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