func (gc *goConfig) preprocessTags() {
	if gc.genericTags == nil {
		gc.genericTags = make(map[string]bool)
	}
	gc.genericTags["gc"] = true
}
func (gc *goConfig) preprocessTags() {
	if gc.genericTags == nil {
		gc.genericTags = make(map[string]bool)
	}
	gc.genericTags["gc"] = true
}
// preprocessTags adds some tags which are on by default before they are
// used to match files.