code: public static void f(Object o) {
          if (o != null && !(o instanceof Class<?>)) {
              t(o.getClass());
          }
      }
docs: Touch method. This method is invoked when a static field is read. We need
  this method as the type of the filed may be declared private (e.g., inner
  class), so we need a way to get that type; unfortunately, we cannot use
  class literal, as we get java.lang.IllegalAccessError. Note that this
  method is invoked only for GETFIELD as for test selection PUTFIELD may
  not matter.