// PathError records an error and the operation and file path that caused it.
type PathError struct {
	Op string    // "open", "unlink", etc.
	Path string  // The associated file.
	Err error  // Returned by the system call.
}

func (e *PathError) String() string {
	return e.Op + " " + e.Path + ": "+ e.Err.Error()
}