Rule: Avoid too complex anonymous functions

We can measure the number of statements...
...the number of function clauses

We can measure complexity, and define lower threshold (like 2), or we can also add the number of lines to it later...

I have the same problem here as in the BranchesOfRecursion. I can save the complexity on the sub SourceFunctions but in the check#leaveNode method I cannot access to the cumulated results, only its own results (without nested SourceFunctions...)