SCL-3

* ignore some test - crash tests (lag)
* rework after code analyze (syntax)
TreeApi#toString invoke Printers#treeToString. If toString override explicitly Object#toString then you can use properly call without parentheses.
>It's recommended to still write the empty parentheses when the invoked method represents more than a property of its receiver object. *Refer to Programming in Scala. 10.3 Defining paraneterless methods