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/usr/lib/ruby/vendor_ruby/active_support/json/variable.rb is in ruby-activesupport-3.2 3.2.16-2.

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module ActiveSupport
  module JSON
    # A string that returns itself as its JSON-encoded form.
    class Variable < String
      def as_json(options = nil) self end #:nodoc:
      def encode_json(encoder) self end #:nodoc:
    end
  end
end