func NewSource(base, inner *File, includes []*File) *source {
	return &source{
		base:     base,
		inner:    inner,
		includes: includes,
	}
}
func NewSource(base, inner *File, includes []*File) *source {
	return &source{
		base:     base,
		inner:    inner,
		includes: includes,
	}
}
func NewSource ( base , inner * File , includes [ ] * File ) * source { return & source { base : base , inner : inner , includes : includes , } }
// NewSource creates and returns source.
NewSource creates and returns source .