diff -r 1bfe46affd2e Lib/idlelib/rpc.py
--- a/Lib/idlelib/rpc.py	Wed Jul 09 00:02:39 2014 +0300
+++ b/Lib/idlelib/rpc.py	Wed Jul 16 17:17:17 2014 +0300
@@ -29,6 +29,7 @@
 
 import sys
 import os
+import io
 import socket
 import select
 import socketserver
@@ -41,6 +42,7 @@
 import types
 import marshal
 import builtins
+from collections import ChainMap
 
 
 def unpickle_code(ms):
@@ -61,7 +63,17 @@
 #      assert isinstance(fn, type.FunctionType)
 #      return repr(fn)
 
-copyreg.pickle(types.CodeType, pickle_code, unpickle_code)
+def dumps(obj, protocol=None):
+    f = io.BytesIO()
+    p = CodePickler(f, protocol)
+    p.dump(obj)
+    return f.getvalue()
+
+class CodePickler(pickle.Pickler):
+    dispatch_table = ChainMap({}, copyreg.dispatch_table)
+
+CodePickler.dispatch_table[types.CodeType] = pickle_code
+
 # copyreg.pickle(types.FunctionType, pickle_function, unpickle_function)
 
 BUFSIZE = 8*1024
@@ -329,7 +341,7 @@
     def putmessage(self, message):
         self.debug("putmessage:%d:" % message[0])
         try:
-            s = pickle.dumps(message)
+            s = dumps(message)
         except pickle.PicklingError:
             print("Cannot pickle:", repr(message), file=sys.__stderr__)
             raise