   let other = Array(repeating: S(x: 3, y: 4.2), count: 10_000)
   for _ in 0..<N {
     for _ in 0..<10 {
-      var nums = [S<Int,Double>]()
+      var nums = [S<Int, Double>]()
       for _ in 0..<8 {
         nums += other
       }

  }
}

// Append the utf8 elements of an ascii string to a [UInt8]
@inline(never)
public func run_ArrayAppendLatin1Substring(_ N: Int) {
  let s = "the quick brown fox jumps over the lazy dog\u{00A1}"[...]

}

// Append a sequence. Length of sequence unknown so
// can't pre-reserve capacity.
@inline(never)
public func run_ArrayAppendSequence(_ N: Int) {
  let seq = stride(from: 0, to: 10_000, by: 1)

  for _ in 0..<N {
    for _ in 0..<10 {
      var nums = [Int]()
