}
	// Give up
	return nil, fmt.Errorf("could not create file of the form %s%03d%s", prefix, 1, suffix)
}

var tempFiles []string
var tempFilesMu = sync.Mutex{}

// deferDeleteTempFile marks a file to be deleted by next call to Cleanup()
func deferDeleteTempFile(path string) {
	tempFilesMu.Lock()
	tempFiles = append(tempFiles, path)
	tempFilesMu.Unlock()
}