| // This source file is part of the Swift.org open source project |
| // |
| // Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors |
| // Licensed under Apache License v2.0 with Runtime Library Exception |
| // |
| // See https://swift.org/LICENSE.txt for license information |
| // See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors |
| |
| // RUN: %target-swift-frontend %s -typecheck -verify |
| |
| // Issue found by https://github.com/jvasileff (John Vasileff) |
| // This bug is NOT triggered when compiling with -O. |
| |
| protocol BooleanProtocol { |
| var boolValue: Bool { get } |
| } |
| extension Bool : BooleanProtocol { |
| var boolValue: Bool { return self } |
| } |
| func f<T : BooleanProtocol>(_ b: T) { |
| } |
| f(true as BooleanProtocol) // expected-error {{protocol type 'BooleanProtocol' cannot conform to 'BooleanProtocol' because only concrete types can conform to protocols}} |
