Created
April 3, 2018 00:28
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Xcode 9.3 protocol conformance bug
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| //: Playground - noun: a place where people can play | |
| import UIKit | |
| protocol ViewControllerProvider { | |
| func createViewController() -> UIViewController | |
| } | |
| protocol HasProvider { | |
| associatedtype Provider: ViewControllerProvider | |
| var provider: Provider! { get set } | |
| } | |
| protocol SpecialProvider { | |
| associatedtype ViewController: UIViewController, HasProvider | |
| } | |
| extension SpecialProvider where ViewController.Provider == Self { | |
| func createViewController() -> UIViewController { | |
| var vc = ViewController.init() | |
| vc.provider = self | |
| return vc | |
| } | |
| } | |
| class ConcreteViewController: UIViewController, HasProvider { | |
| typealias Provider = ConcreteProvider | |
| var provider: Provider! | |
| } | |
| class ConcreteProvider: SpecialProvider, ViewControllerProvider { | |
| typealias ViewController = ConcreteViewController | |
| } | |
| let provider = ConcreteProvider() | |
| let controller = provider.createViewController() | |
| //Playground execution failed: | |
| // | |
| //error: Playground.playground:26:7: error: type 'ConcreteProvider' does not conform to protocol 'ViewControllerProvider' | |
| //class ConcreteProvider: SpecialProvider, ViewControllerProvider { | |
| // ^ | |
| // | |
| // Playground.playground:14:10: note: candidate has non-matching type '<Self> () -> UIViewController' | |
| // func createViewController() -> UIViewController { | |
| //^ | |
| // |
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