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