anchor.diff:                          res.snd <- arr.[1]
                           if arr.Length > 2 then
                               res.other <- arr.[2..]
  -            {fst = res.fst; snd = res.snd; other = res.other; extension = int64 -1}
  +            {fst = res.fst; snd = res.snd; other = res.other; extension = e}
   
   
           member nodes.doForAll f =
  
positive.code:     struct
          val prod : int
          val nodes : Nodes
          val extension : Int64
          new (p,n) = {prod = p; nodes = n; extension = int64 -1}
          new (p,n, l, r) = {prod = p; nodes = n; extension = int64 -1}
      end
  
  and Nodes =
  
negative.code:         val mutable other : obj[]
          val extension : Int64
          new (f,s,o) = {fst = f; snd = s; other = o; extension = int64 -1}
          new (f, s, o, e) = {fst = f; snd = s; other = o; extension = e}
  
          new (arr : array<_>) =
              let mutable res = new Nodes()
  