X25519.bitlen: def of bend-collections@1.0.0.0
Import: import bend-collections@1.0.0.0/src/crypto/curve25519/x25519.bend as X25519
Lines 98-104 of bend-collections@1.0.0.0/src/crypto/curve25519/x25519.bend: https://jend.leeeet.dev/read.txt?path=bend-collections@1.0.0.0/src/crypto/curve25519/x25519.bend&start_line=98&end_line=104

import Base

# 8 len(xs), the bit count of a byte string
def bitlen(xs: List<&2, U32>) -> Nat:
  match xs:
    case Nil{}:
      0n
    case Con{x, xt}:
      Nat.add(8n, bitlen(xt))

Uses (4):
  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.add
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32