pub type U11 = UInt<UInt<UInt<UInt<UTerm, B1>, B0>, B1>, B1>;
struct U11 { pub(crate) msb: UInt<UInt<UInt<UTerm, B1>, B0>, B1>, pub(crate) lsb: B1, }
msb: UInt<UInt<UInt<UTerm, B1>, B0>, B1>
lsb: B1