Add regression tests to close several issues p. 2

test/Interpreter/SDK/CoreFoundation_casting.swift

@@ -85,3 +85,38 @@ func testCFStringAnyObjectType() {
   print("done")
 }
 testCFStringAnyObjectType()
+
+// https://github.com/apple/swift/issues/43022
+func testOptionalCFStringToStringAndNSString() {
+  let optCFStr: CFString? = "Swift" as CFString
+
+  // CHECK: {{^}}Optional(Swift){{$}}
+  print(optCFStr)
+
+  let swiftStr1 = optCFStr as? String
+  let swiftStr2 = optCFStr as String?
+
+  let nsStr1 = optCFStr as? NSString
+  let nsStr2 = optCFStr as NSString?
+
+  if let unwrapped = swiftStr1 {
+    // CHECK-NEXT: {{^}}Swift{{$}}
+    print(unwrapped)
+  }
+  if let unwrapped = swiftStr2 {
+    // CHECK-NEXT: {{^}}Swift{{$}}
+    print(unwrapped)
+  }
+  if let unwrapped = nsStr1 {
+    // CHECK-NEXT: {{^}}Swift{{$}}
+    print(unwrapped)
+  }
+  if let unwrapped = nsStr2 {
+    // CHECK-NEXT: {{^}}Swift{{$}}
+    print(unwrapped)
+  }
+
+  // CHECK-NEXT: {{^}}done{{$}}
+  print("done")
+}
+testOptionalCFStringToStringAndNSString()

test/Parse/switch.swift

@@ -314,7 +314,7 @@ func enumElementSyntaxOnTuple() {
   }
 }
 
-// sr-176
+// https://github.com/apple/swift/issues/42798
 enum Whatever { case Thing }
 func f0(values: [Whatever]) { // expected-note {{'values' declared here}}
     switch value { // expected-error {{cannot find 'value' in scope; did you mean 'values'?}}
@@ -323,7 +323,8 @@ func f0(values: [Whatever]) { // expected-note {{'values' declared here}}
     }
 }
 
-// sr-720
+// https://github.com/apple/swift/issues/43334
+// https://github.com/apple/swift/issues/43335
 enum Whichever {
   case Thing
   static let title = "title"
@@ -348,6 +349,12 @@ func f1(x: String, y: Whichever) {
     case Whichever.title: // expected-error {{expression pattern of type 'String' cannot match values of type 'Whichever'}}
         break
   }
+  switch y {
+    case .alias:
+      break
+    default:
+      break
+  }
 }
 
 

test/stdlib/Inputs/Mirror/Mirror.h

@@ -27,4 +27,7 @@
 @interface FooMoreDerivedObjCClass : FooDerivedObjCClass
 @end
 
+@interface StringConvertibleInDebugAndOtherwise_ObjC : NSObject
+@end
+
 #endif

test/stdlib/Inputs/Mirror/Mirror.mm

@@ -31,3 +31,14 @@ @implementation FooDerivedObjCClass : FooObjCClass
 @implementation FooMoreDerivedObjCClass : FooDerivedObjCClass
 @end
 
+@implementation StringConvertibleInDebugAndOtherwise_ObjC : NSObject
+
+-(NSString *) description {
+  return @"description";
+}
+
+-(NSString *) debugDescription {
+  return @"debugDescription";
+}
+
+@end

test/stdlib/Mirror.swift

@@ -558,14 +558,12 @@ func verifyWeakUnownedReflection
     expectEqual(child.label, name)
     expectNotNil(child.value)
 
-    // FIXME: These casts are currently broken (Dec 2019)
-    // Once they are fixed, enable additional checks:
-    //let vp1 = child.value as? WeakUnownedTestsP1
-    //expectNotNil(vp1)
-    //expectEqual(vp1!.f1(), 2)
-    //let vp2 = child.value as? WeakUnownedTestsP2
-    //expectNotNil(vp2)
-    //expectEqual(vp2!.f2(), "b")
+    let vp1 = child.value as? WeakUnownedTestsP1
+    expectNotNil(vp1)
+    expectEqual(vp1!.f1(), 2)
+    let vp2 = child.value as? WeakUnownedTestsP2
+    expectNotNil(vp2)
+    expectEqual(vp2!.f2(), "b")
 
     let v = child.value as? ExpectedClass
     expectNotNil(v)
@@ -1554,6 +1552,7 @@ mirrors.test("CustomMirrorIsInherited") {
 //===----------------------------------------------------------------------===//
 
 protocol SomeNativeProto {}
+protocol SomeOtherNativeProto {}
 extension Int: SomeNativeProto {}
 
 class SomeClass {}
@@ -1588,6 +1587,14 @@ mirrors.test("MetatypeMirror") {
     output = ""
     dump(nativeProtocolConcreteMetatype, to: &output)
     expectEqual(expectedNativeProtocolConcrete, output)
+
+    let nativeProtocolCompositionMetatype =
+        (SomeNativeProto & SomeOtherNativeProto).self
+    output = ""
+    dump(nativeProtocolCompositionMetatype, to: &output)
+    expectEqual(
+      "- Mirror.SomeNativeProto & Mirror.SomeOtherNativeProto #0\n",
+      output)
   }
 }
 

test/stdlib/Reflection.swift

@@ -194,5 +194,40 @@ sanePointerString.deallocate()
 var rawPointer = unsafeBitCast(0 as Int, to: Builtin.RawPointer.self)
 dump(rawPointer)
 
+// https://github.com/apple/swift/issues/43211
+// CHECK-LABEL: {{^}}weak with dynamic value{{$}}
+print("weak with dynamic value")
+do {
+  class Child {}
+  class Example {
+    weak var value: Child?
+  }
+
+  var c: Child? = Child()
+  let e = Example()
+  e.value = c
+
+  // CHECK-NEXT: c1: Optional(Reflection.{{.*}}.Child)
+  // CHECK-NEXT:   some: Reflection.{{.*}}.Child #0
+  dump(c, name: "c1")
+  // CHECK-NEXT: e1: Reflection.{{.*}}.Example #0
+  // CHECK-NEXT:   value: Optional(Reflection.{{.*}}.Child)
+  // CHECK-NEXT:     some: Reflection.{{.*}}.Child #1
+  dump(e, name: "e1")
+  // CHECK-NEXT: value1: Optional(Reflection.{{.*}}.Child)
+  // CHECK-NEXT:   some: Reflection.{{.*}}.Child #0
+  dump(e.value, name: "value1")
+
+  c = nil
+
+  // CHECK-NEXT: c2: nil
+  dump(c, name: "c2")
+  // CHECK-NEXT: e2: Reflection.{{.*}}.Example #0
+  // CHECK-NEXT:   value: nil
+  dump(e, name: "e2")
+  // CHECK-NEXT: value2: nil
+  dump(e.value, name: "value2")
+}
+
 // CHECK-LABEL: and now our song is done
 print("and now our song is done")

test/stdlib/RuntimeObjC.swift

@@ -740,14 +740,17 @@ Reflection.test("Name of metatype of artificial subclass") {
   expectEqual(String(reflecting: type(of: obj)), "a.TestArtificialSubclass")
 }
 
-@objc class StringConvertibleInDebugAndOtherwise : NSObject {
+@objc class StringConvertibleInDebugAndOtherwise_Native : NSObject {
   override var description: String { return "description" }
   override var debugDescription: String { return "debugDescription" }
 }
 
 Reflection.test("NSObject is properly CustomDebugStringConvertible") {
-  let object = StringConvertibleInDebugAndOtherwise()
-  expectEqual(String(reflecting: object), object.debugDescription)
+  let objectNative = StringConvertibleInDebugAndOtherwise_Native()
+  let objectObjC = StringConvertibleInDebugAndOtherwise_ObjC()
+
+  expectEqual(String(reflecting: objectNative), objectNative.debugDescription)
+  expectEqual(String(reflecting: objectObjC), objectObjC.debugDescription)
 }
 
 Reflection.test("NSRange QuickLook") {

validation-test/compiler_crashers_fixed/26018-swift-parser-skipsingle.swift

@@ -6,6 +6,10 @@
 // See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
 
 // RUN: not %target-swift-frontend %s -typecheck
+
+// https://github.com/apple/swift/issues/43187
+// RUN: %target-swift-ide-test -structure -source-filename=%s
+
 for
 {({{{class
 case,