demangle.go
func ToString(name string, options ...Option) (string, error) {
	a, err := ToAST(name, options...)
	if err != nil {
		return "", err
	}
	return ASTToString(a, options...), nil
}
func ToString(name string, options ...Option) (string, error) {
	a, err := ToAST(name, options...)
	if err != nil {
		return "", err
	}
	return ASTToString(a, options...), nil
}
// ToString demangles a C++ symbol name, returning human-readable C++
// name or an error.
// If the name does not appear to be a C++ symbol name at all, the
// error will be ErrNotMangledName.