/usr/lib/ruby/vendor_ruby/action_dispatch/journey/backwards.rb is in ruby-actionpack 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 | module Rack # :nodoc:
Mount = ActionDispatch::Journey::Router
Mount::RouteSet = ActionDispatch::Journey::Router
Mount::RegexpWithNamedGroups = ActionDispatch::Journey::Path::Pattern
end
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