Change which ExceptionEvents are triggered by Promises

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

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --allow-natives-syntax --harmony-async-await --expose-debug-as debug
 
 Debug = debug.Debug
 
 var exception = null;
 var log;
@@ skipping 69 matching lines @@
 // Caught reject, events on uncaught exception.
 log = [];
 Debug.setListener(listener);
 Debug.setBreakOnUncaughtException();
 caught_reject();
 %RunMicrotasks();
 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);