From 76236f0db2d6afe14c08393cef676f0f3939f7d8 Mon Sep 17 00:00:00 2001
From: Simon Charette <charette.s@gmail.com>
Date: Thu, 13 Jul 2017 02:51:24 -0400
Subject: [PATCH] Stopped setting BaseExpression.copied on copy().

Unused since its introduction in f59fd15c4928caf3dfcbd50f6ab47be409a43b01.
---
 django/db/models/expressions.py | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/django/db/models/expressions.py b/django/db/models/expressions.py
index e4c0e1307a..f43bd50c06 100644
--- a/django/db/models/expressions.py
+++ b/django/db/models/expressions.py
@@ -292,9 +292,7 @@ class BaseExpression:
         return clone
 
     def copy(self):
-        c = copy.copy(self)
-        c.copied = True
-        return c
+        return copy.copy(self)
 
     def get_group_by_cols(self):
         if not self.contains_aggregate: