diff --git a/.travis.yml b/.travis.yml
index e65885f..563e7c1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -28,7 +28,8 @@ env:
     #- RACKET_VERSION=6.4
     #- RACKET_VERSION=6.5
     #- RACKET_VERSION=6.6
-    #- RACKET_VERSION=6.7
+    - RACKET_VERSION=6.8
+    - RACKET_VERSION=6.9
     - RACKET_VERSION=HEAD
 
 matrix:
diff --git a/TODO.txt b/TODO.txt
new file mode 100644
index 0000000..154cba7
--- /dev/null
+++ b/TODO.txt
@@ -0,0 +1,57 @@
+:::::::::Current task:
+
+with*: optimize by naming clusters of "missing", and naming types for known flex structs
+
+with*: call from phc-adt, wrappers to and from the actual structs
+
+:::::::::In progress:
+
+Draft the graph implementation
+
+Modularity
+
+:::::::::Ready:
+
+Run-time checkers for invariants
+
+Cleanup invariants-phantom.hl.rkt
+
+Implement graph
+
+Implement the first graph generation pass, with a placeholder wrapping each mapping result
+
+Implement the second graph generation pass: inline nodes
+
+Implement the third graph generation pass: replacing indices with promises
+
+Combine the graph passes into a single macro
+
+Relicensing
+
+Write "middle-dot" language extension
+
+Drop MathJax, directly print Unicode or render via LaTeX (speed & licensing issues)
+
+::::::::Later:
+
+Garbage collect graph
+
+Merge tagged-anytag-match into the regular match for tagged structures
+
+Check for non-intersection of the union types in traversal.hl.rkt, using the non-intersection implementation from phc-adt.
+
+to infer the type for curry, check using identifier-binding if the id is imported, if so try to print its type using eval
+
+:::::::::Backlog:
+
+Translate https://github.com/nanopass/nanopass-framework-scheme
+
+Translate https://github.com/akeep/scheme-to-c
+
+Formalise what well-typed means for typed-nanopass+graph means
+
+Formalise the semantics of typed-nanopass+graph programs (using redex?)
+
+Write memoir
+
+Proof that well-typed programs with the extensions translate to well-typed programs in plain TR, with the same semantics
\ No newline at end of file
diff --git a/flexible-with-generalized-ctor.hl.rkt b/flexible-with-generalized-ctor.hl.rkt
new file mode 100644
index 0000000..6563933
--- /dev/null
+++ b/flexible-with-generalized-ctor.hl.rkt
@@ -0,0 +1,69 @@
+#lang type-expander/lang
+#|hyper-literate #:♦ #:no-auto-require (dotlambda/unhygienic
+                                            . type-expander/lang)
+
+♦chunk[<*>|#
+       
+(provide builder-τ)
+
+(require racket/require
+         (for-syntax (subtract-in racket/base subtemplate/override)
+                     racket/list
+                     racket/function
+                     subtemplate/override))
+
+(struct (T) Some ([f : T]))
+(struct (T) None ([f : T]))
+
+(define-type-expander BinaryTree
+  (syntax-parser
+    [(_ leafⱼ …)
+     ;; TODO: implement BinaryTree.
+     #'(List leafⱼ …)]))
+
+(define-type-expander builder-τ
+  (syntax-parser
+    [(_ n m)
+     #:with (Nᵢ …) (range n)
+     #:with (Mⱼ …) (range m)
+     #:with ((Kᵢⱼ …) …) (map (const (Kⱼ …)) (Nᵢ …))
+     #:with ((Xᵢⱼ …) …) (map (const (Xⱼ …)) (Nᵢ …))
+     #:with ((Nᵢⱼ …) …) (map (λ (ni) (map (const ni) (Xⱼ …))) (Nᵢ …))
+     (define Ns (Nᵢ …))
+     (define Ms (Mⱼ …))
+     ;(define/with-syntax exceptⱼ (remove Mⱼ Ns)) …
+     ;     (define/with-syntax ((exceptᵢⱼ …) …)
+     ;       (map (const (exceptⱼ …)) (Nᵢ …)))
+     (define/with-syntax (exceptᵢ …) ((remove Nᵢ Ns) …))
+     (define/with-syntax ((exceptᵢⱼ …) …)
+       ((map (const (remove Nᵢ Ns)) Ms) …))
+     
+     #'(∀ ((?@ Kⱼ Xⱼ) …)
+          (→ (?@ Kⱼ Xⱼ) …
+             (BinaryTree
+              (U (Pairof Nᵢ
+                         ;; If Kⱼ is Nᵢ, then {∩ Kᵢⱼ {U . exceptᵢⱼ}} will
+                         ;; Nothing. We multiply the Nothing together by
+                         ;; building a List out of them (a single occurrence
+                         ;; of Nothing should collapse the list), so that the
+                         ;; result should be Nothing only if there is no Kⱼ
+                         ;; equal to Nᵢ. To force TR to propagate Nothing as
+                         ;; much as possible, we intersect it with
+                         ;; (None Any), which should be a no-op, but makes
+                         ;; sure the simplifier which runs with ∩ kicks in.
+                         ;; Therefore, the (None whatever) should appear only
+                         ;; if there is indeed no key provided for that leaf.
+                         (∩ (None (List {∩ Kᵢⱼ {U . exceptᵢⱼ}} …))
+                            (None Any)))
+                 (∩ (Pairof Kᵢⱼ (Some Xᵢⱼ))
+                    (Pairof Nᵢⱼ Any))
+                 …)
+              …)))]))
+
+; ../../../.racket/snapshot/pkgs/typed-racket-lib/typed-racket/types/overlap.rkt:40:0: mask-accessor: contract violation
+;  expected: mask?
+;  given: #f
+(define-type τ-4-2 (builder-τ 4 2))
+
+;]
+
diff --git a/flexible-with2.hl.rkt b/flexible-with2.hl.rkt
new file mode 100644
index 0000000..3976f31
--- /dev/null
+++ b/flexible-with2.hl.rkt
@@ -0,0 +1,392 @@
+#lang hyper-literate #:♦ (dotlambda/unhygienic . type-expander/lang)
+
+♦title[#:style manual-doc-style ;#:style (with-html5 manual-doc-style)
+       #:tag "flexible-with"
+       #:tag-prefix "phc-graph/flexible-with"]{Flexible functional
+ modification and extension of records}
+
+♦(chunks-toc-prefix
+  '("(lib phc-graph/scribblings/phc-graph-implementation.scrbl)"
+    "phc-graph/flexible-with"))
+
+♦section{Goals}
+
+Our goal here is to have strongly typed records, with row polymorphism (a
+♦racket[Rest] row type variable can range over multiple possibly-present
+fields), and structural type equivalence (two record types are identical if
+they have the same fields, and these fields have the same types).
+
+♦section{Overview}
+
+We represent flexible records using a tree, where the leaves are field values.
+Every field which occurs anywhere in the program is assigned a constant index.
+This index determines which leaf is used to store that field's values. In
+order to avoid storing a huge tree for every tree-record, the actual fields
+are captured by a closure, and the tree is lazily generated (node by node)
+upon access.
+
+The type for a flexible record can support row polymorphism: the type of
+fields which may optionally be present are represented by a polymorphic type
+variable. Note that this means that no only one row type variable is used, but
+several. We define below facilities to automatically generate this list of
+polymorphic type variables. In order to avoid having a huge number of type
+variables, a branch containing only optional fields can be collapsed into a
+single type variable. An exception to this rule is when a field needs to be
+added by the user code in the middle of a branch: in this case the branch may
+not be collapsed.
+
+♦section{Type of a tree-record, with a hole}
+
+♦CHUNK[<tree-type-with-replacement>
+       (define-for-syntax (tree-type-with-replacement n last τ*)
+         (define-values (next mod) (quotient/remainder n 2))
+         (cond [(null? τ*) last]
+               [(= mod 0)
+                (tree-type-with-replacement next
+                                            #`(Pairof #,last #,(car τ*))
+                                            (cdr τ*))]
+               [else
+                (tree-type-with-replacement next
+                                            #`(Pairof #,(car τ*) #,last)
+                                            (cdr τ*))]))]
+
+♦section{Functionally updating a tree-record}
+
+♦subsection{Adding and modifying fields}
+
+Since we only deal with functional updates of immutable records, modifying a
+field does little more than discarding the old value, and injecting the new
+value instead into the new, updated record.
+
+Adding a new field is done using the same exact operation: missing fields are
+denoted by a special value, ♦racket['NONE], while present fields are
+represented as instances of the polymorphic struct ♦racket[(Some T)]. Adding a
+new field is therefore as simple as discarding the old ♦racket['NONE] marker,
+and replacing it with the new value, wrapped with ♦racket[Some]. A field
+update would instead discard the old instance of ♦racket[Some], and replace it
+with a new one.
+
+♦CHUNK[<make-replace-in-tree-body>
+       (if (= i 1)
+           #'(delay/pure/stateless replacement)
+           (let* ([bits (to-bits i)]
+                  [next (from-bits (cons #t (cddr bits)))]
+                  [mod (cadr bits)])
+             (define/with-syntax next-id (vector-ref low-names (sub1 next)))
+             (if mod
+                 #`(replace-right (inst next-id #,@τ*-limited+T-next)
+                                  tree-thunk
+                                  replacement)
+                 #`(replace-left (inst next-id #,@τ*-limited+T-next)
+                                 tree-thunk
+                                 replacement))))]
+
+♦CHUNK[<define-replace-in-tree>
+       (: replace-right (∀ (A B C R) (→ (→ (Promise B) R (Promise C))
+                                        (Promise (Pairof A B))
+                                        R
+                                        (Promise (Pairof A C)))))
+       (define-pure/stateless
+         #:∀ (A B C R)
+         (replace-right [next-id : (→ (Promise B) R (Promise C))]
+                        [tree-thunk : (Promise (Pairof A B))]
+                        [replacement : R])
+         (delay/pure/stateless
+          (let ([tree (force tree-thunk)])
+            (let ([left-subtree (car tree)]
+                  [right-subtree (cdr tree)])
+              (cons left-subtree
+                    (force (next-id (delay/pure/stateless right-subtree)
+                                    replacement)))))))
+       (: replace-left (∀ (A B C R) (→ (→ (Promise A) R (Promise C))
+                                       (Promise (Pairof A B))
+                                       R
+                                       (Promise (Pairof C B)))))
+       (define-pure/stateless
+         #:∀ (A B C R)
+         (replace-left [next-id : (→ (Promise A) R (Promise C))]
+                       [tree-thunk : (Promise (Pairof A B))]
+                       [replacement : R])
+         (delay/pure/stateless
+          (let ([tree (force tree-thunk)])
+            (let ([left-subtree (car tree)]
+                  [right-subtree (cdr tree)])
+              (cons (force (next-id (delay/pure/stateless left-subtree)
+                                    replacement))
+                    right-subtree)))))
+
+       (define-for-syntax (define-replace-in-tree low-names names rm-names τ* i depth)
+         (define/with-syntax name (vector-ref names (sub1 i)))
+         (define/with-syntax rm-name (vector-ref rm-names (sub1 i)))
+         (define/with-syntax low-name (vector-ref low-names (sub1 i)))
+         (define/with-syntax tree-type-with-replacement-name (gensym 'tree-type-with-replacement))
+         (define/with-syntax tree-replacement-type-name (gensym 'tree-replacement-type))
+         (define τ*-limited (take τ* depth))
+         (define τ*-limited+T-next (if (= depth 0)
+                                       (list #'T)
+                                       (append (take τ* (sub1 depth)) (list #'T))))
+         #`(begin
+             (provide name rm-name)
+             (define-type (tree-type-with-replacement-name #,@τ*-limited T)
+               (Promise #,(tree-type-with-replacement i #'T τ*-limited)))
+
+             (: low-name
+                (∀ (#,@τ*-limited T)
+                   (→ (tree-type-with-replacement-name #,@τ*-limited Any)
+                      T
+                      (tree-type-with-replacement-name #,@τ*-limited T))))
+             (define-pure/stateless
+               #:∀ (#,@τ*-limited T)
+               (low-name [tree-thunk : (tree-type-with-replacement-name #,@τ*-limited Any)]
+                         [replacement : T])
+               : (Promise #,(tree-type-with-replacement i #'T τ*-limited))
+               #,<make-replace-in-tree-body>)
+
+             (: name
+                (∀ (#,@τ*-limited T)
+                   (→ (tree-type-with-replacement-name #,@τ*-limited Any)
+                      T
+                      (tree-type-with-replacement-name #,@τ*-limited (Some T)))))
+             (define (name tree-thunk replacement)
+               (low-name tree-thunk (Some replacement)))
+             
+             (: rm-name
+                (∀ (#,@τ*-limited)
+                   (→ (tree-type-with-replacement-name #,@τ*-limited (Some Any))
+                      (tree-type-with-replacement-name #,@τ*-limited 'NONE))))
+             (define (rm-name tree-thunk)
+               (low-name tree-thunk 'NONE))))]
+
+♦section{Auxiliary values}
+
+The following sections reuse a few values which are derived from the list of
+fields:
+
+♦CHUNK[<utils>
+       (define all-fields #'(field …))
+       (define depth-above (ceiling-log2 (length (syntax->list #'(field …)))))
+       (define offset (expt 2 depth-above))
+       (define i*-above (range 1 (expt 2 depth-above)))
+       (define names (list->vector
+                      (append (map (λ (i) (format-id #'here "-with-~a" i))
+                                   i*-above)
+                              (stx-map (λ (f) (format-id f "with-~a" f))
+                                       #'(field …)))))
+       (define rm-names (list->vector
+                         (append (map (λ (i) (format-id #'here "-without-~a" i))
+                                      i*-above)
+                                 (stx-map (λ (f) (format-id f "without-~a" f))
+                                          #'(field …)))))
+       (define low-names (list->vector
+                          (append (map (λ (i) (format-id #'here "-u-with-~a" i))
+                                       i*-above)
+                                  (stx-map (λ (f) (format-id f "u-with-~a" f))
+                                           #'(field …)))))]
+
+♦section{Type of a tree-record}
+
+♦CHUNK[<τ-tree-with-fields>
+       (define-for-syntax (τ-tree-with-fields struct-fields fields)
+         (define/with-syntax (struct-field …) struct-fields)
+         (define/with-syntax (field …) fields)
+         <utils>
+         ;; Like in convert-from-struct
+         (define lookup
+           (make-free-id-table
+            (for/list ([n (in-syntax all-fields)]
+                       [i (in-naturals)])
+              (cons n (+ i offset)))))
+         (define fields+indices
+           (sort (stx-map λ.(cons % (free-id-table-ref lookup %))
+                          #'(struct-field …))
+                 <
+                 #:key cdr))
+  
+         (define up (* offset 2))
+
+         ;; Like in convert-fields, but with Pairof
+         (define (f i)
+           ;(displayln (list i '/ up (syntax->datum #`#,fields+indices)))
+           (if (and (pair? fields+indices) (= i (cdar fields+indices)))
+               (begin0
+                 `(Some ,(caar fields+indices))
+                 (set! fields+indices (cdr fields+indices)))
+               (if (>= (* i 2) up) ;; DEPTH
+                   ''NONE
+                   (begin
+                     `(Pairof ,(f (* i 2))
+                              ,(f (add1 (* i 2))))))))
+         (f 1))]
+
+♦section{Conversion to and from record-trees}
+
+♦CHUNK[<define-struct↔tree>
+       (define-for-syntax (define-struct↔tree
+                            offset all-fields τ* struct-name fields)
+         (define/with-syntax (field …) fields)
+         (define/with-syntax fields→tree-name
+           (format-id struct-name "~a→tree" struct-name))
+         (define/with-syntax tree→fields-name
+           (format-id struct-name "tree→~a" struct-name))
+         (define lookup
+           (make-free-id-table
+            (for/list ([n (in-syntax all-fields)]
+                       [i (in-naturals)])
+              (cons n (+ i offset)))))
+         (define fields+indices
+           (sort (stx-map λ.(cons % (free-id-table-ref lookup %))
+                          fields)
+                 <
+                 #:key cdr))
+         #`(begin
+             (: fields→tree-name (∀ (field …)
+                                    (→ field …
+                                       (Promise #,(τ-tree-with-fields #'(field …)
+                                                                      all-fields)))))
+             (define (fields→tree-name field …)
+               (delay/pure/stateless
+                #,(convert-fields (* offset 2) fields+indices)))
+
+             (: tree→fields-name (∀ (field …)
+                                    (→ (Promise #,(τ-tree-with-fields #'(field …)
+                                                                      all-fields))
+                                       (Values field …))))
+             (define (tree→fields-name tree-thunk)
+               (define tree (force tree-thunk))
+               #,(convert-back-fields (* offset 2) fields+indices))))]
+
+♦subsection{Creating a new tree-record}
+
+♦CHUNK[<convert-fields>
+       (define-for-syntax (convert-fields up fields+indices)
+         ;(displayln fields+indices)
+         (define (f i)
+           ;(displayln (list i '/ up (syntax->datum #`#,fields+indices)))
+           (if (and (pair? fields+indices) (= i (cdar fields+indices)))
+               (begin0
+                 `(Some ,(caar fields+indices))
+                 (set! fields+indices (cdr fields+indices)))
+               (if (>= (* i 2) up) ;; DEPTH
+                   ''NONE
+                   `(cons ,(f (* i 2))
+                          ,(f (add1 (* i 2)))))))
+         ;(displayln (syntax->datum #`#,(f 1)))
+         (f 1))]
+
+
+♦subsection{Extracting all the fields from a tree-record}
+
+We traverse the tree in preorder, and accumulate definitions naming the
+interesting subparts of the trees (those where there are fields).
+
+♦CHUNK[<convert-back-fields>
+       (define-for-syntax (convert-back-fields up fields+indices)
+         (define result '())
+         (define definitions '())
+         (define (f i t)
+           (if (and (pair? fields+indices) (= i (cdar fields+indices)))
+               (begin0
+                 (begin
+                   (set! result (cons #`(Some-v #,t) result))
+                   #t)
+                 (set! fields+indices (cdr fields+indices)))
+               (if (>= (* i 2) up) ;; DEPTH
+                   #f
+                   (let* ([left-t (string->symbol
+                                   (format "subtree-~a" (* i 2)))]
+                          [right-t (string->symbol
+                                    (format "subtree-~a" (add1 (* i 2))))]
+                          [left (f (* i 2) left-t)]
+                          [right (f (add1 (* i 2)) right-t)])
+                     (cond
+                       [(and left right)
+                        (set! definitions (cons #`(define #,left-t (car #,t))
+                                                definitions))
+                        (set! definitions (cons #`(define #,right-t (cdr #,t))
+                                                definitions))
+                        #t]
+                       [left
+                        (set! definitions (cons #`(define #,left-t (car #,t))
+                                                definitions))
+                        #t]
+                       [right
+                        (set! definitions (cons #`(define #,right-t (cdr #,t))
+                                                definitions))
+                        #t]
+                       [else
+                        #f])))))
+         (f 1 #'tree)
+         #`(begin #,@definitions (values . #,(reverse result))))]
+
+♦section{Defining the converters and accessors for each known record type}
+
+♦CHUNK[<define-trees>
+       (define-for-syntax (define-trees stx)
+         (syntax-case stx ()
+           [(bt-fields-id (field …) [struct struct-field …] …)
+            (let ()
+              <utils>
+              (define ∀-types (map λ.(format-id #'here "τ~a" %)
+                                   (range (add1 depth-above))))
+              (define total-nb-functions (vector-length names))
+              <define-trees-result>)]))]
+
+♦CHUNK[<bt-fields-type>
+       (define-for-syntax (bt-fields-type fields)
+         (λ (stx)
+           (syntax-case stx ()
+             [(_ . fs)
+              #`(∀ fs (Promise #,(τ-tree-with-fields #'fs
+                                                     fields)))])))]
+
+♦CHUNK[<define-trees-result>
+       #`(begin
+           (define-type-expander bt-fields-id
+             (bt-fields-type #'#,(syntax-local-introduce #'(field …))))
+           #,@(map λ.(define-replace-in-tree low-names
+                       names rm-names ∀-types % (floor-log2 %))
+                   (range 1 (add1 total-nb-functions)))
+           #;#,@(map λ.(define-remove-in-tree rm-names ∀-types % (floor-log2 %))
+                     (range 1 (add1 total-nb-functions)))
+           #,@(map λ.(define-struct↔tree
+                       offset all-fields ∀-types %1 %2)
+                   (syntax->list #'(struct …))
+                   (syntax->list #'([struct-field …] …))))]
+
+♦subsection{Putting it all together}
+
+♦chunk[<maybe>
+       (struct (T) Some ([v : T]) #:transparent)
+       (define-type (Maybe T) (U (Some T) 'NONE))]
+
+♦chunk[<*>
+       (require delay-pure
+                "flexible-with-utils.hl.rkt"
+                (for-syntax (rename-in racket/base [... …])
+                            syntax/stx
+                            racket/syntax
+                            racket/list
+                            syntax/id-table
+                            racket/sequence)
+                (for-meta 2 racket/base))
+
+       (provide (for-syntax define-trees)
+                ;; For tests:
+                (struct-out Some)
+
+                ;;DEBUG:
+                (for-syntax τ-tree-with-fields)
+                )
+       
+       <maybe>
+       <tree-type-with-replacement>
+       <define-replace-in-tree>
+       ;<define-remove-in-tree>
+       <convert-fields>
+       <convert-back-fields>
+       <τ-tree-with-fields>
+       <define-struct↔tree>
+       <define-trees>
+       <bt-fields-type>]
+
+♦include-section[(submod "flexible-with-utils.hl.rkt" doc)]
\ No newline at end of file
diff --git a/info.rkt b/info.rkt
index c190ec0..b8a96e6 100644
--- a/info.rkt
+++ b/info.rkt
@@ -24,7 +24,8 @@
                      "remember"
                      "typed-racket-doc"
                      "aful"
-                     "scribble-math"))
+                     "scribble-math"
+                     "at-exp-lib"))
 (define scribblings
   '(("scribblings/phc-graph.scrbl" ()
                                    ("Data Structures"))
diff --git a/main-draft.hl.rkt b/main-draft.hl.rkt
index 65bad4e..e096a34 100644
--- a/main-draft.hl.rkt
+++ b/main-draft.hl.rkt
@@ -37,6 +37,8 @@
             <polymorphic-node-types-and-mappings>
             ;<general-purpose-graph-algorithms>
             ;<garbage-collection>
+
+            
             |<phase~1: call mappings and extract placeholders>|
             ]))]
 
diff --git a/make-lang-example.rkt b/make-lang-example.rkt
new file mode 100644
index 0000000..3fb94a1
--- /dev/null
+++ b/make-lang-example.rkt
@@ -0,0 +1,3 @@
+#lang phc-graph/make-lang
+
+#:require (type-expander/lang phc-toolkit)
\ No newline at end of file
diff --git a/make-lang-use-example.rkt b/make-lang-use-example.rkt
new file mode 100644
index 0000000..18c6b07
--- /dev/null
+++ b/make-lang-use-example.rkt
@@ -0,0 +1,5 @@
+#lang phc-graph/make-lang-example
+(let ()
+  (ann 1 Number) ;; from type-expander/lang
+  (ann (∘ add1 sub1) (-> Number Number)) ;; From phc-toolkit
+  (void))
\ No newline at end of file
diff --git a/make-lang.rkt b/make-lang.rkt
new file mode 100644
index 0000000..abbab26
--- /dev/null
+++ b/make-lang.rkt
@@ -0,0 +1,46 @@
+#lang at-exp racket/base
+
+(module reader syntax/module-reader
+  phc-graph/make-lang)
+
+(provide (rename-out [-#%module-begin #%module-begin]))
+
+(require (for-syntax racket/base
+                     setup/collects)
+         scribble/manual)
+
+(define-syntax (-#%module-begin stx)
+  (syntax-case stx ()
+    [(self #:require req)
+     ;; TODO: isn't there a more reliable way to get the "require path"
+     ;;       for the source module of #'self ?
+     (let* ([src (syntax-source #'self)]
+            [modpath (path->module-path src)]
+            [md (if (and (pair? modpath)
+                         (eq? (car modpath) 'lib)
+                         (string? (cadr modpath))
+                         (null? (cddr modpath))
+                         (regexp-match ".rkt$" (cadr modpath)))
+                    (string->symbol
+                     (substring (cadr modpath)
+                                0
+                                (- (string-length (cadr modpath)) 4)))
+                    modpath)])
+       #`(-#%module-begin #:module #,md #:require req))]
+    [(_ #:module md ;; TODO: detect this automatically
+        #:require (req ...))
+     #`(#%module-begin
+        (module reader syntax/module-reader
+          md)
+        @module[scrbl racket/base (require scribble/manual)]{
+      @defmodule[md]{
+       This module language re-provides the following modules:
+       @itemlist[(item (racketmodname req)) ...]
+      }
+     }
+        (module doc racket/base
+          (require (submod ".." scrbl))
+          (provide (all-from-out (submod ".." scrbl))))
+        (require req ...)
+        (provide (all-from-out req ...)))]))
+