Macro cookie_factory::gen_le_u32

macro_rules! gen_le_u32 {
    (($i:expr, $idx:expr), $val:expr) => { ... };
    ($i:expr, $val:expr) => { ... };
}

gen_le_u32!(I, u8) => I -> Result<I,E> Write an unsigned 4 bytes integer (using little-endian order).