activesupport/lib/active_support/deprecation.rb
Required Files
active_support/deprecation/ instance_delegator 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