Index: Doc/library/functools.rst
===================================================================
--- Doc/library/functools.rst	(revision 82038)
+++ Doc/library/functools.rst	(working copy)
@@ -111,9 +111,9 @@
    attributes of the wrapper function are updated with the corresponding attributes
    from the original function. The default values for these arguments are the
    module level constants *WRAPPER_ASSIGNMENTS* (which assigns to the wrapper
-   function's *__name__*, *__module__* and *__doc__*, the documentation string) and
-   *WRAPPER_UPDATES* (which updates the wrapper function's *__dict__*, i.e. the
-   instance dictionary).
+   function's *__name__*, *__module__*, *__annotations__* and *__doc__*, the 
+   documentation string) and *WRAPPER_UPDATES* (which updates the wrapper 
+   function's *__dict__*, i.e. the instance dictionary).
 
    The main intended use for this function is in :term:`decorator` functions which
    wrap the decorated function and return the wrapper. If the wrapper function is
Index: Lib/test/test_functools.py
===================================================================
--- Lib/test/test_functools.py	(revision 82038)
+++ Lib/test/test_functools.py	(working copy)
@@ -181,11 +181,11 @@
                 self.assertTrue(wrapped_attr[key] is wrapper_attr[key])
 
     def _default_update(self):
-        def f():
+        def f(a:'This is a new annotation'):
             """This is a test"""
             pass
         f.attr = 'This is also a test'
-        def wrapper():
+        def wrapper(b:'This is the prior annotation'):
             pass
         functools.update_wrapper(wrapper, f)
         return wrapper, f
@@ -195,6 +195,8 @@
         self.check_wrapper(wrapper, f)
         self.assertEqual(wrapper.__name__, 'f')
         self.assertEqual(wrapper.attr, 'This is also a test')
+        self.assertEqual(wrapper.__annotations__['a'], 'This is a new annotation')
+        self.assertNotIn('b', wrapper.__annotations__)
 
     @unittest.skipIf(sys.flags.optimize >= 2,
                      "Docstrings are omitted with -O2 and above")
@@ -213,6 +215,7 @@
         self.check_wrapper(wrapper, f, (), ())
         self.assertEqual(wrapper.__name__, 'wrapper')
         self.assertEqual(wrapper.__doc__, None)
+        self.assertEqual(wrapper.__annotations__, {})
         self.assertFalse(hasattr(wrapper, 'attr'))
 
     def test_selective_update(self):
@@ -239,6 +242,7 @@
         functools.update_wrapper(wrapper, max)
         self.assertEqual(wrapper.__name__, 'max')
         self.assertTrue(wrapper.__doc__.startswith('max('))
+        self.assertEqual(wrapper.__annotations__, {})
 
 class TestWraps(TestUpdateWrapper):
 
Index: Lib/functools.py
===================================================================
--- Lib/functools.py	(revision 82038)
+++ Lib/functools.py	(working copy)
@@ -12,7 +12,7 @@
 # update_wrapper() and wraps() are tools to help write
 # wrapper functions that can handle naive introspection
 
-WRAPPER_ASSIGNMENTS = ('__module__', '__name__', '__doc__')
+WRAPPER_ASSIGNMENTS = ('__module__', '__name__', '__doc__', '__annotations__')
 WRAPPER_UPDATES = ('__dict__',)
 def update_wrapper(wrapper,
                    wrapped,
@@ -30,7 +30,8 @@
        function (defaults to functools.WRAPPER_UPDATES)
     """
     for attr in assigned:
-        setattr(wrapper, attr, getattr(wrapped, attr))
+        if hasattr(wrapped, attr):
+            setattr(wrapper, attr, getattr(wrapped, attr))
     for attr in updated:
         getattr(wrapper, attr).update(getattr(wrapped, attr, {}))
     # Return the wrapper so this can be used as a decorator via partial()