Limbs.cbits: def of bend-collections-laws-crypto@1.0.0.0
Import: import bend-collections-laws-crypto@1.0.0.0/src/crypto/secp256k1/limbs.bend as Limbs
Lines 213-217 of bend-collections-laws-crypto@1.0.0.0/src/crypto/secp256k1/limbs.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-crypto@1.0.0.0/src/crypto/secp256k1/limbs.bend&start_line=213&end_line=217

import Base

# every bit flipped: the bits of 2^k - 1 - x from those of x
def cbits(bs: List<&2, Nat>) -> List<&2, Nat>:
  match bs:
    case Nil{}: Nil{}
    case b <> t: Nat.sub(1n, b) <> cbits(t)

Uses (3):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.sub