########    #######    ########    #######    ########    ########
##     / / / /    License    \ \ \ \
##    Copyleft culture, Copyright (C) is prohibited here
##    This work is licensed under a CC BY-SA 4.0
##    Creative Commons Attribution-ShareAlike 4.0 License
##    Refer to the http://creativecommons.org/licenses/by-sa/4.0/
########    #######    ########    #######    ########    ########
##    / / / /    Code Climate    \ \ \ \
##    Language = ruby
##    Indent = space;    2 chars;
########    #######    ########    #######    ########    ########

class Hash
  def self.recursive
    new { |hash, key| hash[key] = recursive }
  end
end