Limbs.mul: def of bend-collections@1.0.0.0
Import: import bend-collections@1.0.0.0/src/crypto/poly1305/limbs.bend as Limbs
Lines 38-42 of bend-collections@1.0.0.0/src/crypto/poly1305/limbs.bend: https://jend.leeeet.dev/read.txt?path=bend-collections@1.0.0.0/src/crypto/poly1305/limbs.bend&start_line=38&end_line=42

import Base

# Schoolbook product, no carries: x r0 + 2^8 (x r1 + 2^8 (...)).
def mul(+x: List<&2, U32>, r: List<&2, U32>) -> List<&2, U32>:
  match r:
    case Nil{}: Nil{}
    case r0 <> rs: add(scale(r0, x), 0 <> mul(x, rs))

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=U32
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/crypto/poly1305/limbs.bend&name=add
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/crypto/poly1305/limbs.bend&name=scale