method_added

# File activesupport/lib/active_support/deprecation/instance_delegator.rb, line 20
        def method_added(method_name)
          use_instead =
            case method_name
            when :silence, :behavior=, :disallowed_behavior=, :disallowed_warnings=, :silenced=, :debug=
              target = "(defined?(Rails.application.deprecators) ? Rails.application.deprecators : ActiveSupport::Deprecation._instance)"
              "Rails.application.deprecators.#{method_name}"
            when :warn, :deprecate_methods, :gem_name, :gem_name=, :deprecation_horizon, :deprecation_horizon=
              "your own Deprecation object"
            else
              "Rails.application.deprecators[framework].#{method_name} where framework is for example :active_record"
            end
          args = /[^\]]=\z/.match?(method_name) ? "arg" : "..."
          target ||= "ActiveSupport::Deprecation._instance"
          singleton_class.module_eval <<~RUBY, __FILE__, __LINE__ + 1
            def #{method_name}(#{args})
              #{target}.#{method_name}(#{args})
            ensure
              ActiveSupport.deprecator.warn("Calling #{method_name} on ActiveSupport::Deprecation is deprecated and will be removed from Rails (use #{use_instead} instead)")
            end
          RUBY
        end