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/usr/lib/ruby/vendor_ruby/active_support/core_ext/module/reachable.rb is in ruby-activesupport-3.2 3.2.16-2.

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require 'active_support/core_ext/module/anonymous'
require 'active_support/core_ext/string/inflections'

class Module
  def reachable? #:nodoc:
    !anonymous? && name.safe_constantize.equal?(self)
  end
end