1 files changed, 41 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/onEnterFrame-async-resumption-05.js b/js/src/jit-test/tests/debug/onEnterFrame-async-resumption-05.js
new file mode 100644
index 0000000000..a0d9887c80
--- /dev/null
+++ b/js/src/jit-test/tests/debug/onEnterFrame-async-resumption-05.js
@@ -0,0 +1,41 @@
+// A Debugger can't force-return from the first onEnterFrame for an async generator.
+
+ignoreUnhandledRejections();
+
+let g = newGlobal({newCompartment: true});
+g.eval(`async function* f(x) { await x; return "ponies"; }`);
+
+let dbg = new Debugger;
+let gw = dbg.addDebuggee(g);
+let log = "";
+let completion = undefined;
+let resumption = undefined;
+dbg.uncaughtExceptionHook = exc => {
+    log += "2";
+    assertEq(exc.message, "can't force return from a generator before the initial yield");
+    assertEq(exc.constructor, TypeError);
+    return undefined;  // Squelch the error and let the debuggee continue.
+};
+dbg.onEnterFrame = frame => {
+    if (frame.type == "call" && frame.callee.name === "f") {
+        frame.onPop = c => {
+            // We get here after the uncaughtExcpetionHook fires
+            // and the debuggee frame has run to the first await.
+            completion = c;
+            assertEq(completion.return.class, "AsyncGenerator");
+            assertEq(completion.return !== resumption.return, true);
+            log += "3";
+        };
+
+        // Try force-returning an actual object of the expected type.
+        dbg.onEnterFrame = undefined;  // don't recurse
+        resumption = frame.eval('f(0)');
+        assertEq(resumption.return.class, "AsyncGenerator");
+        log += "1";
+        return resumption;
+    }
+};
+
+let it = g.f(0);
+assertEq(log, "123");
+assertEq(gw.makeDebuggeeValue(it), completion.return);