1 files changed, 45 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Frame-identity-06.js b/js/src/jit-test/tests/debug/Frame-identity-06.js
new file mode 100644
index 0000000000..04eb16b386
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Frame-identity-06.js
@@ -0,0 +1,45 @@
+// Debugger.Frames for async functions are not GC'd while they're suspended.
+// The awaited promise keeps the generator alive, via its reaction lists.
+
+var g = newGlobal({newCompartment: true});
+g.eval(`
+    // Create a few promises.
+    var promises = [], resolvers = [];
+    for (let i = 0; i < 3; i++)
+        promises.push(new Promise(r => { resolvers.push(r); }));
+
+    async function f() {
+        debugger;
+        for (let p of promises) {
+            await p;
+            debugger;
+        }
+    }
+`);
+var dbg = new Debugger(g);
+var hits = 0;
+dbg.onDebuggerStatement = function (frame) {
+    if (hits === 0)
+        frame.seen = true;
+    else
+        assertEq(frame.seen, true);
+    hits++;
+};
+
+let done = false;
+g.f().then(_ => { done = true; });
+gc();
+drainJobQueue();
+gc();
+
+// Resolve the promises one by one.
+for (let [i, resolve] of g.resolvers.entries()) {
+    assertEq(hits, 1 + i);
+    assertEq(done, false);
+    resolve("x");
+    gc();
+    drainJobQueue();
+    gc();
+}
+assertEq(hits, 1 + g.resolvers.length);
+assertEq(done, true);