/usr/lib/ruby/vendor_ruby/active_support/core_ext/hash.rb is in ruby-activesupport 2:4.2.10-0ubuntu4.
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 9 | require 'active_support/core_ext/hash/compact'
require 'active_support/core_ext/hash/conversions'
require 'active_support/core_ext/hash/deep_merge'
require 'active_support/core_ext/hash/except'
require 'active_support/core_ext/hash/indifferent_access'
require 'active_support/core_ext/hash/keys'
require 'active_support/core_ext/hash/reverse_merge'
require 'active_support/core_ext/hash/slice'
require 'active_support/core_ext/hash/transform_values'
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