1 files changed, 3 insertions, 0 deletions
diff --git a/src/upb.h b/src/upb.h
index cc09ab1..092ea66 100644
--- a/src/upb.h
+++ b/src/upb.h
@@ -223,6 +223,9 @@ union upb_symbol_ref {
   struct upb_msgdef *msg;
   struct upb_enumdef *_enum;
   struct upb_svc *svc;
+
+  /* Used only temporarily before a reference has been resolved. */
+  struct upb_string *str;
 };
 
 // Status codes used as a return value.  Codes >0 are not fatal and can be