Fix ALL the pub tests.

sdk/lib/async/future_impl.dart

 // Copyright (c) 2012, 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.
 
 // part of dart.async;
 
 deprecatedFutureValue(_FutureImpl future) =>
   future._isComplete ? future._resultOrListeners : null;
 
 
@@ skipping 91 matching lines @@
       return new Future<List>.immediate(const []);
     }
 
     Completer completer = new Completer<List>();
     int remaining = futures.length;
     List values = new List.fixedLength(futures.length);
 
     // As each future completes, put its value into the corresponding
     // position in the list of values.
     int i = 0;
+    bool completed = false;
     for (Future future in futures) {
       int pos = i++;
       future.then((Object value) {
         values[pos] = value;
         if (--remaining == 0) {
           completer.complete(values);
         }
-      });
-      future.catchError((error) {
-        completer.completeError(error.error, error.stackTrace);
+      }).catchError((error) {
+        if (!completed) completer.completeError(error.error, error.stackTrace);
+        completed = true;
       });
     }
 
     return completer.future;
   }
 
   Future then(f(T value), { onError(AsyncError error) }) {
     if (!_isComplete) {
       if (onError == null) {
         return new _ThenFuture(f).._subscribeTo(this);
@@ skipping 321 matching lines @@
   Future catchError(function(AsyncError error), {bool test(var error)}) {
     return _future.catchError(function, test: test);
   }
 
   Future whenComplete(void action()) {
     return _future.whenComplete(action);
   }
 
   Stream<T> asStream() => new Stream.fromFuture(this);
 }