public TestNode()
                : base(SyntaxKind.NamespaceDeclaration)
            {
                _NamespaceKeyword = new SyntaxToken(SyntaxKind.NamespaceKeyword);
                _Name             = new SyntaxIdentifier("Foo");

                _FullWidth = _NamespaceKeyword.FullWidth +
                             _Name.FullWidth;
            }
            public TestNode() 
                : base(SyntaxKind.NamespaceDeclaration)
            {
                _NamespaceKeyword = new SyntaxToken(SyntaxKind.NamespaceKeyword);
                _Name = new SyntaxIdentifier("Foo");

                _FullWidth = _NamespaceKeyword.FullWidth +
                             _Name.FullWidth;
            }