simplify

src/Features/Core/Portable/GenerateConstructorFromMembers/AbstractGenerateConstructorFromMembersCodeRefactoringProvider.ConstructorDelegatingCodeAction.cs

@@ -53,8 +53,8 @@ protected override async Task<Document> GetChangedDocumentAsync(CancellationToke
                 var thisConstructorArguments = factory.CreateArguments(
                     _state.Parameters.Take(_state.DelegatedConstructor.Parameters.Length).ToImmutableArray());
 
-                var nullCheckStatements = ArrayBuilder<SyntaxNode>.GetInstance();
-                var assignStatements = ArrayBuilder<SyntaxNode>.GetInstance();
+                using var _1 = ArrayBuilder<SyntaxNode>.GetInstance(out var nullCheckStatements);
+                using var _2 = ArrayBuilder<SyntaxNode>.GetInstance(out var assignStatements);
 
                 var options = await _document.GetOptionsAsync(cancellationToken).ConfigureAwait(false);
                 var useThrowExpressions = _service.PrefersThrowExpression(options);
@@ -84,7 +84,7 @@ protected override async Task<Document> GetChangedDocumentAsync(CancellationToke
                     ? syntaxTree.GetLocation(_state.TextSpan)
                     : null;
 
-                var statements = nullCheckStatements.ToImmutableAndFree().Concat(assignStatements.ToImmutableAndFree());
+                var statements = nullCheckStatements.ToImmutable().Concat(assignStatements.ToImmutable());
                 var result = await codeGenerationService.AddMethodAsync(
                     _document.Project.Solution,
                     _state.ContainingType,

src/Features/Core/Portable/GenerateConstructorFromMembers/AbstractGenerateConstructorFromMembersCodeRefactoringProvider.cs

@@ -109,7 +109,7 @@ private async Task HandleNonSelectionAsync(CodeRefactoringContext context)
                 return;
             }
 
-            var pickMemberOptions = ArrayBuilder<PickMembersOption>.GetInstance();
+            using var _ = ArrayBuilder<PickMembersOption>.GetInstance(out var pickMemberOptions);
             var canAddNullCheck = viableMembers.Any(
                 m => m.GetSymbolType().CanAddNullCheck());
 
@@ -127,7 +127,7 @@ private async Task HandleNonSelectionAsync(CodeRefactoringContext context)
             context.RegisterRefactoring(
                 new GenerateConstructorWithDialogCodeAction(
                     this, document, textSpan, containingType, viableMembers,
-                    pickMemberOptions.ToImmutableAndFree()),
+                    pickMemberOptions.ToImmutable()),
                 typeDeclaration.Span);
         }
 
@@ -152,15 +152,13 @@ private async Task HandleNonSelectionAsync(CodeRefactoringContext context)
 
         private ImmutableArray<CodeAction> GetCodeActions(Document document, State state, bool addNullChecks)
         {
-            var result = ArrayBuilder<CodeAction>.GetInstance();
+            using var _ = ArrayBuilder<CodeAction>.GetInstance(out var result);
 
             result.Add(new FieldDelegatingCodeAction(this, document, state, addNullChecks));
             if (state.DelegatedConstructor != null)
-            {
                 result.Add(new ConstructorDelegatingCodeAction(this, document, state, addNullChecks));
-            }
 
-            return result.ToImmutableAndFree();
+            return result.ToImmutable();
         }
 
         private static async Task<Document> AddNavigationAnnotationAsync(Document document, CancellationToken cancellationToken)