Issue #18037: 2to3 now escapes '\u' and '\U' in native strings.
diff --git a/Misc/NEWS b/Misc/NEWS
index feb3f08..9aad84f 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -32,6 +32,8 @@
 Library
 -------
 
+- Issue #18037: 2to3 now escapes '\u' and '\U' in native strings.
+
 - Issue #19137: The pprint module now correctly formats empty set and frozenset
   and instances of set and frozenset subclasses.