// downgraded to a non-conflicting version (possibly "none").
//
// If the resulting build list is the same as the one resulting from the last
// call to updateBuildList, updateBuildList returns with changed=false.
func (r *resolver) updateBuildList(ctx context.Context, additions []module.Version) (changed bool) {
	defer base.ExitIfErrors()

	resolved := make([]module.Version, 0, len(r.resolvedVersion))