code: public static Error neverGetHereError(String msg, Object... values) {
      getProvider().neverGetHerePolicy().neverGetHere(NO_CAUSE, describing(msg, values));
      return DEFAULT_ERROR;
    }
docs: Unreachable code have been reached. This is
  considered to be a programming error.
  
  @param msg    message {@link java.lang.String#format format string}
  @param values values passed into the msg format string
  @return an error