xUnit.net console test runner (64-bit .NET Core)
Copyright (C) 2014 Outercurve Foundation.

Discovering: System.IO.FileSystem.Tests
Discovered:  System.IO.FileSystem.Tests
Starting:    System.IO.FileSystem.Tests

Unhandled Exception: System.InvalidCastException: Unable to cast object of type 'System.Object' to type 'System.Collections.Generic.List`1[System.Object]'.
   at System.Threading.Tasks.Task.RunContinuations(Object continuationObject) in /home/vmjenkins/workspace/Dotnet/build_and_test/src/mscorlib/src/System/Threading/Tasks/Task.cs:line 3299
   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot) in /home/vmjenkins/workspace/Dotnet/build_and_test/src/mscorlib/src/System/Threading/Tasks/Task.cs:line 2459
   at System.Threading.ThreadPoolWorkQueue.Dispatch() in /home/vmjenkins/workspace/Dotnet/build_and_test/src/mscorlib/src/System/Threading/ThreadPool.cs:line 586