Macro etrace::new_err_from

macro_rules! new_err_from {
    ($kind:expr, $description:expr) => { ... };
    ($kind:expr) => { ... };
}

Creates a new error by converting kind into the matching Error<T> (using a From-trait) and returns it (return Err(Error<T>))

Use new_err_from!(kind) to create an error with an automatically created description or use new_err_from!(kind, description) to provide an explicit description