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Is this freeware, public domain, MIT, APLv2, GPLv2/3, ....?

Not a SyntaxError -- RubyCop crashes internally: RubyCop::NodeBuilder.build("x.()").accept(RubyCop::Policy.new) Awesome gem, by the way!

What is the reasoning behind blocking these constants?

Easy way to test, go [here](http://rtfz.codeschool.com/levels/1/challenges/1), enter "return", and click submit. The exception it throws is caused by RubyCop.

Supposing some code fails to pass the policy, is there a way to get to the failing line number, and the reason it failed (e.g. "line 1: disallowed call to...