Index: Doc/library/types.rst
===================================================================
--- Doc/library/types.rst	(revision 61570)
+++ Doc/library/types.rst	(working copy)
@@ -72,8 +72,12 @@
 
    The type of floating point numbers (e.g. ``1.0``); alias of the built-in
    :class:`float`.
+   
+.. data:: CellType
 
+   The type of cell objects.
 
+
 .. data:: ComplexType
 
    The type of complex numbers (e.g. ``1.0j``).  This is not defined if Python was
Index: Lib/types.py
===================================================================
--- Lib/types.py	(revision 61570)
+++ Lib/types.py	(working copy)
@@ -52,6 +52,13 @@
     yield 1
 GeneratorType = type(_g())
 
+def f(x=None):
+   def g():
+      x
+   return g
+CellType = type(f().func_closure[0])
+del f
+
 class _C:
     def _m(self): pass
 ClassType = type(_C)