private static void AddToExisting(DocumentEditor editor, ExpressionStatementSyntax statement, IFieldSymbol field) { if (TryGetPreviousStatement(out var previous) && TryGetCreateCompositeDisposable(out var compositeDisposableCreation)) { editor.RemoveNode(statement); editor.AddItemToCollectionInitializer( compositeDisposableCreation, statement.Expression, statement.GetTrailingTrivia()); }