func ParseLinkFuncName(name string) (pkg, sym string, err error) {
	pkg, sym = splitPkg(name)
	if pkg == "" {
		return "", "", fmt.Errorf("no package path in name")
	}

	pkg, err = objabi.PrefixToPath(pkg) // unescape
	if err != nil {
		return "", "", fmt.Errorf("malformed package path: %v", err)
	}

	return pkg, sym, nil
}

// Borrowed from x/mod.
func modPathOK(r rune) bool {