Directive block - Gen<Directive:{namespace;SingleLine;Unrestricted}> - 10 - (0:0,0)
    Transition span - Gen<None> - [@] - SpanEditHandler;Accepts:None - (0:0,0) - Symbols:1
        CSharpSymbolType.Transition;[@];
    MetaCode span - Gen<None> - [namespace] - SpanEditHandler;Accepts:None - (1:0,1) - Symbols:1
        CSharpSymbolType.Keyword;[namespace];
