mvr

def self.first_uninteresting
  numbers = all(:order=>:number, :conditions=>"number >= 0").map(&:number)
  highest = numbers.sort.last
  missing = (1..highest).to_a - numbers
  return highest + 1 if missing.empty?
  missing.first
end

mvr

Source
_global_ = 1

class Blah
  def foo(a, b)
    c = a._op_plus(b)
    _global_.print(c)
  end
end