Array.fetch

array.rb

class Array                                                                                                                                                                                                     
  def [](index)                                                                                                                                                                                                 
    fetch(index)                                                                                                                                                                                                
  end                                                                                                                                                                                                           
end

irb.rb

> basket = ['bread', 'wine']
  => ["bread", "wine"]

> basket[2]
  IndexError: index 2 outside of array bounds: -2...2
    from (irb):14:in `fetch'
    from (irb):14
    from /Users/huntca/.rvm/rubies/ruby-1.9.3-p0/bin/irb:16:in `<main>'