/usr/lib/ruby/vendor_ruby/active_support/core_ext/object.rb is in ruby-activesupport-2.3 2.3.14-2.
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 | require 'active_support/core_ext/object/blank'
require 'active_support/core_ext/object/conversions'
require 'active_support/core_ext/object/extending'
require 'active_support/core_ext/object/instance_variables'
require 'active_support/core_ext/object/metaclass'
require 'active_support/core_ext/object/singleton_class'
require 'active_support/core_ext/object/misc'
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