1 files changed, 44 insertions, 0 deletions
diff --git a/js/src/tests/ecma_6/Generators/delegating-yield-8.js b/js/src/tests/ecma_6/Generators/delegating-yield-8.js
new file mode 100644
index 000000000..c17d6ea26
--- /dev/null
+++ b/js/src/tests/ecma_6/Generators/delegating-yield-8.js
@@ -0,0 +1,44 @@
+// Test that yield* can appear in a loop, and alongside yield.
+
+function* countdown(n) {
+    while (n > 0) {
+        yield n;
+        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 = [
+    // yield in countdown(3), n == 3
+    {value: 3, done: false},
+    // yield in yield* countdown(2), n == 2
+    {value: 2, done: false},
+    // yield in nested yield* countdown(1), n == 1
+    {value: 1, done: false},
+    // countdown(0) yields no values
+    // second go-through of countdown(2) loop, n == 1
+    {value: 1, done: false},
+    // second go-through of countdown(3) loop, n == 2
+    {value: 2, done: false},
+    // yield in yield* countdown(1), n == 1
+    {value: 1, done: false},
+    // third go-through of countdown(3) loop, n == 1
+    {value: 1, done: false},
+    // done
+    {value: 34, done: true}
+];
+
+assertDeepEq(expected, collect_results(countdown(3)));
+
+if (typeof reportCompare == "function")
+    reportCompare(true, true);