Index: src/Common/PassVisitor.h
===================================================================
--- src/Common/PassVisitor.h	(revision ee3c93d9425378dba13f5e7407f9097ac9d1cbb8)
+++ src/Common/PassVisitor.h	(revision 0f798534e5e22d73c97f4df465f395acdb91f398)
@@ -125,4 +125,5 @@
 	virtual void visit( InitExpr *  initExpr ) override final;
 	virtual void visit( DeletedExpr *  delExpr ) override final;
+	virtual void visit( DefaultArgExpr * argExpr ) override final;
 	virtual void visit( GenericExpr * genExpr ) override final;
 
@@ -224,4 +225,5 @@
 	virtual Expression * mutate( InitExpr *  initExpr ) override final;
 	virtual Expression * mutate( DeletedExpr *  delExpr ) override final;
+	virtual Expression * mutate( DefaultArgExpr * argExpr ) override final;
 	virtual Expression * mutate( GenericExpr * genExpr ) override final;
 
Index: src/Common/PassVisitor.impl.h
===================================================================
--- src/Common/PassVisitor.impl.h	(revision ee3c93d9425378dba13f5e7407f9097ac9d1cbb8)
+++ src/Common/PassVisitor.impl.h	(revision 0f798534e5e22d73c97f4df465f395acdb91f398)
@@ -2084,4 +2084,27 @@
 
 //--------------------------------------------------------------------------
+// DefaultArgExpr
+template< typename pass_type >
+void PassVisitor< pass_type >::visit( DefaultArgExpr * node ) {
+	VISIT_START( node );
+
+	indexerScopedAccept( node->result, *this );
+	maybeAccept_impl( node->expr, *this );
+
+	VISIT_END( node );
+}
+
+template< typename pass_type >
+Expression * PassVisitor< pass_type >::mutate( DefaultArgExpr * node ) {
+	MUTATE_START( node );
+
+	indexerScopedMutate( node->env, *this );
+	indexerScopedMutate( node->result, *this );
+	maybeMutate_impl( node->expr, *this );
+
+	MUTATE_END( Expression, node );
+}
+
+//--------------------------------------------------------------------------
 // GenericExpr
 template< typename pass_type >