def u64_bit_count
import bend-collections-laws-math@1.0.0.0/src/math/fixed.bend as Fixedimport Base
import bend-collections-laws-math@1.0.0.0/src/math/u64.bend as W
import bend-collections-laws-math@1.0.0.0/src/math/w64.bend as X
390def u64_bit_count(+x: W.U64) -> Nat:
391 Nat.add(u32_bit_count(X.lo(x)), u32_bit_count(X.hi(x)))