Derive Macro macro_rules_attribute::Custom

#[derive(Custom)]
{
    // Attributes available to this derive:
    #[custom]
    #[derive_args]
}

No-op macro that is automatically derived with derive or macro_rules_derive to allow using the #[custom(...)] and #[derive_args(...)] attribute.

See https://github.com/danielhenrymantilla/macro_rules_attribute-rs/issues/9 for more info.