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// RUN: %target-typecheck-verify-swift -swift-version 5
@override // expected-error {{'override' can only be specified on class members}} {{1-11=}} expected-error {{'override' is a declaration modifier, not an attribute}} {{1-2=}}
func virtualAttributeCanNotBeUsedInSource() {}
class MixedKeywordsAndAttributes { // expected-note {{in declaration of 'MixedKeywordsAndAttributes'}}
// expected-error@+1 {{expected declaration}} expected-error@+1 {{consecutive declarations on a line must be separated by ';'}} {{11-11=;}}
override @inline(never) func f1() {}
}
class DuplicateOverrideBase {
func f1() {}
class func cf1() {}
class func cf2() {}
class func cf3() {}
class func cf4() {}
}
class DuplicateOverrideDerived : DuplicateOverrideBase {
override override func f1() {} // expected-error {{duplicate modifier}} expected-note {{modifier already specified here}}
override override class func cf1() {} // expected-error {{duplicate modifier}} expected-note {{modifier already specified here}}
override class override func cf2() {} // expected-error {{duplicate modifier}} expected-note {{modifier already specified here}}
class override override func cf3() {} // expected-error {{duplicate modifier}} expected-note {{modifier already specified here}}
override class override func cf4() {} // expected-error {{duplicate modifier}} expected-note {{modifier already specified here}}
}
class A {
func f0() { }
func f1() { } // expected-note{{overridden declaration is here}}
var v1: Int { return 5 }
var v2: Int { return 5 } // expected-note{{overridden declaration is here}}
internal var v21: Int { return 5 } // expected-note{{overridden declaration is here}}
var v4: String { return "hello" }// expected-note{{attempt to override property here}}
var v5: A { return self }
var v6: A { return self }
var v7: A { // expected-note{{attempt to override property here}}
get { return self }
set { }
}
var v8: Int = 0 // expected-note {{attempt to override property here}}
var v9: Int { return 5 } // expected-note{{attempt to override property here}}
var v10: Int { return 5 } // expected-note{{attempt to override property here}}
subscript (i: Int) -> String { // expected-note{{potential overridden subscript 'subscript(_:)' here}}
get {
return "hello"
}
set {
}
}
subscript (d: Double) -> String { // expected-note{{overridden declaration is here}} expected-note{{potential overridden subscript 'subscript(_:)' here}}
get {
return "hello"
}
set {
}
}
class subscript (i: String) -> String { // expected-note{{overridden declaration is here}} expected-note{{potential overridden class subscript 'subscript(_:)' here}}
get {
return "hello"
}
set {
}
}
class subscript (typeInSuperclass a: [Int]) -> String {
get {
return "hello"
}
set {
}
}
subscript (i: Int8) -> A { // expected-note{{potential overridden subscript 'subscript(_:)' here}}
get { return self }
}
subscript (i: Int16) -> A { // expected-note{{attempt to override subscript here}} expected-note{{potential overridden subscript 'subscript(_:)' here}}
get { return self }
set { }
}
func overriddenInExtension() {} // expected-note {{overr}}
}
class B : A {
override func f0() { }
func f1() { } // expected-error{{overriding declaration requires an 'override' keyword}}{{3-3=override }}
override func f2() { } // expected-error{{method does not override any method from its superclass}}
override var v1: Int { return 5 }
var v2: Int { return 5 } // expected-error{{overriding declaration requires an 'override' keyword}}{{3-3=override }}
internal var v21: Int { return 5 } // expected-error{{overriding declaration requires an 'override' keyword}}{{12-12=override }}
override var v3: Int { return 5 } // expected-error{{property does not override any property from its superclass}}
override var v4: Int { return 5 } // expected-error{{property 'v4' with type 'Int' cannot override a property with type 'String'}}
// Covariance
override var v5: B { return self }
override var v6: B {
get { return self }
set { }
}
override var v7: B { // expected-error{{cannot override mutable property 'v7' of type 'A' with covariant type 'B'}}
get { return self }
set { }
}
// Stored properties
override var v8: Int { return 5 } // expected-error {{cannot override mutable property with read-only property 'v8'}}
override var v9: Int // expected-error{{cannot override with a stored property 'v9'}}
lazy override var v10: Int = 5 // expected-error{{cannot override with a stored property 'v10'}}
override subscript (i: Int) -> String {
get {
return "hello"
}
set {
}
}
subscript (d: Double) -> String { // expected-error{{overriding declaration requires an 'override' keyword}} {{3-3=override }}
get {
return "hello"
}
set {
}
}
override subscript (f: Float) -> String { // expected-error{{subscript does not override any subscript from its superclass}}
get {
return "hello"
}
set {
}
}
override class subscript (i: Int) -> String { // expected-error{{subscript does not override any subscript from its superclass}}
get {
return "hello"
}
set {
}
}
static subscript (i: String) -> String { // expected-error{{overriding declaration requires an 'override' keyword}} {{3-3=override }}
get {
return "hello"
}
set {
}
}
static subscript (i: Double) -> String {
get {
return "hello"
}
set {
}
}
override class subscript (typeInSuperclass a: [Int]) -> String {
get {
return "hello"
}
set {
}
}
override subscript (typeInSuperclass a: [Int]) -> String { // expected-error{{subscript does not override any subscript from its superclass}}
get {
return "hello"
}
set {
}
}
// Covariant
override subscript (i: Int8) -> B {
get { return self }
}
override subscript (i: Int16) -> B { // expected-error{{cannot override mutable subscript of type '(Int16) -> B' with covariant type '(Int16) -> A'}}
get { return self }
set { }
}
override init() { }
override deinit { } // expected-error{{'override' modifier cannot be applied to this declaration}} {{3-12=}}
override typealias Inner = Int // expected-error{{'override' modifier cannot be applied to this declaration}} {{3-12=}}
}
extension B {
override func overriddenInExtension() {} // expected-error{{overr}}
}
struct S {
override func f() { } // expected-error{{'override' can only be specified on class members}} {{3-12=}}
}
extension S {
override func ef() {} // expected-error{{'override' can only be specified on class members}} {{3-12=}}
}
enum E {
override func f() { } // expected-error{{'override' can only be specified on class members}} {{3-12=}}
}
protocol P {
override func f() // expected-error{{method does not override any method from its parent protocol}}
override var g: Int { get } // expected-error{{property does not override any property from its parent protocol}}
override subscript(h: Int) -> Bool { get } // expected-error{{subscript does not override any subscript from its parent protocol}}
override init(i: Int) // expected-error{{initializer does not override a designated initializer from its parent protocol}}
}
override func f() { } // expected-error{{'override' can only be specified on class members}} {{1-10=}}
// Invalid 'override' on declarations inside closures.
var rdar16654075a = {
override func foo() {} // expected-error{{'override' can only be specified on class members}} {{3-12=}}
}
var rdar16654075b = {
class A {
override func foo() {} // expected-error{{method does not override any method from its superclass}}
}
}
var rdar16654075c = { () -> () in
override func foo() {} // expected-error {{'override' can only be specified on class members}} {{3-12=}}
()
}
var rdar16654075d = { () -> () in
class A {
override func foo() {} // expected-error {{method does not override any method from its superclass}}
}
A().foo()
}
var rdar16654075e = { () -> () in
class A {
func foo() {}
}
class B : A {
override func foo() {}
}
A().foo()
}
class C {
init(string: String) { } // expected-note{{overridden declaration is here}}
required init(double: Double) { } // expected-note 3{{overridden required initializer is here}}
convenience init() { self.init(string: "hello") } // expected-note{{attempt to override convenience initializer here}}
}
class D1 : C {
override init(string: String) { super.init(string: string) }
required init(double: Double) { }
convenience init() { self.init(string: "hello") }
}
class D2 : C {
init(string: String) { super.init(string: string) } // expected-error{{overriding declaration requires an 'override' keyword}}{{3-3=override }}
// FIXME: Would like to remove the space after 'override' as well.
required override init(double: Double) { } // expected-warning{{'override' is implied when overriding a required initializer}} {{12-21=}}
override convenience init() { self.init(string: "hello") } // expected-error{{initializer does not override a designated initializer from its superclass}}
}
class D3 : C {
override init(string: String) { super.init(string: string) }
override init(double: Double) { } // expected-error{{use the 'required' modifier to override a required initializer}}{{3-11=required}}
}
class D4 : C {
// "required override" only when we're overriding a non-required
// designated initializer with a required initializer.
required override init(string: String) { super.init(string: string) }
required init(double: Double) { }
}
class D5 : C {
// "required override" only when we're overriding a non-required
// designated initializer with a required initializer.
required convenience override init(string: String) { self.init(double: 5.0) }
required init(double: Double) { }
}
class D6 : C {
init(double: Double) { } // expected-error{{'required' modifier must be present on all overrides of a required initializer}} {{3-3=required }}
}
// rdar://problem/18232867
class C_empty_tuple {
init() { }
}
class D_empty_tuple : C_empty_tuple {
override init(foo:()) { } // expected-error{{initializer does not override a designated initializer from its superclass}}
}
class C_with_let {
let x = 42 // expected-note {{attempt to override property here}}
}
class D_with_let : C_with_let {
override var x : Int { get { return 4 } set {} } // expected-error {{cannot override immutable 'let' property 'x' with the getter of a 'var'}}
}
// <rdar://problem/21311590> QoI: Inconsistent diagnostics when no constructor is available
class C21311590 {
override init() {} // expected-error {{initializer does not override a designated initializer from its superclass}}
}
class B21311590 : C21311590 {}
_ = C21311590()
_ = B21311590()
class MismatchOptionalBase {
func param(_: Int?) {}
func paramIUO(_: Int!) {}
func result() -> Int { return 0 }
func fixSeveralTypes(a: Int?, b: Int!) -> Int { return 0 }
func functionParam(x: ((Int) -> Int)?) {}
func tupleParam(x: (Int, Int)?) {}
func compositionParam(x: (P1 & P2)?) {}
func nameAndTypeMismatch(label: Int?) {}
func ambiguousOverride(a: Int, b: Int?) {} // expected-note 2 {{overridden declaration is here}} expected-note {{potential overridden instance method 'ambiguousOverride(a:b:)' here}}
func ambiguousOverride(a: Int?, b: Int) {} // expected-note 2 {{overridden declaration is here}} expected-note {{potential overridden instance method 'ambiguousOverride(a:b:)' here}}
var prop: Int = 0 // expected-note {{attempt to override property here}}
var optProp: Int? // expected-note {{attempt to override property here}}
var getProp: Int { return 0 } // expected-note {{attempt to override property here}}
var getOptProp: Int? { return nil }
init(param: Int?) {}
init() {} // expected-note {{non-failable initializer 'init()' overridden here}}
subscript(a: Int?) -> Void { // expected-note {{attempt to override subscript here}}
get { return () }
set {}
}
subscript(b: Void) -> Int { // expected-note {{attempt to override subscript here}}
get { return 0 }
set {}
}
subscript(get a: Int?) -> Void {
return ()
}
subscript(get b: Void) -> Int {
return 0
}
subscript(ambiguous a: Int, b: Int?) -> Void { // expected-note {{overridden declaration is here}} expected-note {{potential overridden subscript 'subscript(ambiguous:_:)' here}}
return ()
}
subscript(ambiguous a: Int?, b: Int) -> Void { // expected-note {{overridden declaration is here}} expected-note {{potential overridden subscript 'subscript(ambiguous:_:)' here}}
return ()
}
}
protocol P1 {}
protocol P2 {}
class MismatchOptional : MismatchOptionalBase {
override func param(_: Int) {} // expected-error {{cannot override instance method parameter of type 'Int?' with non-optional type 'Int'}} {{29-29=?}}
override func paramIUO(_: Int) {} // expected-error {{cannot override instance method parameter of type 'Int?' with non-optional type 'Int'}} {{32-32=?}}
override func result() -> Int? { return nil } // expected-error {{cannot override instance method result type 'Int' with optional type 'Int?'}} {{32-33=}}
override func fixSeveralTypes(a: Int, b: Int) -> Int! { return nil }
// expected-error@-1 {{cannot override instance method parameter of type 'Int?' with non-optional type 'Int'}} {{39-39=?}}
// expected-error@-2 {{cannot override instance method parameter of type 'Int?' with non-optional type 'Int'}} {{47-47=?}}
// expected-error@-3 {{cannot override instance method result type 'Int' with optional type 'Int?'}} {{55-56=}}
override func functionParam(x: @escaping (Int) -> Int) {} // expected-error {{cannot override instance method parameter of type '((Int) -> Int)?' with non-optional type '(Int) -> Int'}} {{34-34=(}} {{56-56=)?}}
override func tupleParam(x: (Int, Int)) {} // expected-error {{cannot override instance method parameter of type '(Int, Int)?' with non-optional type '(Int, Int)'}} {{41-41=?}}
override func compositionParam(x: P1 & P2) {} // expected-error {{cannot override instance method parameter of type '(any P1 & P2)?' with non-optional type 'any P1 & P2'}} {{37-37=(}} {{44-44=)?}}
override func nameAndTypeMismatch(_: Int) {}
// expected-error@-1 {{argument labels for method 'nameAndTypeMismatch' do not match those of overridden method 'nameAndTypeMismatch(label:)'}} {{37-37=label }}
// expected-error@-2 {{cannot override instance method parameter of type 'Int?' with non-optional type 'Int'}} {{43-43=?}}
override func ambiguousOverride(a: Int?, b: Int?) {} // expected-error {{declaration 'ambiguousOverride(a:b:)' cannot override more than one superclass declaration}} {{none}}
override func ambiguousOverride(a: Int, b: Int) {} // expected-error {{method does not override any method from its superclass}} {{none}}
override var prop: Int? { // expected-error {{property 'prop' with type 'Int?' cannot override a property with type 'Int'}} {{none}}
get { return nil }
set {}
}
override var optProp: Int { // expected-error {{cannot override mutable property 'optProp' of type 'Int?' with covariant type 'Int'}} {{none}}
get { return 0 }
set {}
}
override var getProp: Int? { return nil } // expected-error {{property 'getProp' with type 'Int?' cannot override a property with type 'Int'}} {{none}}
override var getOptProp: Int { return 0 } // okay
override init(param: Int) {} // expected-error {{cannot override initializer parameter of type 'Int?' with non-optional type 'Int'}}
override init?() {} // expected-error {{failable initializer 'init()' cannot override a non-failable initializer}} {{none}}
override subscript(a: Int) -> Void { // expected-error {{cannot override mutable subscript of type '(Int) -> Void' with covariant type '(Int?) -> Void'}}
get { return () }
set {}
}
override subscript(b: Void) -> Int? { // expected-error {{cannot override mutable subscript of type '(Void) -> Int?' with covariant type '(Void) -> Int'}}
get { return nil }
set {}
}
override subscript(get a: Int) -> Void { // expected-error {{cannot override subscript index of type 'Int?' with non-optional type 'Int'}} {{32-32=?}}
return ()
}
override subscript(get b: Void) -> Int? { // expected-error {{cannot override subscript element type 'Int' with optional type 'Int?'}} {{41-42=}}
return nil
}
override subscript(ambiguous a: Int?, b: Int?) -> Void { // expected-error {{declaration 'subscript(ambiguous:_:)' cannot override more than one superclass declaration}}
return ()
}
override subscript(ambiguous a: Int, b: Int) -> Void { // expected-error {{subscript does not override any subscript from its superclass}}
return ()
}
}
class MismatchOptional2 : MismatchOptionalBase {
override func result() -> Int! { return nil } // expected-error {{cannot override instance method result type 'Int' with optional type 'Int?'}} {{32-33=}}
// None of these are overrides because we didn't say 'override'. Since they're
// not exact matches, they shouldn't result in errors.
func param(_: Int) {}
func ambiguousOverride(a: Int, b: Int) {}
// This is covariant, so we still assume it's meant to override.
func ambiguousOverride(a: Int?, b: Int?) {} // expected-error {{declaration 'ambiguousOverride(a:b:)' cannot override more than one superclass declaration}}
}
class MismatchOptional3 : MismatchOptionalBase {
override func result() -> Optional<Int> { return nil } // expected-error {{cannot override instance method result type 'Int' with optional type 'Optional<Int>'}} {{none}}
}
// Make sure we remap the method's innermost generic parameters
// to the correct depth
class GenericBase<T> {
func doStuff<U>(t: T, u: U) {}
init<U>(t: T, u: U) {}
}
class ConcreteSub : GenericBase<Int> {
override func doStuff<U>(t: Int, u: U) {}
override init<U>(t: Int, u: U) {}
}
class ConcreteBase {
init<U>(t: Int, u: U) {}
func doStuff<U>(t: Int, u: U) {}
}
class GenericSub<T> : ConcreteBase {
override init<U>(t: Int, u: U) {}
override func doStuff<U>(t: Int, u: U) {}
}
// Issue with generic parameter index
class MoreGenericSub1<T, TT> : GenericBase<T> {
override func doStuff<U>(t: T, u: U) {}
}
class MoreGenericSub2<TT, T> : GenericBase<T> {
override func doStuff<U>(t: T, u: U) {}
}
// Issue with insufficient canonicalization when
// comparing types
protocol SI {}
protocol CI {}
protocol Sequence {
associatedtype I : SI // expected-note{{declared here}}
}
protocol Collection : Sequence {
associatedtype I : CI // expected-warning{{redeclaration of associated type 'I'}}
}
class Index<F, T> {
func map(_ f: F) -> T {}
}
class CollectionIndex<C : Collection> : Index<C, C.I> {
override func map(_ f: C) -> C.I {}
}
// https://github.com/apple/swift/issues/46789
// Overrides with different generic signatures
protocol Protocol1 {}
protocol Protocol2 {}
// Base class is generic, derived class is concrete.
class Base1<T> {
func foo<U: Protocol1>(arg: U) {}
}
class Derived1: Base1<Protocol2> {
override func foo<T>(arg: T) {} // Ok?
}
// Base class is concrete, derived class is generic.
class Base2 {
func foo() {}
}
class Derived2<T>: Base2 {
override func foo<U>(arg: U) {} // expected-error {{method does not override any method from its superclass}}
}
// Base class generic w/ method generic, derived class generic w/ method not
// generic.
class Base3<T> {
func foo<U>(arg: U) {}
}
class Derived3<T>: Base3<T> {
override func foo() {} // expected-error {{method does not override any method from its superclass}}
}
// Base class generic w/ method generic, derived class generic w/ method generic
// but different requirement.
class Base4<T> {
func foo<U>(arg: U) {}
}
class Derived4<T>: Base4<T> {
override func foo<U: Protocol1>(arg: U) {} // expected-error {{method does not override any method from its superclass}}
}
// Base class not generic w/ method generic, derived class not generic w/ method
// generic but different requirement.
class Base5 {
func foo<T>(arg: T) {}
}
class Derived5: Base5 {
override func foo<T: Protocol1>(arg: T) {} // expected-error {{method does not override any method from its superclass}}
}
// Base class not generic w/ method generic, derived class not generic w/ method
// generic but removed requirement.
class Base6 {
func foo<T: Protocol2>(arg: T) {}
}
class Derived6: Base6 {
override func foo<T>(arg: T) {} // Ok?
}
// Base class not generic w/ method generic, derived class generic w/ method
// generic but different requirement.
class Base7 {
func foo<T: Protocol2>(arg: T) {}
}
class Derived7<T>: Base7 {
override func foo<U: Protocol1>(arg: U) {} // expected-error {{method does not override any method from its superclass}}
}
// Override with orthogonal requirement on contextual generic parameter.
class Base8<T> {
func foo1() where T: Protocol1 {}
func foo2() where T: Protocol1 {}
}
class Derived8<T>: Base8<T> {
override func foo1() where T: Protocol2 {} // expected-error {{method does not override any method from its superclass}}
override func foo2() {} // OK
}
// Subclass with new conformance requirement on inherited generic parameter.
class Base9<T> {
func foo() where T: Protocol1 {}
}
class Derived9<T: Protocol2, U>: Base9<T> {
// Because the generic signature of foo() is the same either way,
// it may seem confusing that placing an additional constraint on the
// generic parameter declaration directly has a different effect on
// overridability in contrast to placing the constraint on foo().
// The former (unlike the latter) is accepted because the constraint
// in question only affects the ability to initialize an instance of the
// subclass — not the visibility of the override itself relative to an
// existing instance.
override func foo() where T: Protocol1 {} // OK
}
// Override with less strict requirement via contextual where clauses.
class Base10<T> {
func foo() where T == Int {}
}
class Derived10<T>: Base10<T> {
override func foo() where T: FixedWidthInteger {} // OK
}
// Override with equivalent constraint on a different, non-inherited generic
// parameter.
class Base11<T> {
func foo() where T: Protocol1 {}
}
class Derived11<T, U>: Base11<T> {
override func foo() where U: Protocol1 {} // expected-error {{method does not override any method from its superclass}}
}
// Generic superclass / non-generic subclass.
class Base12<T> {
// The fact that the return type matches the substitution
// for T must hold across overrides.
func foo() -> T where T: FixedWidthInteger { fatalError() } // expected-note {{potential overridden instance method 'foo()' here}}
}
class Derived12_1: Base12<Int> {
override func foo() -> Int { return .zero } // OK
}
class Derived12_2: Base12<Bool> {
override func foo() -> Int { return .zero } // expected-error {{method does not override any method from its superclass}}
}
// Misc //
protocol P_Key {}
protocol P_Container {
associatedtype Key: P_Key
}
class Base13<Key: P_Key> {
func foo(forKey key: Key) throws {}
}
class Derived13<C: P_Container> : Base13<C.Key> {
typealias Key = C.Key
override func foo(forKey key: Key) throws {} // Okay, no generic signature mismatch
}
// https://github.com/apple/swift/issues/52598
class Base1_52598 {
func a<T>(_ val: T) -> String { return "not equatable" }
func a<T: Equatable>(_ val: T) -> String { return "equatable" }
}
class Derived1_52598: Base1_52598 {
override func a<T>(_ val: T) -> String { return super.a(val) } // okay
override func a<T: Equatable>(_ val: T) -> String { return super.a(val) } // okay
}
protocol P_52598 {
associatedtype Bar
}
struct S_52598: P_52598 {
typealias Bar = Int
}
class Base2_52598 {
init<F: P_52598>(_ arg: F) where F.Bar == Int {}
}
class Derived2_52598: Base2_52598 {
init(_ arg1: Int) { super.init(S_52598()) } // okay, doesn't crash
}
// https://github.com/apple/swift/issues/54147
public protocol P_54147 {}
public protocol Q_54147: P_54147 {
associatedtype A
}
public class Base_54147<F, A> {}
public class Derived_54147<F, A>
: Base_54147<Base_54147<F, A>, A>,
Q_54147 {}
public extension Base_54147 where F: Q_54147 {
static func foo(_: F.A) {}
}
extension Derived_54147 where F: P_54147 {
public static func foo(_: A) {}
}
// Make sure we don't crash on generic requirement mismatch
protocol P3 {}
protocol P4 {
associatedtype T
}
class Base {
func method<T: P3>(_: T) {}
func method<T: P4>(_: T) where T.T : P3 {}
}
class Derived: Base {
override func method<T: P3>(_: T) {}
}
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