.rkt
+++ b/racket/collects/racket/shared.rkt
@@ -3,14 +3,14 @@
                      syntax/kerncase
                      syntax/struct
                      racket/struct-info
-                     racket/include))
+                     racket/include)
+         racket/undefined)
 
 (provide shared)
 
 (define-for-syntax code-insp (variable-reference->module-declaration-inspector
                               (#%variable-reference)))
 
-(define undefined (letrec ([x x]) x))
 (require (only-in racket/base [cons the-cons]))
 
 (define-syntax shared
diff --git a/racket/collects/racket/undefined.rkt b/racket/collects/racket/undefined.rkt
index 29252b11b5..bd9b7d367f 100644
--- a/racket/collects/racket/undefined.rkt
+++ b/racket/collects/racket/undefined.rkt
@@ -1,8 +1,8 @@
 #lang racket/base
+(require '#%kernel)
 
-(provide undefined)
+(provide check-not-undefined
+         undefined
+         undefined?)
 
-;; In a future version of Racket, this `letrec` pattern
-;; will not work, but the `racket/undefined` library will
-;; still export an `undefined`:
-(define undefined (letrec ([x x]) x))
+(define (undefined? v) (eq? v undefined))
diff --git a/racket/collects/racket/unit.rkt b/racket/collects/racket/unit.rkt
index e7c98b9a88..d637f9b4f9 100644
--- a/racket/collects/racket/unit.rkt
+++ b/racket/collects/racket/unit.rkt
@@ -17,6 +17,7 @@
                      "private/unit-syntax.rkt"))
 
 (require racket/block
+         racket/undefined
          racket/contract/base
          racket/contract/region
          racket/stxparam
@@ -1186,7 +1187,8 @@
         (lambda (int/ext-name index ctc)
           (bound-identifier-mapping-put! def-table
                                          (car int/ext-name)
-                                         #`(vector-ref #,v #,index))
+                                         #`(check-not-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/syntax/toplevel.rkt b/racket/collects/syntax/toplevel.rkt
index b35ba4fbde..b775937f74 100644
--- a/racket/collects/syntax/toplevel.rkt
+++ b/racket/collects/syntax/toplevel.rkt
@@ -1,5 +1,6 @@
 (module toplevel racket/base
-  (require "kerncase.rkt")
+  (require "kerncase.rkt"
+           racket/undefined)
   
   (provide eval-compile-time-part-of-top-level
            eval-compile-time-part-of-top-level/compile
@@ -74,8 +75,7 @@
 	 (begin0
 	  (when compile? (compile-syntax stx))
 	  (for-each (lambda (id)
-		      (with-syntax ([id id]
-				    [undefined (letrec ([x x]) x)])
+		      (with-syntax ([id id])
 			(eval-syntax (syntax (define-values (id) undefined)))))
 		    (syntax->list (syntax (id ...)))))]
         [_else 
diff --git a/racket/src/racket/gc2/Makefile.in b/racket/src/racket/gc2/Makefile.in
index 6630aeb4b9..0f0794e094 100644
--- a/racket/src/racket/gc2/Makefile.in
+++ b/racket/src/racket/gc2/Makefile.in
@@ -76,6 +76,7 @@ OBJS =  salloc.@LTO@ \
 	jitprep.@LTO@ \
 	jitstack.@LTO@ \
 	jitstate.@LTO@ \
+	letrec_check.@LTO@ \
 	list.@LTO@ \
 	marshal.@LTO@ \
 	module.@LTO@ \
@@ -135,6 +136,7 @@ XSRCS = $(XSRCDIR)/salloc.c \
 	$(XSRCDIR)/jitprep.c \
 	$(XSRCDIR)/jitstack.c \
 	$(XSRCDIR)/jitstate.c \
+	$(XSRCDIR)/letrec_check.c \
 	$(XSRCDIR)/list.c \
 	$(XSRCDIR)/marshal.c \
 	$(XSRCDIR)/module.c \
@@ -253,6 +255,8 @@ $(XSRCDIR)/marshal.c: ../src/marshal.@LTO@ $(XFORMDEP) $(SRCDIR)/mzrt.h
 	$(XFORM) $(XSRCDIR)/marshal.c $(SRCDIR)/marshal.c
 $(XSRCDIR)/module.c: ../src/module.@LTO@ $(XFORMDEP) $(SRCDIR)/mzrt.h
 	$(XFORM) $(XSRCDIR)/module.c $(SRCDIR)/module.c
+$(XSRCDIR)/letrec_check.c: ../src/letrec_check.@LTO@ $(XFORMDEP)
+	$(XFORM) $(XSRCDIR)/letrec_check.c $(SRCDIR)/letrec_check.c
 $(XSRCDIR)/list.c: ../src/list.@LTO@ $(XFORMDEP)
 	$(XFORM) $(XSRCDIR)/list.c $(SRCDIR)/list.c
 $(XSRCDIR)/network.c: ../src/network.@LTO@ $(XFORMDEP)
@@ -360,6 +364,8 @@ jitstack.@LTO@: $(XSRCDIR)/jitstack.c
 	$(CC) $(ALL_CFLAGS) -c $(XSRCDIR)/jitstack.c -o jitstack.@LTO@
 jitstate.@LTO@: $(XSRCDIR)/jitstate.c
 	$(CC) $(ALL_CFLAGS) -c $(XSRCDIR)/jitstate.c -o jitstate.@LTO@
+letrec_check.@LTO@: $(XSRCDIR)/letrec_check.c
+	$(CC) $(ALL_CFLAGS) -c $(XSRCDIR)/letrec_check.c -o letrec_check.@LTO@
 list.@LTO@: $(XSRCDIR)/list.c
 	$(CC) $(ALL_CFLAGS) -c $(XSRCDIR)/list.c -o list.@LTO@
 marshal.@LTO@: $(XSRCDIR)/marshal.c
diff --git a/racket/src/racket/src/Makefile.in b/racket/src/racket/src/Makefile.in
index e64c8f286e..3583b8c718 100644
--- a/racket/src/racket/src/Makefile.in
+++ b/racket/src/racket/src/Makefile.in
@@ -39,6 +39,7 @@ OBJS =  salloc.@LTO@ \
 	jitprep.@LTO@ \
 	jitstack.@LTO@ \
 	jitstate.@LTO@ \
+	letrec_check.@LTO@ \
 	list.@LTO@ \
 	marshal.@LTO@ \
 	module.@LTO@ \
@@ -96,6 +97,7 @@ SRCS =  $(srcdir)/salloc.c \
 	$(srcdir)/jitprep.c \
 	$(srcdir)/jitstack.c \
 	$(srcdir)/jitstate.c \
+	$(srcdir)/letrec_check.c \
 	$(srcdir)/list.c \
 	$(srcdir)/marshal.c \
 	$(srcdir)/module.c \
@@ -226,6 +228,8 @@ jitstack.@LTO@: $(srcdir)/jitstack.c
 	$(CC) $(ALL_CFLAGS) -c $(srcdir)/jitstack.c -o jitstack.@LTO@
 jitstate.@LTO@: $(srcdir)/jitstate.c
 	$(CC) $(ALL_CFLAGS) -c $(srcdir)/jitstate.c -o jitstate.@LTO@
+letrec_check.@LTO@: $(srcdir)/letrec_check.c
+	$(CC) $(ALL_CFLAGS) -c $(srcdir)/letrec_check.c -o letrec_check.@LTO@
 list.@LTO@: $(srcdir)/list.c
 	$(CC) $(ALL_CFLAGS) -c $(srcdir)/list.c -o list.@LTO@
 marshal.@LTO@: $(srcdir)/marshal.c
@@ -362,6 +366,8 @@ jitprep.@LTO@: $(COMMON_HEADERS) \
 jitstack.@LTO@: $(COMMON_HEADERS) $(JIT_HEADERS) $(srcdir)/codetab.inc \
         $(srcdir)/unwind/libunwind.h
 jitstate.@LTO@: $(COMMON_HEADERS) $(JIT_HEADERS)
+letrec_check.@LTO@: $(COMMON_HEADERS) \
+        $(srcdir)/stypes.h  
 list.@LTO@: $(COMMON_HEADERS) \
         $(srcdir)/stypes.h  
 marshal.@LTO@: $(COMMON_HEADERS) \
diff --git a/racket/src/racket/src/compenv.c b/racket/src/racket/src/compenv.c
index 5a7d838d5c..45001b83b4 100644
--- a/racket/src/racket/src/compenv.c
+++ b/racket/src/racket/src/compenv.c
@@ -28,6 +28,10 @@
 
 #define TABLE_CACHE_MAX_SIZE 2048
 
+/* Pre-allocate local variable reference objects.
+   first dimension: position in the current stack frame
+   second dimension: 0 for local variables, 1 for unboxed local variables
+   third dimension: flags. TODO has to do with whether something is an unboxed fixnum, flonum, or extnum */
 READ_ONLY static Scheme_Object *scheme_local[MAX_CONST_LOCAL_POS][MAX_CONST_LOCAL_TYPES][MAX_CONST_LOCAL_FLAG_VAL + 1];
 READ_ONLY static Scheme_Object *toplevels[MAX_CONST_TOPLEVEL_DEPTH][MAX_CONST_TOPLEVEL_POS][SCHEME_TOPLEVEL_FLAGS_MASK + 1];
 
@@ -853,11 +857,14 @@ static Scheme_Object *alloc_local(short type, int pos)
   return (Scheme_Object *)v;
 }
 
+/* type should be either scheme_local_type or scheme_local_unbox_type
+   TODO: double check that */
 Scheme_Object *scheme_make_local(Scheme_Type type, int pos, int flags)
 {
   int k;
   Scheme_Object *v, *key;
 
+  /* k is 0 if type is scheme_local_type and 1 if type is scheme_local_unbox_type */
   k = type - scheme_local_type;
   
   /* Helper for reading bytecode: make sure flags is a valid value */
@@ -899,7 +906,9 @@ static Scheme_Local *get_frame_loc(Scheme_Comp_Env *frame,
   int cnt, u;
 
   u = COMPILE_DATA(frame)->use[i];
-  
+
+  // flags -= (flags & SCHEME_APP_POS);
+
   u |= (((flags & (SCHEME_APP_POS | SCHEME_SETTING))
 	 ? CONSTRAINED_USE
 	 : ((u & (ARBITRARY_USE | ONE_ARBITRARY_USE)) ? ARBITRARY_USE : ONE_ARBITRARY_USE))
diff --git a/racket/src/racket/src/compile.c b/racket/src/racket/src/compile.c
index f70213a8c1..f7adca4fbd 100644
--- a/racket/src/racket/src/compile.c
+++ b/racket/src/racket/src/compile.c
@@ -1210,18 +1210,6 @@ set_syntax (Scheme_Object *form, Scheme_Comp_Env *env, Scheme_Compile_Info *rec,
   rec[drec].value_name = SCHEME_STX_SYM(name);
 
   val = scheme_compile_expr(body, scheme_no_defines(env), rec, drec);
-
-  /* check for (set! x x) */
-  if (SAME_TYPE(SCHEME_TYPE(var), SCHEME_TYPE(val))) {
-    if (SAME_TYPE(SCHEME_TYPE(var), scheme_local_type)
-	|| SAME_TYPE(SCHEME_TYPE(var), scheme_local_unbox_type)) {
-      /* local */
-      if (SCHEME_LOCAL_POS(var) == SCHEME_LOCAL_POS(val))
-	return scheme_compiled_void();
-    } else {
-      /* global; can't do anything b/c var might be undefined or constant */
-    }
-  }
   
   set_undef = (rec[drec].comp_flags & COMP_ALLOW_SET_UNDEFINED);
  
@@ -2073,7 +2061,7 @@ gen_let_syntax (Scheme_Object *form, Scheme_Comp_Env *origenv, char *formname,
 		int star, int recursive, int multi, Scheme_Compile_Info *rec, int drec,
 		Scheme_Comp_Env *frame_already)
 {
-  Scheme_Object *bindings, *l, *binding, *name, **names, *forms, *defname;
+  Scheme_Object *bindings, *l, *binding, *name, **names, **clv_names, *forms, *defname;
   int num_clauses, num_bindings, i, j, k, m, pre_k;
   Scheme_Comp_Env *frame, *env, *rhs_env;
   Scheme_Compile_Info *recs;
@@ -2110,6 +2098,7 @@ gen_let_syntax (Scheme_Object *form, Scheme_Comp_Env *origenv, char *formname,
   post_bind = !recursive && !star;
   rev_bind_order = recursive;
 
+  /* forms ends up being the let body */
   forms = SCHEME_STX_CDR(form);
   forms = SCHEME_STX_CDR(forms);
   forms = scheme_datum_to_syntax(forms, form, form, 0, 0);
@@ -2266,6 +2255,16 @@ gen_let_syntax (Scheme_Object *form, Scheme_Comp_Env *origenv, char *formname,
     lv->count = (k - pre_k);
     lv->position = pre_k;
 
+    if (recursive) {
+      /* The names are only used for recursive bindings (in letrec_check),
+         currently. It would be ok if we record extra names, though. */
+      clv_names = MALLOC_N(Scheme_Object*, lv->count);
+      for (m = pre_k; m < k; m++) {
+        clv_names[m - pre_k] = SCHEME_STX_SYM(names[m]);
+      }
+      lv->names = clv_names;
+    }
+
     if (lv->count == 1)
       recs[i].value_name = SCHEME_STX_SYM(names[pre_k]);
 
@@ -2827,6 +2826,8 @@ do_begin_syntax(char *name,
   if (zero)
     env = scheme_no_defines(env);
 
+  /* if the begin has only one expression inside, drop the begin 
+     TODO: is this right */
   if (SCHEME_STX_NULLP(SCHEME_STX_CDR(forms))) {
     forms = SCHEME_STX_CAR(forms);
     return scheme_compile_expr(forms, env, rec, drec);
@@ -2924,9 +2925,9 @@ Scheme_Object *scheme_make_sequence_compilation(Scheme_Object *seq, int opt)
       /* "Inline" nested begins */
       count += ((Scheme_Sequence *)v)->count;
       total++;
-    } else if (opt 
-	       && (((opt > 0) && !last) || ((opt < 0) && !first))
-	       && scheme_omittable_expr(v, -1, -1, 0, NULL, NULL, -1, 0)) {
+    } else if (opt
+               && (((opt > 0) && !last) || ((opt < 0) && !first))
+               && scheme_omittable_expr(v, -1, -1, 0, NULL, NULL, -1, 1)) {
       /* A value that is not the result. We'll drop it. */
       total++;
     } else {
@@ -2954,7 +2955,7 @@ Scheme_Object *scheme_make_sequence_compilation(Scheme_Object *seq, int opt)
       /* can't optimize away a begin0 at read time; it's too late, since the
          return is combined with EXPD_BEGIN0 */
       addconst = 1;
-    } else if ((opt < 0) && !scheme_omittable_expr(SCHEME_CAR(seq), 1, -1, 0, NULL, NULL, -1, 0)) {
+    } else if ((opt < 0) && !scheme_omittable_expr(SCHEME_CAR(seq), 1, -1, 0, NULL, NULL, -1, 1)) {
       /* We can't optimize (begin0 expr cont) to expr because
 	 exp is not in tail position in the original (so we'd mess
 	 up continuation marks). */
@@ -2986,7 +2987,7 @@ Scheme_Object *scheme_make_sequence_compilation(Scheme_Object *seq, int opt)
     } else if (opt 
 	       && (((opt > 0) && (k < total))
 		   || ((opt < 0) && k))
-	       && scheme_omittable_expr(v, -1, -1, 0, NULL, NULL, -1, 0)) {
+	       && scheme_omittable_expr(v, -1, -1, 0, NULL, NULL, -1, 1)) {
       /* Value not the result. Do nothing. */
     } else
       o->array[i++] = v;
@@ -3574,6 +3575,8 @@ void scheme_bind_syntaxes(const char *where, Scheme_Object *names, Scheme_Object
 
   a = scheme_compile_expr_lift_to_let(a, eenv, &mrec, 0);
 
+  a = scheme_letrec_check_expr(a);
+
   oi = scheme_optimize_info_create(eenv->prefix, 1);
   if (!(rec[drec].comp_flags & COMP_CAN_INLINE))
     scheme_optimize_info_never_inline(oi);
diff --git a/racket/src/racket/src/cstartup.inc b/racket/src/racket/src/cstartup.inc
index bb5e9cdbd3..960baf2a3a 100644
--- a/racket/src/racket/src/cstartup.inc
+++ b/racket/src/racket/src/cstartup.inc
@@ -1,14 +1,14 @@
   {
-    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,54,46,48,46,48,46,52,84,0,0,0,0,0,0,0,0,0,0,
+    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,54,46,48,46,49,46,50,84,0,0,0,0,0,0,0,0,0,0,
 0,0,0,0,0,0,0,0,0,0,51,0,0,0,1,0,0,10,0,14,0,
-19,0,32,0,37,0,40,0,47,0,54,0,59,0,63,0,67,0,74,0,83,
+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,
 163,0,170,0,192,0,194,0,208,0,19,1,48,1,59,1,70,1,96,1,129,
 1,162,1,224,1,24,2,105,2,161,2,166,2,187,2,84,3,105,3,158,3,
 225,3,114,4,2,5,56,5,67,5,150,5,0,0,115,7,0,0,69,35,37,
-109,105,110,45,115,116,120,29,11,11,11,64,119,104,101,110,72,112,97,114,97,
-109,101,116,101,114,105,122,101,64,99,111,110,100,62,111,114,66,100,101,102,105,
-110,101,66,108,101,116,114,101,99,64,108,101,116,42,63,108,101,116,63,97,110,
+109,105,110,45,115,116,120,29,11,11,11,66,100,101,102,105,110,101,66,108,101,
+116,114,101,99,64,108,101,116,42,63,97,110,100,62,111,114,64,119,104,101,110,
+72,112,97,114,97,109,101,116,101,114,105,122,101,63,108,101,116,64,99,111,110,
 100,66,117,110,108,101,115,115,68,104,101,114,101,45,115,116,120,29,11,11,11,
 65,113,117,111,116,101,29,94,2,15,68,35,37,107,101,114,110,101,108,11,29,
 94,2,15,68,35,37,112,97,114,97,109,122,11,62,105,102,65,98,101,103,105,
@@ -17,63 +17,63 @@
 20,112,97,114,97,109,101,116,101,114,105,122,97,116,105,111,110,45,107,101,121,
 61,118,73,100,101,102,105,110,101,45,118,97,108,117,101,115,97,36,11,8,240,
 18,88,0,0,95,144,2,17,36,36,144,2,16,36,36,144,2,16,36,36,16,
-20,2,3,2,2,2,5,2,2,2,4,2,2,2,6,2,2,2,7,2,2,
-2,8,2,2,2,9,2,2,2,10,2,2,2,11,2,2,2,12,2,2,97,
+20,2,3,2,2,2,4,2,2,2,5,2,2,2,6,2,2,2,7,2,2,
+2,8,2,2,2,11,2,2,2,10,2,2,2,9,2,2,2,12,2,2,97,
 37,11,8,240,18,88,0,0,93,144,2,16,36,37,16,2,2,13,146,2,2,
-37,2,13,2,2,2,13,96,11,11,8,240,18,88,0,0,16,0,96,38,11,
+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,
-2,2,11,11,11,8,32,8,31,8,30,8,29,27,248,22,164,4,195,249,22,
-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,
-22,144,18,199,249,22,80,2,11,248,22,145,18,201,11,18,100,10,13,16,6,
+2,2,11,11,11,8,32,8,31,8,30,8,29,27,248,22,166,4,195,249,22,
+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,
 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,
-101,110,118,49,55,54,55,56,27,248,22,82,248,22,164,4,196,28,248,22,88,
-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,
-2,23,248,22,144,18,201,251,22,90,2,18,2,23,2,23,249,22,80,2,6,
-248,22,145,18,204,18,100,11,13,16,6,36,2,14,2,2,11,11,11,8,32,
+101,110,118,49,55,54,55,56,27,248,22,84,248,22,166,4,196,28,248,22,90,
+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,
 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,
-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,
-90,2,10,248,22,90,248,22,81,199,250,22,91,2,9,248,22,145,18,201,248,
-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,
+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,
 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,
-101,116,45,102,105,114,115,116,11,2,26,202,250,22,91,2,22,9,248,22,82,
-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,
-22,90,21,93,2,27,248,22,81,199,250,22,91,2,5,249,22,90,2,27,249,
-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,
-22,91,2,22,9,248,22,145,18,200,249,22,80,2,5,248,22,82,202,99,13,
+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,
 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,
-27,248,22,82,248,22,164,4,196,249,22,157,4,80,143,39,36,28,248,22,64,
-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,
+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,
 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,
@@ -83,24 +83,24 @@
 0,16,0,36,36,11,12,11,11,16,0,16,0,16,0,36,36,16,11,16,5,
 11,20,15,16,2,20,14,144,36,36,37,80,143,36,36,36,20,114,144,36,16,
 1,2,13,16,1,33,33,10,16,5,2,12,88,148,8,36,37,53,37,9,223,
-0,33,34,36,20,114,144,36,16,1,2,13,16,0,11,16,5,2,3,88,148,
+0,33,34,36,20,114,144,36,16,1,2,13,16,0,11,16,5,2,8,88,148,
 8,36,37,53,37,9,223,0,33,35,36,20,114,144,36,16,1,2,13,16,0,
-11,16,5,2,11,88,148,8,36,37,53,37,9,223,0,33,36,36,20,114,144,
-36,16,1,2,13,16,1,33,37,11,16,5,2,6,88,148,8,36,37,56,37,
+11,16,5,2,6,88,148,8,36,37,53,37,9,223,0,33,36,36,20,114,144,
+36,16,1,2,13,16,1,33,37,11,16,5,2,7,88,148,8,36,37,56,37,
 9,223,0,33,38,36,20,114,144,36,16,1,2,13,16,1,33,39,11,16,5,
 2,10,88,148,8,36,37,58,37,9,223,0,33,42,36,20,114,144,36,16,1,
-2,13,16,0,11,16,5,2,8,88,148,8,36,37,53,37,9,223,0,33,44,
-36,20,114,144,36,16,1,2,13,16,0,11,16,5,2,9,88,148,8,36,37,
+2,13,16,0,11,16,5,2,4,88,148,8,36,37,53,37,9,223,0,33,44,
+36,20,114,144,36,16,1,2,13,16,0,11,16,5,2,5,88,148,8,36,37,
 54,37,9,223,0,33,45,36,20,114,144,36,16,1,2,13,16,0,11,16,5,
-2,4,88,148,8,36,37,56,37,9,223,0,33,46,36,20,114,144,36,16,1,
-2,13,16,0,11,16,5,2,5,88,148,8,36,37,58,37,9,223,0,33,47,
-36,20,114,144,36,16,1,2,13,16,1,33,49,11,16,5,2,7,88,148,8,
+2,9,88,148,8,36,37,56,37,9,223,0,33,46,36,20,114,144,36,16,1,
+2,13,16,0,11,16,5,2,11,88,148,8,36,37,58,37,9,223,0,33,47,
+36,20,114,144,36,16,1,2,13,16,1,33,49,11,16,5,2,3,88,148,8,
 36,37,54,37,9,223,0,33,50,36,20,114,144,36,16,1,2,13,16,0,11,
 16,0,94,2,16,2,17,93,2,16,9,9,36,9,0};
     EVAL_ONE_SIZED_STR((char *)expr, 2051);
   }
   {
-    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,54,46,48,46,48,46,52,84,0,0,0,0,0,0,0,0,0,0,
+    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,54,46,48,46,49,46,50,84,0,0,0,0,0,0,0,0,0,0,
 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,
-45,100,105,114,115,6,8,8,99,111,108,108,101,99,116,115,27,248,22,160,15,
-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,
+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,
 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,
-248,22,161,15,23,195,2,10,28,248,22,160,15,23,195,2,10,28,248,22,151,
-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,
+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,
 92,91,63,93,92,92,92,92,85,78,67,92,92,92,92,34,86,95,28,28,28,
-248,22,160,15,23,195,2,10,28,248,22,151,7,23,195,2,28,248,22,183,15,
-23,195,2,10,248,22,184,15,23,195,2,11,10,248,22,161,15,23,195,2,12,
-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,
-10,248,22,184,15,23,196,2,11,10,248,22,161,15,23,196,2,12,252,22,176,
-11,2,5,2,45,37,23,199,2,23,200,2,27,28,248,22,161,15,23,196,2,
-248,22,162,15,23,196,2,247,22,163,15,86,95,28,28,248,22,185,15,23,196,
-2,10,249,22,167,9,247,22,163,15,23,195,2,12,253,22,178,11,2,5,6,
+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,
 54,54,112,97,116,104,32,105,115,32,110,111,116,32,99,111,109,112,108,101,116,
 101,32,97,110,100,32,110,111,116,32,116,104,101,32,112,108,97,116,102,111,114,
 109,39,115,32,99,111,110,118,101,110,116,105,111,110,2,46,23,201,2,6,24,
 24,112,108,97,116,102,111,114,109,32,99,111,110,118,101,110,116,105,111,110,32,
-116,121,112,101,247,22,163,15,28,249,22,167,9,28,248,22,161,15,23,199,2,
-248,22,162,15,23,199,2,247,22,163,15,23,195,2,12,253,22,178,11,2,5,
+116,121,112,101,247,22,165,15,28,249,22,169,9,28,248,22,163,15,23,199,2,
+248,22,164,15,23,199,2,247,22,165,15,23,195,2,12,253,22,180,11,2,5,
 6,37,37,103,105,118,101,110,32,112,97,116,104,115,32,117,115,101,32,100,105,
 102,102,101,114,101,110,116,32,99,111,110,118,101,110,116,105,111,110,115,2,46,
 23,201,2,6,9,9,114,111,111,116,32,112,97,116,104,23,202,2,27,27,248,
-22,189,15,28,248,22,185,15,23,199,2,23,198,1,248,22,186,15,23,199,1,
-86,94,28,28,248,22,161,15,23,194,2,10,28,248,22,160,15,23,194,2,10,
-28,248,22,151,7,23,194,2,28,248,22,183,15,23,194,2,10,248,22,184,15,
-23,194,2,11,12,250,22,176,11,2,41,2,42,23,196,2,28,28,248,22,161,
-15,23,194,2,249,22,167,9,248,22,162,15,23,196,2,2,43,249,22,167,9,
-247,22,178,8,2,43,27,28,248,22,151,7,23,195,2,23,194,2,248,22,163,
-8,248,22,165,15,23,196,2,28,249,22,156,16,2,78,23,195,2,28,248,22,
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+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,
-22,178,15,248,22,137,16,2,61,250,22,158,2,23,205,1,2,59,247,22,169,
-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,
+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,
 144,80,144,39,43,37,26,9,80,144,48,44,37,249,22,33,11,80,144,50,43,
-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,
+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,
 23,197,2,86,95,23,196,1,23,195,1,23,197,1,86,94,23,197,1,27,248,
-22,137,16,2,56,27,250,80,144,42,40,39,23,197,1,11,11,27,248,22,139,
+22,139,16,2,56,27,250,80,144,42,40,39,23,197,1,11,11,27,248,22,141,
 4,23,199,1,27,28,23,194,2,23,194,1,86,94,23,194,1,36,27,248,22,
-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,
+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,
 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,
-249,22,153,7,7,92,7,92,80,144,36,37,37,20,15,16,2,88,148,8,36,
+249,22,155,7,7,92,7,92,80,144,36,37,37,20,15,16,2,88,148,8,36,
 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,
-144,36,40,37,20,15,16,2,27,248,22,148,16,248,22,165,8,27,28,249,22,
-167,9,247,22,178,8,2,43,6,1,1,59,6,1,1,58,250,22,135,8,6,
+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,
 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,
-24,37,20,15,16,2,247,22,140,2,80,144,36,8,25,37,20,15,16,2,248,
+24,37,20,15,16,2,247,22,142,2,80,144,36,8,25,37,20,15,16,2,248,
 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[] = {35,126,7,54,46,48,46,48,46,52,84,0,0,0,0,0,0,0,0,0,0,
+    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,54,46,48,46,49,46,50,84,0,0,0,0,0,0,0,0,0,0,
 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,
-0,16,0,36,36,16,3,20,15,16,6,253,22,185,10,2,3,11,38,36,11,
-248,22,90,249,22,80,22,172,10,88,148,36,37,45,44,9,223,9,33,9,80,
+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,
 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[] = {35,126,7,54,46,48,46,48,46,52,84,0,0,0,0,0,0,0,0,0,0,
+    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,54,46,48,46,49,46,50,84,0,0,0,0,0,0,0,0,0,0,
 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,
-116,6,4,4,46,114,107,116,67,105,103,110,111,114,101,100,250,22,178,15,28,
-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,
+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,
 199,1,23,201,1,23,200,1,249,80,144,43,43,39,23,198,1,2,30,250,22,
-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,
+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,
 42,39,23,199,1,23,201,1,23,200,1,249,80,144,43,43,39,23,198,1,2,
-30,252,22,178,15,28,249,22,167,9,23,203,2,2,29,86,94,23,201,1,23,
-199,1,28,248,22,183,15,23,202,2,249,22,178,15,23,201,1,23,203,1,249,
-80,144,45,42,39,23,201,1,23,203,1,23,202,1,2,31,247,22,179,8,249,
-80,144,45,43,39,23,200,1,80,144,45,36,38,252,22,178,15,28,249,22,167,
-9,23,203,2,2,29,86,94,23,201,1,23,199,1,28,248,22,183,15,23,202,
-2,249,22,178,15,23,201,1,23,203,1,249,80,144,45,42,39,23,201,1,23,
-203,1,23,202,1,2,31,247,22,179,8,249,80,144,45,43,39,23,200,1,80,
-144,45,36,38,27,252,22,178,15,28,249,22,167,9,23,201,2,2,29,86,94,
-23,199,1,23,201,1,28,248,22,183,15,23,200,2,249,22,178,15,23,203,1,
+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,
+144,45,36,38,27,252,22,180,15,28,249,22,169,9,23,201,2,2,29,86,94,
+23,199,1,23,201,1,28,248,22,185,15,23,200,2,249,22,180,15,23,203,1,
 23,201,1,249,80,144,47,42,39,23,203,1,23,201,1,23,203,1,2,31,247,
-22,179,8,249,80,144,47,43,39,23,202,1,80,144,47,36,38,27,250,22,132,
-16,196,11,32,0,88,148,8,36,36,41,11,9,222,11,28,192,249,22,80,195,
+22,181,8,249,80,144,47,43,39,23,202,1,80,144,47,36,38,27,250,22,134,
+16,196,11,32,0,88,148,8,36,36,41,11,9,222,11,28,192,249,22,82,195,
 194,11,249,22,5,20,20,96,88,148,8,36,37,54,8,129,3,9,226,5,3,
-2,6,33,48,23,199,1,23,195,1,23,196,1,23,197,1,27,252,22,178,15,
-28,249,22,167,9,23,201,2,2,29,86,94,23,199,1,23,201,1,28,248,22,
-183,15,23,200,2,249,22,178,15,23,203,1,23,201,1,249,80,144,47,42,39,
-23,203,1,23,201,1,23,203,1,2,31,247,22,179,8,249,80,144,47,43,39,
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-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,
+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,
 86,94,23,196,1,27,248,80,144,43,8,30,39,23,202,2,27,248,80,144,44,
-48,39,249,22,80,23,200,2,23,197,2,28,23,193,2,192,86,94,23,193,1,
+48,39,249,22,82,23,200,2,23,197,2,28,23,193,2,192,86,94,23,193,1,
 90,144,38,11,89,146,38,36,11,249,80,144,47,54,39,23,201,2,11,250,22,
-1,22,178,15,23,199,1,249,22,94,249,22,2,32,0,88,148,8,36,37,44,
-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,
+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,
 94,23,193,1,90,144,39,11,89,146,38,36,11,249,80,144,47,54,39,248,22,
-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,
+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,
 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,
-248,22,177,16,247,22,130,14,86,94,249,22,3,20,20,94,88,148,8,36,37,
+248,22,179,16,247,22,132,14,86,94,249,22,3,20,20,94,88,148,8,36,37,
 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,
-1,12,28,28,248,22,182,8,23,204,1,11,28,248,22,151,7,23,206,2,10,
-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,
+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,
 23,206,1,23,204,1,23,203,1,12,192,86,96,20,18,144,11,80,143,36,56,
-248,80,144,37,8,28,37,249,22,33,11,80,144,39,58,37,248,22,189,4,80,
-144,37,57,38,248,22,175,5,80,144,37,37,39,248,22,129,15,80,144,37,45,
+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,
 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,
-248,22,178,8,69,115,111,45,115,117,102,102,105,120,80,144,36,36,37,20,15,
+248,22,180,8,69,115,111,45,115,117,102,102,105,120,80,144,36,36,37,20,15,
 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,
-15,16,2,247,22,141,2,80,144,36,41,37,20,15,16,2,8,128,8,80,144,
-36,46,37,20,15,16,2,249,22,183,8,8,128,8,11,80,144,36,47,37,20,
+15,16,2,247,22,143,2,80,144,36,41,37,20,15,16,2,8,128,8,80,144,
+36,46,37,20,15,16,2,249,22,185,8,8,128,8,11,80,144,36,47,37,20,
 15,16,2,88,148,8,36,37,50,8,128,32,2,14,223,0,33,58,80,144,36,
 48,37,20,15,16,2,88,148,8,36,38,55,8,128,32,2,15,223,0,33,59,
-80,144,36,49,37,20,15,16,2,247,22,76,80,144,36,50,37,20,15,16,2,
+80,144,36,49,37,20,15,16,2,247,22,78,80,144,36,50,37,20,15,16,2,
 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[] = {35,126,7,54,46,48,46,48,46,52,84,0,0,0,0,0,0,0,0,0,0,
+    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,7,54,46,48,46,49,46,50,84,0,0,0,0,0,0,0,0,0,0,
 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 6b18d35f38..37d00c7cfd 100644
--- a/racket/src/racket/src/env.c
+++ b/racket/src/racket/src/env.c
@@ -249,6 +249,7 @@ Scheme_Env *scheme_engine_instance_init()
 
   scheme_init_portable_case();
   scheme_init_compenv();
+  scheme_init_letrec_check();
   scheme_init_optimize();
   scheme_init_resolve();
   scheme_init_sfs();
diff --git a/racket/src/racket/src/eval.c b/racket/src/racket/src/eval.c
index 7c0db9403c..bc26e97e04 100644
--- a/racket/src/racket/src/eval.c
+++ b/racket/src/racket/src/eval.c
@@ -4061,6 +4061,8 @@ static void *compile_k(void)
 	  break;
       }
 
+      o = scheme_letrec_check_expr(o);
+
       oi = scheme_optimize_info_create(cenv->prefix, 1);
       scheme_optimize_info_enforce_const(oi, enforce_consts);
       if (!(comp_flags & COMP_CAN_INLINE))
diff --git a/racket/src/racket/src/fun.c b/racket/src/racket/src/fun.c
index 108fa99322..ef71fc5501 100644
--- a/racket/src/racket/src/fun.c
+++ b/racket/src/racket/src/fun.c
@@ -86,6 +86,7 @@ READ_ONLY Scheme_Object *scheme_values_func; /* the function bound to `values' *
 READ_ONLY Scheme_Object *scheme_procedure_p_proc;
 READ_ONLY Scheme_Object *scheme_procedure_arity_includes_proc;
 READ_ONLY Scheme_Object *scheme_void_proc;
+READ_ONLY Scheme_Object *scheme_check_not_undefined;
 READ_ONLY Scheme_Object *scheme_apply_proc;
 READ_ONLY Scheme_Object *scheme_call_with_values_proc; /* the function bound to `call-with-values' */
 READ_ONLY Scheme_Object *scheme_reduced_procedure_struct;
@@ -160,6 +161,7 @@ static Scheme_Object *extract_one_cc_mark (int argc, Scheme_Object *argv[]);
 static Scheme_Object *call_with_immediate_cc_mark (int argc, Scheme_Object *argv[]);
 static Scheme_Object *void_func (int argc, Scheme_Object *argv[]);
 static Scheme_Object *void_p (int argc, Scheme_Object *argv[]);
+static Scheme_Object *check_not_undefined (int argc, Scheme_Object *argv[]);
 static Scheme_Object *dynamic_wind (int argc, Scheme_Object *argv[]);
 #ifdef TIME_SYNTAX
 static Scheme_Object *time_apply(int argc, Scheme_Object *argv[]);
@@ -490,6 +492,14 @@ 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);
+  scheme_check_not_undefined = scheme_make_prim_w_arity(check_not_undefined, "check-not-undefined", 2, 2);
+  scheme_add_global_constant("check-not-undefined", scheme_check_not_undefined, 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,
@@ -2523,6 +2533,23 @@ void_p (int argc, Scheme_Object *argv[])
   return SAME_OBJ(argv[0], scheme_void) ? scheme_true : scheme_false;
 }
 
+static Scheme_Object *
+check_not_undefined (int argc, Scheme_Object *argv[])
+{
+  if (!SCHEME_SYMBOLP(argv[1]))
+    scheme_wrong_contract("check-not-undefined", "symbol?", 1, argc, argv);
+
+  if (SAME_OBJ(argv[0], scheme_undefined)) {
+    scheme_raise_exn(MZEXN_FAIL_CONTRACT_VARIABLE,
+                     argv[1],
+                     "%S: variable used before its definition",
+                     argv[1]);
+  }
+
+  return argv[0];
+}
+
+
 static Scheme_Object *
 procedure_p (int argc, Scheme_Object *argv[])
 {
diff --git a/racket/src/racket/src/letrec_check.c b/racket/src/racket/src/letrec_check.c
new file mode 100644
index 0000000000..0875ef83ab
--- /dev/null
+++ b/racket/src/racket/src/letrec_check.c
@@ -0,0 +1,1854 @@
+/*
+  Racket
+  Copyright (c) 2004-2013 PLT Design Inc.
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public
+    License along with this library; if not, write to the Free
+    Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301 USA.
+
+*/
+
+#include "schpriv.h"
+
+#ifdef MZ_PRECISE_GC
+static void register_traversers(void);
+#endif
+
+void scheme_init_letrec_check()
+{
+#ifdef MZ_PRECISE_GC
+    register_traversers();
+#endif
+}
+
+#define DEBUG_LEVEL 0
+#define DEBUG(stmt) if (DEBUG_LEVEL) { stmt; }
+#define VERBOSE_DEBUG(stmt) if (DEBUG_LEVEL > 1) { stmt; }
+#define MODNAME_DEBUG(stmt) if (0 || (DEBUG_LEVEL > 1)) { stmt; }
+
+#define LET_RHS_EXPR   0x1
+#define LET_BODY_EXPR (0x1 << 1)
+#define LET_NO_EXPR   (0x1 << 2)
+
+#define FRAME_TYPE_LETREC   0x1
+#define FRAME_TYPE_LETSTAR (0x1 << 1)
+#define FRAME_TYPE_LET     (0x1 << 2)
+#define FRAME_TYPE_CLOSURE (0x1 << 3)
+
+typedef Scheme_Object Wrapped_Lhs;
+
+/* struct where all mutable information is stored during this pass! */
+typedef struct Letrec_Check_Frame {
+    MZTAG_IF_REQUIRED
+
+    /* whether this is a frame for a letrec, let*, let, or closure */
+    int frame_type; 
+    
+    /* TODO: should this really be an mzshort? */
+    /* total number of bindings in this frame */
+    int count;
+
+    /* number of deferred expressions that must be processed before
+       the let can be finished */
+    int waiting;
+
+    /* table of lists of deferred sub expressions for each bound
+       variable we count all variables here (not just letrec bound
+       variables) because we still need to jump over them */
+    Scheme_Object **def;
+
+    /* which sub-expression of a letrec we are in, so that we know
+       what to record when we find a reference to a local reference */
+    int subexpr;
+
+    /* we also need to track which variables are referenced so that
+       letrecs can track what variables appear in bodies and RHS.
+       this array is always num_bindings long, and indexed by the
+       position of local references */
+    int *ref;
+
+    /* we need to track which variables we actually add checks around
+       so we can update the flags for those variables */
+    int *checked;
+
+    /* so we can fix the flags afterwards */
+    Scheme_Let_Header *head;
+
+    Scheme_Object *deferred_with_rhs_ref;
+    Scheme_Object *deferred_with_body_ref;
+    Scheme_Object *deferred_with_no_ref;
+
+    struct Letrec_Check_Frame *next;
+} Letrec_Check_Frame;
+
+/* a deferred expression, these are inserted and completely removed by
+   the letrec_check pass */
+typedef struct { 
+    Scheme_Object so;
+
+    /* the expression that has been deferred */
+    Scheme_Closure_Data *expr;
+
+    /* the frame that existed when the expr was deferred */
+    Letrec_Check_Frame *frame;
+
+    /* the position of the LHS variable associated with this deferred
+       RHS binding sub-expression */
+    int position;
+
+    /* the environment; i.e. the states of the variables in enclosing
+       letrecs at the point of deferral */
+    Scheme_Object *uvars;
+    Scheme_Object *pvars;
+
+    /* keeps track of the subexpressions of all frames so they can be
+       set back to the correct values upon un-deferral */
+    Scheme_Object *subexpr_ls;
+
+} Scheme_Deferred_Expr;
+
+void print_frame(Letrec_Check_Frame *frame)
+{
+    fflush(stdout);
+
+    printf("frame: [ ");
+    while(frame != NULL) {
+      printf("[%d %d %d] ", frame->frame_type, frame->count, (int)SCHEME_INT_VAL(frame->subexpr));
+        frame = frame->next;
+    }
+    printf("]");
+}
+
+/* initializes a Letrec_Check_Frame */
+Letrec_Check_Frame *init_letrec_check_frame(int frame_type, 
+                                            mzshort count, 
+                                            Letrec_Check_Frame *prev,
+                                            Scheme_Let_Header *head)
+{
+    Letrec_Check_Frame *frame;
+    Scheme_Object **def;
+    int *ref, *checked, i;
+
+    frame = (Letrec_Check_Frame *)MALLOC_ONE_RT(Letrec_Check_Frame);
+#ifdef MZTAG_REQUIRED
+    frame->type = scheme_rt_letrec_check_frame;
+#endif
+    
+    frame->frame_type = frame_type;
+    
+    frame->count = count;
+    frame->next = prev;
+    frame->waiting = 0;
+
+    frame->head = head;
+
+    /* def will be a table of lists so every entry should be
+       initialized to scheme_null */
+    def = MALLOC_N(Scheme_Object *, count);
+    for(i = 0; i < count; i++) { def[i] = scheme_null; }
+    frame->def = def;
+
+    /* the sub-expression of the letrec (if we're in a letrec),
+       i.e. the RHS or the body.  this is for tracking where LHS
+       variables are referenced */
+    if (frame_type == FRAME_TYPE_CLOSURE) {
+        frame->subexpr = 2;
+    }
+    else {
+        frame->subexpr = -1;
+    }
+
+    /* ref is a table of flags, 0 for unreferenced, 1-3 for referenced
+       in the body and/or the RHS */
+    ref = MALLOC_N(int, count);
+    for(i = count; i--;) { ref[i] = 0; }
+    frame->ref = ref;
+
+    /* checked is a table of 0s or 1s, whether or not a LHS variable
+       had a check added around it */
+    checked = MALLOC_N(int, count);
+    for(i = count; i--;) { checked[i] = 0; }
+    frame->checked = checked;
+
+    frame->deferred_with_rhs_ref = scheme_false;
+    frame->deferred_with_body_ref = scheme_false;
+    frame->deferred_with_no_ref = scheme_false;
+
+    if (DEBUG_LEVEL > 1) {
+        printf("init_letrec_check_frame: type: %d; ", frame->frame_type);
+        print_frame(frame->next);
+        printf(" -> ");
+        print_frame(frame);
+        printf("\n"); 
+    }
+
+#ifdef MZTAG_REQUIRED
+        if (frame->type != scheme_rt_letrec_check_frame) {
+            scheme_signal_error("init_letrec_check_frame: frame is not a frame");
+        }
+        if ((prev != NULL) && (prev->type != scheme_rt_letrec_check_frame)) {
+            scheme_signal_error("init_letrec_check_frame: frame is not a frame");
+        }
+#endif
+        
+    return frame;
+}
+
+/* returns the frame that is the nearest enclosing let in the
+   LET_RHS_EXPR */
+Letrec_Check_Frame *get_nearest_rhs(Letrec_Check_Frame *frame) {
+    for (; frame != NULL; frame = frame->next) {
+        if (frame->subexpr < 0) {
+            scheme_signal_error("get_nearest_rhs: subexpr is negative");
+        }
+        if ((frame->subexpr & LET_RHS_EXPR) &&
+            (frame->frame_type & FRAME_TYPE_LETREC))
+            { return frame; }
+    }
+    
+    scheme_signal_error("get_nearest_rhs: not in a let RHS");
+    return frame; // dead
+}
+
+/* returns the frame that was created when pos was created, and
+   changes pos to be relative to that frame */
+Letrec_Check_Frame *get_relative_frame(int *pos, Letrec_Check_Frame *frame)
+{
+    if (DEBUG_LEVEL > 1) {
+        printf("get_relative_frame\n pos_int: %d\n ", *pos);
+        print_frame(frame);
+        printf("\n");
+    }
+
+    /* we've gone wrong if pos_int is negative or if the frame has
+       become NULL because pos should have be a valid LHS variable
+       reference */
+    if (*pos < 0)
+        scheme_signal_error("get_relative_frame: pos is negative");
+    if (frame == NULL) {
+        scheme_signal_error("get_relative_frame: frame is NULL");
+    }
+
+    if (frame->subexpr < 0) {
+        scheme_signal_error("get_relative_frame: subexpr is negative");
+    }
+
+    /* if we're in the RHS of a let, no bindings for the LHS variables
+       have been pushed yet, pos can't possibly be in this frame.  so
+       don't do any offsetting and look in the next frame */
+    if ((frame->frame_type & FRAME_TYPE_LET) &&
+        (frame->subexpr & LET_RHS_EXPR)) {
+        return get_relative_frame(pos, frame->next);
+    }
+    else {
+        if (*pos >= frame->count) {
+            /* we're not in the right frame yet, so offset pos by the
+               number of bindings in this frame */
+            (*pos) -= frame->count;
+            return get_relative_frame(pos, frame->next);
+        }
+    }
+    
+    return frame;
+}
+
+/* takes an absolute position and returns whether or not that position
+   has a reference of the right type */
+int pos_has_ref(int position, Letrec_Check_Frame *frame, int type)
+{
+    int pos_ref = position;
+
+    if (type & LET_NO_EXPR) {
+        return 1;
+    }
+    else {
+        frame = get_relative_frame(&pos_ref, frame);
+        return ((frame->ref)[pos_ref] & type);
+    }
+}
+
+/* adds expr to the deferred bindings of lhs */
+void update_frame(Letrec_Check_Frame *outer, Letrec_Check_Frame *inner, 
+                  int position, Scheme_Deferred_Expr *clos)
+{
+    Scheme_Object *prev_def;
+
+    DEBUG(printf("deferring closure at position %d\n", position));
+    if (DEBUG_LEVEL > 1) {
+        printf(" outer: ");
+        print_frame(outer);
+        printf("\n inner: ");
+        print_frame(inner);
+        printf("\n");
+    }
+
+    if (position >= outer->count) {
+        scheme_signal_error("update_frame: position exceeds binding count");
+    }
+
+    /* put the deferred expression in the right place */
+    prev_def = (outer->def)[position];
+    prev_def = scheme_make_pair((Scheme_Object *)clos, prev_def); 
+    (outer->def)[position] = prev_def; 
+     
+    /* increment the waiting count between the current frame and the
+       outer frame */
+    for (; outer != inner; inner = inner->next) {
+        (inner->waiting)++;
+    }
+    
+    return;
+}
+
+/* records all the subexprs at the time of deferral */
+Scheme_Object *frame_to_subexpr_ls(Letrec_Check_Frame *frame) {
+    Scheme_Object *ls = scheme_null;
+
+    for (; frame != NULL; frame = frame->next) {
+        if (frame->subexpr < 0) {
+            print_frame(frame);
+            printf("\n");
+            scheme_signal_error("frame_to_subexpr_ls: frame->subexpr is negative");
+        }
+        ls = scheme_make_pair(scheme_make_integer(frame->subexpr), ls);
+    }
+    
+    return scheme_reverse(ls);
+}
+
+/* replaces all the subexprs to their state pre-deferral */
+void subexpr_ls_to_frame(Scheme_Object *ls, Letrec_Check_Frame *frame) {
+    for (; frame != NULL; frame = frame->next) {
+        if (SCHEME_CAR(ls) < 0) {
+            scheme_signal_error("subexpr_ls_to_frame: negative subexpr in list");
+        }
+        if (SCHEME_NULLP(ls)) {
+            scheme_signal_error("subexpr_ls_to_frame: ls is null");
+        }
+        frame->subexpr = SCHEME_INT_VAL(SCHEME_CAR(ls));
+        ls = SCHEME_CDR(ls);
+    }
+    
+    return;
+}
+
+/* creates a deferred expression "closure" by closing over the frame,
+   and uvars/pvars at the point of deferral */
+Scheme_Deferred_Expr *make_deferred_expr_closure(Scheme_Closure_Data *expr, Letrec_Check_Frame *frame, 
+                                                 int position, Scheme_Object *uvars, Scheme_Object *pvars)
+{
+    Scheme_Deferred_Expr *clos;
+
+    Scheme_Object *subexpr_ls;
+    subexpr_ls = frame_to_subexpr_ls(frame);
+
+    clos = MALLOC_ONE_RT(Scheme_Deferred_Expr);
+    clos->so.type = scheme_deferred_expr_type;
+    clos->expr = expr;
+    clos->frame = frame;
+    clos->position = position;
+    clos->uvars = uvars;
+    clos->pvars = pvars;
+    clos->subexpr_ls = subexpr_ls;
+
+    return clos;
+}
+
+Scheme_Object *letrec_check_expr(Scheme_Object *, Letrec_Check_Frame *, 
+                                 Scheme_Object *, Scheme_Object *, Scheme_Object *);
+void process_deferred_bindings(Letrec_Check_Frame *);
+
+void letrec_check_lets_resume(Letrec_Check_Frame *frame)
+{
+    Scheme_Compiled_Let_Value *clv;
+    Scheme_Object *body;
+    int i, j, k, *clv_flags;
+    Scheme_Let_Header *head;
+    int was_checked;
+
+    DEBUG(printf("letrec_check_lets_resume\n "));
+
+#ifdef MZTAG_REQUIRED
+    if (frame->type != scheme_rt_letrec_check_frame) {
+        scheme_signal_error("letrec_check_lets_resume: frame is not a frame");
+    }
+#endif
+
+    head = frame->head;
+
+    DEBUG(print_frame(frame));
+    DEBUG(printf("\n attempting to resume, waiting is %d\n", frame->waiting));
+
+    if (frame->waiting != 0) { 
+        return; 
+    }
+
+    frame->subexpr = LET_BODY_EXPR;
+    process_deferred_bindings(frame);
+    frame->subexpr = -1;
+    
+    frame->subexpr = LET_NO_EXPR;
+    process_deferred_bindings(frame);
+    frame->subexpr = -1;
+
+    body = head->body;
+    if (frame->frame_type == FRAME_TYPE_LETREC) {
+        DEBUG(printf("updating flags\n"));
+        /* loops through every right hand side again to update the flags
+           that we have invalidated; i.e., adding check-undefineds around
+           references means there is one (more) instance where the LHS
+           variable is not used in application position */
+        k = head->count;
+        for (i = head->num_clauses; i--;) {
+            clv = (Scheme_Compiled_Let_Value *) body;
+            clv_flags = clv->flags;
+            k -= clv->count;
+            for (j = 0; j < clv->count; j++) {
+                was_checked = frame->checked[k + j];
+                if (was_checked) {
+                    DEBUG(printf("%d had check inserted\n", k));
+                    clv_flags[j] -= (clv_flags[j] & SCHEME_WAS_ONLY_APPLIED);
+                    clv_flags[j] -= (clv_flags[j] & SCHEME_WAS_APPLIED_EXCEPT_ONCE);
+                } 
+            }
+            clv->flags = clv_flags;
+            clv->names = NULL; /* not used in later passes */
+            body = clv->body;
+        }
+    }
+
+    return;
+}
+
+void print_vars(Scheme_Object *vars)
+{
+    fflush(stdout);
+    scheme_display(vars, scheme_orig_stdout_port);
+    scheme_flush_output(scheme_orig_stdout_port);
+
+    return;
+}
+
+
+/* appends two nested lists of variables that are always the same length, e.x.
+   merge_vars( ((1) () (0)) , (() (2) (1)) ) => ((1) (2) (0 1)) */
+Scheme_Object *merge_vars(Scheme_Object *vars1, Scheme_Object *vars2) {
+    Scheme_Object *merged, *car1, *car2, *appended_cars, *tmp;
+
+    /* make sure they are the same length */
+    if (scheme_proper_list_length(vars1) !=
+        scheme_proper_list_length(vars2)) {
+        scheme_signal_error("arguments to merge_vars are not the same length");
+    }
+
+    merged = scheme_null;
+    while (!SCHEME_NULLP(vars1)) {
+        if (SCHEME_NULLP(vars2)) {
+            scheme_wrong_contract("merge_vars", "same-length?", -1, 0, &vars2);
+        }
+
+        car1 = SCHEME_CAR(vars1);
+        car2 = SCHEME_CAR(vars2);
+
+        appended_cars = scheme_append(car1, car2);
+        merged = scheme_make_pair(appended_cars, merged);
+
+        vars1 = SCHEME_CDR(vars1);
+        vars2 = SCHEME_CDR(vars2);
+    }
+
+    tmp = scheme_reverse(merged);
+    return tmp;
+}
+
+void check_inner_vars(Scheme_Object *ls) {
+    while(!SCHEME_NULLP(ls)) {
+        if (!SCHEME_PAIRP(ls)) {
+            scheme_signal_error("check_inner_vars: vars is not a list");
+        }
+        ls = SCHEME_CDR(ls);
+    }
+    return;
+}
+
+void check_vars(Scheme_Object *vars) {
+    DEBUG(printf("check_vars\n"));
+
+    while(!SCHEME_NULLP(vars)) {
+        if (!SCHEME_PAIRP(vars)) {
+            scheme_signal_error("check_vars: vars is not a list");
+        }
+        check_inner_vars(SCHEME_CAR(vars));
+        vars = SCHEME_CDR(vars);
+    }
+
+    return;
+}
+
+/* looks up an absolute position in a nested list of vars, where we
+   only care about the outermost dimension; e.x.:
+
+   lookup_var(1, ((1) ...)) = 1
+   lookup_var(1, (() ...)) = 0
+   lookup_var(2, ((1) ...)) = 0
+*/
+int lookup_var(int position, Scheme_Object *vars, Letrec_Check_Frame *frame) 
+{
+    Scheme_Object *vars_car, *caar;
+    
+    check_vars(vars);
+
+    if (frame == NULL) {
+        scheme_signal_error("lookup_var: frame == NULL");
+        return 0;
+    }
+
+    if (DEBUG_LEVEL > 1) {
+        printf("lookup_var: %d in ", position);
+        print_vars(vars);
+        printf(" and ");
+        print_frame(frame);
+        printf("\n");
+    }
+
+    if (SCHEME_NULLP(vars)) {
+        return 0;
+    }
+
+    if (frame->subexpr < 0) {
+        scheme_signal_error("lookup_var: subexpr is negative");
+    }
+
+    /* if we're in the RHS of a let, there are no bindings pushed yet
+       so we don't have to do any offsetting */
+    if ((frame->frame_type == FRAME_TYPE_LET) &&
+        (frame->subexpr & LET_RHS_EXPR)) {
+        return lookup_var(position, vars, frame->next);
+    }
+    if (position >= frame->count) {
+        /* we're not in the right frame yet, so offset pos by the
+           number of bindings in this frame */
+        position -= frame->count;
+
+        /* if is is not a letrec, or we are in the body of the letrec,
+           there are no uvars/pvars for this frame, so don't cdr */
+        if ((frame->frame_type != FRAME_TYPE_LETREC) ||
+            (frame->subexpr & LET_BODY_EXPR)) {
+            return lookup_var(position, vars, frame->next);
+        } 
+        else { 
+            if (SCHEME_NULLP(vars)) {
+                scheme_signal_error("lookup_var: vars is null");
+            }
+            return lookup_var(position, SCHEME_CDR(vars), frame->next); 
+        }
+    }
+
+    if (frame->frame_type == FRAME_TYPE_LETREC) {
+        if (frame->subexpr & LET_BODY_EXPR) {
+            VERBOSE_DEBUG(printf(" didn't find %d in vars\n", position));
+            return 0;
+        }
+
+        if (SCHEME_NULLP(vars)) {
+            scheme_signal_error("lookup_var: vars is null");
+        }
+
+        /* we're in the right place, so we just have to check in the
+           car of vars for the int we're looking for */
+        vars_car = SCHEME_CAR(vars);
+        while(!SCHEME_NULLP(vars_car)) {
+            caar = SCHEME_CAR(vars_car);
+            if (SCHEME_INT_VAL(caar) == position) {
+                VERBOSE_DEBUG(printf(" found %d in vars\n", position));
+                return 1;
+            }
+            vars_car = SCHEME_CDR(vars_car);
+        }
+    }
+
+    VERBOSE_DEBUG(printf(" didn't find %d in vars\n", position));
+    return 0;
+}
+
+/* records that we have seen a reference to loc */
+void record_ref(Scheme_Local *loc, Letrec_Check_Frame *frame)
+{
+    Scheme_Object *deferred_with_rhs_ref, *deferred_with_body_ref;
+    Letrec_Check_Frame *inner;
+    int position = SCHEME_LOCAL_POS(loc);
+
+    DEBUG(printf("recording reference for %d\n", position));
+
+    inner = frame;
+    frame = get_relative_frame(&position, frame);
+
+    DEBUG(printf(" checking for LET_NO_EXPR\n"));
+    for(; inner != frame; inner = inner->next) {
+        if (inner->subexpr < 0) {
+            scheme_signal_error("record_ref: subexpr is negative");
+        }
+        if (inner->subexpr & LET_NO_EXPR) {
+            return;
+        }
+    }
+    
+    /* calculate the new flag to indicate we have seen loc in the
+       subexpr of the letrec */
+
+    frame->ref[position] |= frame->subexpr;
+
+    deferred_with_rhs_ref = frame->deferred_with_rhs_ref;
+    deferred_with_body_ref = frame->deferred_with_body_ref;
+    if (!SCHEME_FALSEP(deferred_with_rhs_ref) || 
+        !SCHEME_FALSEP(deferred_with_body_ref)) {
+        Scheme_Object **def, *defls, *tmp;
+
+        DEBUG(printf("record_ref: adding something to a frame deferred list\n"));
+
+        def = frame->def;
+        defls = def[position];
+        
+        if (!SCHEME_FALSEP(deferred_with_rhs_ref)) {
+            tmp = scheme_append(defls, deferred_with_rhs_ref);
+            frame->deferred_with_rhs_ref = tmp;
+        }
+        else {
+            tmp = scheme_append(defls, deferred_with_body_ref);
+            frame->deferred_with_body_ref = tmp;
+        }
+
+        DEBUG(printf("adding %d existing deferred expression(s) to deferred list\n",
+                     scheme_list_length(def[position])));
+
+        (frame->def)[position] = scheme_null;
+    }
+
+    return;
+}
+
+/* records that we have seen a reference to loc */
+Scheme_Object *record_checked(Scheme_Local *loc, Letrec_Check_Frame *frame)
+{
+  int position = SCHEME_LOCAL_POS(loc), k;
+    Scheme_Object *obj;
+
+    frame = get_relative_frame(&position, frame);
+    DEBUG(printf("recording check for (relative position) %d\n", position));
+    DEBUG(print_frame(frame));
+    DEBUG(printf("\n"));
+
+    DEBUG(printf(" old value: %d\n", (frame->checked)[position]));
+
+    (frame->checked)[position] = 1;
+
+    DEBUG(printf(" new value: %d\n", (frame->checked)[position]));
+
+    obj = frame->head->body;
+    k = frame->head->count;
+
+    while (1) {
+      Scheme_Compiled_Let_Value *clv = (Scheme_Compiled_Let_Value *)obj;
+      
+      SCHEME_ASSERT(SAME_TYPE(SCHEME_TYPE(obj), scheme_compiled_let_value_type), "not a clv");
+      SCHEME_ASSERT(position >= 0, "position went negative");
+      
+      k -= clv->count;
+
+      if (position >= k)
+        return clv->names[position - k];
+      
+      obj = clv->body;
+    }
+
+    ESCAPED_BEFORE_HERE;
+}
+
+/* returns another vars list that has the same length but has all
+   empty lists
+   
+   rem_vars( ((1) (1 2) ) ) = (() ()) */
+Scheme_Object *rem_vars(Scheme_Object *vars)
+{
+    Scheme_Object *tmp, *new;
+    DEBUG(printf("rem_vars: removing vars from a list of vars\n"));
+
+    new = scheme_null;
+    tmp = vars;
+    while(!SCHEME_NULLP(tmp)) {
+        if (!SCHEME_PAIRP(tmp)) {
+            scheme_wrong_contract("rem_vars", "list?", -1, 0, &tmp);
+        }
+        new = scheme_make_pair(scheme_null, new);
+        tmp = SCHEME_CDR(tmp);
+    }
+
+    return new;
+}
+
+Scheme_Object *letrec_check_local(Scheme_Object *o, Letrec_Check_Frame *frame,
+                                  Scheme_Object *uvars, Scheme_Object *pvars, 
+                                  Scheme_Object *pos)
+{
+    Scheme_Local *loc = (Scheme_Local *)o;
+    int position;
+
+    DEBUG(printf("letrec_check_local\n"));
+
+    position = SCHEME_LOCAL_POS(loc);
+
+    if (DEBUG_LEVEL > 1) { 
+        printf(" position: %d\n ", position);
+        print_frame(frame);
+        printf("\n uvars: ");
+        print_vars(uvars);
+        printf("\n pvars: ");
+        print_vars(pvars);
+        printf("\n");
+    }
+
+    /* record that we saw this local in the frame, so later we know to
+       process its deferred bindings if there are any */
+    record_ref(loc, frame);
+
+    /* figure out if we need to add a check around this local
+       reference; if it is neither protectable or unprotected, we do
+       not have to add a check. */
+    if (lookup_var(position, uvars, frame) ||
+        lookup_var(position, pvars, frame)) {
+        /* our reference is either unprotectable or protectable, so we
+           need to insert an error check around it */
+        Scheme_App3_Rec *app3;
+        Scheme_Object *name;
+        
+        DEBUG(printf("adding a check around this reference because loc is %d\n", position));
+        name = record_checked(loc, frame);
+        
+        app3 = MALLOC_ONE_TAGGED(Scheme_App3_Rec);
+        app3->iso.so.type = scheme_application3_type;
+        app3->rator = scheme_check_not_undefined;
+        app3->rand1 = o;
+        app3->rand2 = name;
+        
+        return (Scheme_Object *) app3;
+    }
+
+    /* our reference is protected, so we're fine */
+    DEBUG(printf("local was neither unprotected nor protectable\n"));
+    return o;
+}
+
+Scheme_Object *letrec_check_application(Scheme_Object *o, Letrec_Check_Frame *frame, 
+                                        Scheme_Object *uvars, Scheme_Object *pvars, Scheme_Object *pos)
+{
+    int i,n;
+    Scheme_App_Rec *app;
+    Scheme_Object *new_uvars, *new_pvars, *val;
+
+    app = (Scheme_App_Rec *)o;
+
+    /* we'll have to check the rator and all the arguments */
+    n = 1 + app->num_args;
+
+    /* by entering the sub-expressions of an application, all
+       protectable variables are moved to the unprotected state. */
+    new_uvars = merge_vars(uvars, pvars);
+    new_pvars = rem_vars(pvars);
+    pos = scheme_false;
+
+    for (i = 0; i < n; i++) { 
+        val = letrec_check_expr(app->args[i], frame, new_uvars, new_pvars, pos);
+        app->args[i] = val;
+    }
+
+    return o;
+}
+
+Scheme_Object *letrec_check_application2(Scheme_Object *o, Letrec_Check_Frame *frame, 
+                                         Scheme_Object *uvars, Scheme_Object *pvars, Scheme_Object *pos)
+{
+    Scheme_App2_Rec *app;
+    Scheme_Object *new_uvars, *new_pvars, *val;
+
+    app = (Scheme_App2_Rec *)o;
+    
+    /* by entering the sub-expressions of an application, all
+       protectable variables are moved to the unprotected state. */
+    new_uvars = merge_vars(uvars, pvars);
+    new_pvars = rem_vars(pvars);
+    pos = scheme_false;
+
+    val = letrec_check_expr(app->rator, frame, new_uvars, new_pvars, pos);
+    app->rator = val;
+    val = letrec_check_expr(app->rand,  frame, new_uvars, new_pvars, pos);
+    app->rand = val;
+
+    return o;
+}
+
+Scheme_Object *letrec_check_application3(Scheme_Object *o, Letrec_Check_Frame *frame, 
+                                         Scheme_Object *uvars, Scheme_Object *pvars, Scheme_Object *pos)
+{
+    Scheme_App3_Rec *app;
+    Scheme_Object *new_uvars, *new_pvars, *val;
+
+    app = (Scheme_App3_Rec *)o;
+
+    /* by entering the sub-expressions of an application, all
+       protectable variables are moved to the unprotected state. */
+    new_uvars = merge_vars(uvars, pvars);
+    new_pvars = rem_vars(pvars);
+    pos = scheme_false;
+
+    val = letrec_check_expr(app->rator, frame, new_uvars, new_pvars, pos);
+    app->rator = val;
+    val = letrec_check_expr(app->rand1, frame, new_uvars, new_pvars, pos);
+    app->rand1 = val;
+    val = letrec_check_expr(app->rand2, frame, new_uvars, new_pvars, pos);
+    app->rand2 = val;
+
+    return o;
+}
+
+Scheme_Object *letrec_check_sequence(Scheme_Object *o, Letrec_Check_Frame *frame, 
+                                     Scheme_Object *uvars, Scheme_Object *pvars, Scheme_Object *pos)
+{
+    Scheme_Sequence *seq;
+    Scheme_Object *val;
+    int i,n;
+
+    seq = (Scheme_Sequence *)o;
+
+    n = seq->count;
+    for (i = 0; i < n; i++) {
+        val = letrec_check_expr(seq->array[i], frame, uvars, pvars, pos);
+        seq->array[i] = val;
+    }
+
+    return o;
+}
+
+Scheme_Object *letrec_check_branch(Scheme_Object *o, Letrec_Check_Frame *frame, 
+                                   Scheme_Object *uvars, Scheme_Object *pvars, Scheme_Object *pos)
+{
+    Scheme_Branch_Rec *br;
+    Scheme_Object *val;
+
+    br = (Scheme_Branch_Rec *)o;
+
+    val = letrec_check_expr(br->test, frame, uvars, pvars, pos);
+    br->test = val;
+    val = letrec_check_expr(br->tbranch, frame, uvars, pvars, pos);
+    br->tbranch = val;
+    val = letrec_check_expr(br->fbranch, frame, uvars, pvars, pos);
+    br->fbranch = val;
+    
+    return o;
+}
+
+Scheme_Object *letrec_check_wcm(Scheme_Object *o, Letrec_Check_Frame *frame, 
+                                Scheme_Object *uvars, Scheme_Object *pvars, Scheme_Object *pos)
+{
+    Scheme_With_Continuation_Mark *wcm;
+    Scheme_Object *val;
+
+    wcm = (Scheme_With_Continuation_Mark *)o;
+    
+    val = letrec_check_expr(wcm->key, frame, uvars, pvars, pos);
+    wcm->key = val;
+    val = letrec_check_expr(wcm->val, frame, uvars, pvars, pos);
+    wcm->val = val;
+    val = letrec_check_expr(wcm->body, frame, uvars, pvars, pos);
+    wcm->body = val;
+    
+    return o;
+}
+
+Scheme_Object *letrec_check_closure_compilation(Scheme_Object *o, Letrec_Check_Frame *frame, 
+                                                Scheme_Object *uvars, Scheme_Object *pvars, Scheme_Object *pos)
+{
+    Scheme_Closure_Data *data;
+    Letrec_Check_Frame *new_frame;
+    Scheme_Object *new_pvars, *val;
+    int num_params;
+
+    data = (Scheme_Closure_Data *)o;
+
+    /* if we have not entered a letrec, pos will be false */
+    if (SCHEME_FALSEP(pos)) {
+        /* by entering an lambda, we move all protectable variables to
+           the protected state; i.e. we discard them since we do not
+           track protected variables.  TODO: In reality, pvars is
+           already null? */
+        new_pvars = rem_vars(pvars);
+        
+        num_params = data->num_params;
+        new_frame = init_letrec_check_frame(FRAME_TYPE_CLOSURE, num_params, frame, NULL);
+
+#ifdef MZTAG_REQUIRED
+        if ((frame != NULL) && (frame->type != scheme_rt_letrec_check_frame)) {
+            scheme_signal_error("letrec_check_closure_compilation: frame is not a frame");
+        }
+        if (new_frame->type != scheme_rt_letrec_check_frame) {
+            scheme_signal_error("letrec_check_closure_compilation: frame is not a frame");
+        }
+#endif
+
+        if (num_params < 0) {
+            scheme_signal_error("lambda has negative arguments what do");
+        }
+        
+        pvars = new_pvars;
+        val = letrec_check_expr(data->code, new_frame, uvars, pvars, pos);
+        data->code = val;
+        if (DEBUG_LEVEL > 1) {
+            printf("letrec_check_closure_compilation: ");
+            print_frame(new_frame);
+            printf(" <- ");
+            print_frame(frame);
+            printf("\n");
+        }
+
+    }
+    else {
+        /* we can defer this lambda because it is not inside an
+           application! hurray! */
+
+        Scheme_Deferred_Expr *clos;
+        Letrec_Check_Frame *outer_frame;
+    
+        /* create a deferred expression that closes over the frame it
+           appeared in, the variable to which it is being deferred,
+           and the current uvars and pvars */
+        int position = SCHEME_INT_VAL(pos);
+        clos = make_deferred_expr_closure(data, frame, position, uvars, pvars);
+
+        /* get the correct frame and stick it up there */
+        outer_frame = get_nearest_rhs(frame);
+        update_frame(outer_frame, frame, position, clos);
+
+    }
+
+    return o;
+}
+
+void letrec_check_deferred_expr(Scheme_Object *o, Letrec_Check_Frame *outer, int type)
+{
+    Scheme_Deferred_Expr *clos;
+    Scheme_Closure_Data *data;
+    Letrec_Check_Frame *inner, *new_frame;
+    Scheme_Object *tmp, *val, *uvars, *pvars, *tmp_uvars, *tmp_pvars, *deferred_uvars, *deferred_pvars, *after_i, *i_wrapped, *subexpr_ls;
+    int i, old_subexpr, num_params, length_diff, position;
+
+    /* gets the closed over data from clos, which will always be a
+       deferred expression that contains a closure */
+    clos = (Scheme_Deferred_Expr *)o;
+
+    SCHEME_ASSERT(SAME_TYPE(SCHEME_TYPE(clos), scheme_deferred_expr_type),
+                  "letrec_check_deferred_expr: clos is not a scheme_deferred_expr");
+
+    data = (Scheme_Closure_Data *)clos->expr;
+    position = clos->position;
+    inner = clos->frame;
+    uvars = clos->uvars;
+    pvars = clos->pvars;
+    subexpr_ls = clos->subexpr_ls;
+
+    subexpr_ls_to_frame(subexpr_ls, inner);
+    
+#ifdef MZTAG_REQUIRED
+        if (outer->type != scheme_rt_letrec_check_frame) {
+            scheme_signal_error("letrec_check_deferred_expr: frame is not a frame");
+        }
+#endif
+
+    if (scheme_proper_list_length(uvars) !=
+        scheme_proper_list_length(pvars)) {
+        scheme_signal_error("letrec_check_deferred_expr: vars different lengths");
+    }
+
+    DEBUG(printf(" preparing to process deferred expression for %d in subexpr %d\n", 
+                 position, outer->subexpr));
+
+    after_i = scheme_null;
+    for (i = position - 1; i >= 0; i--) {
+        i_wrapped = scheme_make_integer(i);
+        tmp = scheme_make_pair(i_wrapped, after_i);
+        after_i = tmp;
+    }
+
+    if (outer->frame_type == FRAME_TYPE_LETREC) {
+        if (SCHEME_NULLP(uvars)) {
+            scheme_signal_error("letrec_check_deferred_expr: uvars is null");
+        }
+
+        if (SCHEME_NULLP(pvars)) {
+            scheme_signal_error("letrec_check_deferred_expr: pvars is null");
+        }
+
+        if (type & LET_NO_EXPR) {
+            /* otherwise, it is not referenced anywhere in an unsafe context,
+               so we're pretty much good.  still have to check it for letrecs
+               in its sub-expressions */
+            DEBUG(printf(" building NO environment\n"));
+
+            deferred_uvars = scheme_make_pair(scheme_null, SCHEME_CDR(uvars));
+            tmp = rem_vars(SCHEME_CDR(pvars));
+            deferred_pvars = scheme_make_pair(scheme_null, tmp);
+        }
+        else if (type & LET_RHS_EXPR) { 
+            /* the worst thing that can happen is that a LHS variable is
+               referenced during the evaluation of a RHS binding (i.e. in
+               an unsafe context in a RHS) so we check those first.
+               
+               we treat 1 thru i as protected, because this reference must
+               occur in a binding after i (and therefore 1 thru i have
+               values).  the rest of the LHS variables and those LHS
+               variables from outer letrecs are considered unprotected.
+            */
+            DEBUG(printf(" building RHS environment\n"));
+
+            deferred_uvars = merge_vars(uvars, pvars);
+            tmp = scheme_make_pair(after_i, SCHEME_CDR(deferred_uvars));
+            deferred_uvars = tmp;
+            deferred_pvars = rem_vars(pvars);
+        }
+        
+        else if (type & LET_BODY_EXPR) {
+            /* the next worst thing that can happen is that a LHS variable
+               is referenced during the body, where a variable from an
+               outer letrec might appear.
+               
+               all LHS variables of the current letrec are protected, but
+               the LHS variables from outer letrecs are unprotected.
+            */
+            DEBUG(printf(" building BODY environment\n"));
+
+            tmp = scheme_make_pair(scheme_null, SCHEME_CDR(uvars));
+            deferred_uvars = tmp;
+            
+            tmp = scheme_make_pair(scheme_null, SCHEME_CDR(pvars));
+            deferred_pvars = tmp;
+            
+            tmp = merge_vars(deferred_uvars, deferred_pvars);
+            deferred_uvars = tmp;
+            deferred_pvars = rem_vars(deferred_pvars);
+        }
+
+        else {
+            scheme_signal_error("letrec_check_deferred_expr: invalid type");
+            return; // dead
+        }
+    }
+    else {
+        if (type & LET_NO_EXPR) {
+            deferred_uvars = uvars;
+            deferred_pvars = rem_vars(pvars);
+        }
+        else {
+            deferred_uvars = uvars;
+            deferred_pvars = pvars;
+        }
+    }
+        
+    /* we trust the enclosing let to know the statuses of variables up
+       until (and including) it's own LHS variables, and then we
+       switch over to the deferred expression's environment.  so, we
+       compute the length difference of the two lists and chop off
+       what we need to */
+    length_diff = scheme_list_length(uvars) - scheme_list_length(deferred_uvars);
+    
+    tmp_uvars = scheme_null;
+    tmp_pvars = scheme_null;
+    while (length_diff > 0) {
+        tmp = scheme_make_pair(SCHEME_CAR(uvars), tmp_uvars);
+        tmp_uvars = tmp;
+        tmp = scheme_make_pair(SCHEME_CAR(pvars), tmp_pvars);
+        tmp_pvars = tmp;
+        uvars = SCHEME_CDR(uvars);
+        pvars = SCHEME_CDR(pvars);
+        length_diff--;
+    }
+    tmp_uvars = scheme_reverse(tmp_uvars);
+    tmp_pvars = scheme_reverse(tmp_pvars);
+
+    uvars = scheme_append(tmp_uvars, deferred_uvars);
+    pvars = scheme_append(tmp_pvars, deferred_pvars);
+
+    DEBUG(printf(" calculated: uvars: "));
+    DEBUG(print_vars(uvars);)
+    DEBUG(printf(" pvars: "));
+    DEBUG(print_vars(pvars);)
+    DEBUG(printf("\n"));
+    
+    /* establish that we actually get a lambda back */
+    if (SCHEME_TYPE(data) != scheme_compiled_unclosed_procedure_type) {
+        printf("SCHEME_TYPE(data): %d\n", SCHEME_TYPE(data));
+        scheme_signal_error("deferred expression does not contain a lambda");
+    }
+
+    /* hopefully we know how to deal with this lambda */
+    num_params = data->num_params;
+    if (num_params < 0) {
+        scheme_signal_error("process_deferred_bindings: lambda has negative arguments");
+    }
+
+    if (outer->subexpr < 0) {
+        scheme_signal_error("letrec_check_deferred_expr: subexpr is negative");
+    }
+    if (inner->subexpr < 0) {
+        scheme_signal_error("letrec_check_deferred_expr: subexpr is negative");
+    }
+
+    old_subexpr = outer->subexpr;
+    outer->subexpr = LET_RHS_EXPR;
+
+    new_frame = init_letrec_check_frame(FRAME_TYPE_CLOSURE, num_params, inner, NULL);
+    if (type & LET_NO_EXPR) {
+        new_frame->subexpr |= LET_NO_EXPR;
+    }
+
+#ifdef MZTAG_REQUIRED
+        if (new_frame->type != scheme_rt_letrec_check_frame) {
+            scheme_signal_error("letrec_check_deferred_expr: frame is not a frame");
+        }
+        if (inner->type != scheme_rt_letrec_check_frame) {
+            scheme_signal_error("letrec_check_deferred_expr: frame is not a frame");
+        }
+#endif
+
+    val = letrec_check_expr(data->code, new_frame, uvars, pvars, scheme_false);
+    data->code = val;
+
+    outer->subexpr = old_subexpr;
+
+#ifdef MZTAG_REQUIRED
+    if (outer->type != scheme_rt_letrec_check_frame) {
+        scheme_signal_error("letrec_check_deferred_expr: frame is not a frame");
+    }
+    if (new_frame->type != scheme_rt_letrec_check_frame) {
+        scheme_signal_error("letrec_check_deferred_expr: frame is not a frame");
+    }
+#endif
+
+    /* decrement the waiting count between the current frame and the
+       outer frame */
+    DEBUG(printf(" expression processed, checking between %p and %p\n", outer, inner));
+    for (; outer != inner; inner = inner->next) {
+        DEBUG(printf(" %p decrementing waiting and resuming letrecs\n", inner));
+        if (inner == NULL) {
+            scheme_signal_error("letrec_check_deferred_expr: inner is null");
+        }
+        if (outer == NULL) {
+            scheme_signal_error("letrec_check_deferred_expr: outer is null");
+        }
+#ifdef MZTAG_REQUIRED
+        if (inner->type != scheme_rt_letrec_check_frame) {
+            scheme_signal_error("letrec_check_deferred_expr: frame is not a frame");
+        }
+        if (outer->type != scheme_rt_letrec_check_frame) {
+            scheme_signal_error("letrec_check_deferred_expr: frame is not a frame");
+        }
+#endif
+        (inner->waiting)--;
+        letrec_check_lets_resume(inner);
+    }
+
+    DEBUG(printf("done waking things up\n"));
+    return;
+}
+
+/* PLAN:
+ * 
+ * Indicate that we are traversing the RHSs of the let by changing the
+ * frame->subexpr field, and then process every binding RHS.
+ *
+ * Populate frame->deferred_with_rhs_ref with the DEFERRED bindings of
+ * every LHS variable mentioned in the RHSs according to frame->ref,
+ * and process every expression in frame->deferred_with_rhs_ref.
+ * 
+ * If there is a reference to a LHS variable binding while
+ * frame->deferred_with_rhs_ref is NOT FALSE, the deferred bindings
+ * for that LHS variable are also placed in
+ * frame->deferred_with_rhs_ref.  This step computes a closure.
+ * 
+ * Indicate that we are traversing the BODY of the let by changing the
+ * frame->subexpr field, and then process the body.
+ *
+ * Populate frame->deferred_with_body_ref with the DEFERRED bindings
+ * of every LHS variable mentioned in the body according to
+ * frame->ref, and process every expression in
+ * frame->deferred_with_body_ref.
+ * 
+ * If there is a reference to a LHS variable binding while
+ * frame->deferred_with_body_ref is NOT FALSE, the deferred bindings
+ * for that LHS variable are also placed in
+ * frame->deferred_with_body_ref.  This step computes a closure.
+ * 
+ * Go back and remove the SCHEME_WAS_ONLY_APPLIED and
+ * SCHEME_WAS_APPLIED_EXCEPT_ONCE flags from variables who had
+ * undefined checks added around them according to frame->checked.
+ */
+
+/* populates frame->deferred_with_(rhs/body)_ref with the deferred
+   binding of every LHS variable mentioned in the (RHSs/BODY)
+   according to frame->ref, and processes every expression inside */
+void process_deferred_bindings_rhs(Letrec_Check_Frame *frame) {
+    // ls = &(frame->deferred_with_rhs_ref);
+
+    // TODO: anything weird here?
+    Scheme_Object **def, *tmp;
+    int i, count, subexpr;
+
+    subexpr = frame->subexpr;
+    def = frame->def;
+    count = frame->count;
+
+    frame->deferred_with_rhs_ref = scheme_null;
+
+    def = frame->def;
+    for (i = 0; i < count; i++) {
+        if (!SCHEME_NULLP(def[i]) && pos_has_ref(i, frame, subexpr)) {
+            DEBUG(printf(" adding bindings for %d\n", i));
+            tmp = scheme_append(def[i], frame->deferred_with_rhs_ref);
+            frame->def[i] = scheme_null;
+            frame->deferred_with_rhs_ref = tmp;
+        }
+        else if (SCHEME_NULLP(def[i])) {
+            DEBUG(printf(" bindings for %d are null\n", i));
+        }
+        else if (!(pos_has_ref(i, frame, subexpr))) {
+            DEBUG(printf(" no ref to %d\n", i));
+        }
+    }
+    VERBOSE_DEBUG(printf(" %d expressions to be processed initially\n", 
+                         scheme_list_length(frame->deferred_with_rhs_ref)));
+    while (!SCHEME_NULLP(frame->deferred_with_rhs_ref)) {
+        DEBUG(printf(" checking one expr\n"));
+        if (!SCHEME_PAIRP(frame->deferred_with_rhs_ref)) {
+            scheme_signal_error("process_deferred_bindings_rhs: ls is not a ls");
+        }
+        tmp = SCHEME_CAR(frame->deferred_with_rhs_ref);
+        frame->deferred_with_rhs_ref = SCHEME_CDR(frame->deferred_with_rhs_ref);
+        VERBOSE_DEBUG(printf(" popping one expression (%d left to be processed)\n",
+                             scheme_list_length(frame->deferred_with_rhs_ref)));
+        letrec_check_deferred_expr(tmp, frame, subexpr);
+    }
+
+    DEBUG(printf(" putting ls to false\n"));
+
+#ifdef MZTAG_REQUIRED
+    if (frame->type != scheme_rt_letrec_check_frame) {
+        scheme_signal_error("process_deferred_bindings_rhs: frame is not a frame");
+    }
+#endif
+
+    /* put the accumulator back to false before leaving */
+    frame->deferred_with_rhs_ref = scheme_false;
+
+    DEBUG(printf(" done processing deferred bindings\n"));
+    
+    return;
+}
+
+void process_deferred_bindings_body(Letrec_Check_Frame *frame) {
+    // ls = &(frame->deferred_with_body_ref);
+
+    Scheme_Object **def, *tmp;
+    int i, count, subexpr;
+
+    subexpr = frame->subexpr;
+    def = frame->def;
+    count = frame->count;
+
+    frame->deferred_with_body_ref = scheme_null;
+
+    def = frame->def;
+    for (i = 0; i < count; i++) {
+        if (!SCHEME_NULLP(def[i]) && pos_has_ref(i, frame, subexpr)) {
+            DEBUG(printf(" adding bindings for %d\n", i));
+            tmp = scheme_append(def[i], frame->deferred_with_body_ref);
+            frame->def[i] = scheme_null;
+            frame->deferred_with_body_ref = tmp;
+        }
+        else if (SCHEME_NULLP(def[i])) {
+            DEBUG(printf(" bindings for %d are null\n", i));
+        }
+        else if (!(pos_has_ref(i, frame, subexpr))) {
+            DEBUG(printf(" no ref to %d\n", i));
+        }
+    }
+    VERBOSE_DEBUG(printf(" %d expressions to be processed initially\n", 
+                         scheme_list_length(frame->deferred_with_body_ref)));
+    while (!SCHEME_NULLP(frame->deferred_with_body_ref)) {
+        DEBUG(printf(" checking one expr\n"));
+        DEBUG(print_frame(frame));
+        DEBUG(printf("\n"));
+        if (!SCHEME_PAIRP(frame->deferred_with_body_ref)) {
+            scheme_signal_error("process_deferred_bindings_body: ls is not a ls");
+        }
+        tmp = SCHEME_CAR(frame->deferred_with_body_ref);
+        frame->deferred_with_body_ref = SCHEME_CDR(frame->deferred_with_body_ref);
+        VERBOSE_DEBUG(printf(" popping one expression (%d left to be processed)\n",
+                             scheme_list_length(frame->deferred_with_body_ref)));
+        letrec_check_deferred_expr(tmp, frame, subexpr);
+    }
+
+    DEBUG(printf(" putting ls to false\n"));
+
+#ifdef MZTAG_REQUIRED
+    if (frame->type != scheme_rt_letrec_check_frame) {
+        scheme_signal_error("process_deferred_bindings_body: frame is not a frame");
+    }
+#endif
+
+    /* put the accumulator back to false before leaving */
+    frame->deferred_with_body_ref = scheme_false;
+
+    DEBUG(printf(" done processing deferred bindings\n"));
+    
+    return;
+}
+
+void process_deferred_bindings_no(Letrec_Check_Frame *frame) {
+    // ls = &(frame->deferred_with_no_ref);
+
+    Scheme_Object **def, *tmp;
+    int i, count, subexpr;
+
+
+    subexpr = frame->subexpr;
+    def = frame->def;
+    count = frame->count;
+
+    frame->deferred_with_no_ref = scheme_null;
+    def = frame->def;
+    for (i = 0; i < count; i++) {
+        if (!SCHEME_NULLP(def[i]) && pos_has_ref(i, frame, subexpr)) {
+            DEBUG(printf(" adding bindings for %d\n", i));
+            tmp = scheme_append(def[i], frame->deferred_with_no_ref);
+            frame->def[i] = scheme_null;
+            frame->deferred_with_no_ref = tmp;
+        }
+        else if (SCHEME_NULLP(def[i])) {
+            DEBUG(printf(" bindings for %d are null\n", i));
+        }
+        else if (!(pos_has_ref(i, frame, subexpr))) {
+            DEBUG(printf(" no ref to %d\n", i));
+        }
+    }
+    VERBOSE_DEBUG(printf(" %d expressions to be processed initially\n", 
+                         scheme_list_length(frame->deferred_with_no_ref)));
+    while (!SCHEME_NULLP(frame->deferred_with_no_ref)) {
+        DEBUG(printf(" checking one expr\n"));
+        if (!SCHEME_PAIRP(frame->deferred_with_no_ref)) {
+            scheme_signal_error("process_deferred_bindings_no: ls is not a ls");
+        }
+        tmp = SCHEME_CAR(frame->deferred_with_no_ref);
+        frame->deferred_with_no_ref = SCHEME_CDR(frame->deferred_with_no_ref);
+        VERBOSE_DEBUG(printf(" popping one expression (%d left to be processed)\n",
+                             scheme_list_length(frame->deferred_with_no_ref)));
+        letrec_check_deferred_expr(tmp, frame, subexpr);
+    }
+
+    DEBUG(printf(" putting ls to false\n"));
+
+#ifdef MZTAG_REQUIRED
+    if (frame->type != scheme_rt_letrec_check_frame) {
+        scheme_signal_error("process_deferred_bindings_no: frame is not a frame");
+    }
+#endif
+
+    /* put the accumulator back to false before leaving */
+    frame->deferred_with_no_ref = scheme_false;
+
+    DEBUG(printf(" done processing deferred bindings\n"));
+    
+    return;
+}
+
+void process_deferred_bindings(Letrec_Check_Frame *frame) {
+    int subexpr;
+
+    DEBUG(printf("processing deferred bindings\n"));
+    if (DEBUG_LEVEL > 1) {
+        printf(" ");
+        print_frame(frame);
+        printf("\n");
+    }
+
+    subexpr = frame->subexpr;
+
+    VERBOSE_DEBUG(printf(" subexpr: %d\n", subexpr));
+    
+    if (subexpr & LET_NO_EXPR) {
+        VERBOSE_DEBUG(printf(" checking deferred bindings with NO reference\n"));
+        return process_deferred_bindings_no(frame);
+    }
+    else if (subexpr & LET_RHS_EXPR) {
+        VERBOSE_DEBUG(printf(" checking deferred bindings with RHS reference\n"));
+        return process_deferred_bindings_rhs(frame);
+    } 
+    else if (subexpr & LET_BODY_EXPR) {
+        VERBOSE_DEBUG(printf(" checking deferred bindings with BODY reference\n"));
+        return process_deferred_bindings_body(frame);
+    }
+    else {
+        scheme_signal_error("process_deferred_bindings: unknown subexpr");
+    }
+
+    return; // dead
+}
+
+Scheme_Object *letrec_check_lets(Scheme_Object *o, Letrec_Check_Frame *old_frame, 
+                                 Scheme_Object *uvars, Scheme_Object *pvars, Scheme_Object *pos)
+{
+    Letrec_Check_Frame *frame;
+    Scheme_Compiled_Let_Value *clv;
+    Scheme_Object *body, *new_uvars_level, *new_pvars_level, *i_wrapped, *tmp, *val;
+    int i, j, k;
+
+    /* gets the information out of our header about the number of
+       total clauses, the number of total bindings, and whether or not
+       this let is recursive */
+    Scheme_Let_Header *head = (Scheme_Let_Header *)o;
+
+    /* number of clauses in the let */
+    int num_clauses = head->num_clauses;
+
+    /* number of total bindings (not necessarily the same as the
+       number of bindings thanks to let(rec)-values) */
+    int count = head->count;
+
+    /* information about this let */
+    int header_flags = SCHEME_LET_FLAGS(head);
+
+    /* computes what kind of let this is: letrec, let*, or let */
+    int frame_type;
+
+    Scheme_Object *new_uvars, *new_pvars;
+
+    /* compute and record the type, either let let* or letrec */
+    if (header_flags & SCHEME_LET_RECURSIVE) { 
+        DEBUG(printf("LETREC_CHECK_LETREC\n"));
+        frame_type = FRAME_TYPE_LETREC; 
+    }
+    else if (header_flags & SCHEME_LET_STAR) { 
+        DEBUG(printf("LETREC_CHECK_LETSTAR\n"));
+        frame_type = FRAME_TYPE_LETSTAR; 
+    }
+    else { 
+        DEBUG(printf("LETREC_CHECK_LET\n"));
+        frame_type = FRAME_TYPE_LET; 
+    }
+
+    /* push the new bindings on to the frame (even in the case of let
+       this is ok because get_relative_frame knows how to look up
+       variables properly given the subexpr */
+    frame = init_letrec_check_frame(frame_type, count, old_frame, head);
+#ifdef MZTAG_REQUIRED
+    if (frame->type != scheme_rt_letrec_check_frame) {
+        scheme_signal_error("letrec_check_lets: frame is not a frame");
+    }
+    if ((old_frame != NULL) && (old_frame->type != scheme_rt_letrec_check_frame)) {
+        scheme_signal_error("letrec_check_lets: frame is not a frame");
+    }
+#endif
+
+    /* add a new level to our uvars and pvars if this is a letrec */
+    if (frame_type == FRAME_TYPE_LETREC) {
+        new_pvars_level = scheme_null;
+        new_uvars_level = scheme_null;
+        
+        for (i = 0; i < count; i++) {
+            i_wrapped = scheme_make_integer(i);
+            tmp = scheme_make_pair(i_wrapped, new_pvars_level);
+            new_pvars_level = tmp;
+        }
+
+        // new_pvars_level = (i i-1 ... 1 0)
+        // new_uvars_level = ()
+    }
+
+    body = head->body;
+
+    frame->subexpr = LET_RHS_EXPR;
+
+    /* loops through every right hand side */
+    k = head->count;
+    for (i = num_clauses; i--;) {
+        clv = (Scheme_Compiled_Let_Value *)body;
+
+        if (frame_type == FRAME_TYPE_LETREC) {
+            new_uvars = scheme_make_pair(new_uvars_level, uvars);
+            new_pvars = scheme_make_pair(new_pvars_level, pvars);
+        }
+        else {
+            new_uvars = uvars;
+            new_pvars = pvars;
+        }
+
+        k -= clv->count;
+
+        /* TODO: is there something more sane for the treatment of
+           bindings with no variables?  every lambda in the rhs will
+           be treated as if there is an unsafe application where in
+           fact it is just the opposite, no unsafe application can
+           possibly happen */
+        if (clv->count == 0) {
+            val = letrec_check_expr(clv->value, frame, new_uvars, new_pvars,
+                                    scheme_false);
+        }
+        else if (frame_type == FRAME_TYPE_LETREC) {
+            val = letrec_check_expr(clv->value, frame, new_uvars, new_pvars,
+                                    scheme_make_integer(k));
+        }
+        else {
+            val = letrec_check_expr(clv->value, frame, new_uvars, new_pvars,
+                                    pos);
+        }
+        
+        if (frame_type == FRAME_TYPE_LETREC) {
+            /* then remove the current LHS variable from the
+               protectables variables as it is now protected */
+            for (j = 0; j < clv->count; j++) {
+                if (SCHEME_NULLP(new_pvars_level)) {
+                    scheme_signal_error("letrec_check_lets: new_pvars_level is null");
+                }
+                new_pvars_level = SCHEME_CDR(new_pvars_level);
+            }
+        }
+        
+        if (frame_type == FRAME_TYPE_LETREC) {
+            clv->value = val;
+        }
+
+        body = clv->body;
+    }
+
+    if (frame_type != FRAME_TYPE_LET) {
+        process_deferred_bindings(frame);
+    }
+
+    /* body is already the right value thanks to the for */
+    frame->subexpr = LET_BODY_EXPR;
+    DEBUG(printf("processing let body\n"));
+    val = letrec_check_expr(body, frame, uvars, pvars, pos);
+
+    /* put the new body in the right place: after the last RHS if the
+       let had bindings, otherwise, the let header should point to the
+       new body */
+    if (num_clauses > 0) clv->body = val;
+    else head->body = val;
+
+#ifdef MZTAG_REQUIRED
+        if (frame->type != scheme_rt_letrec_check_frame) {
+            scheme_signal_error("letrec_check_lets: frame is not a frame");
+        }
+#endif
+
+    letrec_check_lets_resume(frame);
+
+    DEBUG(printf("letrec_check_lets: "));
+    DEBUG(print_frame(old_frame));
+    DEBUG(printf(" <- "));
+    DEBUG(print_frame(frame));
+    DEBUG(printf("\n"));
+
+    return o;
+}
+
+/* note to future self: the length of define_values is sometimes 1,
+   and you definitely don't want to look inside if that's the case */
+Scheme_Object *letrec_check_define_values(Scheme_Object *data, Letrec_Check_Frame *frame, 
+                                          Scheme_Object *uvars, Scheme_Object *pvars, Scheme_Object *pos)
+{
+    if (SCHEME_VEC_SIZE(data) <= 1) {
+        // TODO: right thing to do?
+        return data;
+    }
+    else {
+        Scheme_Object *vars = SCHEME_VEC_ELS(data)[0];
+        Scheme_Object *val = SCHEME_VEC_ELS(data)[1];
+        DEBUG(printf("letrec_check_define_values\n"));
+
+        DEBUG(printf(" size: %d\n position 0: ", (int)SCHEME_VEC_SIZE(data)));
+        DEBUG(fflush(stdout));
+        DEBUG(scheme_display(vars, scheme_orig_stdout_port));
+        DEBUG(scheme_flush_output(scheme_orig_stdout_port));
+        DEBUG(printf("\n position 1: ")); 
+        DEBUG(fflush(stdout));
+        DEBUG(scheme_display(val, scheme_orig_stdout_port));
+        DEBUG(scheme_flush_output(scheme_orig_stdout_port));
+        DEBUG(printf("\n"));
+
+        if(!SCHEME_PAIRP(vars) && !SCHEME_NULLP(vars)) {
+            printf("vars: %d, val: %d\n", SCHEME_TYPE(vars), SCHEME_TYPE(val));
+            scheme_signal_error("letrec_check_define_values: processing resolved code");
+        }
+
+        // TODO: don't think we need to process vars ever
+        // vars = letrec_check_expr(vars, frame, uvars, pvars, pos);
+        val = letrec_check_expr(val, frame, uvars, pvars, pos);
+
+        SCHEME_VEC_ELS(data)[1] = val;
+    }
+    
+    return data;
+}
+
+Scheme_Object *letrec_check_ref(Scheme_Object *data, Letrec_Check_Frame *frame, 
+                                Scheme_Object *uvars, Scheme_Object *pvars, Wrapped_Lhs *lhs)
+{
+    return data;
+}
+
+Scheme_Object *letrec_check_set(Scheme_Object *o, Letrec_Check_Frame *frame, 
+                                Scheme_Object *uvars, Scheme_Object *pvars, Scheme_Object *pos)
+{
+    Scheme_Set_Bang *sb;
+    Scheme_Object *val;
+
+    sb = (Scheme_Set_Bang *)o;
+    val = sb->val;
+
+    val = letrec_check_expr(val, frame, uvars, pvars, pos);
+    sb->val = val;
+
+    return o;
+}
+
+Scheme_Object *letrec_check_define_syntaxes(Scheme_Object *data, Letrec_Check_Frame *frame, 
+                                            Scheme_Object *uvars, Scheme_Object *pvars, Scheme_Object *pos)
+{
+    Scheme_Object *val;
+    val = SCHEME_VEC_ELS(data)[3];
+
+    val = letrec_check_expr(val, frame, uvars, pvars, pos);
+    SCHEME_VEC_ELS(data)[3] = val;
+
+    return data;
+}
+
+Scheme_Object *letrec_check_begin_for_syntax(Scheme_Object *data, Letrec_Check_Frame *frame, 
+                                             Scheme_Object *uvars, Scheme_Object *pvars, Scheme_Object *pos)
+{
+    Scheme_Object *l, *a, *val;
+    
+    l = SCHEME_VEC_ELS(data)[2];
+    
+    while (!SCHEME_NULLP(l)) {
+        a = SCHEME_CAR(l);
+        val = letrec_check_expr(a, frame, uvars, pvars, pos);
+        SCHEME_CAR(l) = val;
+        l = SCHEME_CDR(l);
+    }
+    
+    return data;
+}
+
+Scheme_Object *letrec_check_case_lambda(Scheme_Object *o, Letrec_Check_Frame *frame, 
+                                        Scheme_Object *uvars, Scheme_Object *pvars, Scheme_Object *pos)
+{
+    Scheme_Case_Lambda *cl;
+    Scheme_Object *val;
+    int i, n;
+
+    cl = (Scheme_Case_Lambda *)o;
+
+    n = cl->count;
+    for (i = 0; i < n; i++) {
+        val = letrec_check_expr(cl->array[i], frame, uvars, pvars, pos);
+        cl->array[i] = val;
+    }
+
+    return o;
+}
+
+Scheme_Object *letrec_check_begin0(Scheme_Object *o, Letrec_Check_Frame *frame, 
+                                   Scheme_Object *uvars, Scheme_Object *pvars, Scheme_Object *pos)
+{
+    int i, n;
+    Scheme_Sequence *seq;
+    Scheme_Object *val;
+    
+    seq = (Scheme_Sequence *)o;
+    
+    n = seq->count;
+    for (i = 0; i < n; i++) {
+        val = letrec_check_expr(seq->array[i], frame, uvars, pvars, pos);
+        seq->array[i] = val;
+    }
+
+    return o;
+}
+
+Scheme_Object *letrec_check_apply_values(Scheme_Object *data, Letrec_Check_Frame *frame, 
+                                         Scheme_Object *uvars, Scheme_Object *pvars, Scheme_Object *pos)
+{
+    Scheme_Object *f, *e;
+    
+    f = SCHEME_PTR1_VAL(data);
+    e = SCHEME_PTR2_VAL(data);
+    
+    f = letrec_check_expr(f, frame, uvars, pvars, pos);
+    e = letrec_check_expr(e, frame, uvars, pvars, pos);
+
+    SCHEME_PTR1_VAL(data) = f;
+    SCHEME_PTR2_VAL(data) = e;
+    
+    return data;
+}
+
+Scheme_Object *letrec_check_module(Scheme_Object *o, Letrec_Check_Frame *frame, 
+                                   Scheme_Object *uvars, Scheme_Object *pvars, Scheme_Object *pos)
+{
+    int i, cnt;
+    Scheme_Module *m;
+    Scheme_Object *val;
+    m = (Scheme_Module *)o;
+
+    if (!m->comp_prefix) {
+        /* already resolved */
+        return (Scheme_Object *)m;
+    }
+    
+    DEBUG(printf("letrec_check_module:\n "));
+    MODNAME_DEBUG(fflush(stdout));
+    MODNAME_DEBUG(scheme_display(m->modname, scheme_orig_stdout_port));
+    MODNAME_DEBUG(scheme_flush_output(scheme_orig_stdout_port));
+    MODNAME_DEBUG(printf("\n"));
+
+    cnt = SCHEME_VEC_SIZE(m->bodies[0]);
+    for(i = 0; i < cnt; i++) {
+        val = SCHEME_VEC_ELS(m->bodies[0])[i];
+        val = letrec_check_expr(val, frame, uvars, pvars, pos);
+        SCHEME_VEC_ELS(m->bodies[0])[i] = val;
+    }
+
+    {
+        /* check submodules */
+        int k;
+        Scheme_Object *p;
+        for (k = 0; k < 2; k++) {
+            p = (k ? m->post_submodules : m->pre_submodules);
+            if (p) {
+                while (!SCHEME_NULLP(p)) {
+                    letrec_check_expr(SCHEME_CAR(p), frame, uvars, pvars, pos);
+                    p = SCHEME_CDR(p);
+                }
+            }
+        }
+    }
+
+    return o;
+}
+
+Scheme_Object *letrec_check_expr(Scheme_Object *expr, Letrec_Check_Frame *frame, 
+                                 Scheme_Object *uvars, Scheme_Object *pvars, Scheme_Object *pos)
+{
+    int type;
+    type = SCHEME_TYPE(expr);
+
+    SCHEME_USE_FUEL(1);
+
+    VERBOSE_DEBUG(printf ("letrec_check_expr: type %d\n", type));
+
+    switch (type) {
+    case scheme_local_type:
+        return letrec_check_local(expr, frame, uvars, pvars, pos);
+    case scheme_application_type:
+        return letrec_check_application(expr, frame, uvars, pvars, pos);
+    case scheme_application2_type:
+        return letrec_check_application2(expr, frame, uvars, pvars, pos);
+    case scheme_application3_type:
+        return letrec_check_application3(expr, frame, uvars, pvars, pos);
+    case scheme_sequence_type:
+    case scheme_splice_sequence_type:
+        return letrec_check_sequence(expr, frame, uvars, pvars, pos);
+    case scheme_branch_type:
+        return letrec_check_branch(expr, frame, uvars, pvars, pos);
+    case scheme_with_cont_mark_type:
+        return letrec_check_wcm(expr, frame, uvars, pvars, pos);
+    case scheme_compiled_unclosed_procedure_type:
+        return letrec_check_closure_compilation(expr, frame, uvars, pvars, pos);
+    case scheme_compiled_let_void_type:
+        return letrec_check_lets(expr, frame, uvars, pvars, pos);
+    case scheme_compiled_toplevel_type: /* var ref to a top level */
+        return expr;
+    case scheme_compiled_quote_syntax_type:
+        return expr;
+    case scheme_variable_type:
+    case scheme_module_variable_type:
+        scheme_signal_error("got top-level in wrong place");
+        return 0;
+    case scheme_define_values_type:
+        return letrec_check_define_values(expr, frame, uvars, pvars, pos);
+    case scheme_varref_form_type:
+        return letrec_check_ref(expr, frame, uvars, pvars, pos);
+    case scheme_set_bang_type:
+        return letrec_check_set(expr, frame, uvars, pvars, pos);
+    case scheme_define_syntaxes_type:
+        return letrec_check_define_syntaxes(expr, frame, uvars, pvars, pos);
+    case scheme_begin_for_syntax_type:
+        return letrec_check_begin_for_syntax(expr, frame, uvars, pvars, pos);
+    case scheme_case_lambda_sequence_type:
+        return letrec_check_case_lambda(expr, frame, uvars, pvars, pos);
+    case scheme_begin0_sequence_type:
+        return letrec_check_begin0(expr, frame, uvars, pvars, pos);
+    case scheme_apply_values_type:
+        return letrec_check_apply_values(expr, frame, uvars, pvars, pos);
+    case scheme_require_form_type:
+        return expr;
+    case scheme_module_type:
+        return letrec_check_module(expr, frame, uvars, pvars, pos);
+    default:
+        return expr;
+    }
+}
+
+Scheme_Object *scheme_letrec_check_expr(Scheme_Object *expr)
+{
+    Scheme_Object *val;
+    Scheme_Object *init_uvars = scheme_null;
+    Scheme_Object *init_pvars = scheme_null;
+    Scheme_Object *init_pos = scheme_false;
+
+    DEBUG(printf("Entry\n"));
+    val = letrec_check_expr(expr, NULL, init_uvars, init_pvars, init_pos);
+    DEBUG(printf("Exit\n"));
+
+    DEBUG(fflush(stdout));
+    return val;
+}
+
+/*========================================================================*/
+/*                         precise GC traversers                          */
+/*========================================================================*/
+
+#ifdef MZ_PRECISE_GC
+
+START_XFORM_SKIP;
+
+#include "mzmark_letrec_check.inc"
+
+static void register_traversers(void)
+{
+  GC_REG_TRAV(scheme_rt_letrec_check_frame, mark_letrec_check_frame);
+  GC_REG_TRAV(scheme_deferred_expr_type, mark_scheme_deferred_expr);
+}
+
+END_XFORM_SKIP;
+
+#endif
diff --git a/racket/src/racket/src/mkmark.rkt b/racket/src/racket/src/mkmark.rkt
index f03d3b72ec..84b9164ab1 100644
--- a/racket/src/racket/src/mkmark.rkt
+++ b/racket/src/racket/src/mkmark.rkt
@@ -1,7 +1,7 @@
 #lang racket/base
 
-(define re:start "^START ([a-z]+);")
-(define re:end "^END ([a-z]+);")
+(define re:start "^START ([a-z_]+);")
+(define re:end "^END ([a-z_]+);")
 
 (define re:form "^([a-zA-Z0-9_]+) [{]")
 
@@ -39,7 +39,7 @@
                            (loop (cdr l) (not skip?))]
                           [skip?
                            (loop (cdr l) #t)]
-                          [(regexp-match? #rx"(START|END)_[A-Z]+_ONLY;" (car l))
+                          [(regexp-match? #rx"(START|END)_[A-Z_]+_ONLY;" (car l))
                            (loop (cdr l) skip?)]
                           [else
                            (printf "~a\n" (car l))
diff --git a/racket/src/racket/src/module.c b/racket/src/racket/src/module.c
index 4bdbd8e5d4..6174243db1 100644
--- a/racket/src/racket/src/module.c
+++ b/racket/src/racket/src/module.c
@@ -8404,11 +8404,13 @@ static Scheme_Object *do_module_begin(Scheme_Object *orig_form, Scheme_Comp_Env
       /* Note: don't use MZCONFIG_USE_JIT for module bodies */
       use_jit = scheme_startup_use_jit;
 
+      o = scheme_letrec_check_expr((Scheme_Object *)env->genv->module);
+
       oi = scheme_optimize_info_create(env->prefix, 1);
       scheme_optimize_info_enforce_const(oi, rec[drec].comp_flags & COMP_ENFORCE_CONSTS);
       if (!(rec[drec].comp_flags & COMP_CAN_INLINE))
         scheme_optimize_info_never_inline(oi);
-      o = scheme_optimize_expr((Scheme_Object *)env->genv->module, oi, 0);
+      o = scheme_optimize_expr(o, oi, 0);
 
       rp = scheme_resolve_prefix(0, env->prefix, 1);
       ri = scheme_resolve_info_create(rp);
@@ -9014,6 +9016,8 @@ static Scheme_Object *do_module_begin_at_phase(Scheme_Object *form, Scheme_Comp_
           if (!for_stx)
             lifted_reqs = scheme_append(scheme_frame_get_require_lifts(eenv), lifted_reqs);
 
+          m = scheme_letrec_check_expr(m);
+
 	  oi = scheme_optimize_info_create(eenv->prefix, 1);
           scheme_optimize_info_set_context(oi, (Scheme_Object *)env->genv->module);
           if (!(rec[drec].comp_flags & COMP_CAN_INLINE))
diff --git a/racket/src/racket/src/mzmark_letrec_check.inc b/racket/src/racket/src/mzmark_letrec_check.inc
new file mode 100644
index 0000000000..420b985973
--- /dev/null
+++ b/racket/src/racket/src/mzmark_letrec_check.inc
@@ -0,0 +1,78 @@
+/* >>>> Generated by mkmark.rkt from mzmarksrc.c <<<< */
+
+static int mark_letrec_check_frame_SIZE(void *p, struct NewGC *gc) {
+  return
+  gcBYTES_TO_WORDS(sizeof(Letrec_Check_Frame));
+}
+
+static int mark_letrec_check_frame_MARK(void *p, struct NewGC *gc) {
+  Letrec_Check_Frame *frame = (Letrec_Check_Frame *)p;
+  
+  gcMARK2(frame->def, gc);
+  gcMARK2(frame->next, gc);
+  gcMARK2(frame->ref, gc);
+  gcMARK2(frame->checked, gc);
+  gcMARK2(frame->head, gc);
+  gcMARK2(frame->deferred_with_rhs_ref, gc);
+  gcMARK2(frame->deferred_with_body_ref, gc);
+  gcMARK2(frame->deferred_with_no_ref, gc);
+
+  return
+  gcBYTES_TO_WORDS(sizeof(Letrec_Check_Frame));
+}
+
+static int mark_letrec_check_frame_FIXUP(void *p, struct NewGC *gc) {
+  Letrec_Check_Frame *frame = (Letrec_Check_Frame *)p;
+  
+  gcFIXUP2(frame->def, gc);
+  gcFIXUP2(frame->next, gc);
+  gcFIXUP2(frame->ref, gc);
+  gcFIXUP2(frame->checked, gc);
+  gcFIXUP2(frame->head, gc);
+  gcFIXUP2(frame->deferred_with_rhs_ref, gc);
+  gcFIXUP2(frame->deferred_with_body_ref, gc);
+  gcFIXUP2(frame->deferred_with_no_ref, gc);
+
+  return
+  gcBYTES_TO_WORDS(sizeof(Letrec_Check_Frame));
+}
+
+#define mark_letrec_check_frame_IS_ATOMIC 0
+#define mark_letrec_check_frame_IS_CONST_SIZE 1
+
+
+static int mark_scheme_deferred_expr_SIZE(void *p, struct NewGC *gc) {
+  return
+  gcBYTES_TO_WORDS(sizeof(Scheme_Deferred_Expr));
+}
+
+static int mark_scheme_deferred_expr_MARK(void *p, struct NewGC *gc) {
+  Scheme_Deferred_Expr *clos = (Scheme_Deferred_Expr *)p;
+  
+  gcMARK2(clos->expr, gc);
+  gcMARK2(clos->frame, gc);
+  gcMARK2(clos->uvars, gc);
+  gcMARK2(clos->pvars, gc);
+  gcMARK2(clos->subexpr_ls, gc);
+
+  return
+  gcBYTES_TO_WORDS(sizeof(Scheme_Deferred_Expr));
+}
+
+static int mark_scheme_deferred_expr_FIXUP(void *p, struct NewGC *gc) {
+  Scheme_Deferred_Expr *clos = (Scheme_Deferred_Expr *)p;
+  
+  gcFIXUP2(clos->expr, gc);
+  gcFIXUP2(clos->frame, gc);
+  gcFIXUP2(clos->uvars, gc);
+  gcFIXUP2(clos->pvars, gc);
+  gcFIXUP2(clos->subexpr_ls, gc);
+
+  return
+  gcBYTES_TO_WORDS(sizeof(Scheme_Deferred_Expr));
+}
+
+#define mark_scheme_deferred_expr_IS_ATOMIC 0
+#define mark_scheme_deferred_expr_IS_CONST_SIZE 1
+
+
diff --git a/racket/src/racket/src/mzmark_type.inc b/racket/src/racket/src/mzmark_type.inc
index 60780093d5..5fc327c3df 100644
--- a/racket/src/racket/src/mzmark_type.inc
+++ b/racket/src/racket/src/mzmark_type.inc
@@ -628,6 +628,7 @@ static int comp_let_value_MARK(void *p, struct NewGC *gc) {
   gcMARK2(c->flags, gc);
   gcMARK2(c->value, gc);
   gcMARK2(c->body, gc);
+  gcMARK2(c->names, gc);
 
   return
   gcBYTES_TO_WORDS(sizeof(Scheme_Compiled_Let_Value));
@@ -639,6 +640,7 @@ static int comp_let_value_FIXUP(void *p, struct NewGC *gc) {
   gcFIXUP2(c->flags, gc);
   gcFIXUP2(c->value, gc);
   gcFIXUP2(c->body, gc);
+  gcFIXUP2(c->names, gc);
 
   return
   gcBYTES_TO_WORDS(sizeof(Scheme_Compiled_Let_Value));
@@ -1660,6 +1662,9 @@ static int input_port_MARK(void *p, struct NewGC *gc) {
   gcMARK2(ip->input_extras_ready, gc);
   gcMARK2(ip->unless, gc);
   gcMARK2(ip->unless_cache, gc);
+#ifdef WINDOWS_FILE_HANDLES
+  gcMARK2(ip->bufwidths, gc);
+#endif
 
   return
   gcBYTES_TO_WORDS(sizeof(Scheme_Input_Port));
@@ -1687,6 +1692,9 @@ static int input_port_FIXUP(void *p, struct NewGC *gc) {
   gcFIXUP2(ip->input_extras_ready, gc);
   gcFIXUP2(ip->unless, gc);
   gcFIXUP2(ip->unless_cache, gc);
+#ifdef WINDOWS_FILE_HANDLES
+  gcFIXUP2(ip->bufwidths, gc);
+#endif
 
   return
   gcBYTES_TO_WORDS(sizeof(Scheme_Input_Port));
diff --git a/racket/src/racket/src/mzmarksrc.c b/racket/src/racket/src/mzmarksrc.c
index e5ffe59825..7d926e241f 100644
--- a/racket/src/racket/src/mzmarksrc.c
+++ b/racket/src/racket/src/mzmarksrc.c
@@ -235,6 +235,7 @@ comp_let_value {
   gcMARK2(c->flags, gc);
   gcMARK2(c->value, gc);
   gcMARK2(c->body, gc);
+  gcMARK2(c->names, gc);
 
  size:
   gcBYTES_TO_WORDS(sizeof(Scheme_Compiled_Let_Value));
@@ -1327,6 +1328,43 @@ END sfs;
 
 /**********************************************************************/
 
+START letrec_check;
+
+mark_letrec_check_frame {
+ mark:
+  Letrec_Check_Frame *frame = (Letrec_Check_Frame *)p;
+  
+  gcMARK2(frame->def, gc);
+  gcMARK2(frame->next, gc);
+  gcMARK2(frame->ref, gc);
+  gcMARK2(frame->checked, gc);
+  gcMARK2(frame->head, gc);
+  gcMARK2(frame->deferred_with_rhs_ref, gc);
+  gcMARK2(frame->deferred_with_body_ref, gc);
+  gcMARK2(frame->deferred_with_no_ref, gc);
+
+ size:
+  gcBYTES_TO_WORDS(sizeof(Letrec_Check_Frame));
+}
+
+mark_scheme_deferred_expr {
+ mark:
+  Scheme_Deferred_Expr *clos = (Scheme_Deferred_Expr *)p;
+  
+  gcMARK2(clos->expr, gc);
+  gcMARK2(clos->frame, gc);
+  gcMARK2(clos->uvars, gc);
+  gcMARK2(clos->pvars, gc);
+  gcMARK2(clos->subexpr_ls, gc);
+
+ size:
+  gcBYTES_TO_WORDS(sizeof(Scheme_Deferred_Expr));
+}
+
+END letrec_check;
+
+/**********************************************************************/
+
 START optimize;
 
 mark_optimize_info {
diff --git a/racket/src/racket/src/optimize.c b/racket/src/racket/src/optimize.c
index 77211df3ec..c42b64cf94 100644
--- a/racket/src/racket/src/optimize.c
+++ b/racket/src/racket/src/optimize.c
@@ -250,7 +250,7 @@ int scheme_omittable_expr(Scheme_Object *o, int vals, int fuel, int resolved,
         If warn_info is supplied, complain when a mismatch is detected.
         If no_id is 1, then an identifier doesn't count as omittable,
         unless the identifier is a consistent top-level; currently, this
-        is used to imply the absece of a continuation-mark impersonator. */
+        is used to imply the absence of a continuation-mark impersonator. */
 {
   Scheme_Type vtype;
 
@@ -439,6 +439,15 @@ int scheme_omittable_expr(Scheme_Object *o, int vals, int fuel, int resolved,
     return 0;
   }
 
+  /* check for (set! x x) */
+  if (vtype == scheme_set_bang_type) {
+    Scheme_Set_Bang *sb = (Scheme_Set_Bang *)o;
+    if (SAME_TYPE(scheme_local_type, SCHEME_TYPE(sb->var))
+        && SAME_TYPE(scheme_local_type, SCHEME_TYPE(sb->val))
+        && (SCHEME_LOCAL_POS(sb->var) == SCHEME_LOCAL_POS(sb->val)))
+      return 1;
+  }
+
   /* check for struct-type declaration: */
   {
     Scheme_Object *auto_e;
@@ -2568,6 +2577,16 @@ static Scheme_Object *optimize_application3(Scheme_Object *o, Optimize_Info *inf
 
   app = (Scheme_App3_Rec *)o;
 
+  if (SAME_OBJ(app->rator, scheme_check_not_undefined)
+      && SCHEME_SYMBOLP(app->rand2)) {
+    scheme_log(info->logger,
+               SCHEME_LOG_WARNING,
+               0,
+               "warning%s: use-before-definition check inserted on variable: %S",
+               scheme_optimize_context_to_string(info->context),
+               app->rand2);
+  }
+
   /* Check for (apply ... (list ...)) early: */
   le = direct_apply((Scheme_Object *)app, app->rator, app->rand2, info);
   if (le) return scheme_optimize_expr(le, info, context);
diff --git a/racket/src/racket/src/print.c b/racket/src/racket/src/print.c
index e60dccbff8..1929acddde 100644
--- a/racket/src/racket/src/print.c
+++ b/racket/src/racket/src/print.c
@@ -2028,6 +2028,7 @@ print(Scheme_Object *obj, int notdisplay, int compact, Scheme_Hash_Table *ht,
   if (compact && (SCHEME_PROCP(obj) 
 		  || SCHEME_STRUCT_TYPEP(obj) 
 		  || SCHEME_EOFP(obj)
+                  || SAME_OBJ(scheme_undefined, obj)
 		  || SAME_TYPE(scheme_always_evt_type, SCHEME_TYPE(obj))
 		  || SAME_TYPE(scheme_never_evt_type, SCHEME_TYPE(obj))
 		  || SAME_TYPE(scheme_struct_property_type, SCHEME_TYPE(obj))
diff --git a/racket/src/racket/src/schminc.h b/racket/src/racket/src/schminc.h
index 033df58612..2dd81674fa 100644
--- a/racket/src/racket/src/schminc.h
+++ b/racket/src/racket/src/schminc.h
@@ -14,7 +14,7 @@
 
 #define USE_COMPILED_STARTUP 1
 
-#define EXPECTED_PRIM_COUNT 1116
+#define EXPECTED_PRIM_COUNT 1118
 #define EXPECTED_UNSAFE_COUNT 101
 #define EXPECTED_FLFXNUM_COUNT 69
 #define EXPECTED_EXTFL_COUNT 45
diff --git a/racket/src/racket/src/schpriv.h b/racket/src/racket/src/schpriv.h
index a27b210c6e..34c275fc7b 100644
--- a/racket/src/racket/src/schpriv.h
+++ b/racket/src/racket/src/schpriv.h
@@ -18,6 +18,8 @@
 #ifndef __mzscheme_private__
 #define __mzscheme_private__
 
+// #define MZ_GC_STRESS_TESTING 1
+
 #include "scheme.h"
 #include "longdouble/longdouble.h"
 
@@ -263,6 +265,7 @@ void scheme_init_type();
 void scheme_init_custodian_extractors();
 void scheme_init_bignum();
 void scheme_init_compenv();
+void scheme_init_letrec_check();
 void scheme_init_optimize();
 void scheme_init_resolve();
 void scheme_init_sfs();
@@ -432,6 +435,7 @@ extern Scheme_Object *scheme_values_func;
 extern Scheme_Object *scheme_procedure_p_proc;
 extern Scheme_Object *scheme_procedure_arity_includes_proc;
 extern Scheme_Object *scheme_void_proc;
+extern Scheme_Object *scheme_check_not_undefined;
 extern Scheme_Object *scheme_pair_p_proc;
 extern Scheme_Object *scheme_mpair_p_proc;
 extern Scheme_Object *scheme_unsafe_cons_list_proc;
@@ -1346,6 +1350,7 @@ typedef struct Scheme_Compiled_Let_Value {
   int *flags;
   Scheme_Object *value;
   Scheme_Object *body;
+  Scheme_Object **names; /* NULL after letrec_check phase */
 } Scheme_Compiled_Let_Value;
 
 #define SCHEME_CLV_FLAGS(clv) MZ_OPT_HASH_KEY(&(clv)->iso)
@@ -2856,6 +2861,8 @@ typedef struct Scheme_Set_Bang {
 
 Scheme_Object *scheme_protect_quote(Scheme_Object *expr);
 
+Scheme_Object *scheme_letrec_check_expr(Scheme_Object *);
+
 Scheme_Object *scheme_optimize_expr(Scheme_Object *, Optimize_Info *, int context);
 Scheme_Object *scheme_optimize_lets(Scheme_Object *form, Optimize_Info *info, int for_inline, int context);
 
diff --git a/racket/src/racket/src/schvers.h b/racket/src/racket/src/schvers.h
index 81ba3f0984..97ddbb1253 100644
--- a/racket/src/racket/src/schvers.h
+++ b/racket/src/racket/src/schvers.h
@@ -13,12 +13,12 @@
    consistently.)
 */
 
-#define MZSCHEME_VERSION "6.0.1.1"
+#define MZSCHEME_VERSION "6.0.1.2"
 
 #define MZSCHEME_VERSION_X 6
 #define MZSCHEME_VERSION_Y 0
 #define MZSCHEME_VERSION_Z 1
-#define MZSCHEME_VERSION_W 1
+#define MZSCHEME_VERSION_W 2
 
 #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/stypes.h b/racket/src/racket/src/stypes.h
index 546a21c479..58e76174dc 100644
--- a/racket/src/racket/src/stypes.h
+++ b/racket/src/racket/src/stypes.h
@@ -288,7 +288,9 @@ enum {
   scheme_rt_lightweight_cont,           /* 260 */
   scheme_rt_export_info,                /* 261 */
   scheme_rt_cont_jmp,                   /* 262 */
+  scheme_rt_letrec_check_frame,         /* 263 */
 #endif
+  scheme_deferred_expr_type,            /* 264 */
 
   _scheme_last_type_
 };