1 files changed, 28 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/onEnterFrame-async-resumption-12.js b/js/src/jit-test/tests/debug/onEnterFrame-async-resumption-12.js
new file mode 100644
index 0000000000..28ad0c4c44
--- /dev/null
+++ b/js/src/jit-test/tests/debug/onEnterFrame-async-resumption-12.js
@@ -0,0 +1,28 @@
+// If the async function's promise is already resolved, any attempt to return
+// a differerent return value gets ignored.
+
+let g = newGlobal({newCompartment: true});
+g.eval(`
+    async function f() {
+        return "ok";
+    }
+`);
+
+let dbg = new Debugger(g);
+
+let hits = 0;
+dbg.onEnterFrame = frame => {
+    frame.onPop = () => {
+        hits += 1;
+
+        // Normal functions can override the return value, but async functions
+        // have already resolved their promise, so this return request will get
+        // ignored.
+        return {return: "FAIL"};
+    };
+};
+
+g.f().then(x => {
+    assertEq(hits, 1);
+    assertEq(x, "ok");
+});