1 files changed, 23 insertions, 0 deletions
diff --git a/test/Sema/error-type-safety.cpp b/test/Sema/error-type-safety.cpp
new file mode 100644
index 0000000000000..223645de0f713
--- /dev/null
+++ b/test/Sema/error-type-safety.cpp
@@ -0,0 +1,23 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+#define INT_TAG 42
+
+static const int test_in
+  __attribute__((type_tag_for_datatype(test, int))) = INT_TAG;
+
+// Argument index: 1, Type tag index: 2
+void test_bounds_index(...)
+  __attribute__((argument_with_type_tag(test, 1, 2)));
+
+// Argument index: 3, Type tag index: 1
+void test_bounds_arg_index(...)
+  __attribute__((argument_with_type_tag(test, 3, 1)));
+
+void test_bounds()
+{
+  // Test the boundary edges (ensure no off-by-one) with argument indexing.
+  test_bounds_index(1, INT_TAG);
+
+  test_bounds_index(1); // expected-error {{type tag index 2 is greater than the number of arguments specified}}
+  test_bounds_arg_index(INT_TAG, 1); // expected-error {{argument index 3 is greater than the number of arguments specified}}
+}