Change which ExceptionEvents are triggered by Promises

test/mjsunit/harmony/async-debug-caught-exception.js

Index: test/mjsunit/harmony/async-debug-caught-exception.js
diff --git a/test/mjsunit/harmony/async-debug-caught-exception.js b/test/mjsunit/harmony/async-debug-caught-exception.js
index b2ae18437d7c6860355da3aae93bd376eb59bd6b..b2ceeb99589c4128e2f8182d0f5a0a0ab83d0683 100644
--- a/test/mjsunit/harmony/async-debug-caught-exception.js
+++ b/test/mjsunit/harmony/async-debug-caught-exception.js
@@ -87,3 +87,37 @@ Debug.setListener(null);
 Debug.clearBreakOnUncaughtException();
 assertEquals([], log);
 assertNull(exception);
+
+log = [];
+Debug.setListener(listener);
+Debug.setBreakOnException();
+
+// "rethrown" uncaught exceptions in return don't cause another event
+async function propagate_inner() { return thrower(); }
+async function propagate_outer() { return propagate_inner(); }
+
+propagate_outer();
+%RunMicrotasks();
+assertEquals(["a"], log);
+assertNull(exception);
+
+// Also don't propagate if an await interceded
+log = [];
+async function propagate_await() { await 1; return thrower(); }
+async function propagate_await_outer() { return propagate_await(); }
+propagate_await_outer();
+%RunMicrotasks();
+assertEquals(["a"], log);
+assertNull(exception);
+
+Debug.clearBreakOnException();
+Debug.setBreakOnUncaughtException();
+
+log = [];
+Promise.resolve().then(() => Promise.reject()).catch(() => log.push("d")); // Exception c
+%RunMicrotasks();
+assertEquals(["d"], log);
+assertNull(exception);
+
+Debug.clearBreakOnUncaughtException();
+Debug.setListener(null);