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Fix an uncaught exception during dart startup #3640

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michaelhixson
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Here's an example of the error output from before this change:

Unhandled exception:
Bad state: Stream was already listened to
#0      _RawServerSocket.listen (dart:io-patch/socket_patch.dart:1106)
#1      new _ForwardingStreamSubscription (dart:async/stream_pipe.dart:123)
#2      _ForwardingStream._createSubscription (dart:async/stream_pipe.dart:91)
#3      _ForwardingStream.listen (dart:async/stream_pipe.dart:86)
#4      _ServerSocket.listen (dart:io-patch/socket_patch.dart:1351)
#5      _HttpServer.listen (dart:io/http_impl.dart:2278)
#6      _startServer.<anonymous closure> (file:///server.dart:88:12)
#7      _RootZone.runUnary (dart:async/zone.dart:1371)
#8      _FutureListener.handleValue (dart:async/future_impl.dart:129)
#9      _Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:636)
#10     _Future._propagateToListeners (dart:async/future_impl.dart:665)
#11     _Future._completeWithValue (dart:async/future_impl.dart:478)
#12     Future.wait.<anonymous closure> (dart:async/future.dart:362)
#13     _RootZone.runUnary (dart:async/zone.dart:1371)
#14     _FutureListener.handleValue (dart:async/future_impl.dart:129)
#15     _Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:636)
#16     _Future._propagateToListeners (dart:async/future_impl.dart:665)
#17     _Future._completeWithValue (dart:async/future_impl.dart:478)
#18     Future.wait.<anonymous closure> (dart:async/future.dart:362)
#19     _RootZone.runUnary (dart:async/zone.dart:1371)
#20     _FutureListener.handleValue (dart:async/future_impl.dart:129)
#21     _Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:636)
#22     _Future._propagateToListeners (dart:async/future_impl.dart:665)
#23     _Future._completeWithValue (dart:async/future_impl.dart:478)
#24     _Future._asyncComplete.<anonymous closure> (dart:async/future_impl.dart:510)
#25     _microtaskLoop (dart:async/schedule_microtask.dart:41)
#26     _startMicrotaskLoop (dart:async/schedule_microtask.dart:50)
#27     _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:99)
#28     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:152)

Here's an example of the error output from before this change:

Unhandled exception:
Bad state: Stream was already listened to
#0      _RawServerSocket.listen (dart:io-patch/socket_patch.dart:1106)
TechEmpower#1      new _ForwardingStreamSubscription (dart:async/stream_pipe.dart:123)
TechEmpower#2      _ForwardingStream._createSubscription (dart:async/stream_pipe.dart:91)
TechEmpower#3      _ForwardingStream.listen (dart:async/stream_pipe.dart:86)
TechEmpower#4      _ServerSocket.listen (dart:io-patch/socket_patch.dart:1351)
TechEmpower#5      _HttpServer.listen (dart:io/http_impl.dart:2278)
TechEmpower#6      _startServer.<anonymous closure> (file:///server.dart:88:12)
TechEmpower#7      _RootZone.runUnary (dart:async/zone.dart:1371)
TechEmpower#8      _FutureListener.handleValue (dart:async/future_impl.dart:129)
TechEmpower#9      _Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:636)
TechEmpower#10     _Future._propagateToListeners (dart:async/future_impl.dart:665)
TechEmpower#11     _Future._completeWithValue (dart:async/future_impl.dart:478)
TechEmpower#12     Future.wait.<anonymous closure> (dart:async/future.dart:362)
TechEmpower#13     _RootZone.runUnary (dart:async/zone.dart:1371)
TechEmpower#14     _FutureListener.handleValue (dart:async/future_impl.dart:129)
TechEmpower#15     _Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:636)
TechEmpower#16     _Future._propagateToListeners (dart:async/future_impl.dart:665)
TechEmpower#17     _Future._completeWithValue (dart:async/future_impl.dart:478)
TechEmpower#18     Future.wait.<anonymous closure> (dart:async/future.dart:362)
TechEmpower#19     _RootZone.runUnary (dart:async/zone.dart:1371)
TechEmpower#20     _FutureListener.handleValue (dart:async/future_impl.dart:129)
TechEmpower#21     _Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:636)
TechEmpower#22     _Future._propagateToListeners (dart:async/future_impl.dart:665)
TechEmpower#23     _Future._completeWithValue (dart:async/future_impl.dart:478)
TechEmpower#24     _Future._asyncComplete.<anonymous closure> (dart:async/future_impl.dart:510)
TechEmpower#25     _microtaskLoop (dart:async/schedule_microtask.dart:41)
TechEmpower#26     _startMicrotaskLoop (dart:async/schedule_microtask.dart:50)
TechEmpower#27     _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:99)
TechEmpower#28     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:152)
@NateBrady23 NateBrady23 merged commit 04dd98d into TechEmpower:master Apr 24, 2018
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