anchor.diff:  
   
   [<Test>]
  -let ``try with should catch exception in the body``() =
  -   let task = Task.TaskBuilder(continuationOptions = TaskContinuationOptions.ExecuteSynchronously)
  +let ``try with should catch exception in the body``() =   
      let result = task {
         try 
            failwith "exception"
  
positive.code: 
  [<Test>]
  let ``while``() = 
      let i = ref 10    
      let task = Task.TaskBuilder(continuationOptions = TaskContinuationOptions.ExecuteSynchronously)
      let t() =
          task {
              while !i > 0 do
  
negative.code: 
  
  [<Test>]
  let ``try with should catch exception only by type``() =   
     let result = task {
        try 
           invalidArg "param name" "msg"
  