Sprockets 2 render_engine has different arity

Author: schneems

lib/sass/rails/railtie.rb

@@ -55,8 +55,13 @@ class Railtie < ::Rails::Railtie
 
       config.assets.configure do |env|
         if env.respond_to?(:register_engine)
-          env.register_engine '.sass', Sass::Rails::SassTemplate, silence_deprecation: true
-          env.register_engine '.scss', Sass::Rails::ScssTemplate, silence_deprecation: true
+          args = ['.sass', Sass::Rails::SassTemplate]
+          args << { silence_deprecation: true } if env.method(:register_engine).arity > 2
+          env.register_engine *args
+
+          args = ['.scss', Sass::Rails::ScssTemplate]
+          args << { silence_deprecation: true } if env.method(:register_engine).arity > 2
+          env.register_engine *args
         end
 
         if env.respond_to?(:register_transformer)