Index: src/CodeGen/CodeGenerator.cc
===================================================================
--- src/CodeGen/CodeGenerator.cc	(revision 054514d366b6a7a6863d673a9c760baa03661f21)
+++ src/CodeGen/CodeGenerator.cc	(revision 61d9b4b1665e2ecc616141fbd84baeba38a14dcb)
@@ -836,4 +836,9 @@
 		assertf( ! genC, "Deleted expressions should not reach code generation." );
 		expr->expr->accept( *visitor );
+	}
+
+	void CodeGenerator::postvisit( DefaultArgExpr * arg ) {
+		assertf( ! genC, "Default argument expressions should not reach code generation." );
+		arg->expr->accept( *visitor );
 	}
 
Index: src/CodeGen/CodeGenerator.h
===================================================================
--- src/CodeGen/CodeGenerator.h	(revision 054514d366b6a7a6863d673a9c760baa03661f21)
+++ src/CodeGen/CodeGenerator.h	(revision 61d9b4b1665e2ecc616141fbd84baeba38a14dcb)
@@ -94,4 +94,5 @@
 		void postvisit( ConstructorExpr * );
 		void postvisit( DeletedExpr * );
+		void postvisit( DefaultArgExpr * );
 		void postvisit( GenericExpr * );