1 files changed, 14 insertions, 0 deletions
diff --git a/libcxx/test/strings/basic.string/string.modifiers/string_insert/iter_iter_iter.pass.cpp b/libcxx/test/strings/basic.string/string.modifiers/string_insert/iter_iter_iter.pass.cpp
index 0eb3216e0d5c..ec915984439f 100644
--- a/libcxx/test/strings/basic.string/string.modifiers/string_insert/iter_iter_iter.pass.cpp
+++ b/libcxx/test/strings/basic.string/string.modifiers/string_insert/iter_iter_iter.pass.cpp
@@ -12,6 +12,10 @@
 // template<class InputIterator>
 //   iterator insert(const_iterator p, InputIterator first, InputIterator last);
 
+#if _LIBCPP_DEBUG2 >= 1
+#define _LIBCPP_ASSERT(x, m) ((x) ? (void)0 : std::exit(0))
+#endif
+
 #include <string>
 #include <cassert>
 
@@ -123,4 +127,14 @@ int main()
          S("12345678901234567890ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"));
     }
 #endif
+#if _LIBCPP_DEBUG2 >= 1
+    {
+        std::string v;
+        std::string v2;
+        char a[] = "123";
+        const int N = sizeof(a)/sizeof(a[0]);
+        std::string::iterator i = v.insert(v2.cbegin() + 10, a, a+N);
+        assert(false);
+    }
+#endif
 }