code: public void visitOpen(String packaze, int access, String... modules) {
          if (mv != null) {
              mv.visitOpen(packaze, access, modules);
          }
      }
docs: Visit an open package of the current module.
  
  @param packaze the qualified name of the opened package.
  @param access the access flag of the opened package,
  valid values are among {@code ACC_SYNTHETIC} and
  {@code ACC_MANDATED}.
  @param modules the qualified names of the modules that can use deep
  reflection to the classes of the open package or
  <tt>null</tt>.