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diff --git a/js/src/tests/ecma_6/Generators/delegating-yield-1.js b/js/src/tests/ecma_6/Generators/delegating-yield-1.js
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+// This file was written by Andy Wingo <wingo@igalia.com> and originally
+// contributed to V8 as generators-objects.js, available here:
+//
+// http://code.google.com/p/v8/source/browse/branches/bleeding_edge/test/mjsunit/harmony/generators-objects.js
+
+// Test that yield* re-yields received results without re-boxing.
+
+function results(results) {
+    var i = 0;
+    function next() {
+        return results[i++];
+    }
+    var iter = { next: next }
+    var ret = {};
+    ret[Symbol.iterator] = function () { return iter; }
+    return ret;
+}
+
+function* yield_results(expected) {
+    return yield* results(expected);
+}
+
+function collect_results(iterable) {
+    var ret = [];
+    var result;
+    var iter = iterable[Symbol.iterator]();
+    do {
+        result = iter.next();
+        ret.push(result);
+    } while (!result.done);
+    return ret;
+}
+
+// We have to put a full result for the end, because the return will re-box.
+var expected = [{value: 1}, {value: 34, done: true}];
+
+// Sanity check.
+assertDeepEq(expected, collect_results(results(expected)));
+assertDeepEq(expected, collect_results(yield_results(expected)));
+
+if (typeof reportCompare == "function")
+    reportCompare(true, true);