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diff --git a/clang/test/SemaCXX/vector-no-lax.cpp b/clang/test/SemaCXX/vector-no-lax.cpp
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+++ b/clang/test/SemaCXX/vector-no-lax.cpp
@@ -0,0 +1,9 @@
+// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -fsyntax-only -fno-lax-vector-conversions -verify %s
+typedef unsigned int __attribute__((vector_size (16))) vUInt32;
+typedef int __attribute__((vector_size (16))) vSInt32;
+
+vSInt32 foo (vUInt32 a) {
+  vSInt32 b = { 0, 0, 0, 0 };
+  b += a; // expected-error{{can't convert between vector values}}
+  return b;
+}