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CI unit test failure: "xunit produced no error output but had exit code 255" #19911

@tmat

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@tmat

https://ci.dot.net/job/dotnet_roslyn/job/master/job/windows_debug_unit32_prtest/6949/console

16:45:29   Errors Roslyn.Services.Editor.VisualBasic.UnitTests.dll: 
16:45:29   
16:45:29   Command: C:\Users\dotnet-bot/.nuget/packages/\xunit.runner.console\2.2.0-beta4-build3444\tools\xunit.console.x86.exe "D:\j\workspace\windows_debug---09a07fba\Binaries\Debug\UnitTests\BasicEditorServicesTest\Roslyn.Services.Editor.VisualBasic.UnitTests.dll" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Completion.CompletionProviders.TypeContextTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Completion.CompletionServiceTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.ConflictMarkerResolution.ConflictMarkerResolutionTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.ConvertToInterpolatedString.ConvertConcatenationToInterpolatedStringTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.ConvertToInterpolatedString.ConvertPlaceholderToInterpolatedStringTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.Async.AddAwaitTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.Async.ChangeToAsyncTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.CorrectNextControlVariable.CorrectNextControlVariableTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.ExitContinue.ExitContinueCodeActionTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.FullyQualify.FixIncorrectFunctionReturnTypeTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.FullyQualify.FullyQualifyTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.FullyQualify.FullyQualifyTests+AddImportTestsWithAddImportDiagnosticProvider" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.GenerateEndConstruct.GenerateEndConstructTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.GenerateEnumMember.GenerateEnumMemberTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.GenerateEvent.GenerateEventTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.GenerateMethod.GenerateMethodTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.GenerateMethod.GenerateMethodTests+GenerateConversionTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.GenerateType.GenerateTypeTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.GenerateType.GenerateTypeTests+AddImportTestsWithAddImportDiagnosticProvider" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.GenerateVariable.GenerateVariableTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.InsertMissingCast.InsertMissingCastTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.MakeMethodAsynchronous.MakeMethodAsynchronousTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.MakeMethodSynchronous.MakeMethodSynchronousTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.MoveToTopOfFile.MoveToTopOfFileTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.PopulateSwitch.PopulateSwitchTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.PreferFrameworkTypeTests.PreferFrameworkTypeTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.RemoveUnnecessaryCast.RemoveUnnecessaryCastTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.RemoveUnusedVariableTest.RemoveUnusedVariableTest" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.SimplifyTypeNames.SimplifyTypeNamesTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.Spellcheck.SpellCheckTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.Spellcheck.SpellCheckTests+AddImportTestsWithAddImportDiagnosticProvider" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.Suppression.VisualBasicSuppressionAllCodeTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.Suppression.VisualBasicSuppressionTests+VisualBasicGlobalSuppressMessageSuppressionTests+CompilerDiagnosticSuppressionTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.Suppression.VisualBasicSuppressionTests+VisualBasicGlobalSuppressMessageSuppressionTests+UserHiddenDiagnosticSuppressionTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.Suppression.VisualBasicSuppressionTests+VisualBasicGlobalSuppressMessageSuppressionTests+UserInfoDiagnosticSuppressionTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.Suppression.VisualBasicSuppressionTests+VisualBasicGlobalSuppressMessageSuppressionTests+UserInfoDiagnosticSuppressionTests+UserDiagnosticAnalyzer" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.Suppression.VisualBasicSuppressionTests+VisualBasicPragmaWarningDisableSuppressionTests+CompilerDiagnosticSuppressionTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.Suppression.VisualBasicSuppressionTests+VisualBasicPragmaWarningDisableSuppressionTests+DiagnosticWithBadIdSuppressionTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.Suppression.VisualBasicSuppressionTests+VisualBasicPragmaWarningDisableSuppressionTests+DiagnosticWithBadIdSuppressionTests+UserDiagnosticAnalyzer" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.Suppression.VisualBasicSuppressionTests+VisualBasicPragmaWarningDisableSuppressionTests+UserErrorDiagnosticSuppressionTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.Suppression.VisualBasicSuppressionTests+VisualBasicPragmaWarningDisableSuppressionTests+UserErrorDiagnosticSuppressionTests+UserDiagnosticAnalyzer" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.Suppression.VisualBasicSuppressionTests+VisualBasicPragmaWarningDisableSuppressionTests+UserHiddenDiagnosticSuppressionTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.Suppression.VisualBasicSuppressionTests+VisualBasicPragmaWarningDisableSuppressionTests+UserInfoDiagnosticSuppressionTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.Suppression.VisualBasicSuppressionTests+VisualBasicPragmaWarningDisableSuppressionTests+UserInfoDiagnosticSuppressionTests+UserDiagnosticAnalyzer" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.Suppression.VisualBasicSuppressionTests+VisualBasicPragmaWarningDisableSuppressionTests+UserWarningDiagnosticWithNameMatchingKeywordSuppressionTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.Suppression.VisualBasicSuppressionTests+VisualBasicPragmaWarningDisableSuppressionTests+UserWarningDiagnosticWithNameMatchingKeywordSuppressionTests+UserDiagnosticAnalyzer" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.UseAutoProperty.UseAutoPropertyTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.UseCollectionInitializer.UseCollectionInitializerTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Diagnostics.UseObjectInitializer.UseObjectInitializerTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.DocumentationComments.CodeFixes.RemoveDocCommentNodeCodeFixProviderTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.DocumentationComments.DocumentationCommentTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.DocumentationComments.XmlTagCompletionTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EditAndContinue.SyntaxUtilitiesTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EncapsulateField.EncapsulateFieldCommandHandlerTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EndConstructGeneration.CharacterTypingTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EndConstructGeneration.CustomEventTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EndConstructGeneration.DoLoopTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EndConstructGeneration.EndConstructCommandHandlerTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EndConstructGeneration.ForLoopTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EndConstructGeneration.IfBlockTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EndConstructGeneration.ITextSnapshotExtensionsTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EndConstructGeneration.MethodBlockTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EndConstructGeneration.MiscellaneousTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EndConstructGeneration.MultiLineLambdaTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EndConstructGeneration.NamespaceBlockTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EndConstructGeneration.PreprocessorIfTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EndConstructGeneration.PreprocessorRegionTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EndConstructGeneration.PropertyBlockTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EndConstructGeneration.SelectBlockTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EndConstructGeneration.SyncLockBlockTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EndConstructGeneration.TryBlockTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EndConstructGeneration.TypeBlockTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EndConstructGeneration.UsingBlockTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EndConstructGeneration.WhileLoopTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EndConstructGeneration.WhiteSpacesInsertTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EndConstructGeneration.WithBlockTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.EndConstructGeneration.XmlLiteralTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.Extensions.StatementSyntaxExtensionTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.ExtractInterface.ExtractInterfaceTests" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.ExtractMethod.ExtractMethodTests+DataFlowPass" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.ExtractMethod.ExtractMethodTests+FlowAnalysis" -class "Microsoft.CodeAnalysis.Editor.VisualBasic.UnitTests.ExtractMethod.ExtractMethodTests+LanguageInteraction"  -xml "D:\j\workspace\windows_debug---09a07fba\Binaries\Debug\UnitTests\BasicEditorServicesTest\xUnitResults\Roslyn.Services.Editor.VisualBasic.UnitTests.dll.2.xml" -noshadow -verbose
16:45:29   xUnit output log: D:\j\workspace\windows_debug---09a07fba\Binaries\Debug\UnitTests\BasicEditorServicesTest\xUnitResults\Roslyn.Services.Editor.VisualBasic.UnitTests.dll.2.out.log
16:45:29 
  xunit produced no error output but had exit code 255

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