1 // RUN: %clang_cc1 -fsyntax-only -verify %s 2 3 class string; 4 void f(const string& s, ...) { // expected-note {{parameter of type 'const string &' is declared here}} 5 __builtin_va_list ap; 6 __builtin_va_start(ap, s); // expected-warning {{'va_start' has undefined behavior with reference types}} 7 } 8