Statement block - Gen<None> - 23 - (0:0,0)
    Transition span - Gen<None> - [@] - SpanEditHandler;Accepts:None - (0:0,0) - Tokens:1
        SyntaxKind.Transition;[@];
    Code span - Gen<Stmt> - [while(true) { foo(); }] - SpanEditHandler;Accepts:None - (1:0,1) - Tokens:13
        SyntaxKind.Keyword;[while];
        SyntaxKind.LeftParenthesis;[(];
        SyntaxKind.Keyword;[true];
        SyntaxKind.RightParenthesis;[)];
        SyntaxKind.Whitespace;[ ];
        SyntaxKind.LeftBrace;[{];
        SyntaxKind.Whitespace;[ ];
        SyntaxKind.Identifier;[foo];
        SyntaxKind.LeftParenthesis;[(];
        SyntaxKind.RightParenthesis;[)];
        SyntaxKind.Semicolon;[;];
        SyntaxKind.Whitespace;[ ];
        SyntaxKind.RightBrace;[}];
