valuable-derive 0.1.1

Macros for the `valuable` crate.
Documentation 
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macro_rules! format_err {
    ($span:expr, $msg:expr $(,)?) => {
        syn::Error::new_spanned(&$span as &dyn quote::ToTokens, &$msg as &dyn std::fmt::Display)
    };
    ($span:expr, $($tt:tt)*) => {
        format_err!($span, format!($($tt)*))
    };
}