anchor.diff:          else
             { Status = Exhausted; Succeeded = s1 + s2; Discarded = d1 + d2; FreqMap = FreqMap.append fm1 fm2; Time = 0L }
   
  -    let start = DateTime.UtcNow.Ticks
  +    let watch = Stopwatch.StartNew()
   
       let r =
         if prms.Workers < 2 then workerFun 0
  
positive.code:         finally
            stop := true
  
      let timedRes = { r with Time = DateTime.UtcNow.Ticks - start }
      prms.Callback.OnTestResult("", timedRes)
      timedRes
  
  
negative.code: 
  module private Impl =
  
    open System.Diagnostics
  
    let assertParams prms =
      if prms.MinSuccessfulTests <= 0 then
  