1 files changed, 4 insertions, 3 deletions
diff --git a/activesupport/lib/active_support/descendants_tracker.rb b/activesupport/lib/active_support/descendants_tracker.rb
index 21565138a7..b14842bf67 100644
--- a/activesupport/lib/active_support/descendants_tracker.rb
+++ b/activesupport/lib/active_support/descendants_tracker.rb
@@ -41,7 +41,6 @@ module ActiveSupport
       end
 
       private
-
         def accumulate_descendants(klass, acc)
           if direct_descendants = @@direct_descendants[klass]
             direct_descendants.each do |direct_descendant|
@@ -78,15 +77,17 @@ module ActiveSupport
       end
 
       def <<(klass)
-        cleanup!
         @refs << WeakRef.new(klass)
       end
 
       def each
-        @refs.each do |ref|
+        @refs.reject! do |ref|
           yield ref.__getobj__
+          false
         rescue WeakRef::RefError
+          true
         end
+        self
       end
 
       def refs_size