errify 0.3.0

Function error context provider
Documentation 
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// Not public API
#[doc(hidden)]
#[macro_export]
macro_rules! format_cx {
    ($msg:literal $(,)?) => {
        $crate::__private::format_err(format_args!($msg))
    };
    ($fmt:expr, $($arg:tt)*) => {
        $crate::__private::Cow::<'static, str>::Owned($crate::__private::format!($fmt, $($arg)*))
    };
}

#[cfg(test)]
mod tests {
    use alloc::borrow::Cow;

    #[test]
    fn literal() {
        let cx = format_cx!("literal");
        assert_eq!(cx, Cow::Borrowed("literal"));
    }

    #[test]
    fn format_string() {
        let external_named = 1;
        let cx = format_cx!("format string {external_named}");
        assert_eq!(cx, Cow::<'static, str>::Owned("format string 1".to_owned()));

        let external_named = 1;
        let cx = format_cx!(
            "format string {external_named} {internal_named} {}",
            3,
            internal_named = 2
        );
        assert_eq!(
            cx,
            Cow::<'static, str>::Owned("format string 1 2 3".to_owned())
        );
    }
}