func (p *Package) InternalGoFiles() []string {
	return p.mkAbs(str.StringList(p.GoFiles, p.CgoFiles, p.TestGoFiles))
}

// InternalXGoFiles returns the list of Go files being built for the XTest package,
// using absolute paths.
func (p *Package) InternalXGoFiles() []string {
	return p.mkAbs(p.XTestGoFiles)
}

// InternalAllGoFiles returns the list of all Go files possibly relevant for the package,