module Concurrent::SettableStruct

def self.new(*args, &block)

@!macro struct_new 
def self.new(*args, &block)
  clazz_name = nil
  if args.length == 0
    raise ArgumentError.new('wrong number of arguments (0 for 1+)')
  elsif args.length > 0 && args.first.is_a?(String)
    clazz_name = args.shift
  end
  FACTORY.define_struct(clazz_name, args, &block)
end