/usr/lib/ruby/vendor_ruby/active_support/builder.rb is in ruby-activesupport-3.2 3.2.16-2.
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 | begin
require 'builder'
rescue LoadError => e
$stderr.puts "You don't have builder installed in your application. Please add it to your Gemfile and run bundle install"
raise e
end
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