anchor.diff:      let ei = e.ToCharArray().GetEnumerator()
       let mutable i = 0
       let baseMsg errorIndex =
  -      let diffString = new String(' ', errorIndex + 1) + "↑"
  +      let diffString = String(' ', errorIndex + 1) + "↑"
         sprintf "%s.
             Expected string to equal:
             %A
  
positive.code:       Tests.failtestf "%s
            String `actual` was longer than expected, at pos %i found item %A."
                        (baseMsg i) i (ai.Current)
    | _, _ ->
      if actual <> expected then
        Tests.failtestf "%s. Actual value was %A but had expected it to be %A." message actual expected
  
negative.code:     Tests.failtestf "%s. Expected expected to not be infinity, but it was." message
    elif Accuracy.areClose accuracy actual expected |> not then
      Tests.failtestf
        "%s. Expected difference to be less than %f for accuracy {absolute=%f; relative=%f}, but was %f. actual=%f expected=%f"
        message (Accuracy.areCloseRhs accuracy actual expected)
        accuracy.absolute accuracy.relative
        (Accuracy.areCloseLhs actual expected)
  