Now the language has full closures.

3 files changed, 231 insertions, 156 deletions

diff --git a/src/lang.clj b/src/lang.clj
index 0a958203b..84535356e 100644
--- a/src/lang.clj
+++ b/src/lang.clj
@@ -11,7 +11,6 @@
     (.write stream data)))
 
 (comment
-  ;; TODO: Allow "lambdas" to be closures.
   ;; TODO: Add Java-interop.
   ;; TODO: Allow loading classes/modules at runtime.
   ;; TODO: Add macros.
diff --git a/src/lang/analyser.clj b/src/lang/analyser.clj
index 109ba15f6..1e1be1d7b 100644
--- a/src/lang/analyser.clj
+++ b/src/lang/analyser.clj
@@ -41,6 +41,40 @@
   (fn [state]
     [::&util/ok [state (-> state :env first)]]))
 
+(defn ^:private with-scope [scope body]
+  (fn [state]
+    (let [=return (body (-> state
+                            (update-in [:lambda-scope 0] conj scope)
+                            (assoc-in [:lambda-scope 1] 0)))]
+      (match =return
+        [::&util/ok [?state ?value]]
+        [::&util/ok [(assoc ?state :lambda-scope (:lambda-scope state)) ?value]]
+        
+        _
+        =return))))
+
+(defn ^:private with-lambda-scope [body]
+  (fn [state]
+    (let [_ (prn 'with-lambda-scope (get-in state [:lambda-scope 0]) (get-in state [:lambda-scope 1]))
+          =return (body (-> state
+                            (update-in [:lambda-scope 0] conj (get-in state [:lambda-scope 1]))
+                            (assoc-in [:lambda-scope 1] 0)))]
+      (match =return
+        [::&util/ok [?state ?value]]
+        [::&util/ok [(do (prn [:lambda-scope 0] (get-in ?state [:lambda-scope 0]))
+                       (prn [:lambda-scope 1] (get-in ?state [:lambda-scope 1]))
+                       (-> ?state
+                           (update-in [:lambda-scope 0] pop)
+                           (assoc-in [:lambda-scope 1] (inc (get-in state [:lambda-scope 1])))))
+                     ?value]]
+        
+        _
+        =return))))
+
+(def ^:private scope
+  (fn [state]
+    [::&util/ok [state (get-in state [:lambda-scope 0])]]))
+
 (defn ^:private with-local [name type body]
   (fn [state]
     (let [=return (body (update-in state [:env]
@@ -51,34 +85,49 @@
       ;; =return
       (match =return
         [::&util/ok [?state ?value]]
-        (do (prn 'POST-WITH-LOCAL name (-> ?state :env first))
-          [::&util/ok [(update-in ?state [:env] #(cons (-> (first %)
-                                                           (update-in [:counter] dec)
-                                                           (update-in [:mappings] dissoc name))
-                                                       (rest %)))
-                       ;; (update-in ?state [:env] (fn [[top & oframes]]
-                       ;;                            (prn 'NEW-FRAMES name (cons (-> state :env first (assoc :closure (-> top :closure))) oframes))
-                       ;;                            (cons (-> state :env first (assoc :closure (-> top :closure))) oframes)))
-                       ?value]])
+        (do ;; (prn 'POST-WITH-LOCAL name (-> ?state :env first))
+            [::&util/ok [(update-in ?state [:env] #(cons (-> (first %)
+                                                             (update-in [:counter] dec)
+                                                             (update-in [:mappings] dissoc name))
+                                                         (rest %)))
+                         ;; (update-in ?state [:env] (fn [[top & oframes]]
+                         ;;                            (prn 'NEW-FRAMES name (cons (-> state :env first (assoc :closure (-> top :closure))) oframes))
+                         ;;                            (cons (-> state :env first (assoc :closure (-> top :closure))) oframes)))
+                         ?value]])
         
         _
         =return)
       )))
 
-(defn ^:private with-fresh-env [body]
-  (fn [state]
-    ;; (prn '(:env state) (:env state) (-> state :env first :id inc))
-    (let [=return (body (update-in state [:env] #(conj % (fresh-env (-> % first :id inc)))))
-          ;; _ (prn '=return =return)
-          ]
-      (match =return
-        [::&util/ok [?state ?value]]
-        (do (prn 'PRE-LAMBDA (:env state))
-          (prn 'POST-LAMBDA (:env ?state) ?value)
-          [::&util/ok [(assoc ?state :env (:env state)) [(-> ?state :env first) ?value]]])
-        
-        _
-        =return))))
+(defn ^:private with-fresh-env [[args-vars args-types] body]
+  (with-lambda-scope
+    (fn [state]
+      ;; (prn '(:env state) (:env state) (-> state :env first :id inc))
+      (let [state* (update-in state [:env]
+                              (fn [outer]
+                                (let [frame-id (-> outer first :id inc)
+                                      new-top (reduce (fn [frame [name type]]
+                                                        (-> frame
+                                                            (update-in [:counter] inc)
+                                                            (assoc-in [:mappings name] (annotated [::local frame-id (:counter frame)] type))))
+                                                      (update-in (fresh-env frame-id) [:counter] inc)
+                                                      (map vector args-vars args-types))]
+                                  (conj outer new-top))))
+            =return (body state*)
+            ;; _ (prn '=return =return)
+            ]
+        (match =return
+          [::&util/ok [?state ?value]]
+          (do (prn 'PRE-LAMBDA (:env state))
+            (prn 'POST-LAMBDA (:env ?state) ?value)
+            [::&util/ok [(-> ?state
+                             (update-in [:env] rest)
+                             ;; (update-in [:lambda-scope 1] inc)
+                             )
+                         [(get-in ?state [:lambda-scope 0]) (-> ?state :env first) ?value]]])
+          
+          _
+          =return)))))
 
 (defn ^:private import-class [long-name short-name]
   (fn [state]
@@ -92,9 +141,9 @@
     [::&util/ok [(assoc-in state [:deps alias] name)
                  nil]]))
 
-(defn ^:private close-over [ident register frame]
-  (prn 'close-over ident register)
-  (let [register* (annotated [::captured (:id frame) (:closure/id frame) register] (:type register))]
+(defn ^:private close-over [scope ident register frame]
+  ;; (prn 'close-over scope ident register)
+  (let [register* (annotated [::captured scope (:closure/id frame) register] (:type register))]
     [register* (-> frame
                    (update-in [:closure/id] inc)
                    (assoc-in [:mappings ident] register*))]))
@@ -120,11 +169,16 @@
                 [::&util/failure (str "Unresolved identifier: " ident)])
 
               :else
-              (let [[=local inner*] (reduce (fn [[register new-inner] frame]
-                                              (let [[register* frame*] (close-over ident register frame)]
+              (let [[=local inner*] (reduce (fn [[register new-inner] [frame scope]]
+                                              (let [[register* frame*] (close-over scope ident register frame)]
                                                 [register* (cons frame* new-inner)]))
                                             [(-> outer first :mappings (get ident)) '()]
-                                            (reverse inner))
+                                            (map vector
+                                                 (reverse inner)
+                                                 (->> (get-in state [:lambda-scope 0])
+                                                      (iterate pop)
+                                                      (take (count inner))
+                                                      reverse)))
                     _ (prn 'resolve/_4 '[=local inner*] =local inner*)]
                 [::&util/ok [(assoc state :env (concat inner* outer)) =local]])))
       )))
@@ -184,7 +238,9 @@
   ;;        ]
   ;;   (resolve ?ident))
   (exec [=ident (resolve ?ident)
-         :let [_ (prn 'analyse-ident ?ident =ident)]]
+         ;; :let [_ (prn 'analyse-ident ?ident =ident)]
+         state &util/get-state
+         :let [_ (prn 'analyse-ident ?ident (:form =ident) (:env state))]]
     (return =ident)))
 
 (defanalyser analyse-ann-class
@@ -286,7 +342,8 @@
   [::&parser/def ?usage ?value]
   (match ?usage
     [::&parser/ident ?name]
-    (exec [=value (analyse-form* ?value)
+    (exec [=value (with-scope ?name
+                    (analyse-form* ?value))
            _ (define ?name {:mode ::constant
                             :access ::public
                             :type (:type =value)})]
@@ -303,10 +360,11 @@
              ;;               (assoc ?name =function)
              ;;               (into (map vector args =args)))
              ;;       _ (prn 'env env)]
-             =value (reduce (fn [inner [label type]]
-                              (with-local label type inner))
-                            (analyse-form* ?value)
-                            (reverse (map vector args =args)))
+             =value (with-scope ?name
+                      (reduce (fn [inner [label type]]
+                                (with-local label type inner))
+                              (analyse-form* ?value)
+                              (reverse (map vector args =args))))
              ;; :let [_ (prn '=value =value)]
              =function (within :types (exec [_ (&type/solve =return (:type =value))]
                                         (&type/clean =function)))
@@ -325,20 +383,14 @@
          ;; :let [_ (prn 'PRE/?body ?body)]
          ;; _env (fn [state] [::&util/ok [state (:env state)]])
          ;; :let [_ (prn 'analyse-lambda _env)]
-         [=frame =body] (with-fresh-env
-                          (reduce (fn [inner [label type]]
-                                    (exec [=inner (with-local label type inner)
-                                           =frame* my-frame
-                                           :let [_ (prn '=frame* =frame*)]]
-                                      (return =inner)))
-                                  (analyse-form* ?body)
-                                  (reverse (map vector ?args =args))))
+         [=scope =frame =body] (with-fresh-env [?args =args]
+                                 (analyse-form* ?body))
          ;; :let [_ (prn '=body =body)]
          =function (within :types (exec [_ (&type/solve =return (:type =body))]
                                     (&type/clean =function)))
          ;; :let [_ (prn '=function =function)]
          ]
-    (return (annotated [::lambda =frame ?args =body] =function))))
+    (return (annotated [::lambda =scope =frame ?args =body] =function))))
 
 (defanalyser analyse-import
   [::&parser/import ?class]
@@ -380,14 +432,16 @@
 
 ;; [Interface]
 (defn analyse [module-name tokens]
-  (match ((repeat-m analyse-form) {:name module-name,
-                                   :forms tokens
-                                   :deps {}
-                                   :imports {}
-                                   :defs {}
-                                   :defs-env {}
-                                   :env (list (fresh-env 0))
-                                   :types &type/+init+})
+  (match ((repeat-m (with-scope module-name
+                      analyse-form)) {:name module-name,
+                                      :forms tokens
+                                      :deps {}
+                                      :imports {}
+                                      :defs {}
+                                      :defs-env {}
+                                      :lambda-scope [[] 0]
+                                      :env (list (fresh-env 0))
+                                      :types &type/+init+})
     [::&util/ok [?state ?forms]]
     (if (empty? (:forms ?state))
       ?forms
diff --git a/src/lang/compiler.clj b/src/lang/compiler.clj
index f2c57f410..bd64563e8 100644
--- a/src/lang/compiler.clj
+++ b/src/lang/compiler.clj
@@ -119,16 +119,16 @@
 
 (defcompiler ^:private compile-local
   [::&analyser/local ?env ?idx]
-  (do (prn 'LOCAL ?idx)
+  (do ;; (prn 'LOCAL ?idx)
       (doto *writer*
         (.visitVarInsn Opcodes/ALOAD (int ?idx)))))
 
 (defcompiler ^:private compile-captured
-  [::&analyser/captured ?closure-id ?captured-id ?source]
-  (do (prn 'CAPTURED [?closure-id ?captured-id])
+  [::&analyser/captured ?scope ?captured-id ?source]
+  (do (prn 'CAPTURED [?scope ?captured-id])
     (doto *writer*
       (.visitVarInsn Opcodes/ALOAD 0)
-      (.visitFieldInsn Opcodes/GETFIELD (str "test2" "$" "lambda") (str "__" (inc ?captured-id)) "Ljava/lang/Object;"))))
+      (.visitFieldInsn Opcodes/GETFIELD (apply str (interpose "$" ?scope)) (str "__" ?captured-id) "Ljava/lang/Object;"))))
 
 (defcompiler ^:private compile-global
   [::&analyser/global ?owner-class ?name]
@@ -311,10 +311,10 @@
                           ;; (.visitMethodInsn Opcodes/INVOKEVIRTUAL (->class "java.io.PrintStream") "println" "(Ljava/lang/Object;)V")
 
                           (.visitVarInsn Opcodes/ALOAD 0)
-                          (.visitVarInsn Opcodes/ILOAD 1)
+                        (.visitVarInsn Opcodes/ILOAD 1)
                         ;; (.visitInsn Opcodes/ICONST_0)
                         
-                          (.visitFieldInsn Opcodes/PUTFIELD current-class "_counter" counter-sig)
+                        (.visitFieldInsn Opcodes/PUTFIELD current-class "_counter" counter-sig)
                         (-> (doto (.visitVarInsn Opcodes/ALOAD 0)
                               (.visitVarInsn Opcodes/ALOAD (+ clo_idx 2))
                               (.visitFieldInsn Opcodes/PUTFIELD current-class field-name clo-field-sig))
@@ -414,118 +414,140 @@
               (compile-method-function *writer* *class-name* ?name (count ?args) ?body *state*)))
         )))
 
+(defn ^:private captured? [form]
+  (match form
+    [::&analyser/captured ?closure-id ?captured-id ?source]
+    true
+    _
+    false))
+
 (defcompiler ^:private compile-lambda
-  [::&analyser/lambda ?frame ?args ?body]
-  (let [_ (prn '?frame ?frame)
+  [::&analyser/lambda ?scope ?frame ?args ?body]
+  (let [_ (prn '[?scope ?frame] ?scope ?frame)
         num-args (count ?args)
         outer-class (->class *class-name*)
         clo-field-sig (->type-signature "java.lang.Object")
         counter-sig "I"
         apply-signature "(Ljava/lang/Object;)Ljava/lang/Object;"
         real-signature (str "(" (apply str (repeat num-args clo-field-sig)) ")" "Ljava/lang/Object;")
-        current-class (str outer-class "$" "lambda")
+        current-class (apply str (interpose "$" ?scope))
         num-captured (dec num-args)
-        init-signature (if (not= 0 num-captured)
-                         (str "(" (apply str (repeat (count (:mappings ?frame)) clo-field-sig))
-                              counter-sig
-                              (apply str (repeat num-captured clo-field-sig)) ")" "V")
-                         (str "()" "V"))]
-    ;; (.visitInnerClass *parent* current-class outer-class nil (+ Opcodes/ACC_STATIC Opcodes/ACC_SYNTHETIC))
-    (let [=class (doto (new ClassWriter ClassWriter/COMPUTE_MAXS)
-                   (.visit Opcodes/V1_5 (+ Opcodes/ACC_PUBLIC Opcodes/ACC_FINAL Opcodes/ACC_SUPER)
-                           current-class nil "java/lang/Object" (into-array ["test2/Function"]))
-                   (-> (doto (.visitField (+ Opcodes/ACC_PRIVATE Opcodes/ACC_FINAL) "_counter" counter-sig nil nil)
-                         (.visitEnd))
-                       (->> (when (not= 0 num-captured)))))
-          =init (doto (.visitMethod =class Opcodes/ACC_PUBLIC "<init>" init-signature nil nil)
-                  (.visitCode)
-                  (.visitVarInsn Opcodes/ALOAD 0)
-                  (.visitMethodInsn Opcodes/INVOKESPECIAL "java/lang/Object" "<init>" "()V")
-                  (-> (doto (-> (doto (.visitVarInsn Opcodes/ALOAD 0)
-                                  (.visitVarInsn Opcodes/ALOAD (inc ?captured-id))
-                                  (.visitFieldInsn Opcodes/PUTFIELD current-class captured-name clo-field-sig))
-                                (do (doto =class
-                                      (.visitField (+ Opcodes/ACC_PRIVATE Opcodes/ACC_FINAL) captured-name clo-field-sig nil nil)
-                                      (.visitEnd)))
-                                (->> (let [captured-name (str "__" (inc ?captured-id))])
-                                     (match (:form ?captured)
-                                       [::&analyser/captured ?closure-id ?captured-id ?source])
-                                     (doseq [[?name ?captured] (:mappings ?frame)])))
-                        (.visitVarInsn Opcodes/ALOAD 0)
-                        (.visitVarInsn Opcodes/ILOAD (inc (count (:mappings ?frame))))
-                        (.visitFieldInsn Opcodes/PUTFIELD current-class "_counter" counter-sig)
-                        (-> (doto (.visitVarInsn Opcodes/ALOAD 0)
-                              (.visitVarInsn Opcodes/ALOAD (+ clo_idx offset))
-                              (.visitFieldInsn Opcodes/PUTFIELD current-class field-name clo-field-sig))
-                            (->> (let [field-name (str "_" clo_idx)]
-                                   (doto (.visitField =class (+ Opcodes/ACC_PRIVATE Opcodes/ACC_FINAL) field-name clo-field-sig nil nil)
-                                     (.visitEnd)))
-                                 (dotimes [clo_idx num-captured])
-                                 (let [offset (+ 2 (count (:mappings ?frame)))]))))
-                      (->> (when (not= 0 num-captured))))
-                  (.visitInsn Opcodes/RETURN)
-                  (.visitMaxs 0 0)
-                  (.visitEnd))
-          =method (let [default-label (new Label)
-                        branch-labels (for [_ (range num-captured)]
-                                        (new Label))]
-                    (doto (.visitMethod =class Opcodes/ACC_PUBLIC "apply" apply-signature nil nil)
-                      (.visitCode)
-                      (.visitVarInsn Opcodes/ALOAD 0)
+        init-signature (str "(" (apply str (repeat (->> (:mappings ?frame)
+                                                        (map (comp :form second))
+                                                        (filter captured?)
+                                                        count)
+                                                   clo-field-sig))
+                            (if (not= 0 num-captured)
+                              (apply str counter-sig (repeat num-captured clo-field-sig)))
+                            ")"
+                            "V")
+        _ (prn current-class 'init-signature init-signature)
+        _ (prn current-class 'real-signature real-signature)
+        =class (doto (new ClassWriter ClassWriter/COMPUTE_MAXS)
+                 (.visit Opcodes/V1_5 (+ Opcodes/ACC_PUBLIC Opcodes/ACC_FINAL Opcodes/ACC_SUPER)
+                         current-class nil "java/lang/Object" (into-array ["test2/Function"]))
+                 (-> (doto (.visitField (+ Opcodes/ACC_PRIVATE Opcodes/ACC_FINAL) captured-name clo-field-sig nil nil)
+                       (.visitEnd))
+                     (->> (let [captured-name (str "__" ?captured-id)])
+                          (match (:form ?captured)
+                            [::&analyser/captured ?closure-id ?captured-id ?source])
+                          (doseq [[?name ?captured] (:mappings ?frame)
+                                  :when (captured? (:form ?captured))])))
+                 (-> (doto (.visitField (+ Opcodes/ACC_PRIVATE Opcodes/ACC_FINAL) "_counter" counter-sig nil nil)
+                       (.visitEnd))
+                     (->> (when (not= 0 num-captured)))))
+        =init (doto (.visitMethod =class Opcodes/ACC_PUBLIC "<init>" init-signature nil nil)
+                (.visitCode)
+                (.visitVarInsn Opcodes/ALOAD 0)
+                (.visitMethodInsn Opcodes/INVOKESPECIAL "java/lang/Object" "<init>" "()V")
+                (-> (doto (.visitVarInsn Opcodes/ALOAD 0)
+                      (.visitVarInsn Opcodes/ALOAD (inc ?captured-id))
+                      (.visitFieldInsn Opcodes/PUTFIELD current-class captured-name clo-field-sig))
+                    (->> (let [captured-name (str "__" ?captured-id)])
+                         (match (:form ?captured)
+                           [::&analyser/captured ?closure-id ?captured-id ?source])
+                         (doseq [[?name ?captured] (:mappings ?frame)
+                                 :when (captured? (:form ?captured))])))
+                (-> (doto (.visitVarInsn Opcodes/ALOAD 0)
+                      (.visitVarInsn Opcodes/ILOAD (inc (count (:mappings ?frame))))
+                      (.visitFieldInsn Opcodes/PUTFIELD current-class "_counter" counter-sig)
                       (-> (doto (.visitVarInsn Opcodes/ALOAD 0)
-                            (.visitFieldInsn Opcodes/GETFIELD current-class "_counter" counter-sig)
-                            (.visitTableSwitchInsn 0 (dec num-captured) default-label (into-array Label branch-labels))
-                            (-> (doto (.visitLabel branch-label)
-                                  (.visitTypeInsn Opcodes/NEW current-class)
-                                  (.visitInsn Opcodes/DUP)
-                                  (-> (doto (.visitVarInsn Opcodes/ALOAD 0)
-                                        (.visitFieldInsn Opcodes/GETFIELD current-class (str "__" (inc capt_idx)) clo-field-sig))
-                                      (->> (dotimes [capt_idx (count (:mappings ?frame))])))
-                                  (.visitVarInsn Opcodes/ALOAD 0)
-                                  (.visitFieldInsn Opcodes/GETFIELD current-class "_counter" counter-sig)
-                                  (.visitInsn Opcodes/ICONST_1)
-                                  (.visitInsn Opcodes/IADD)
-                                  (-> (doto (.visitVarInsn Opcodes/ALOAD 0)
-                                        (.visitFieldInsn Opcodes/GETFIELD current-class (str "_" clo_idx) clo-field-sig))
-                                      (->> (dotimes [clo_idx current-captured])))
-                                  (.visitVarInsn Opcodes/ALOAD 1)
-                                  (-> (.visitInsn Opcodes/ACONST_NULL)
-                                      (->> (dotimes [clo_idx (- (dec num-captured) current-captured)])))
-                                  (.visitMethodInsn Opcodes/INVOKESPECIAL current-class "<init>" init-signature)
-                                  ;; (.visitJumpInsn Opcodes/GOTO end-label)
-                                  (.visitInsn Opcodes/ARETURN))
-                                (->> (doseq [[branch-label current-captured] (map vector branch-labels (range (count branch-labels)))
-                                             ;; :let [_ (prn '[branch-label current-captured] [branch-label current-captured])]
-                                             ])))
-                            (.visitLabel default-label)
-                            (-> (doto (.visitVarInsn Opcodes/ALOAD 0)
-                                  (.visitFieldInsn Opcodes/GETFIELD current-class (str "_" clo_idx) clo-field-sig))
-                                (->> (dotimes [clo_idx num-captured]))))
-                          (->> (when (not= 0 num-captured))))
-                      (.visitVarInsn Opcodes/ALOAD 1)
-                      (.visitMethodInsn Opcodes/INVOKEVIRTUAL current-class "impl" real-signature)
-                      ;; (.visitLabel end-label)
-                      (.visitInsn Opcodes/ARETURN)
-                      (.visitMaxs 0 0)
-                      (.visitEnd)))
-          _ (prn 'LAMBDA/?body ?body)
-          =impl (doto (.visitMethod =class (+ Opcodes/ACC_PUBLIC ;; Opcodes/ACC_STATIC
-                                              ) "impl" real-signature nil nil)
-                  (.visitCode)
-                  (->> (assoc *state* :form ?body :writer)
-                       compile-form)
-                  (.visitInsn Opcodes/ARETURN)
-                  (.visitMaxs 0 0)
-                  (.visitEnd))
-          _ (.visitEnd =class)]
-      (write-file (str current-class ".class") (.toByteArray =class)))
+                            (.visitVarInsn Opcodes/ALOAD (+ clo_idx offset))
+                            (.visitFieldInsn Opcodes/PUTFIELD current-class field-name clo-field-sig))
+                          (->> (let [field-name (str "_" clo_idx)]
+                                 (doto (.visitField =class (+ Opcodes/ACC_PRIVATE Opcodes/ACC_FINAL) field-name clo-field-sig nil nil)
+                                   (.visitEnd)))
+                               (dotimes [clo_idx num-captured])
+                               (let [offset (+ 2 (count (:mappings ?frame)))]))))
+                    (->> (when (not= 0 num-captured))))
+                (.visitInsn Opcodes/RETURN)
+                (.visitMaxs 0 0)
+                (.visitEnd))
+        =method (let [default-label (new Label)
+                      branch-labels (for [_ (range num-captured)]
+                                      (new Label))]
+                  (doto (.visitMethod =class Opcodes/ACC_PUBLIC "apply" apply-signature nil nil)
+                    (.visitCode)
+                    (.visitVarInsn Opcodes/ALOAD 0)
+                    (-> (doto (.visitVarInsn Opcodes/ALOAD 0)
+                          (.visitFieldInsn Opcodes/GETFIELD current-class "_counter" counter-sig)
+                          (.visitTableSwitchInsn 0 (dec num-captured) default-label (into-array Label branch-labels))
+                          (-> (doto (.visitLabel branch-label)
+                                (.visitTypeInsn Opcodes/NEW current-class)
+                                (.visitInsn Opcodes/DUP)
+                                (-> (doto (.visitVarInsn Opcodes/ALOAD 0)
+                                      (.visitFieldInsn Opcodes/GETFIELD current-class (str "__" capt_idx) clo-field-sig))
+                                    (->> (dotimes [capt_idx (count (:mappings ?frame))])))
+                                (.visitVarInsn Opcodes/ALOAD 0)
+                                (.visitFieldInsn Opcodes/GETFIELD current-class "_counter" counter-sig)
+                                (.visitInsn Opcodes/ICONST_1)
+                                (.visitInsn Opcodes/IADD)
+                                (-> (doto (.visitVarInsn Opcodes/ALOAD 0)
+                                      (.visitFieldInsn Opcodes/GETFIELD current-class (str "_" clo_idx) clo-field-sig))
+                                    (->> (dotimes [clo_idx current-captured])))
+                                (.visitVarInsn Opcodes/ALOAD 1)
+                                (-> (.visitInsn Opcodes/ACONST_NULL)
+                                    (->> (dotimes [clo_idx (- (dec num-captured) current-captured)])))
+                                (.visitMethodInsn Opcodes/INVOKESPECIAL current-class "<init>" init-signature)
+                                ;; (.visitJumpInsn Opcodes/GOTO end-label)
+                                (.visitInsn Opcodes/ARETURN))
+                              (->> (doseq [[branch-label current-captured] (map vector branch-labels (range (count branch-labels)))
+                                           ;; :let [_ (prn '[branch-label current-captured] [branch-label current-captured])]
+                                           ])))
+                          (.visitLabel default-label)
+                          (-> (doto (.visitVarInsn Opcodes/ALOAD 0)
+                                (.visitFieldInsn Opcodes/GETFIELD current-class (str "_" clo_idx) clo-field-sig))
+                              (->> (dotimes [clo_idx num-captured]))))
+                        (->> (when (not= 0 num-captured))))
+                    (.visitVarInsn Opcodes/ALOAD 1)
+                    (.visitMethodInsn Opcodes/INVOKEVIRTUAL current-class "impl" real-signature)
+                    ;; (.visitLabel end-label)
+                    (.visitInsn Opcodes/ARETURN)
+                    (.visitMaxs 0 0)
+                    (.visitEnd)))
+        ;; _ (prn 'LAMBDA/?body ?body)
+        =impl (doto (.visitMethod =class (+ Opcodes/ACC_PUBLIC ;; Opcodes/ACC_STATIC
+                                            ) "impl" real-signature nil nil)
+                (.visitCode)
+                (->> (assoc *state* :form ?body :writer)
+                     compile-form)
+                (.visitInsn Opcodes/ARETURN)
+                (.visitMaxs 0 0)
+                (.visitEnd))
+        _ (.visitEnd =class)]
+    (write-file (str current-class ".class") (.toByteArray =class))
+    (apply prn 'LAMBDA ?scope ?args (->> (:mappings ?frame)
+                                         (map second)
+                                         (map :form)
+                                         (filter captured?)))
     (doto *writer*
       (.visitTypeInsn Opcodes/NEW current-class)
       (.visitInsn Opcodes/DUP)
       (-> (do (compile-form (assoc *state* :form ?source)))
           (->> (match (:form ?captured)
                  [::&analyser/captured ?closure-id ?captured-id ?source])
-               (doseq [[?name ?captured] (:mappings ?frame)])))
+               (doseq [[?name ?captured] (:mappings ?frame)
+                       :when (captured? (:form ?captured))])))
       (-> (doto (.visitInsn Opcodes/ICONST_0)
             ;; (.visitInsn Opcodes/ICONST_0)
             (-> (.visitInsn Opcodes/ACONST_NULL)