let backtrace = backtrace_if_absent!(error);
        Error::from_std(error, backtrace)
    }
    pub(crate) fn from_std<E>(error: E, backtrace: Option<Backtrace>) -> Self
    where
        E: StdError + Send + Sync + 'static,
    {

        let backtrace = backtrace_if_absent!(error);

    pub(crate) fn new_adhoc<M>(message: M, backtrace: Option<Backtrace>) -> Self

    pub(crate) fn from_adhoc<M>(message: M, backtrace: Option<Backtrace>) -> Self

        Error::new_adhoc(message, backtrace!())

        Error::from_adhoc(message, backtrace!())