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diff --git a/deps/v8/test/intl/regress-9747.js b/deps/v8/test/intl/regress-9747.js
new file mode 100644
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+++ b/deps/v8/test/intl/regress-9747.js
@@ -0,0 +1,50 @@
+// 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.
+
+let lf = new Intl.ListFormat("en");
+
+// Test normal array
+assertDoesNotThrow(() => lf.format(['a','b','c']));
+assertThrows("lf.format(['a','b',3])",  TypeError, "Iterable yielded 3 which is not a string");
+
+// Test sparse array
+let sparse = ['a','b'];
+sparse[10] = 'c';
+assertThrows("lf.format(sparse)",  TypeError, "Iterable yielded undefined which is not a string");
+
+// Test iterable of all String
+let iterable_of_strings = {
+  [Symbol.iterator]() {
+    return this;
+  },
+  count: 0,
+  next() {
+    if (this.count++ < 4) {
+      return {done: false, value: String(this.count)};
+    }
+    return {done:true}
+  }
+};
+assertDoesNotThrow(() => lf.format(iterable_of_strings));
+
+// Test iterable of none String throw TypeError
+let iterable_of_strings_and_number = {
+  [Symbol.iterator]() {
+    return this;
+  },
+  count: 0,
+  next() {
+    this.count++;
+    if (this.count ==  3) {
+      return {done:false, value: 3};
+    }
+    if (this.count < 5) {
+      return {done: false, value: String(this.count)};
+    }
+    return {done:true}
+  }
+};
+assertThrows("lf.format(iterable_of_strings_and_number)",
+    TypeError, "Iterable yielded 3 which is not a string");
+assertEquals(3, iterable_of_strings_and_number.count);