func IsFileNotFoundErr(err error) bool {
	if err == nil {
		return false
	}
	return fileNotFoundRe.MatchString(err.Error())
}
func IsFileNotFoundErr(err error) bool {
	if err == nil {
		return false
	}
	return fileNotFoundRe.MatchString(err.Error())
}
func IsFileNotFoundErr ( err error ) bool { if err == nil { return false } return fileNotFoundRe . MatchString ( err . Error ( ) ) }
// IsFileNotFoundErr returns true if 'err' is an error message about a PFS
// file not being found
IsFileNotFoundErr returns true if err is an error message about a PFS file not being found