| // RUN: not %target-swift-frontend -emit-ir %s | |
| protocol ObservableType { | |
| associatedtype E | |
| } | |
| extension ObservableType where E == Any { | |
| static func zip<O1>(_ source1: O1) { fatalError() } | |
| } | |
| extension ObservableType { | |
| static func zip<O1, O2>(_ source1: O1, _ source2: O2) { fatalError() } | |
| } | |
| class Observable<Element> : ObservableType { | |
| public typealias E = Element | |
| } | |
| Observable.zip(1, 2) |