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a guest Oct 22nd, 2019 70 Never
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  1. import Combine
  2. extension Publisher where Failure == Never {
  3.     func optionalAssign<Root>(to keyPath: ReferenceWritableKeyPath<Root, Optional<Output>>,
  4.                               on: Root) -> AnyCancellable {
  5.         map{let output:Output? = $0;return output}
  6.             .assign(to: keyPath, on: on)
  7.     }
  8. }
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