diff -r 20bb8babc505 Lib/functools.py
--- a/Lib/functools.py	Wed Nov 30 12:10:54 2016 +0100
+++ b/Lib/functools.py	Thu Dec 01 16:05:51 2016 +0200
@@ -400,7 +400,7 @@ class partialmethod(object):
 ### LRU Cache function decorator
 ################################################################################
 
-_CacheInfo = namedtuple("CacheInfo", ["hits", "misses", "maxsize", "currsize"])
+from functools_CacheInfo import CacheInfo as _CacheInfo
 
 class _HashedSeq(list):
     """ This class guarantees that hash() will be called no more than once
diff -r 20bb8babc505 Lib/functools_CacheInfo.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Lib/functools_CacheInfo.py	Thu Dec 01 16:05:51 2016 +0200
@@ -0,0 +1,53 @@
+from builtins import property as _property, tuple as _tuple
+from operator import itemgetter as _itemgetter
+from collections import OrderedDict
+
+class CacheInfo(tuple):
+    'CacheInfo(hits, misses, maxsize, currsize)'
+
+    __slots__ = ()
+
+    _fields = ('hits', 'misses', 'maxsize', 'currsize')
+
+    def __new__(_cls, hits, misses, maxsize, currsize):
+        'Create new instance of CacheInfo(hits, misses, maxsize, currsize)'
+        return _tuple.__new__(_cls, (hits, misses, maxsize, currsize))
+
+    @classmethod
+    def _make(cls, iterable, new=tuple.__new__, len=len):
+        'Make a new CacheInfo object from a sequence or iterable'
+        result = new(cls, iterable)
+        if len(result) != 4:
+            raise TypeError('Expected 4 arguments, got %d' % len(result))
+        return result
+
+    def _replace(_self, **kwds):
+        'Return a new CacheInfo object replacing specified fields with new values'
+        result = _self._make(map(kwds.pop, ('hits', 'misses', 'maxsize', 'currsize'), _self))
+        if kwds:
+            raise ValueError('Got unexpected field names: %r' % list(kwds))
+        return result
+
+    def __repr__(self):
+        'Return a nicely formatted representation string'
+        return self.__class__.__name__ + '(hits=%r, misses=%r, maxsize=%r, currsize=%r)' % self
+
+    def _asdict(self):
+        'Return a new OrderedDict which maps field names to their values.'
+        return OrderedDict(zip(self._fields, self))
+
+    def __getnewargs__(self):
+        'Return self as a plain tuple.  Used by copy and pickle.'
+        return tuple(self)
+
+    hits = _property(_itemgetter(0), doc='Alias for field number 0')
+
+    misses = _property(_itemgetter(1), doc='Alias for field number 1')
+
+    maxsize = _property(_itemgetter(2), doc='Alias for field number 2')
+
+    currsize = _property(_itemgetter(3), doc='Alias for field number 3')
+
+
+CacheInfo.__module__ = 'functools'
+CacheInfo._source = "from builtins import property as _property, tuple as _tuple\nfrom operator import itemgetter as _itemgetter\nfrom collections import OrderedDict\n\nclass CacheInfo(tuple):\n    'CacheInfo(hits, misses, maxsize, currsize)'\n\n    __slots__ = ()\n\n    _fields = ('hits', 'misses', 'maxsize', 'currsize')\n\n    def __new__(_cls, hits, misses, maxsize, currsize):\n        'Create new instance of CacheInfo(hits, misses, maxsize, currsize)'\n        return _tuple.__new__(_cls, (hits, misses, maxsize, currsize))\n\n    @classmethod\n    def _make(cls, iterable, new=tuple.__new__, len=len):\n        'Make a new CacheInfo object from a sequence or iterable'\n        result = new(cls, iterable)\n        if len(result) != 4:\n            raise TypeError('Expected 4 arguments, got %d' % len(result))\n        return result\n\n    def _replace(_self, **kwds):\n        'Return a new CacheInfo object replacing specified fields with new values'\n        result = _self._make(map(kwds.pop, ('hits', 'misses', 'maxsize', 'currsize'), _self))\n        if kwds:\n            raise ValueError('Got unexpected field names: %r' % list(kwds))\n        return result\n\n    def __repr__(self):\n        'Return a nicely formatted representation string'\n        return self.__class__.__name__ + '(hits=%r, misses=%r, maxsize=%r, currsize=%r)' % self\n\n    def _asdict(self):\n        'Return a new OrderedDict which maps field names to their values.'\n        return OrderedDict(zip(self._fields, self))\n\n    def __getnewargs__(self):\n        'Return self as a plain tuple.  Used by copy and pickle.'\n        return tuple(self)\n\n    hits = _property(_itemgetter(0), doc='Alias for field number 0')\n\n    misses = _property(_itemgetter(1), doc='Alias for field number 1')\n\n    maxsize = _property(_itemgetter(2), doc='Alias for field number 2')\n\n    currsize = _property(_itemgetter(3), doc='Alias for field number 3')\n\n"
diff -r 20bb8babc505 Makefile.pre.in
--- a/Makefile.pre.in	Wed Nov 30 12:10:54 2016 +0100
+++ b/Makefile.pre.in	Thu Dec 01 16:05:51 2016 +0200
@@ -471,7 +471,7 @@ DTRACE_DEPS = \
 
 # Default target
 all:		@DEF_MAKE_ALL_RULE@
-build_all:	$(BUILDPYTHON) oldsharedmods sharedmods gdbhooks Programs/_testembed python-config
+build_all:	$(BUILDPYTHON) oldsharedmods sharedmods gdbhooks Programs/_testembed python-config $(srcdir)/Lib/functools_CacheInfo.py
 
 # Compile a binary with profile guided optimization.
 profile-opt:
@@ -563,6 +563,15 @@ coverage-report:
 clinic: $(BUILDPYTHON) $(srcdir)/Modules/_blake2/blake2s_impl.c
 	$(RUNSHARED) $(PYTHON_FOR_BUILD) ./Tools/clinic/clinic.py --make
 
+$(srcdir)/Lib/functools_CacheInfo.py: $(BUILDPYTHON) $(srcdir)/Lib/collections/__init__.py
+	$(RUNSHARED) $(PYTHON_FOR_BUILD) -c '\
+	from collections import namedtuple;\
+	CacheInfo = namedtuple("CacheInfo", ["hits", "misses", "maxsize", "currsize"]);\
+	print(CacheInfo._source);\
+	print("CacheInfo.__module__ = %r" % "functools");\
+	print("CacheInfo._source = %r" % CacheInfo._source);\
+	' >$(srcdir)/Lib/functools_CacheInfo.py
+
 # Build the interpreter
 $(BUILDPYTHON):	Programs/python.o $(LIBRARY) $(LDLIBRARY) $(PY3LIBRARY)
 	$(LINKCC) $(PY_LDFLAGS) $(LINKFORSHARED) -o $@ Programs/python.o $(BLDLIBRARY) $(LIBS) $(MODLIBS) $(SYSLIBS) $(LDLAST)