docs: private boolean isEmptyImplementation(MethodGen methodGen){
          boolean invokeInst = false;
          boolean loadField = false;
  
          for (Iterator itIns = methodGen.getInstructionList().iterator();itIns.hasNext();) {
              Instruction inst = ((InstructionHandle) itIns.next()).getInstruction();
              if (DEBUG)
                  System.out.println(inst.toString(true));
  
              if (inst instanceof InvokeInstruction) {
                  invokeInst = true;
              }
              if (inst instanceof GETFIELD) {
                  loadField = true;
              }
          }
          return !invokeInst && !loadField;
      }