}

	err := lockedfile.Transform(GoSumFile, func(data []byte) ([]byte, error) {
		tidyGoSum := tidyGoSum(data, keep)
		return tidyGoSum, nil
	})

	if err != nil {
		return fmt.Errorf("updating go.sum: %w", err)
	}

	goSum.status = make(map[modSum]modSumStatus)
	goSum.overwrite = false
	return nil
}

// TidyGoSum returns a tidy version of the go.sum file.
// A missing go.sum file is treated as if empty.

			if gover.Compare(compatVersion, "1.16") > 0 {
				keep = keepSums(ctx, loaded, requirements, addBuildListZipSums)
			}
			currentGoSum, tidyGoSum := modfetch.TidyGoSum(keep)
			goSumDiff := diff.Diff("current/go.sum", currentGoSum, "tidy/go.sum", tidyGoSum)

			if len(goModDiff) > 0 {
				fmt.Println(string(goModDiff))
				base.SetExitStatus(1)
			}
			if len(goSumDiff) > 0 {