Exception

[ArchieCoder]

VS 17.9.5

System.InvalidCastException : Unable to cast object of type 'Microsoft.CodeAnalysis.CSharp.Syntax.EventFieldDeclarationSyntax' to type 'Microsoft.CodeAnalysis.CSharp.Syntax.VariableDeclaratorSyntax'.
at System.Linq.Enumerable.d__971.MoveNext() at System.Collections.Generic.List1..ctor(IEnumerable1 collection) at System.Linq.Enumerable.ToList[TSource](IEnumerable1 source)
at Microsoft.CodeAnalysis.SeparatedSyntaxList1.ReplaceRange(TNode nodeInList,IEnumerable1 newNodes)
at Microsoft.CodeAnalysis.CSharp.Syntax.SyntaxReplacer.NodeListEditor.VisitList[TNode](SeparatedSyntaxList1 list) at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.VisitVariableDeclaration(VariableDeclarationSyntax node) at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.Visit(SyntaxNode node) at Microsoft.CodeAnalysis.CSharp.Syntax.SyntaxReplacer.BaseListEditor.Visit(SyntaxNode node) at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.VisitEventFieldDeclaration(EventFieldDeclarationSyntax node) at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.Visit(SyntaxNode node) at Microsoft.CodeAnalysis.CSharp.Syntax.SyntaxReplacer.BaseListEditor.Visit(SyntaxNode node) at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.VisitListElement[TNode](TNode node) at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.VisitList[TNode](SyntaxList1 list)
at Microsoft.CodeAnalysis.CSharp.Syntax.SyntaxReplacer.NodeListEditor.VisitList[TNode](SyntaxList1 list) at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.VisitClassDeclaration(ClassDeclarationSyntax node) at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.Visit(SyntaxNode node) at Microsoft.CodeAnalysis.CSharp.Syntax.SyntaxReplacer.BaseListEditor.Visit(SyntaxNode node) at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.VisitListElement[TNode](TNode node) at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.VisitList[TNode](SyntaxList1 list)
at Microsoft.CodeAnalysis.CSharp.Syntax.SyntaxReplacer.NodeListEditor.VisitList[TNode](SyntaxList1 list) at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.VisitNamespaceDeclaration(NamespaceDeclarationSyntax node) at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.Visit(SyntaxNode node) at Microsoft.CodeAnalysis.CSharp.Syntax.SyntaxReplacer.BaseListEditor.Visit(SyntaxNode node) at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.VisitListElement[TNode](TNode node) at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.VisitList[TNode](SyntaxList1 list)
at Microsoft.CodeAnalysis.CSharp.Syntax.SyntaxReplacer.NodeListEditor.VisitList[TNode](SyntaxList1 list) at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.VisitCompilationUnit(CompilationUnitSyntax node) at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.Visit(SyntaxNode node) at Microsoft.CodeAnalysis.CSharp.Syntax.SyntaxReplacer.BaseListEditor.Visit(SyntaxNode node) at Microsoft.CodeAnalysis.CSharp.CSharpSyntaxNode.ReplaceNodeInListCore(SyntaxNode originalNode,IEnumerable1 replacementNodes)
at Microsoft.CodeAnalysis.SyntaxNodeExtensions.ReplaceNode[TRoot](TRoot root,SyntaxNode oldNode,IEnumerable`1 newNodes)
at Microsoft.CodeAnalysis.Editing.SyntaxEditor.ReplaceWithCollectionChange.Apply(SyntaxNode root,SyntaxNode currentNode,SyntaxGenerator generator)
at Microsoft.CodeAnalysis.Editing.SyntaxEditor.GetChangedRoot()
at Microsoft.CodeAnalysis.Editing.SolutionEditor.GetChangedSolution()
at async Microsoft.CodeAnalysis.CSharp.ImplementInterface.AbstractChangeImplementationCodeRefactoringProvider.ChangeImplementationAsync()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at async Microsoft.CodeAnalysis.CodeActions.CodeAction.ComputeOperationsAsync()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at async Microsoft.CodeAnalysis.CodeActions.CodeAction.ComputePreviewOperationsAsync()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at async Microsoft.CodeAnalysis.CodeActions.CodeAction.GetPreviewOperationsAsync()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at async Microsoft.CodeAnalysis.Editor.Implementation.Suggestions.SuggestedAction.GetPreviewResultAsync()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at async Microsoft.CodeAnalysis.Editor.Implementation.Suggestions.SuggestedActionWithNestedFlavors.PreviewChangesSuggestedAction.CreateAsync()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at async Microsoft.CodeAnalysis.Editor.Implementation.Suggestions.SuggestedActionWithNestedFlavors.GetPreviewChangesFlavorAsync()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at async Microsoft.CodeAnalysis.Editor.Implementation.Suggestions.SuggestedActionWithNestedFlavors.CreateAllFlavorsAsync()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at async Microsoft.CodeAnalysis.Extensions.IExtensionManagerExtensions.PerformFunctionAsyncT

[CyrusNajmabadi]

Fixed with #72027. I believe you already reported this one :)