必需文件
- active_support/deprecation/behaviors
- active_support/deprecation/reporting
- active_support/deprecation/disallowed
- active_support/deprecation/constant_accessor
- active_support/deprecation/method_wrappers
- active_support/deprecation/proxy_wrappers
- active_support/deprecation/deprecators
- active_support/core_ext/module/deprecation
- concurrent/atomic/thread_local_var
命名空间