Use local functions

src/VisualStudio/CSharp/Impl/CodeModel/CSharpCodeModelService.cs

@@ -2693,8 +2693,7 @@ public override EnvDTE80.vsCMPropertyKind GetReadWrite(SyntaxNode memberNode)
         {
             Debug.Assert(memberNode is BasePropertyDeclarationSyntax);
 
-            var property = memberNode as BasePropertyDeclarationSyntax;
-            if (property == null)
+            if (!(memberNode is BasePropertyDeclarationSyntax property))
             {
                 throw Exceptions.ThrowEFail();
             }

src/VisualStudio/CSharp/Impl/CodeModel/MethodXml/MethodXmlBuilder.cs

@@ -384,8 +384,7 @@ private bool TryGenerateCast(CastExpressionSyntax castExpression)
 
         private bool TryGenerateNewClass(ObjectCreationExpressionSyntax objectCreationExpression)
         {
-            var type = SemanticModel.GetSymbolInfo(objectCreationExpression.Type).Symbol as ITypeSymbol;
-            if (type == null)
+            if (!(SemanticModel.GetSymbolInfo(objectCreationExpression.Type).Symbol is ITypeSymbol type))
             {
                 return false;
             }

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

@@ -3915,10 +3915,7 @@ public override SyntaxNode ValueReturningLambdaExpression(IEnumerable<SyntaxNode
         }
 
         private static bool IsSimpleLambdaParameter(SyntaxNode node)
-        {
-            var p = node as ParameterSyntax;
-            return p != null && p.Type == null && p.Default == null && p.Modifiers.Count == 0;
-        }
+            => node is ParameterSyntax p && p.Type == null && p.Default == null && p.Modifiers.Count == 0;
 
         public override SyntaxNode VoidReturningLambdaExpression(IEnumerable<SyntaxNode> lambdaParameters, SyntaxNode expression)
         {

src/Workspaces/CoreTest/SolutionTests/SolutionTests.cs

@@ -1530,12 +1530,12 @@ public void TestUpdateDocumentsOrder()
             var solution = CreateSolution();
             var pid = ProjectId.CreateNewId();
 
-            Func<VersionStamp> GetVersion = () => solution.GetProject(pid).Version;
-            Func<ImmutableArray<DocumentId>> GetDocumentIds = () => solution.GetProject(pid).DocumentIds.ToImmutableArray();
-            Func<ImmutableArray<SyntaxTree>> GetSyntaxTrees = () =>
-                {
-                    return solution.GetProject(pid).GetCompilationAsync().Result.SyntaxTrees.ToImmutableArray();
-                };
+            VersionStamp GetVersion() => solution.GetProject(pid).Version;
+            ImmutableArray<DocumentId> GetDocumentIds() => solution.GetProject(pid).DocumentIds.ToImmutableArray();
+            ImmutableArray<SyntaxTree> GetSyntaxTrees()
+            {
+                return solution.GetProject(pid).GetCompilationAsync().Result.SyntaxTrees.ToImmutableArray();
+            }
 
             solution = solution.AddProject(pid, "test", "test.dll", LanguageNames.CSharp);