Singleton classes can't have subclasses.

rubinius · Apr 25, 2016 · 20938ee · 20938ee
1 parent 8ce1f68
commit 20938ee
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/machine/builtin/module.cpp b/machine/builtin/module.cpp
@@ -490,10 +490,13 @@ namespace rubinius {
   }
 
   Object* Module::track_subclass(STATE, Module* mod) {
+    if(try_as<SingletonClass>(mod)) return cNil;
+
     if(hierarchy_subclasses()->nil_p()) {
       hierarchy_subclasses(state, Array::create(state, 4));
     }
     hierarchy_subclasses()->append(state, WeakRef::create(state, mod));
+
     return cNil;
   }