dart-lang/async: Fix types in typed_wrapper/stream_test.dart

Fix types in typed_wrapper/stream_test.dart

With Dart version 1.25.0-dev.10.0, some conversions from
Stream<Object> to TypeSafeStream<int> are failing.
Changed some Stream<Object> to Stream<int>.

If this is not the intent of the test, and the conversion should
succeed, it needs to be fixed in the library.

BUG=https://github.com/dart-lang/async/issues/35

[Bill Hesse, 2017-08-11 08:50:30]

whesse@google.com changed reviewers:
+ lrn@google.com, nweiz@google.com

[Bill Hesse, 2017-08-11 08:50:49]

Description was changed from

==========
Fix types in typed_wrapper/stream_test.dart

With Dart version 1.25.0-dev.10.0, some conversions from
Stream<Object> to TypeSafeStream<int> are failing.
Changed some Stream<Object> to Stream<int>.

If this is not the intent of the test, and the conversion should
succeed, it needs to be fixed in the library.

BUG=https://github.com/dart-lang/async/issues/35
==========

to

==========
Fix types in typed_wrapper/stream_test.dart

With Dart version 1.25.0-dev.10.0, some conversions from
Stream<Object> to TypeSafeStream<int> are failing.
Changed some Stream<Object> to Stream<int>.

If this is not the intent of the test, and the conversion should
succeed, it needs to be fixed in the library.

BUG=https://github.com/dart-lang/async/issues/35
==========

[Lasse Reichstein Nielsen, 2017-08-17 09:32:08]

I believe this is a bug in the library (or test) then.

The typed wrapper is intended to work on streams that isn't known to have the
correct type, but where the values actually has the type anyway.

[Bill Hesse, 2017-09-19 14:28:21]

On 2017/08/17 09:32:08, Lasse Reichstein Nielsen wrote:
> I believe this is a bug in the library (or test) then.
> 
> The typed wrapper is intended to work on streams that isn't known to have the
> correct type, but where the values actually has the type anyway.

Please comment on this nweitz.  We need to know what to do.

[nweiz, 2017-09-20 22:28:08]

On 2017/09/19 14:28:21, Bill Hesse wrote:
> On 2017/08/17 09:32:08, Lasse Reichstein Nielsen wrote:
> > I believe this is a bug in the library (or test) then.
> > 
> > The typed wrapper is intended to work on streams that isn't known to have
the
> > correct type, but where the values actually has the type anyway.
> 
> Please comment on this nweitz.  We need to know what to do.

Lasse is correct. The purpose of the typed wrapper is to wrap streams with
statically-incorrect but dynamically-correct types.

What errors are you seeing with the wrapping?

[Bill Hesse, 2017-09-20 22:45:52]

On 2017/09/20 22:28:08, nweiz wrote:
> On 2017/09/19 14:28:21, Bill Hesse wrote:
> > On 2017/08/17 09:32:08, Lasse Reichstein Nielsen wrote:
> > > I believe this is a bug in the library (or test) then.
> > > 
> > > The typed wrapper is intended to work on streams that isn't known to have
> the
> > > correct type, but where the values actually has the type anyway.
> > 
> > Please comment on this nweitz.  We need to know what to do.
> 
> Lasse is correct. The purpose of the typed wrapper is to wrap streams with
> statically-incorrect but dynamically-correct types.
> 
> What errors are you seeing with the wrapping?

There is an issue filed about this failure:
https://github.com/dart-lang/async/issues/35

The package water bots testing async now can't even run pub get on the package,
but before that, the unit tests were having failures, which should reproduce
just by running them locally now, all similar to:

01:05 +833 -9: [VM] test/typed_wrapper/stream_test.dart: with valid types,
forwards where() [E]
  type 'List<Object>' is not a subtype of type 'List<int>' of 'function result'
where
    List is from dart:core
    Object is from dart:core
    Object is from dart:core
    Object is from dart:core
    List is from dart:core
    int is from dart:core
  
  package:async/src/typed/stream.dart 104:7   TypeSafeStream.toList
  test/typed_wrapper/stream_test.dart 297:44  main.<fn>.<fn>
  ===== asynchronous gap ===========================
  dart:async                                  _Completer.completeError
  package:async/src/typed/stream.dart 104:54  TypeSafeStream.toList
  ===== asynchronous gap ===========================
  dart:async                                  _asyncThenWrapperHelper
  package:async/src/typed/stream.dart 103:34  TypeSafeStream.toList
  test/typed_wrapper/stream_test.dart 297:44  main.<fn>.<fn>


The errors on the package bots, like
https://luci-milo.appspot.com/buildbot/client.dart.packages/packages-linux-as...,
should be investigated and fixed.  They should all reproduce in a local checkout
of the package, pub get, and pub run test.

[nweiz, 2017-09-21 00:29:28]

I'm following up on the GitHub issue.