Index: src/CodeGen/GenType.cc
===================================================================
--- src/CodeGen/GenType.cc	(revision 2a4b0884c14643e09650daaeb3a6667b5bff6b48)
+++ src/CodeGen/GenType.cc	(revision ac1ed49544d895d4dcb8bbfefe63cab57c0ca49a)
@@ -39,4 +39,5 @@
 		virtual void visit( EnumInstType *enumInst );
 		virtual void visit( TypeInstType *typeInst );
+		virtual void visit( VarArgsType *varArgsType );
   
 	  private:
@@ -191,4 +192,9 @@
 	}
 
+	void GenType::visit( VarArgsType *varArgsType ) {
+		typeString = "__builtin_va_list " + typeString;
+		// don't handle qualifiers, var args pack shouldn't have any
+	}
+
 	void GenType::handleQualifiers( Type *type ) {
 		if ( type->get_isConst() ) {