 @inline(never)
 public func appendToFromGeneric<
   R: RangeReplaceableCollection, S: Sequence
->(collection: inout R, sequence: S) 
+>(collection: inout R, sequence: S)
 where R.Element == S.Element {
   collection.append(contentsOf: sequence)
 }

  }
}

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

  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>]()
      for _ in 0..<8 {
        nums += other
      }
