code: @Override
      public void visitLocalVariable(String name, String desc, String signature, Label start, Label end, int index) {
          if (index < firstNonParameterSlot) {
              start = methodEntryLabel;
          }
          super.visitLocalVariable(name, desc, signature, start, end, index);
      }
docs: Visit a local variable. We will use this to change the start label
  for method parameters references.