Made a small optimization to __deepcopy__ in [6276].

git-svn-id: http://code.djangoproject.com/svn/django/trunk@6279 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/utils/functional.py

@@ -1,5 +1,3 @@
-import copy
-
 def curry(_curried_func, *args, **kwargs):
     def _curried(*moreargs, **morekwargs):
         return _curried_func(*(args+moreargs), **dict(kwargs, **morekwargs))
@@ -104,9 +102,11 @@ def lazy(func, *resultclasses):
                 raise AssertionError('__mod__ not supported for non-string types')
 
         def __deepcopy__(self, memo):
-            result = copy.copy(self)
-            memo[id(self)] = result
-            return result
+            # Instances of this class are effectively immutable. It's just a
+            # collection of functions. So we don't need to do anything
+            # complicated for copying.
+            memo[id(self)] = self
+            return self
 
     def __wrapper__(*args, **kw):
         # Creates the proxy object, instead of the actual value.