1 R1.run() invoked
   2 R2.run() invoked
   3 r3.run() invoked
   4 r1.class !== r2.class: true
   5 r2.class !== r3.class: true
   6 Got exception: java.lang.UnsupportedOperationException
   7 Got exception: java.lang.UnsupportedOperationException
   8 (new ExtendsList).size() = 0
   9 (new (Java.extend(ExtendsList)){}).size() = 0