Directive block - Gen<Directive:{TestDirective;SingleLine;Unrestricted}> - 15 - (0:0,0)
    Transition span - Gen<None> - [@] - SpanEditHandler;Accepts:None - (0:0,0) - Tokens:1
        SyntaxKind.Transition;[@];
    MetaCode span - Gen<None> - [TestDirective] - SpanEditHandler;Accepts:None - (1:0,1) - Tokens:1
        SyntaxKind.Identifier;[TestDirective];
    Code span - Gen<None> - [ ] - SpanEditHandler;Accepts:Whitespace - (14:0,14) - Tokens:1
        SyntaxKind.Whitespace;[ ];
    Code span - Gen<DirectiveToken {;Member;Opt:True}> - [] - DirectiveTokenEditHandler;Accepts:NonWhitespace - (15:0,15) - Tokens:1
        SyntaxKind.Unknown;[];
