/usr/lib/ruby/vendor_ruby/active_support/core_ext/class.rb is in ruby-activesupport-2.3 2.3.14-7.
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 | require 'active_support/core_ext/class/attribute_accessors'
require 'active_support/core_ext/class/inheritable_attributes'
require 'active_support/core_ext/class/removal'
require 'active_support/core_ext/class/delegating_attributes'
require 'active_support/core_ext/class/attribute'
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