Poly1305.mac: def of bend-collections-laws-crypto@1.0.0.0
Import: import bend-collections-laws-crypto@1.0.0.0/src/crypto/poly1305/poly1305.bend as Poly1305
Lines 66-71 of bend-collections-laws-crypto@1.0.0.0/src/crypto/poly1305/poly1305.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-crypto@1.0.0.0/src/crypto/poly1305/poly1305.bend&start_line=66&end_line=71

import Base

# The 16-byte tag of msg under key = r || s. (The match on msg only keeps a
# proof's goal small while msg is unknown; both arms are the same.)
def mac(+key: List<&2, U32>, +msg: List<&2, U32>) -> List<&2, U32>:
  match msg:
    case Nil{}: tag(key, [])
    case b <> rest: tag(key, b <> rest)

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=bend-collections-laws-crypto@1.0.0.0/src/crypto/poly1305/poly1305.bend&name=tag