Limbs.fold: def of bend-collections@1.0.0.0
Import: import bend-collections@1.0.0.0/src/crypto/secp256k1/limbs.bend as Limbs
Lines 133-135 of bend-collections@1.0.0.0/src/crypto/secp256k1/limbs.bend: https://jend.leeeet.dev/read.txt?path=bend-collections@1.0.0.0/src/crypto/secp256k1/limbs.bend&start_line=133&end_line=135

import Base

# lo + c hi, for x = lo + 2^256 hi: congruent to x modulo m
def fold(+c: List<&2, Nat>, +xs: List<&2, Nat>) -> List<&2, Nat>:
  add(take(16n, xs), conv(drop(16n, xs), c))

Uses (6):
  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=bend-collections@1.0.0.0/src/crypto/secp256k1/limbs.bend&name=add
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/crypto/secp256k1/limbs.bend&name=conv
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/crypto/secp256k1/limbs.bend&name=drop
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/crypto/secp256k1/limbs.bend&name=take