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| extension Future { | |
| func then<U>(f: T -> Future<U>) -> Future<U> { | |
| let promise = Promise<U>() | |
| self.onFail { promise.fail() }.onSuccess { | |
| f($0).onFail { promise.fail() }.onSuccess { promise.resolve($0) } | |
| } | |
| return promise.future | |
| } | |
| } |
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