require 'facets/core/nilclass/empty'
require 'facets/core/nilclass/include'
require 'facets/core/nilclass/length'
require 'facets/core/nilclass/op_fetch'
require 'facets/core/nilclass/size'
require 'facets/core/nilclass/to_f'
require 'facets/core/nilclass/to_h'