// of rs, unless the selected version for the module path is "none".
func editRequirements(ctx context.Context, rs *Requirements, tryUpgrade, mustSelect []module.Version) (edited *Requirements, changed bool, err error) {
	if rs.pruning == workspace {
		panic("editRequirements cannot edit workspace requirements")
	}

	orig := rs

// in the build list may have been changed (possibly to or from "none") as a
// result.
func EditBuildList(ctx context.Context, add, mustSelect []module.Version) (changed bool, err error) {
	rs, changed, err := editRequirements(ctx, LoadModFile(ctx), add, mustSelect)
	if err != nil {
		return false, err
	}
	requirements = rs
	return changed, err
}