1 files changed, 37 insertions, 0 deletions
diff --git a/js/src/tests/ecma_6/Generators/delegating-yield-9.js b/js/src/tests/ecma_6/Generators/delegating-yield-9.js
new file mode 100644
index 000000000..60c35b94d
--- /dev/null
+++ b/js/src/tests/ecma_6/Generators/delegating-yield-9.js
@@ -0,0 +1,37 @@
+// Test that yield* can appear in a loop, and inside yield.
+
+function* countdown(n) {
+    while (n > 0) {
+        yield (yield* countdown(--n));
+    }
+    return 34;
+}
+
+function collect_results(iter) {
+    var ret = [];
+    var result;
+    do {
+        result = iter.next();
+        ret.push(result);
+    } while (!result.done);
+    return ret;
+}
+
+var expected = [
+    // Only 34 yielded from the "yield" and the last return make it out.
+    // Three yields in countdown(3), two in countdown(2), and one in
+    // countdown(1) (called twice).
+    {value: 34, done: false},
+    {value: 34, done: false},
+    {value: 34, done: false},
+    {value: 34, done: false},
+    {value: 34, done: false},
+    {value: 34, done: false},
+    {value: 34, done: false},
+    {value: 34, done: true}, // final
+];
+
+assertDeepEq(collect_results(countdown(3)), expected);
+
+if (typeof reportCompare == "function")
+    reportCompare(true, true);