module ActiveSupport::Dependencies

def autoload_module!(into, const_name, qualified_name, path_suffix)

set of constants that are to be unloaded.
the directory was loaded from a reloadable base path, it is added to the
assigned to +into+'s constants with the name +const_name+. Provided that
matching the expected path suffix. If found, the module is created and
Attempt to autoload the provided module name by searching for a directory 
def autoload_module!(into, const_name, qualified_name, path_suffix)
  return nil unless base_path = autoloadable_module?(path_suffix)
  mod = Module.new
  into.const_set const_name, mod
  log("constant #{qualified_name} autoloaded (module autovivified from #{File.join(base_path, path_suffix)})")
  autoloaded_constants << qualified_name unless autoload_once_paths.include?(base_path)
  autoloaded_constants.uniq!
  mod
end