| // RUN: %empty-directory(%t) |
| // RUN: %target-build-swift %s -o %t/a.out4 -swift-version 4 && %target-run %t/a.out4 |
| // RUN: %target-build-swift %s -o %t/a.out5 -swift-version 5 && %target-run %t/a.out5 |
| // REQUIRES: executable_test |
| |
| import StdlibUnittest |
| |
| #if swift(>=4.2) |
| let swiftVersion = ">=4.2" |
| #else |
| let swiftVersion = "<4.2" |
| #endif |
| |
| let tests = TestSuite("ReverseCompatibility") |
| |
| tests.test("Double reverse type/Collection/\(swiftVersion)") { |
| func reverse<C : BidirectionalCollection>(_ xs: C) { |
| var result = xs.reversed().reversed() |
| #if swift(>=4.2) |
| expectType(C.self, &result) |
| #else |
| expectType(ReversedCollection<ReversedCollection<C>>.self, &result) |
| #endif |
| } |
| reverse(Array(0..<10)) |
| |
| func backwardCompatible<C : BidirectionalCollection>(_ xs: C) { |
| typealias ExpectedType = ReversedCollection<ReversedCollection<C>> |
| var result: ExpectedType = xs.reversed().reversed() |
| expectType(ExpectedType.self, &result) |
| } |
| backwardCompatible(Array(0..<10)) |
| } |
| |
| runAllTests() |
