anchor.diff:  
   open System.IO
   open System.Collections.Generic
  +open System.Runtime.InteropServices
   open Internal.Utilities
   open FSharp.Compiler.AbstractIL.Internal 
   open FSharp.Compiler.AbstractIL.Internal.Library
  
positive.code: 
      let EnsureSufficientExecutionStack recursionDepth =
          if recursionDepth > MaxUncheckedRecursionDepth then
              RuntimeHelpers.EnsureSufficientExecutionStack ()
negative.code:     // Translation of C# from http://swikb/v1/DisplayOnlineDoc.aspx?entryID=826 and copy in bug://5018
      [<System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Assert, UnmanagedCode = true)>] 
      let EnableHeapTerminationOnCorruption() =
          if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows) &&  System.Environment.OSVersion.Version.Major >= 6 && // If OS is Vista or higher
              System.Environment.Version.Major < 3) then // and CLR not 3.0 or higher 
              // "The flag HeapSetInformation sets is available in Windows XP SP3 and later.
              //  The data structure used for heap information is available on earlier versions of Windows.
  