1 files changed, 23 insertions, 0 deletions
diff --git a/deps/v8/test/mjsunit/regress/regress-1005400.js b/deps/v8/test/mjsunit/regress/regress-1005400.js
new file mode 100644
index 0000000000..77234235fe
--- /dev/null
+++ b/deps/v8/test/mjsunit/regress/regress-1005400.js
@@ -0,0 +1,23 @@
+// Copyright 2019 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+function foo(a, key) {
+  a[key];
+}
+
+let obj = {};
+let count = 0;
+
+var key_obj = {
+  toString: function() {
+    count++;
+    // Force string to be internalized during keyed lookup.
+    return 'foo' + count;
+  }
+};
+
+foo(obj, key_obj);
+
+// We should only call toString once.
+assertEquals(count, 1);