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| enum Result<T> { | |
| case Success(T) | |
| case Error(NSError) | |
| } | |
| func listMessages(completion: Result<[Message]> -> Void) { | |
| // Get the list of messages | |
| // If success, call completion(Result.Success(messages)) | |
| // If error, call completion(Result.Error(error)) | |
| } |
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