/usr/lib/ruby/vendor_ruby/active_support/core_ext/kernel.rb is in ruby-activesupport 2:4.2.6-1.
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/kernel/agnostics'
require 'active_support/core_ext/kernel/concern'
require 'active_support/core_ext/kernel/debugger' if RUBY_VERSION < '2.0.0'
require 'active_support/core_ext/kernel/reporting'
require 'active_support/core_ext/kernel/singleton_class'
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