match.rs

fn source(&self) -> Option<&(dyn error::Error + 'static)> {
    match *self {
        Error::Transient(ref e) => Some(e),
        Error::Fatal(ref e) => Some(e),
    }
}

fn source(&self) -> Option<&(dyn error::Error + 'static)> {
    match self {
        &Error::Transient(ref e) => Some(e),
        &Error::Fatal(ref e) => Some(e),
    }
}

fn source(&self) -> Option<&(dyn error::Error + 'static)> {
    match self {
        Error::Transient(e) => Some(e),
        Error::Fatal(e) => Some(e),
    }
}