pub type P63 = PInt<U63>;
struct P63 { pub(crate) n: UInt<UInt<UInt<UInt<UInt<UInt<UTerm, B1>, B1>, B1>, B1>, B1>, B1>, }
n: UInt<UInt<UInt<UInt<UInt<UInt<UTerm, B1>, B1>, B1>, B1>, B1>, B1>