Number.BitCount.value: def of bend-collections-laws-math@1.0.0.0
Import: import bend-collections-laws-math@1.0.0.0/spec/math/number.bend as Number
Lines 28-30 of bend-collections-laws-math@1.0.0.0/spec/math/number.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-math@1.0.0.0/spec/math/number.bend&start_line=28&end_line=30

import Base
import bend-collections-laws-math@1.0.0.0/src/math/number.bend as NB

# every n is below 2^n, so ones(n, n) counts all of n's 1 bits
def BitCount.value(+n: Nat) -> Type:
  {NB.bit_count(n) == ones(n, n) : Nat}

Uses (3):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/spec/math/number.bend&name=ones
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/src/math/number.bend&name=bit_count