Limbs.bits_of: 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 207-211 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=207&end_line=211

import Base

# the k low bits of x, most significant first
def bits_of(k: Nat, +x: Nat) -> List<&2, Nat>:
  match k:
    case 0n: Nil{}
    case 1n+j: List.append(&2, Nat, bits_of(j, Nat.div(x, 2n)), [Nat.mod(x, 2n)])

Uses (5):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.append
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.div
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.mod