--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/PCH/chain-ext_vector.c	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,11 @@
+// Test this without pch.
+// RUN: %clang_cc1 -include %S/Inputs/chain-ext_vector1.h -include %S/Inputs/chain-ext_vector2.h -fsyntax-only -verify %s
+
+// Test with pch.
+// RUN: %clang_cc1 -emit-pch -o %t1 %S/Inputs/chain-ext_vector1.h
+// RUN: %clang_cc1 -emit-pch -o %t2 %S/Inputs/chain-ext_vector2.h -include-pch %t1
+// RUN: %clang_cc1 -include-pch %t2 -fsyntax-only -verify %s
+
+int test(float4 f4) {
+  return f4.xy; // expected-error{{float2}}
+}