anchor.diff:  let checker = InteractiveChecker.Create()
   let compiler = new SimpleSourceCodeServices()
   
  +/// Ensures the default FSharp.Core referenced by the F# compiler service (if none is 
  +/// provided explicitly) is available in the output directory.
  +let ensureDefaultFSharpCoreAvailable tmpDir  =
  +    // FSharp.Compiler.Service references FSharp.Core 4.3.0.0 by default.  That's wrong? But the output won't verify
  +    // or run on a system without FSharp.Core 4.3.0.0 in the GAC or in the same directory, or with a binding redirect in place.
  +    // 
  +    // So just copy the FSharp.Core 4.3.0.0 to the tmp directory. Only need to do this on Windows.
  +    if System.Environment.OSVersion.Platform = System.PlatformID.Win32NT then // file references only valid on Windows 
  +        File.Copy(fsCore4300(), Path.Combine(tmpDir, Path.GetFileName(fsCore4300())), overwrite = true)
  +
   let compile isDll debugMode (assemblyName : string) (code : string) (dependencies : string list) =
       let tmp = Path.GetTempPath()
       let sourceFile = Path.Combine(tmp, assemblyName + ".fs")
  
positive.code: open Microsoft.FSharp.Compiler.SourceCodeServices
  open Microsoft.FSharp.Compiler.SimpleSourceCodeServices
  open FSharp.Compiler.Service.Tests
  
  open NUnit.Framework
  
  
negative.code:     
      let outFile = Path.Combine(outDir, name + ".dll")
  
      ensureDefaultFSharpCoreAvailable outDir
  
      let errors, id = compiler.Compile(ast, name, outFile, references, executable = false)
      for err in errors do printfn "error: %A" err
      Assert.AreEqual (errors.Length, 0)
  