anchor.diff:  @REM and allow the "-priority=1" syntax.
   set __Priority=0
   set __PriorityArg=
  +set __PassThroughArg=
   
   :Arg_Loop
   if "%1" == "" goto ArgsDone
  
positive.code: set __MsbuildErr=/flp2:ErrorsOnly;LogFile="%__BuildErr%"
  set __Logging=-MsBuildLog=!__MsbuildLog! -MsBuildWrn=!__MsbuildWrn! -MsBuildErr=!__MsbuildErr!
  
  call %__ProjectDir%\run.cmd build -Project=%__ProjectDir%\tests\runtest.proj -testHost !__Logging! %__RunArgs% %RuntimeIdArg% %__PriorityArg% %__UnprocessedBuildArgs%
  if errorlevel 1 (
      echo %__MsgPrefix%Error: build failed. Refer to the build log files for details:
      echo     %__BuildLog%
  
negative.code: set __MsbuildErr=/flp2:ErrorsOnly;LogFile="%__BuildErr%"
  set __Logging=-MsBuildLog=!__MsbuildLog! -MsBuildWrn=!__MsbuildWrn! -MsBuildErr=!__MsbuildErr!
  
  call %__ProjectDir%\run.cmd build -Project=%__ProjectDir%\tests\helixprep.proj !__Logging! %__RunArgs% %__BuildAgainstPackagesArg% %RuntimeIdArg% %TargetsWindowsArg% %__CrossgenArg% %__PriorityArg% %__PassThroughArg% %__UnprocessedBuildArgs%
  if errorlevel 1 (
      echo %__MsgPrefix%Error: build failed. Refer to the build log files for details:
      echo     %__BuildLog%
  