Expression block - Gen<Expr> - 2 - (0:0,0)
    Transition span - Gen<None> - [@] - SpanEditHandler;Accepts:None - (0:0,0) - Symbols:1
        CSharpSymbolType.Transition;[@];
    MetaCode span - Gen<None> - [(] - SpanEditHandler;Accepts:None - (1:0,1) - Symbols:1
        CSharpSymbolType.LeftParenthesis;[(];
    Code span - Gen<Expr> - [] - SpanEditHandler;Accepts:Any - (2:0,2) - Symbols:1
        CSharpSymbolType.Unknown;[];
