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-rw-r--r--include/qapi/visitor-impl.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/qapi/visitor-impl.h b/include/qapi/visitor-impl.h
index 252206dc0d..98dc533d39 100644
--- a/include/qapi/visitor-impl.h
+++ b/include/qapi/visitor-impl.h
@@ -43,6 +43,10 @@ typedef enum VisitorType {
 
 struct Visitor
 {
+    /*
+     * Only input visitors may fail!
+     */
+
     /* Must be set to visit structs */
     void (*start_struct)(Visitor *v, const char *name, void **obj,
                          size_t size, Error **errp);