Defining Custom Errors for ruby library(ruby-gem)

game_errors.rb

# let say you have a class Game and its Audio
module Audio
  class NoDeviceError < Error::ENODEV # (No such device)
  end
end


class Game
  include Audio
  
  class Error < StandardError
  end
  
  class GraphicError < Error
  end
end

# To handle Game::GraphicError and Audio::NoDeviceError 
# the library user can rescue Game::Error