Incremental.fold3: def of bend-collections-laws-crypto@1.0.0.0
Import: import bend-collections-laws-crypto@1.0.0.0/proofs/crypto/hash/incremental.bend as Incremental
Lines 983-989 of bend-collections-laws-crypto@1.0.0.0/proofs/crypto/hash/incremental.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-crypto@1.0.0.0/proofs/crypto/hash/incremental.bend&start_line=983&end_line=989

import Base
import bend-collections-laws-crypto@1.0.0.0/src/crypto/hash.bend as H

# The state after each chunk in turn.
def fold3(cs: List<&2, List<&2, U32>>, +q: Nat, st: H.Sha3State) -> H.Sha3State:
  match cs:
    case Nil{}:
      st
    case c <> ct:
      fold3(ct, q, H.step3(st, c, q))

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=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/src/crypto/hash.bend&name=Sha3State
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/src/crypto/hash.bend&name=step3