Statement block - Gen<None> - 17 - (0:0,0)
    Code span - Gen<Stmt> - [if(foo) { ] - SpanEditHandler;Accepts:Any - (0:0,0) - Tokens:7
        SyntaxKind.Keyword;[if];
        SyntaxKind.LeftParenthesis;[(];
        SyntaxKind.Identifier;[foo];
        SyntaxKind.RightParenthesis;[)];
        SyntaxKind.Whitespace;[ ];
        SyntaxKind.LeftBrace;[{];
        SyntaxKind.Whitespace;[ ];
    Expression block - Gen<Expr> - 5 - (10:0,10)
        Transition span - Gen<None> - [@] - SpanEditHandler;Accepts:None - (10:0,10) - Tokens:1
            SyntaxKind.Transition;[@];
        Code span - Gen<Expr> - [foo.] - ImplicitExpressionEditHandler;Accepts:NonWhitespace;ImplicitExpression[ATD];K14 - (11:0,11) - Tokens:2
            SyntaxKind.Identifier;[foo];
            SyntaxKind.Dot;[.];
    Code span - Gen<Stmt> - [ }] - SpanEditHandler;Accepts:Any - (15:0,15) - Tokens:2
        SyntaxKind.Whitespace;[ ];
        SyntaxKind.RightBrace;[}];
