anchor.diff:  let filename = @"table.csv"
   
   [<Test>]
  -let loadprices() =
  +let loadprices() =    
  +    let task = Task.TaskBuilder(continuationOptions = TaskContinuationOptions.ExecuteSynchronously)
       let started = ref false
       let dummy = ref false
       let processTask() =
  
positive.code:     Assert.True !started
  
  [<Test>]
  let ``exception in task``() =
      let t() = 
          task {
              failwith "error"
  
negative.code: 
  [<Test>]
  let ``while``() = 
      let i = ref 10    
      let task = Task.TaskBuilder(continuationOptions = TaskContinuationOptions.ExecuteSynchronously)
      let t() =
          task {
              while !i > 0 do
  