1 files changed, 9 insertions, 1 deletions
diff --git a/actionpack/lib/action_view/template/handler.rb b/actionpack/lib/action_view/template/handler.rb
index c6a1bc6235..0a9d299807 100644
--- a/actionpack/lib/action_view/template/handler.rb
+++ b/actionpack/lib/action_view/template/handler.rb
@@ -1,4 +1,4 @@
-require "action_dispatch/http/mime_type"
+require 'action_dispatch/http/mime_type'
 require 'active_support/core_ext/class/attribute'
 
 # Legacy TemplateHandler stub
@@ -7,6 +7,8 @@ module ActionView
     module Handlers #:nodoc:
       module Compilable
         def self.included(base)
+          ActiveSupport::Deprecation.warn "Including Compilable in your template handler is deprecated. " <<
+            "All the API your template handler needs to implement is to respond to #call."
           base.extend(ClassMethods)
         end
 
@@ -26,6 +28,12 @@ module ActionView
       class_attribute :default_format
       self.default_format = Mime::HTML
 
+      def self.inherited(base)
+        ActiveSupport::Deprecation.warn "Inheriting from ActionView::Template::Handler is deprecated. " <<
+          "All the API your template handler needs to implement is to respond to #call."
+        super
+      end
+
       def self.call(template)
         raise "Need to implement #{self.class.name}#call(template)"
       end