accessibility_private.swift

// RUN: %target-typecheck-verify-swift -swift-version 4

class Container {
  private func foo() {} // expected-note * {{declared here}}
  private var bar = 0 // expected-note * {{declared here}}

  private struct PrivateInner {} // expected-note * {{declared here}}

  func localTest() {
    foo()
    self.foo()

    _ = bar
    bar = 5
    _ = self.bar
    self.bar = 5

    privateExtensionMethod()
    self.privateExtensionMethod()

    _ = PrivateInner()
    _ = Container.PrivateInner()
  }

  struct Inner {
    func test(obj: Container) {
      obj.foo()
      _ = obj.bar
      obj.bar = 5
      obj.privateExtensionMethod()

      _ = PrivateInner()
      _ = Container.PrivateInner()
    }

    var inner: PrivateInner? // expected-error {{property must be declared private because its type uses a private type}}
    var innerQualified: Container.PrivateInner? // expected-error {{property must be declared private because its type uses a private type}} expected-note {{declared here}}
  }

  var inner: PrivateInner? // expected-error {{property must be declared private because its type uses a private type}}
  var innerQualified: Container.PrivateInner? // expected-error {{property must be declared private because its type uses a private type}}
}

func test(obj: Container) {
  obj.foo() // expected-error {{'foo' is inaccessible due to 'private' protection level}}
  _ = obj.bar // expected-error {{'bar' is inaccessible due to 'private' protection level}}
  obj.bar = 5 // expected-error {{'bar' is inaccessible due to 'private' protection level}}
  obj.privateExtensionMethod() // expected-error {{'privateExtensionMethod' is inaccessible due to 'private' protection level}}

  _ = Container.PrivateInner() // expected-error {{'PrivateInner' is inaccessible due to 'private' protection level}}
}

extension Container {
  private func privateExtensionMethod() {} // expected-note * {{declared here}}

  func extensionTest() {
    foo()
    self.foo()

    _ = bar
    bar = 5
    _ = self.bar
    self.bar = 5

    privateExtensionMethod()
    self.privateExtensionMethod()

    _ = PrivateInner()
    _ = Container.PrivateInner()
  }

  var extensionInner: PrivateInner? { return nil } // expected-error {{property must be declared private because its type uses a private type}}
  var extensionInnerQualified: Container.PrivateInner? { return nil } // expected-error {{property must be declared private because its type uses a private type}}
}

extension Container.Inner {
  func extensionTest(obj: Container) {
    obj.foo()
    _ = obj.bar
    obj.bar = 5
    obj.privateExtensionMethod()

    // FIXME: Unqualified lookup won't look into Container from here.
    _ = PrivateInner() // expected-error {{cannot find 'PrivateInner' in scope}}
    _ = Container.PrivateInner()
  }

  // FIXME: Unqualified lookup won't look into Container from here.
  var inner: PrivateInner? { return nil } // expected-error {{cannot find type 'PrivateInner' in scope}}
  var innerQualified: Container.PrivateInner? { return nil } // expected-error {{invalid redeclaration of 'innerQualified'}} expected-error {{property must be declared private because its type uses a private type}}
}

class Sub : Container {
  func subTest() {
    foo() // expected-error {{'foo' is inaccessible due to 'private' protection level}}
    self.foo() // expected-error {{'foo' is inaccessible due to 'private' protection level}}

    _ = bar // expected-error {{'bar' is inaccessible due to 'private' protection level}}
    bar = 5 // expected-error {{'bar' is inaccessible due to 'private' protection level}}
    _ = self.bar // expected-error {{'bar' is inaccessible due to 'private' protection level}}
    self.bar = 5 // expected-error {{'bar' is inaccessible due to 'private' protection level}}

    privateExtensionMethod() // expected-error {{'privateExtensionMethod' is inaccessible due to 'private' protection level}}
    self.privateExtensionMethod() // expected-error {{'privateExtensionMethod' is inaccessible due to 'private' protection level}}

    _ = PrivateInner() // expected-error {{'PrivateInner' is inaccessible due to 'private' protection level}}
    _ = Container.PrivateInner() // expected-error {{'PrivateInner' is inaccessible due to 'private' protection level}}
  }

  var subInner: PrivateInner? // expected-error {{'PrivateInner' is inaccessible due to 'private' protection level}}
  var subInnerQualified: Container.PrivateInner? // expected-error {{'PrivateInner' is inaccessible due to 'private' protection level}}
}


protocol VeryImportantProto {
  associatedtype Assoc
  var value: Int { get set } // expected-note {{protocol requires property 'value' with type 'Int'}}
}

private struct VIPPrivateType : VeryImportantProto {
  private typealias Assoc = Int // expected-error {{type alias 'Assoc' must be as accessible as its enclosing type because it matches a requirement in protocol 'VeryImportantProto'}} {{none}}
  // expected-note@-1 {{mark the type alias as 'fileprivate' to satisfy the requirement}} {{3-10=fileprivate}}
  var value: Int
}

private struct VIPPrivateProp : VeryImportantProto {
  typealias Assoc = Int
  private var value: Int // expected-error {{property 'value' must be as accessible as its enclosing type because it matches a requirement in protocol 'VeryImportantProto'}} {{none}}
  // expected-note@-1 {{mark the property as 'fileprivate' to satisfy the requirement}} {{3-10=fileprivate}}
}

private struct VIPPrivateSetProp : VeryImportantProto {
  typealias Assoc = Int
  private(set) var value: Int // expected-error {{setter for property 'value' must be as accessible as its enclosing type because it matches a requirement in protocol 'VeryImportantProto'}}
  // expected-note@-1 {{mark the property as 'fileprivate' to satisfy the requirement}} {{3-10=fileprivate}}
}

private class VIPPrivateSetBase {
  private var value: Int = 0
}
private class VIPPrivateSetSub : VIPPrivateSetBase, VeryImportantProto { 
  // expected-error@-1 {{type 'VIPPrivateSetSub' does not conform to protocol 'VeryImportantProto'}}
  // expected-note@-2 {{add stubs for conformance}}
  typealias Assoc = Int
}

private class VIPPrivateSetPropBase {
  private(set) var value: Int = 0
  // expected-note@-1 {{mark the property as 'fileprivate' to satisfy the requirement}} {{3-10=fileprivate}}
}
private class VIPPrivateSetPropSub : VIPPrivateSetPropBase, VeryImportantProto {
  // expected-error@-1 {{setter for property 'value' must be as accessible as its enclosing type because it matches a requirement in protocol 'VeryImportantProto'}} {{none}}
  typealias Assoc = Int
}

extension Container {
  private typealias ExtensionConflictingType = Int // expected-note {{found candidate with type}} expected-note {{previously declared here}} expected-note{{found this candidate}}
}
extension Container {
  private typealias ExtensionConflictingType = Double  // expected-error {{invalid redeclaration of 'ExtensionConflictingType'}} expected-note {{found candidate with type}} expected-note{{found this candidate}}
}
extension Container {
  func test() {
    let a: ExtensionConflictingType? = nil // expected-error{{'ExtensionConflictingType' is ambiguous for type lookup in this context}}
    let b: Container.ExtensionConflictingType? = nil // expected-error {{ambiguous type name 'ExtensionConflictingType' in 'Container'}}
    _ = ExtensionConflictingType()
    _ = Container.ExtensionConflictingType()
  }
}

// All of these are errors in Swift 4, but didn't have the correct behavior in 
// Swift 3.0GM.
extension Container {
  private struct VeryPrivateStruct { // expected-note * {{type declared here}}
    private typealias VeryPrivateType = Int // expected-note * {{type declared here}}
    private struct VeryPrivateInnerStruct {}
    var privateVar: VeryPrivateType { fatalError() } // expected-error {{property must be declared private because its type uses a private type}}
    var privateVar2 = VeryPrivateType() // expected-error {{property must be declared private because its type 'Container.VeryPrivateStruct.VeryPrivateType' (aka 'Int') uses a private type}}
    var privateVar3 = VeryPrivateInnerStruct() // expected-error {{property must be declared private because its type 'Container.VeryPrivateStruct.VeryPrivateInnerStruct' uses a private type}}
    typealias PrivateAlias = VeryPrivateType // expected-error {{type alias must be declared private because its underlying type uses a private type}}
    subscript(_: VeryPrivateType) -> Void { return () } // expected-error {{subscript must be declared private because its index uses a private type}}
    func privateMethod(_: VeryPrivateType) -> Void {} // expected-error {{method must be declared private because its parameter uses a private type}} {{none}}
    enum PrivateRawValue: VeryPrivateType { // expected-error {{enum must be declared private because its raw type uses a private type}} {{none}}
      case A
    }
    enum PrivatePayload {
      case A(VeryPrivateType) // expected-error {{enum case in an internal enum uses a private type}} {{none}}
    }

    private class PrivateInnerClass {} // expected-note * {{declared here}}
    class PrivateSuper: PrivateInnerClass {} // expected-error {{class must be declared private because its superclass is private}} {{none}}
  }

  fileprivate var privateVar: VeryPrivateStruct { fatalError() } // expected-error {{property cannot be declared fileprivate because its type uses a private type}} {{none}}
  fileprivate typealias PrivateAlias = VeryPrivateStruct // expected-error {{type alias cannot be declared fileprivate because its underlying type uses a private type}} {{none}}
  fileprivate subscript(_: VeryPrivateStruct) -> Void { return () } // expected-error {{subscript cannot be declared fileprivate because its index uses a private type}} {{none}}
  fileprivate func privateMethod(_: VeryPrivateStruct) -> Void {} // expected-error {{method cannot be declared fileprivate because its parameter uses a private type}} {{none}}
  fileprivate enum PrivateRawValue: VeryPrivateStruct {} 
  // expected-error@-1 {{enum cannot be declared fileprivate because its raw type uses a private type}} {{none}} 
  // expected-error@-2 {{raw type 'Container.VeryPrivateStruct' is not expressible by a string, integer, or floating-point literal}}
  // expected-error@-3 {{'Container.PrivateRawValue' declares raw type 'Container.VeryPrivateStruct', but does not conform to RawRepresentable and conformance could not be synthesized}}
  // expected-error@-4 {{RawRepresentable conformance cannot be synthesized because raw type 'Container.VeryPrivateStruct' is not Equatable}}
  // expected-note@-5 {{add stubs for conformance}}
  // expected-error@-6 {{an enum with no cases cannot declare a raw type}}
  fileprivate enum PrivatePayload {
    case A(VeryPrivateStruct) // expected-error {{enum case in an internal enum uses a private type}} {{none}}
  }

  private class PrivateInnerClass {} // expected-note * {{declared here}}
  fileprivate class PrivateSuperClass: PrivateInnerClass {} // expected-error {{class cannot be declared fileprivate because its superclass is private}} {{none}}
  fileprivate class PrivateGenericUser<T> where T: PrivateInnerClass {} // expected-error {{generic class cannot be declared fileprivate because its generic requirement uses a private type}} {{none}}
}

// https://github.com/apple/swift/issues/45184
fileprivate struct C_45184 {
  private struct Inner {
    private struct InnerPrivateType {}
    var innerProperty = InnerPrivateType() // expected-error {{property must be declared private because its type 'C_45184.Inner.InnerPrivateType' uses a private type}}
  }
  // FIXME: We need better errors when one access violation results in more
  // downstream.
  private var outerProperty = Inner().innerProperty // expected-error {{property cannot be declared in this context because its type 'C_45184.Inner.InnerPrivateType' uses a private type}}
  var outerProperty2 = Inner().innerProperty // expected-error {{property must be declared private because its type 'C_45184.Inner.InnerPrivateType' uses a private type}}
}