activesupport/lib/active_support/deprecation.rb
Required Files
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