Bug 963641 - Add a test for __proto__ in destructuring patterns as a shorthand. r=jorendorff

--HG--
extra : rebase_source : 9d9e5ede1195b7e879a8ca539c9af432c5f2b5d9

js/src/tests/ecma_5/extensions/destructuring-for-inof-__proto__.js

@@ -0,0 +1,85 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+var gTestfile = 'destructuring-for-inof-__proto__.js';
+var BUGNUMBER = 963641;
+var summary =
+  "__proto__ should work in destructuring patterns as the targets of " +
+  "for-in/for-of loops";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+function objectWithProtoProperty(v)
+{
+  var obj = {};
+  return Object.defineProperty(obj, "__proto__",
+                               {
+                                 enumerable: true,
+                                 configurable: true,
+                                 writable: true,
+                                 value: v
+                               });
+}
+
+function* objectWithProtoGenerator(v)
+{
+  yield objectWithProtoProperty(v);
+}
+
+function* identityGenerator(v)
+{
+  yield v;
+}
+
+for (var { __proto__: target } of objectWithProtoGenerator(null))
+  assertEq(target, null);
+
+for ({ __proto__: target } of objectWithProtoGenerator("aacchhorrt"))
+  assertEq(target, "aacchhorrt");
+
+for ({ __proto__: target } of identityGenerator(42))
+  assertEq(target, Number.prototype);
+
+for (var { __proto__: target } in { prop: "kneedle" })
+  assertEq(target, String.prototype);
+
+for ({ __proto__: target } in { prop: "snork" })
+  assertEq(target, String.prototype);
+
+for ({ __proto__: target } in { prop: "ohia" })
+  assertEq(target, String.prototype);
+
+function nested()
+{
+  for (var { __proto__: target } of objectWithProtoGenerator(null))
+    assertEq(target, null);
+
+  for ({ __proto__: target } of objectWithProtoGenerator("aacchhorrt"))
+    assertEq(target, "aacchhorrt");
+
+  for ({ __proto__: target } of identityGenerator(42))
+    assertEq(target, Number.prototype);
+
+  for (var { __proto__: target } in { prop: "kneedle" })
+    assertEq(target, String.prototype);
+
+  for ({ __proto__: target } in { prop: "snork" })
+    assertEq(target, String.prototype);
+
+  for ({ __proto__: target } in { prop: "ohia" })
+    assertEq(target, String.prototype);
+}
+nested();
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete");