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-rw-r--r--django/db/backends/ddl_references.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/django/db/backends/ddl_references.py b/django/db/backends/ddl_references.py
index 412d07a993..75787ef8ab 100644
--- a/django/db/backends/ddl_references.py
+++ b/django/db/backends/ddl_references.py
@@ -2,6 +2,7 @@
Helpers to manipulate deferred DDL statements that might need to be adjusted or
discarded within when executing a migration.
"""
+
from copy import deepcopy