public static Surrogate targetLanguageType(Stella_Object tree) {
    if (Stella_Object.safePrimaryType(tree) == Stella.SGT_STELLA_CONS) {
      { Cons tree000 = ((Cons)(tree));

        if ((tree000.value == Stella.SYM_STELLA_TYPED_SYS) &&
            (tree000.length() == 4)) {
          return (((Surrogate)(tree000.fourth())));
        }
      }
    }
    else {
    }
    return (null);
  }