Field.addl: def of bend-collections@1.0.0.0
Import: import bend-collections@1.0.0.0/src/crypto/curve25519/field.bend as Field
Lines 26-36 of bend-collections@1.0.0.0/src/crypto/curve25519/field.bend: https://jend.leeeet.dev/read.txt?path=bend-collections@1.0.0.0/src/crypto/curve25519/field.bend&start_line=26&end_line=36

import Base

# limbwise sum; the longer tail is kept
def addl(xs: List<&2, U32>, ys: List<&2, U32>) -> List<&2, U32>:
  match xs:
    case Nil{}:
      ys
    case Con{x, xt}:
      match ys:
        case Nil{}:
          Con{x, xt}
        case Con{y, yt}:
          Con{U32.add(x, y), addl(xt, yt)}

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