NullReferenceException in SyntaxRemover.VisitGlobalStatement with top-level statement

[cston]

1. Run devenv.exe with commit 9be1ef7.
2. Create Console Application
3. Replace Program.cs contents with:

int x = 1;

class Program
{
    static void Main(string[] args)
    {
    }
}

4. Click on fix for int x = 1; statement, and choose "Remove unused variable"

NullReferenceException:
>	Microsoft.CodeAnalysis.CSharp.dll!Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.VisitGlobalStatement(Microsoft.CodeAnalysis.CSharp.Syntax.GlobalStatementSyntax node) Line 1851	C#
 	Microsoft.CodeAnalysis.CSharp.dll!Microsoft.CodeAnalysis.CSharp.Syntax.GlobalStatementSyntax.Accept<Microsoft.CodeAnalysis.SyntaxNode>(Microsoft.CodeAnalysis.CSharp.CSharpSyntaxVisitor<Microsoft.CodeAnalysis.SyntaxNode> visitor) Line 4881	C#
 	Microsoft.CodeAnalysis.CSharp.dll!Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.Visit(Microsoft.CodeAnalysis.SyntaxNode node) Line 41	C#
 	Microsoft.CodeAnalysis.CSharp.dll!Microsoft.CodeAnalysis.CSharp.Syntax.SyntaxNodeRemover.SyntaxRemover.Visit(Microsoft.CodeAnalysis.SyntaxNode node) Line 176	C#
 	Microsoft.CodeAnalysis.CSharp.dll!Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.VisitListElement<Microsoft.CodeAnalysis.CSharp.Syntax.MemberDeclarationSyntax>(Microsoft.CodeAnalysis.CSharp.Syntax.MemberDeclarationSyntax node) Line 167	C#
 	Microsoft.CodeAnalysis.CSharp.dll!Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.VisitList<Microsoft.CodeAnalysis.CSharp.Syntax.MemberDeclarationSyntax>(Microsoft.CodeAnalysis.SyntaxList<Microsoft.CodeAnalysis.CSharp.Syntax.MemberDeclarationSyntax> list) Line 144	C#
 	Microsoft.CodeAnalysis.CSharp.dll!Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.VisitCompilationUnit(Microsoft.CodeAnalysis.CSharp.Syntax.CompilationUnitSyntax node) Line 1980	C#
 	Microsoft.CodeAnalysis.CSharp.dll!Microsoft.CodeAnalysis.CSharp.Syntax.CompilationUnitSyntax.Accept<Microsoft.CodeAnalysis.SyntaxNode>(Microsoft.CodeAnalysis.CSharp.CSharpSyntaxVisitor<Microsoft.CodeAnalysis.SyntaxNode> visitor) Line 7750	C#
 	Microsoft.CodeAnalysis.CSharp.dll!Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.Visit(Microsoft.CodeAnalysis.SyntaxNode node) Line 41	C#
 	Microsoft.CodeAnalysis.CSharp.dll!Microsoft.CodeAnalysis.CSharp.Syntax.SyntaxNodeRemover.SyntaxRemover.Visit(Microsoft.CodeAnalysis.SyntaxNode node) Line 176	C#
 	Microsoft.CodeAnalysis.CSharp.dll!Microsoft.CodeAnalysis.CSharp.Syntax.SyntaxNodeRemover.RemoveNodes<Microsoft.CodeAnalysis.CSharp.CSharpSyntaxNode>(Microsoft.CodeAnalysis.CSharp.CSharpSyntaxNode root, System.Collections.Generic.IEnumerable<Microsoft.CodeAnalysis.SyntaxNode> nodes, Microsoft.CodeAnalysis.SyntaxRemoveOptions options) Line 34	C#
 	Microsoft.CodeAnalysis.CSharp.dll!Microsoft.CodeAnalysis.CSharp.CSharpSyntaxNode.RemoveNodesCore(System.Collections.Generic.IEnumerable<Microsoft.CodeAnalysis.SyntaxNode> nodes, Microsoft.CodeAnalysis.SyntaxRemoveOptions options) Line 525	C#
 	Microsoft.CodeAnalysis.dll!Microsoft.CodeAnalysis.SyntaxNodeExtensions.RemoveNode<Microsoft.CodeAnalysis.SyntaxNode>(Microsoft.CodeAnalysis.SyntaxNode root, Microsoft.CodeAnalysis.SyntaxNode node, Microsoft.CodeAnalysis.SyntaxRemoveOptions options) Line 269	C#
 	Microsoft.CodeAnalysis.Workspaces.dll!Microsoft.CodeAnalysis.Editing.SyntaxGenerator.RemoveNode(Microsoft.CodeAnalysis.SyntaxNode root, Microsoft.CodeAnalysis.SyntaxNode node, Microsoft.CodeAnalysis.SyntaxRemoveOptions options) Line 1199	C#
 	Microsoft.CodeAnalysis.CSharp.Workspaces.dll!Microsoft.CodeAnalysis.CSharp.CodeGeneration.CSharpSyntaxGenerator.RemoveNodeInternal(Microsoft.CodeAnalysis.SyntaxNode root, Microsoft.CodeAnalysis.SyntaxNode declaration, Microsoft.CodeAnalysis.SyntaxRemoveOptions options) Line 2945	C#
 	Microsoft.CodeAnalysis.CSharp.Workspaces.dll!Microsoft.CodeAnalysis.CSharp.CodeGeneration.CSharpSyntaxGenerator.RemoveNode.AnonymousMethod__0(Microsoft.CodeAnalysis.SyntaxNode r) Line 2886	C#
 	Microsoft.CodeAnalysis.Workspaces.dll!Microsoft.CodeAnalysis.Editing.SyntaxGenerator.PreserveTrivia<Microsoft.CodeAnalysis.SyntaxNode>(Microsoft.CodeAnalysis.SyntaxNode node, System.Func<Microsoft.CodeAnalysis.SyntaxNode, Microsoft.CodeAnalysis.SyntaxNode> nodeChanger) Line 1254	C#
 	Microsoft.CodeAnalysis.CSharp.Workspaces.dll!Microsoft.CodeAnalysis.CSharp.CodeGeneration.CSharpSyntaxGenerator.Isolate(Microsoft.CodeAnalysis.SyntaxNode declaration, System.Func<Microsoft.CodeAnalysis.SyntaxNode, Microsoft.CodeAnalysis.SyntaxNode> editor) Line 1959	C#
 	Microsoft.CodeAnalysis.CSharp.Workspaces.dll!Microsoft.CodeAnalysis.CSharp.CodeGeneration.CSharpSyntaxGenerator.RemoveNode(Microsoft.CodeAnalysis.SyntaxNode root, Microsoft.CodeAnalysis.SyntaxNode node, Microsoft.CodeAnalysis.SyntaxRemoveOptions options) Line 2886	C#
 	Microsoft.CodeAnalysis.Workspaces.dll!Microsoft.CodeAnalysis.Editing.SyntaxEditor.RemoveChange.Apply(Microsoft.CodeAnalysis.SyntaxNode root, Microsoft.CodeAnalysis.Editing.SyntaxGenerator generator) Line 294	C#
 	Microsoft.CodeAnalysis.Workspaces.dll!Microsoft.CodeAnalysis.Editing.SyntaxEditor.GetChangedRoot() Line 88	C#
 	Microsoft.CodeAnalysis.Workspaces.dll!Microsoft.CodeAnalysis.CodeFixes.SyntaxEditorBasedCodeFixProvider.FixAllWithEditorAsync(Microsoft.CodeAnalysis.Document document, System.Func<Microsoft.CodeAnalysis.Editing.SyntaxEditor, System.Threading.Tasks.Task> editAsync, System.Threading.CancellationToken cancellationToken) Line 47	C#

[cston]

cc @AlekseyTs

[AlekseyTs]

@cston Is this a dupe of #44273?

[jcouv]

Yes, this is a dupe of #44273. I'm working on a fix. Closing