Macro with_error 

macro_rules! with_error {
    (
        $(#[$enum_meta:meta])*
        $enum_vis:vis enum $enum_name:ident {
            $(
                $(#[$variant_meta:meta])*
                $variant_name:ident = $string:literal $(| $alias:literal)* $(= $discriminant:expr)?
            ),* $(,)?
        }
        throws
        $(#[$error_meta:meta])*
        $error_name:ident $(;)?
    ) => { ... };
}

Like strum!, but also declares a custom zero-sized error type, rather than using the pointer-wide ParseError.

The error type will implement Debug, Display, and Error, as well as custom derives.

strum_lite::with_error! {
    #[derive(Default)]
    pub enum Casing {
        Kebab = "kebab-case" | "kebab",
        #[default]
        ScreamingSnake = "SCREAMING_SNAKE",
    }
    throws #[derive(Default)] ParseCasingError;
}

See crate documentation for more.

You are encouraged to copy-paste this macro into your own code.