# when $out/nix-support/failed exists, build actually failed, exit code is in the file, status code for such builds is 6
                    $stepStatus = 6 if -f "$stepOutpath/nix-support/failed";
                    $thisBuildFailed = 1 if ($drvPath eq $drvPathStep && $stepStatus == 6);

        } else {
          $buildStatus = 6 if $thisBuildFailed;
        }

        } 

        if ($buildStatus == 0 && -f "$outPath/nix-support/failed") { 
            $buildStatus = 6; 
        }