Macro factori::factori_builder

macro_rules! factori_builder {
    (
        $ty:ident, {
            default {
                $( $field_name:ident: $field_type:ty = $field_value:expr ),*
                $(,)*
            }

            builder |$builder_fields:ident| $builder:tt

            $(
                trait $trait_name:ident {
                    $( $trait_field:ident : $trait_value:expr ),*
                    $(,)*
                }
            )*
        }
    ) => { ... };
}