Merge pull request #9748 from moiseev/rrc-filter-tests

[stdlib] More tests for RangeReplaceable.filter and Arrays

Author: moiseev

test/stdlib/ArrayFilter.swift

@@ -0,0 +1,12 @@
+// RUN: %target-swift-frontend -swift-version 4 -O %s -emit-sil | %FileCheck %s
+
+// This test is testing that even in presence of
+// RangeReplaceableCollection.filter(_:), Arrays are still calling the default
+// implementation from Sequence.
+
+// CHECK-NOT: RangeReplaceableCollection.filter(_:)
+@inline(never)
+public func foobar(_ xs: [Int]) -> [Int] {
+  return xs.filter { _ in false }
+}
+

test/stdlib/RangeReplaceableFilterCompatibility.swift

@@ -20,10 +20,20 @@ tests.test("Array.filter return type") {
   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)
 }
 
-
 runAllTests()
+