1 files changed, 7 insertions, 0 deletions
diff --git a/js/src/frontend/FullParseHandler.h b/js/src/frontend/FullParseHandler.h
index add881900a..0fd1377962 100644
--- a/js/src/frontend/FullParseHandler.h
+++ b/js/src/frontend/FullParseHandler.h
@@ -665,6 +665,11 @@ class FullParseHandler
                                                                    ParseNode* pn);
     inline void setLastFunctionFormalParameterDestructuring(ParseNode* funcpn, ParseNode* pn);
 
+    void checkAndSetIsDirectRHSAnonFunction(ParseNode* pn) {
+        if (IsAnonymousFunctionDefinition(pn))
+            pn->setDirectRHSAnonFunction(true);
+    }
+
     ParseNode* newFunctionDefinition() {
         return new_<CodeNode>(PNK_FUNCTION, pos());
     }
@@ -942,6 +947,8 @@ FullParseHandler::setLastFunctionFormalParameterDefault(ParseNode* funcpn, Parse
     if (!pn)
         return false;
 
+    checkAndSetIsDirectRHSAnonFunction(defaultValue);
+
     funcpn->pn_body->pn_pos.end = pn->pn_pos.end;
     ParseNode* pnchild = funcpn->pn_body->pn_head;
     ParseNode* pnlast = funcpn->pn_body->last();