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Swift result type
enum Result<T, ErrorType> {
case success(T)
case error(ErrorType)
enum MyError: ErrorType {
case itFuckedUp
// no longer need unused parameters in completion blocks:
func doSomething(completionHandler: () -> (Result<String, NSError>)) {
if itWorks {
completionHandler(.success("it worked"))
} else {
doSomething { result in
switch(result) {
case .success(let result) {
case .error(let error) {
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