protocol_conformance_collision.swift

// RUN: %empty-directory(%t)
// RUN: %target-build-swift %s -o %t/newSDK %target-link-sdk-2021-version
// RUN: %target-codesign %t/newSDK
// RUN: %target-run %t/newSDK newSDK
// RUN: %target-build-swift %s -o %t/oldSDK %target-link-sdk-2020-version
// RUN: %target-codesign %t/oldSDK
// RUN: %target-run %t/oldSDK oldSDK

// REQUIRES: VENDOR=apple
// REQUIRES: executable_test

// Simulators refuse to run binaries built with an SDK newer than the simulator.
// UNSUPPORTED: DARWIN_SIMULATOR=ios
// UNSUPPORTED: DARWIN_SIMULATOR=tvos
// UNSUPPORTED: DARWIN_SIMULATOR=watchos
// UNSUPPORTED: DARWIN_SIMULATOR=xros

// UNSUPPORTED: use_os_stdlib
// UNSUPPORTED: back_deployment_runtime

import Accelerate
import Foundation
import StdlibUnittest
import SwiftShims


extensionCFString:Hashable{
staticvarlocalHashableCallCount=0
publicvarhashValue:Int{
Self.localHashableCallCount +=1
return(selfasString).hashValue
}
}

protocolP{
func firstHashValue()->Int
}

extensionSet:P{
func firstHashValue()->Int{
return first!.hashValue
}
}

@_optimize(none)
func firstHashValue(_ x:P)->Int{
 x.firstHashValue()
}

letosHasWorkaround:Bool
// These are deliberately not the standard 9999, as we don't want to hit the
// special case where it's always available, and we don't want this check to be
// rewritten in any find/replace operations.
if #available(macOS 9998, iOS 9998, tvOS 9998, watchOS 9998,*){
 osHasWorkaround =true
}else{
 osHasWorkaround =false
}

lettestingOldSDK=CommandLine.arguments.last =="oldSDK"

vartests:TestSuite

if testingOldSDK {
 tests =TestSuite("old SDK protocol conformance collision")
 tests.test("CFString: Hashable conformance"){
 _ =firstHashValue(NSSet(object:"Whatever")as!Set<CFString>)

letexpectedCallCount= osHasWorkaround ?1:0
expectEqual(expectedCallCount,CFString.localHashableCallCount)
}
}else{
 tests =TestSuite("new SDK protocol conformance collision")
 tests.test("CFString: Hashable conformance"){
 _ =firstHashValue(NSSet(object:"Whatever")as!Set<CFString>)

expectEqual(0,CFString.localHashableCallCount)
}
}

runAllTests()