1 files changed, 54 insertions, 0 deletions
diff --git a/js/src/tests/non262/destructuring/duplicate-__proto__.js b/js/src/tests/non262/destructuring/duplicate-__proto__.js
new file mode 100644
index 0000000000..a8f76014e9
--- /dev/null
+++ b/js/src/tests/non262/destructuring/duplicate-__proto__.js
@@ -0,0 +1,54 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+
+// Destructuring assignment.
+var a, b;
+({__proto__: a, __proto__: b} = {});
+assertEq(a, Object.prototype);
+assertEq(b, Object.prototype);
+
+// Destructuring binding with "var".
+var {__proto__: a, __proto__: b} = {};
+assertEq(a, Object.prototype);
+assertEq(b, Object.prototype);
+
+// Destructuring binding with "let".
+{
+    let {__proto__: a, __proto__: b} = {};
+    assertEq(a, Object.prototype);
+    assertEq(b, Object.prototype);
+}
+
+// Destructuring binding with "const".
+{
+    const {__proto__: a, __proto__: b} = {};
+    assertEq(a, Object.prototype);
+    assertEq(b, Object.prototype);
+}
+
+// Function parameters.
+function f1({__proto__: a, __proto__: b}) {
+    assertEq(a, Object.prototype);
+    assertEq(b, Object.prototype);
+}
+f1({});
+
+// Arrow function parameters.
+var f2 = ({__proto__: a, __proto__: b}) => {
+    assertEq(a, Object.prototype);
+    assertEq(b, Object.prototype);
+};
+f2({});
+
+// Arrow function parameters with defaults (initially parsed as destructuring assignment).
+var f3 = ({__proto__: a, __proto__: b} = {}) => {
+    assertEq(a, Object.prototype);
+    assertEq(b, Object.prototype);
+};
+f3({});
+
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0);