1 files changed, 34 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Frame-older-02.js b/js/src/jit-test/tests/debug/Frame-older-02.js
new file mode 100644
index 0000000000..c5f772e46c
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Frame-older-02.js
@@ -0,0 +1,34 @@
+// An explicit async stack should interrupt a Debugger.Frame chain.
+
+var g = newGlobal({ newCompartment: true });
+var dbg = new Debugger(g);
+let done = false;
+dbg.onDebuggerStatement = function (frame) {
+  // The frame has no "older" frame because the explicit async stack
+  // attached to the async function takes priority over the real
+  // parent frame that is tracked in the frame iterator.
+  assertEq(!!frame.older, false);
+
+  done = true;
+};
+
+g.eval(`
+let draining = false;
+async function run() {
+  await Promise.resolve();
+
+  // Make sure that the test is running within "drainJobQueue()".
+  assertEq(draining, true);
+  debugger;
+}
+
+(function main() {
+  run();
+
+  // Force resumption of the "run" function.
+  draining = true;
+  drainJobQueue();
+  draining = false;
+})();
+`);
+assertEq(done, true);