Gold bar trying to show light bulb

[sharwell]

Version Used: 16.8 Preview 2

Steps to Reproduce:

Attempting to show light bulb

Expected Behavior:

Actual Behavior:

Gold bar appears with this stack trace:

System.ArgumentNullException: Value cannot be null.
Parameter name: node
   at Microsoft.CodeAnalysis.CSharp.CSharpSemanticModel.GetTypeInfoFromNode(SyntaxNode node, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.CSharp.CSharpSemanticModel.GetTypeInfoCore(SyntaxNode node, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.AddImport.AbstractAddImportFeatureService`1.GetCollectionExpressionType(SemanticModel semanticModel, ISyntaxFacts syntaxFactsService, SyntaxNode node)
   at Microsoft.CodeAnalysis.AddImport.AbstractAddImportFeatureService`1.SymbolReferenceFinder.<GetReferencesForGetEnumeratorAsync>d__32.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.AddImport.AbstractAddImportFeatureService`1.SymbolReferenceFinder.<DoAsync>d__17.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.AddImport.AbstractAddImportFeatureService`1.<FindResultsInAllSymbolsInStartingProjectAsync>d__23.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.AddImport.AbstractAddImportFeatureService`1.<FindResultsAsync>d__22.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.AddImport.AbstractAddImportFeatureService`1.<FindResultsAsync>d__20.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.AddImport.AbstractAddImportFeatureService`1.<GetFixesInCurrentProcessAsync>d__19.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.AddImport.AbstractAddImportFeatureService`1.<GetFixesAsync>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.Remote.CodeAnalysisService.<>c__DisplayClass2_0.<<GetFixesAsync>b__0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.Remote.ServiceBase.<RunServiceAsync>d__15`1.MoveNext()

[jcouv]

The ArgumentNullException occurs when GetTypeInfoFromNode/GetTypeInfoCore are given a null node.
Moving the issue to area IDE. The problem is likely in AddImport code.

[jinujoseph]

@ryzngard old issue , can you check if this repros if not pls close it

[sharwell]

Fixed by #48967