Expression block - Gen<Expr> - 10 - (0:0,0)
    MetaCode span - Gen<None> - [(] - SpanEditHandler;Accepts:None - (0:0,0) - Symbols:1
        CSharpSymbolType.LeftParenthesis;[(];
    Code span - Gen<Expr> - [foo barLF] - SpanEditHandler;Accepts:Any - (1:0,1) - Symbols:4
        CSharpSymbolType.Identifier;[foo];
        CSharpSymbolType.WhiteSpace;[ ];
        CSharpSymbolType.Identifier;[bar];
        CSharpSymbolType.NewLine;[LF];
