anchor.diff:      | Delayed of (unit -> LazyListCell<'T>)
       //
       | Value of LazyListCell<'T>
  +#if FX_ATLEAST_45
  +    //
  +    | Exception of ExceptionDispatchInfo
  +#else
       //
       | Exception of exn
  +#endif
   
   //
   and [<NoEquality; NoComparison>]
  
positive.code: open System.Collections.Generic
  open ExtCore
  
  #nowarn "21" // recursive initialization
  #nowarn "40" // recursive initialization
  
  
negative.code:     static let undefinedValue =
          System.InvalidOperationException "The value of the LazyList cell is undefined."
          :> exn
          #if FX_ATLEAST_45
          |> ExceptionDispatchInfo.Capture
          #endif
          |> Exception
  
      //
  