Index: undo_old.c
===================================================================
--- undo_old.c	(revision 21409)
+++ undo_old.c	(revision 21410)
@@ -993,7 +993,7 @@
 			if (subc != NULL)
 				r->p_subc_id = subc->ID;
 			break;
-#warning subc TODO: floater subc in subc should remember its subc parent too
+TODO("subc: floater subc in subc should remember its subc parent too")
 		default:
 			break;
 	}