anchor.diff:            raise <| 
               new FsiEvaluationException(
                 "Error while creating a fsi session.",
  -              sprintf "Fsi Arguments: %A" args,
  +              sprintf "Fsi Arguments: %s" (Log.formatArgs args),
                 { Output = out; Error = err },
                 e)
       
  
positive.code:   let warnf f = traceEventf TraceEventType.Warning f
    let critf f = traceEventf TraceEventType.Critical f
    let verbf f = traceEventf TraceEventType.Verbose f
  
  open Env
  [<AutoOpen>]
  
negative.code:         match tried |> Seq.tryPick tryCheckFsCore with
          | Some s -> s
          | None -> 
              let paths = Log.formatPaths tried
              Log.critf "Could not find a FSharp.Core.dll (with bundled .optdata and .sigdata) in %s" paths
              failwithf "Could not find a FSharp.Core.dll (with bundled .optdata and .sigdata) in %s" paths
  
        let getProjectReferences otherFlags libDirs dllFiles =
            let otherFlags = defaultArg otherFlags Seq.empty
  