1 files changed, 7 insertions, 0 deletions
diff --git a/test/Sema/varargs.cpp b/test/Sema/varargs.cpp
new file mode 100644
index 0000000..48a7b2f
--- /dev/null
+++ b/test/Sema/varargs.cpp
@@ -0,0 +1,7 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+class string;
+void f(const string& s, ...) {  // expected-note {{parameter of type 'const string &' is declared here}}
+  __builtin_va_list ap;
+  __builtin_va_start(ap, s); // expected-warning {{'va_start' has undefined behavior with reference types}}
+}