Swift Evolution, Swift's API Design Guidelines are really good in my opinion, but I believe there is ambiguity with current trailing closure syntax.
Take for example if there were three variations of a `subscribe`function: func subscribe(onNext block: @escaping (Event) -> Void) { ... } func subscribe(onError block: @escaping (Event) -> Void) { ... } func subscribe(onCompleted block: @escaping (Event) -> Void) { ... } Since using subscribe with trailing closure syntax would cause ambiguity: subscribe { event in ... } The only option available is to call the function as normal: subscribe(onNext: { event in ... }) Since these functions are distinguished by their argument label, if a variation of trailing closure syntax were introduced that provided the option of using an argument label in parenthesis this ambiguity would disappear. something like this: subscribe(onNext:) { event in ... } would allow using trailing closure syntax in this case. Just a thought, I personally think having this change to the language would be worthwhile but would love to hear the community's opinion. - Nick
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