Add missing delegate :extending, to: :all

activerecord/lib/active_record/querying.rb

@@ -8,7 +8,7 @@ module ActiveRecord
     delegate :destroy, :destroy_all, :delete, :delete_all, :update, :update_all, to: :all
     delegate :find_each, :find_in_batches, :in_batches, to: :all
     delegate :select, :group, :order, :except, :reorder, :limit, :offset, :joins, :left_joins, :left_outer_joins, :or,
-             :where, :rewhere, :preload, :eager_load, :includes, :from, :lock, :readonly,
+             :where, :rewhere, :preload, :eager_load, :includes, :from, :lock, :readonly, :extending,
              :having, :create_with, :distinct, :references, :none, :unscope, :merge, to: :all
     delegate :count, :average, :minimum, :maximum, :sum, :calculate, to: :all
     delegate :pluck, :ids, to: :all

activerecord/test/cases/scoping/named_scoping_test.rb

@@ -551,6 +551,12 @@ class NamedScopingTest < ActiveRecord::TestCase
     assert_equal 1, SpecialComment.where(body: "go crazy").created.count
   end
 
+  def test_model_class_should_respond_to_extending
+    assert_raises OopsError do
+      Comment.unscoped.oops_comments.destroy_all
+    end
+  end
+
   def test_model_class_should_respond_to_none
     assert !Topic.none?
     Topic.delete_all

activerecord/test/models/comment.rb

@@ -29,6 +29,8 @@ class Comment < ActiveRecord::Base
 
   default_scope { extending OopsExtension }
 
+  scope :oops_comments, -> { extending OopsExtension }
+
   # Should not be called if extending modules that having the method exists on an association.
   def self.greeting
     raise