diff --git a/src/coffi/ffi.clj b/src/coffi/ffi.clj
index ed07fbe..bd22286 100644
--- a/src/coffi/ffi.clj
+++ b/src/coffi/ffi.clj
@@ -586,63 +586,6 @@
          ~@(list (:doc args))
          fun#))))
 
-(comment
-
-  (let [args-types [::c-string]
-        ret-type ::int
-        downcall (downcall-handle
-                  (find-symbol "strlen")
-                  (method-type args-types ret-type)
-                  (function-descriptor args-types ret-type))
-        invoke (insn/new-instance
-                {:flags #{:public :final}
-                 :super clojure.lang.AFunction
-                 :fields [{:name "downcall_handle"
-                           :type MethodHandle
-                           :flags #{:final}}]
-                 :methods [{:name :init
-                            :flags #{:public}
-                            :desc [MethodHandle :void]
-                            :emit [[:aload 0]
-                                   [:dup]
-                                   [:invokespecial :super :init [:void]]
-                                   [:aload 1]
-                                   [:putfield :this "downcall_handle" MethodHandle]
-                                   [:return]]}
-                           {:name :invoke
-                            :flags #{:public}
-                            :desc [Object Object]
-                            :emit [
-                                   ;; load the handle
-                                   [:aload 0]
-                                   [:getfield :this "downcall_handle" MethodHandle]
-                                   ;; load the arguments
-                                   [:aload 1]
-                                   ;; invokeExact
-                                   [:invokevirtual MethodHandle "invokeExact" [MemoryAddress :int]]
-                                   ;; convert to object
-                                   [:istore 2]
-                                   [:new Integer]
-                                   [:dup]
-                                   [:iload 2]
-                                   [:invokespecial Integer :init [:int :void]]
-                                   ;; return
-                                   [:areturn]
-                                   ]}]}
-                downcall)
-        strlen (fn [str]
-                 (with-open [scope (stack-scope)]
-                   (let [arg1 (serialize (nth args-types 0) str scope)]
-                     (deserialize* (invoke arg1) ret-type))))
-        fun strlen]
-    (def
-      ^{:arglists '([str])}
-      strlen
-      "Counts the number of bytes in a C string."
-      fun))
-
-  )
-
 #_:clj-kondo/ignore
 (comment
   ;;; Prospective syntax for ffi