--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/PCH/chain-invalid-code.cpp	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,28 @@
+// RUN: %clang_cc1 -fsyntax-only %s -chain-include %s -Wuninitialized -Wunused -verify
+
+// Make sure there is no crash.
+
+#ifndef HEADER
+#define HEADER
+
+#include "non-existent-header.h"
+
+class A {
+public:
+  ~A();
+};
+
+class ForwardCls;
+struct B {
+  ForwardCls f;
+  A a;
+};
+
+#else
+
+static void test() {
+  int x; // expected-warning {{unused}}
+  B b;
+}
+
+#endif