}
	if strings.HasPrefix(cwd, goroot) {
		subdir, err := filepath.Rel(goroot, cwd)
		if err != nil {
			return "", false, err
		}
		return subdir, true, nil
	}

	for _, p := range filepath.SplitList(build.Default.GOPATH) {
		pabs, err := filepath.EvalSymlinks(p)
		if err != nil {
			return "", false, err
		}
		if !strings.HasPrefix(cwd, pabs) {
			continue
		}
		subdir, err := filepath.Rel(pabs, cwd)