| // RUN: not %target-swift-frontend %s -parse | |
| // Distributed under the terms of the MIT license | |
| // Test case submitted to project by https://github.com/zneak (zneak) | |
| protocol A { typealias B } | |
| class C : A { typealias B = Int } | |
| func crash<D: C>() -> Bool { | |
| let a: D.B? = nil | |
| } |