Bytes.at.fin: def of lawful-bytes@0.1.1.0
Import: import lawful-bytes@0.1.1.0/bytes.bend as Bytes
Lines 15-17 of lawful-bytes@0.1.1.0/bytes.bend: https://jend.leeeet.dev/read.txt?path=lawful-bytes@0.1.1.0/bytes.bend&start_line=15&end_line=17

import Base
import lawful-words@0.1.0.0/defs.bend as W
import lawful-bytes@0.1.1.0/defs.bend as D

def at.fin(+len: U32, +i: U32, r: Array<U32> & U32) -> D.Bytes & U32:
  (buf, +w) = r
  (D.Bytes{len, buf}, W.byte(w, U32.to_nat((i .&. 3 : U32))))

Uses (8):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Array
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Sigma
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.and
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.to_nat
  https://jend.leeeet.dev/definition.txt?path=lawful-bytes@0.1.1.0/defs.bend&name=Bytes
  https://jend.leeeet.dev/definition.txt?path=lawful-words@0.1.0.0/defs.bend&name=byte