https://twitter.com/mattt/status/1055582012801613824

main.swift

let xs = [1, 2, 3, 4, 5]

for (element, index) in zip(xs, xs.indices) {
  if index == xs.startIndex {
    print("START")
  }

  print(element)

  if index == xs.index(before: xs.endIndex) {
    print("END")
  }
}

// Prints: "START\n1\n2\n3\n4\n5\nEND\n"

Line 10 should read index == xs.index(before: xs.endIndex)

if index == xs.index(before: xs.endIndex) {
    print("END")
}

Thank you, I missed that one.