tree 066597a692b59eb046bce4a8b51c81906b053de6
parent 9d379d8c17c89d556f07b1942d4861fac8077a0c
author Nate Bosch <nbosch1@gmail.com> 1527813485 -0700
committer GitHub <noreply@github.com> 1527813485 -0700
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More Dart 2 runtime semantic fixes (#844)

```
type 'WebSocketChannel' is not a subtype of type 'StreamChannel<String>' of 'channel'
```

Cast the `WebSocketChannel` to indicate that all values in each
direction will be `String`.

```
type 'CloseGuaranteeChannel<dynamic>' is not a subtype of type 'VirtualChannel'
```

Avoid using the `suiteChannel` variable for two types. It needs to start
as a `VirtualChannel` which has the `id` field, and then later be a
`StreamChannel`.

```
type 'RunnerSuite' is not a subtype of type 'FutureOr<Future<RunnerSuite>>'
```

Avoid the attempted Future flattening which was never correct but was
supported in the Dart 1 VM.