Dart2js async-await. Propagate stacktraces from futures.

tests/compiler/dart2js_extra/async_stacktrace_test.dart

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import "dart:async";
+
+import "package:expect/expect.dart";
+import "package:async_helper/async_helper.dart";
+
+test1() async 
+              * /// asyncStar: ok
+                {
+  var savedStackTrace;
+  try {
+    try {
+      throw "Error";
+    } catch (e, st) {
+      savedStackTrace = st;
+    }
+    await new Future.error("Error 2", savedStackTrace);
+  } catch (e, st) {
+    Expect.equals(savedStackTrace.toString(), st.toString());

[floitsch, 2015/02/20 12:36:05]

Make sure this expect is reached. Same for the others.

[sigurdm, 2015/02/23 12:41:18]

Done.

+  }
+}
+
+test2() {
+  var savedStackTrace;
+  foo() async 
+              * /// asyncStar: continued
+               {
+    try {
+     // await 3;
+      throw "Error";
+    } catch (e, st) {
+      savedStackTrace = st;
+    }
+    await new Future.error("Error 2", savedStackTrace);
+  }
+  return foo()
+      .toList() /// asyncStar: continued
+      .catchError((e, st) {
+    Expect.equals(savedStackTrace.toString(), st.toString());
+  });
+}
+
+test3() {
+  var savedStackTrace;
+  foo() async 
+              * /// asyncStar: continued
+                {
+    try {
+      throw "Error";
+    } catch (e, st) {
+      savedStackTrace = st;
+      rethrow;
+    }
+  }
+  return foo()
+      .toList() /// asyncStar: continued
+      .catchError((e, st) {
+    Expect.equals(savedStackTrace.toString(), st.toString());
+  });
+}
+
+runTests() async {
+  await test1()
+      .toList() /// asyncStar: continued
+  ;
+  await test2()
+  ;

[floitsch, 2015/02/20 12:36:05]

move ";" to previous line.
Same for test3.

[sigurdm, 2015/02/23 12:41:17]

Done.

+  await test3()
+  ;
+}
+
+main() {
+  asyncTest(runTests);
+}