Macro userobject 

macro_rules! userobject {
    (
        $name:ident : $typ_name:literal ;
        $self:ident
        $(static ($fn_self:ident, $fn_args:ident) { $(
            $fn_name:ident : $fn_literal_name:literal $fn_body:block
        ) *})?
        $(mut ($fn_mut_self:ident, $fn_mut_args:ident) { $(
            $fn_mut_name:ident : $fn_mut_literal_name:literal $fn_mut_body:block
        ) *})?
    ) => { ... };
}