remove unnecessary values.

src/EditorFeatures/CSharp/Wrapping/SeparatedSyntaxList/CSharpArgumentWrapper.cs

@@ -49,7 +49,7 @@ protected override BaseArgumentListSyntax TryGetApplicableList(SyntaxNode node)
 
                 startToken = name == null ? listSyntax.GetFirstToken() : name.GetFirstToken();
             }
-            else if (declaration is ObjectCreationExpressionSyntax objectCreation)
+            else if (declaration is ObjectCreationExpressionSyntax)
             {
                 // allow anywhere in `new Foo(...)`
                 startToken = declaration.GetFirstToken();

src/Features/CSharp/Portable/CodeFixes/Nullable/CSharpDeclareAsNullableCodeFixProvider.cs

@@ -51,8 +51,6 @@ public override async Task RegisterCodeFixesAsync(CodeFixContext context)
             Document document, ImmutableArray<Diagnostic> diagnostics,
             SyntaxEditor editor, CancellationToken cancellationToken)
         {
-            var root = editor.OriginalRoot;
-
             // a method can have multiple `return null;` statements, but we should only fix its return type once
             var alreadyHandled = PooledHashSet<TypeSyntax>.GetInstance();
 

src/VisualStudio/Core/Def/Implementation/Venus/ContainedDocument.cs

@@ -878,7 +878,6 @@ private int GetBaseIndentation(SyntaxNode root, SourceText text, TextSpan span)
             var editorOptions = editorOptionsFactory.GetOptions(DataBuffer);
 
             var additionalIndentation = GetAdditionalIndentation(root, text, span);
-            int useTabs = 0, tabSize = 0;
 
             // Skip over the first line, since it's in "Venus space" anyway.
             var startingLine = text.Lines.GetLineFromPosition(span.Start);
@@ -888,10 +887,10 @@ private int GetBaseIndentation(SyntaxNode root, SourceText text, TextSpan span)
                     ContainedLanguageHost.GetLineIndent(
                         line.LineNumber,
                         out var baseIndentationString,
-                        out var parent,
-                        out var indentSize,
-                        out useTabs,
-                        out tabSize));
+                        out _,
+                        out _,
+                        out _,
+                        out _));
 
                 if (!string.IsNullOrEmpty(baseIndentationString))
                 {

src/VisualStudio/Core/Impl/CodeModel/FileCodeModel_Events.cs

@@ -344,7 +344,7 @@ private EnvDTE.CodeElement GetAttributeArgumentForCodeModelEvent(CodeModelEvent
                 return null;
             }
 
-            CodeModelService.GetAttributeArgumentParentAndIndex(codeModelEvent.Node, out var attributeNode, out var ordinal);
+            CodeModelService.GetAttributeArgumentParentAndIndex(codeModelEvent.Node, out _, out var ordinal);
 
             if (codeModelEvent.Type == CodeModelEventType.Remove)
             {

src/Workspaces/CSharp/Portable/CodeGeneration/CSharpSyntaxGenerator.cs

@@ -1490,7 +1490,7 @@ private static DeclarationModifiers GetAllowedModifiers(SyntaxKind kind)
         public override DeclarationModifiers GetModifiers(SyntaxNode declaration)
         {
             var modifierTokens = GetModifierTokens(declaration);
-            GetAccessibilityAndModifiers(modifierTokens, out var accessibility, out var modifiers);
+            GetAccessibilityAndModifiers(modifierTokens, out _, out var modifiers);
             return modifiers;
         }
 

src/Workspaces/CoreTest/SolutionTests/SolutionTests.cs

@@ -357,8 +357,8 @@ public async Task TestProjectDependencyLoadingAsync()
             var solution = CreateSolutionWithProjectDependencyChain(projectCount);
             var projectIds = solution.ProjectIds.ToArray();
 
-            var compilation0 = await solution.GetProject(projectIds[0]).GetCompilationAsync(CancellationToken.None);
-            var compilation2 = await solution.GetProject(projectIds[2]).GetCompilationAsync(CancellationToken.None);
+            await solution.GetProject(projectIds[0]).GetCompilationAsync(CancellationToken.None);
+            await solution.GetProject(projectIds[2]).GetCompilationAsync(CancellationToken.None);
         }
 
         [Fact, Trait(Traits.Feature, Traits.Features.Workspace)]