Bug #769: Mathn's Rational#power2 is broken on 1.8.6 and 1.8.7
http://redmine.ruby-lang.org/issues/show/769

Author: Jim Deville
Status: Open, Priority: Normal

Mathn's Rational#power2 method is broken in multiple places.
1. The loop has no variant, it can go into an infinite loop, unless the conditional is true from the start.
2. 1.8.6 still has the neaed typo (Redmine #175)
3. assignment to nearn on line 208
4. Construction of a Rational with 2 non-existant variables: num and den (dem is used, but not den)

Some test cases that demonstrate the broken code:
(Rational.new!(1, 4).power2(Rational.new!(1, 2))) #(NameError for neaed)
(Rational.new!(3, 4).power2(Rational.new!(0, 3))) #Infinite loop


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