/usr/lib/ruby/vendor_ruby/active_support/core_ext/array.rb is in ruby-activesupport-3.2 3.2.6-6+deb7u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | require 'active_support/core_ext/array/wrap'
require 'active_support/core_ext/array/access'
require 'active_support/core_ext/array/uniq_by'
require 'active_support/core_ext/array/conversions'
require 'active_support/core_ext/array/extract_options'
require 'active_support/core_ext/array/grouping'
require 'active_support/core_ext/array/random_access'
require 'active_support/core_ext/array/prepend_and_append'
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