[strong] weak classes can't inherit from strong ones

test/mjsunit/strong/literals.js

Index: test/mjsunit/strong/literals.js
diff --git a/test/mjsunit/strong/literals.js b/test/mjsunit/strong/literals.js
index 28123c218ee1d7675f36164758378d7c25940c7c..347ea1ccacbd567296ab0952f110826df03032e1 100644
--- a/test/mjsunit/strong/literals.js
+++ b/test/mjsunit/strong/literals.js
@@ -285,24 +285,19 @@ let GeneratorPrototype = (function*(){}).__proto__;
   class D extends C {};
   class E extends Object {};
   // class F extends null {};
-  const S = (() => {'use strong'; return class {}})();
-  class G extends S {};
   assertWeakClass(C);
   assertWeakClass(D);
   assertWeakClass(E);
   // assertWeakClass(F);
-  assertWeakClass(G);
   assertWeakClass(class {});
   assertWeakClass(class extends Object {});
   // assertWeakClass(class extends null {});
   assertWeakClass(class extends C {});
-  assertWeakClass(class extends S {});
   assertWeakClass(class extends class {} {});
   assertWeakClass(class C {});
   assertWeakClass(class D extends Object {});
   // assertWeakClass(class D extends null {});
   assertWeakClass(class D extends C {});
-  assertWeakClass(class D extends S {});
   assertWeakClass(class D extends class {} {});
 })();