private async Task<Document> DiagnosticSeverityError(Document document, ArgumentSyntax argument, CancellationToken c)
        {
            SyntaxGenerator generator = SyntaxGenerator.GetGenerator(document);

            SyntaxNode expression = generator.IdentifierName("DiagnosticSeverity");
            var newExpression = generator.MemberAccessExpression(expression, "Error") as ExpressionSyntax;
            var rule = argument.FirstAncestorOrSelf<FieldDeclarationSyntax>();
            var newRule = rule.ReplaceNode(argument.Expression, newExpression);

            return await ReplaceNode(argument.FirstAncestorOrSelf<FieldDeclarationSyntax>(), newRule.WithTrailingTrivia(SyntaxFactory.TriviaList(SyntaxFactory.EndOfLine("\r\n"), SyntaxFactory.Whitespace("        "), SyntaxFactory.ParseTrailingTrivia("// defaultSeverity: Is set to DiagnosticSeverity.[severity] where severity can be Error, Warning, Hidden or Info, but can only be Error or Warning for the purposes of this tutorial").ElementAt(0), SyntaxFactory.EndOfLine("\r\n"))).WithLeadingTrivia(argument.FirstAncestorOrSelf<FieldDeclarationSyntax>().GetLeadingTrivia()), document);
        }
        private async Task<Document> EnabledByDefaultAsync(Document document, ArgumentSyntax argument, CancellationToken c)
        {
            SyntaxGenerator generator = SyntaxGenerator.GetGenerator(document);

            var rule = argument.FirstAncestorOrSelf<FieldDeclarationSyntax>();
            var newRule = rule.ReplaceNode(argument.Expression, generator.LiteralExpression(true));

            return await ReplaceNode(argument.FirstAncestorOrSelf<FieldDeclarationSyntax>(), newRule.WithTrailingTrivia(SyntaxFactory.TriviaList(SyntaxFactory.EndOfLine("\r\n"), SyntaxFactory.Whitespace("        "), SyntaxFactory.ParseTrailingTrivia("// isEnabledByDefault: Determines whether the analyzer is enabled by default or if the user must manually enable it. Generally set to true").ElementAt(0), SyntaxFactory.EndOfLine("\r\n"))).WithLeadingTrivia(argument.FirstAncestorOrSelf<FieldDeclarationSyntax>().GetLeadingTrivia()), document);
        }