sources            []Visitor
	singleItemImplied  bool
	targetsSingleItems bool

	mapper       *mapper
	ignoreErrors []utilerrors.Matcher

	// populated by a call to Infos
	info []*Info
}

// withError allows a fluent style for internal result code.
func (r *Result) withError(err error) *Result {
	r.err = err
	return r
}

// TargetsSingleItems returns true if any of the builder arguments pointed