rails master fixes

Gemfile_master.lock

@@ -64,11 +64,11 @@ GIT
 
 GIT
   remote: https://github.com/rails/sass-rails.git
-  revision: 423178729e7b84addcee78b33891644b1fc1705b
+  revision: b4b5f32a2928ef203f4b442bc538a572645de8e3
   specs:
     sass-rails (5.0.0.beta1)
       railties (>= 4.0.0, < 5.0)
-      sass (~> 3.2)
+      sass (~> 3.2, >= 3.2.2)
       sprockets (~> 2.12)
       sprockets-rails (>= 2.0, < 4.0)
 

config/initializers/sprockets.rb

@@ -2,5 +2,20 @@ require_dependency 'sass/discourse_stylesheets'
 require_dependency 'sass/discourse_sass_importer'
 require_dependency 'sass/discourse_safe_sass_importer'
 
-Sprockets.send(:remove_const, :SassImporter)
-Sprockets::SassImporter = DiscourseSassImporter
+if defined?(Sass::Rails::SassTemplate)
+  DiscourseSassTemplate = Class.new(Sass::Rails::SassTemplate) do
+    def importer_class
+      DiscourseSassImporter
+    end
+  end
+  DiscourseScssTemplate = Class.new(DiscourseSassTemplate) do
+    def syntax
+      :scss
+    end
+  end
+  Rails.application.assets.register_engine '.sass', DiscourseSassTemplate
+  Rails.application.assets.register_engine '.scss', DiscourseScssTemplate
+else
+  Sprockets.send(:remove_const, :SassImporter)
+  Sprockets::SassImporter = DiscourseSassImporter
+end