1 files changed, 3 insertions, 0 deletions
diff --git a/db/ops/update.h b/db/ops/update.h
index de5805a..73e4437 100644
--- a/db/ops/update.h
+++ b/db/ops/update.h
@@ -623,6 +623,9 @@ namespace mongo {
 
         }
 
+        /** @return true iff the elements aren't eoo(), are distinct, and share a field name. */
+        static bool duplicateFieldName( const BSONElement &a, const BSONElement &b );
+
     public:
 
         bool canApplyInPlace() const {