code: func MustParseEtcdStorageVersion(s string) EtcdStorageVersion {
  	version, err := ParseEtcdStorageVersion(s)
  	if err != nil {
  		panic(err)
  	}
  	return version
  }
docs: // MustParseEtcdStorageVersion parses an etcd storage version string to an EtcdStorageVersion and
  // panics if the parse fails.