1 files changed, 28 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Frame-older-generators-04.js b/js/src/jit-test/tests/debug/Frame-older-generators-04.js
new file mode 100644
index 0000000000..405e08bed5
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Frame-older-generators-04.js
@@ -0,0 +1,28 @@
+// Test that Debugger.Frame.prototype.older works on suspended async functions.
+
+load(libdir + "asserts.js");
+
+const g = newGlobal({ newCompartment: true });
+const dbg = new Debugger(g);
+
+g.eval(`
+async function f() {
+  await Promise.resolve();
+}
+`);
+
+let frame;
+dbg.onEnterFrame = f => {
+  frame = f;
+  dbg.onEnterFrame = undefined;
+};
+
+(async () => {
+  const promise = g.f();
+
+  assertEq(frame.older, null);
+
+  await promise;
+
+  assertThrowsInstanceOf(() => frame.older, Error);
+})();