| // RUN: %empty-directory(%t) |
| // RUN: %target-build-swift %s -o %t/a.out4 -swift-version 4 && %target-codesign %t/a.out4 && %target-run %t/a.out4 |
| |
| // REQUIRES: executable_test |
| |
| import StdlibUnittest |
| |
| var tests = TestSuite("RangeReplaceableFilterCompatibility") |
| |
| tests.test("String.filter return type") { |
| var filtered = "Hello, World".filter { $0 < "A" } |
| expectType(String.self, &filtered) |
| } |
| |
| tests.test("Array.filter return type") { |
| var filtered = Array(0..<10).filter { $0 % 2 == 0 } |
| expectType([Int].self, &filtered) |
| } |
| |
| tests.test("ContiguousArray.filter return type") { |
| var filtered = ContiguousArray(0..<10).filter { $0 % 2 == 0 } |
| expectType([Int].self, &filtered) |
| } |
| |
| tests.test("ArraySlice.filter return type") { |
| var filtered = Array(0..<10)[0..<10].filter { $0 % 2 == 0 } |
| expectType([Int].self, &filtered) |
| } |
| |
| tests.test("String.filter can return [Character]") { |
| let filtered = "Hello, World".filter { "A" <= $0 && $0 <= "Z"} as [Character] |
| expectEqualSequence("HW", filtered) |
| } |
| |
| tests.test("lazy.flatMap.filter ambiguity") { |
| // this expression should compile without ambiguity |
| _ = Array(0..<10).lazy.flatMap { .some($0) }.filter { _ in false } |
| } |
| |
| runAllTests() |
| |