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// RUN: %target-typecheck-verify-swift
protocol P {
associatedtype T = Int
func hasDefault()
func returnsSelf() -> Self
func hasDefaultTakesT(_: T)
func returnsSelfTakesT(_: T) -> Self
subscript(_: T) -> Self { get }
}
extension P {
func hasDefault() {}
func returnsSelf() -> Self {
return self
}
func hasDefaultTakesT(_: T) {}
func returnsSelfTakesT(_: T) -> Self { // expected-note {{'returnsSelfTakesT' declared here}}
return self
}
subscript(_: T) -> Self { self } // expected-note {{'subscript(_:)' declared here}}
}
// This fails
class Class : P {}
// expected-error@-1 {{method 'returnsSelfTakesT' in non-final class 'Class' cannot be implemented in a protocol extension because it returns 'Self' and has associated type requirements}}
// expected-error@-2 {{subscript 'subscript(_:)' in non-final class 'Class' cannot be implemented in a protocol extension because it returns 'Self' and has associated type requirements}}
// This succeeds, because the class is final
final class FinalClass : P {}
// This succeeds, because we're not using the default implementations
class NonFinalClass : P {
// FIXME: An explicit type witness is necessary to avoid an unrelated
// associated type inference bug.
typealias T = Never
func returnsSelfTakesT(_: T) -> Self {
return self
}
subscript(_: T) -> Self { self }
}
// (https://github.com/apple/swift/issues/49965) Test for default implementation
// that comes from a constrained extension.
// FIXME: Better error message here?
class SillyClass {}
protocol HasDefault {
func foo()
// expected-note@-1 {{protocol requires function 'foo()' with type '() -> ()'}}
}
extension HasDefault where Self == SillyClass {
func foo() {}
// expected-note@-1 {{candidate would match if 'SillyClass' conformed to 'HasDefault'}}
}
extension SillyClass : HasDefault {}
// expected-error@-1 {{type 'SillyClass' does not conform to protocol 'HasDefault'}}
// expected-note@-2 {{add stubs for conformance}}
// This is OK, though
class SeriousClass {}
extension HasDefault where Self : SeriousClass {
func foo() {}
// expected-note@-1 {{candidate would match if 'SillyClass' subclassed 'SeriousClass'}}
}
extension SeriousClass : HasDefault {}
// https://github.com/apple/swift/issues/49971
protocol Node {
associatedtype ValueType = Int
func addChild<ChildType>(_ child: ChildType)
where ChildType: Node, ChildType.ValueType == Self.ValueType
}
extension Node {
func addChild<ChildType>(_ child: ChildType)
where ChildType: Node, ChildType.ValueType == Self.ValueType {}
}
class IntNode: Node {}
// https://github.com/apple/swift/issues/51408
protocol P_51408 {
associatedtype A
func f(_ x: A) -> Self
}
struct S : P_51408 {
func f(_ x: Bool) -> S {}
}
class C1_51408 : P_51408 {
func f(_ x: Bool) -> C1_51408 {} // expected-error {{method 'f' in non-final class 'C1_51408' must return 'Self' to conform to protocol 'P_51408'}}
}
final class C2_51408 : P_51408 {
func f(_ x: Bool) -> C2_51408 {}
}
class C3_51408 : P_51408 {
func f(_ x: Bool) -> Self {}
}
protocol P_51408_Complex {
associatedtype A
func f() -> (A, Self?)
}
final class C_51408_Complex : P_51408_Complex {
func f() -> (Bool, C_51408_Complex?) {}
}
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