Created
November 3, 2011 22:59
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| ruby-1.9.2-p180 :001 > require 'active_support' | |
| => true | |
| ruby-1.9.2-p180 :002 > [0, 1, 2].sum | |
| NoMethodError: undefined method `sum' for [0, 1, 2]:Array |
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