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In https://github.com/apple/swift/pull/63898 conformance requirement typechecking was relaxed to allow unavailable decls to witness conformance requirements as long as the conforming nominal was also unavailable. However, only nominals that were directly marked unavailable were accepted. Nominals that are declared in unavailable scopes should also be allowed to have unavailable wintesses. Resolves rdar://107052715
94 lines
2.9 KiB
Swift
94 lines
2.9 KiB
Swift
// RUN: %target-typecheck-verify-swift -swift-version 4 -enable-objc-interop
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// An @objc protocol can have 'unavailable'
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// methods. They are treated as if they
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// were marked optional
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@objc protocol Proto {
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@objc @available(*,unavailable) optional func bad()
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func good()
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}
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class Foo : Proto {
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@objc func good() {}
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}
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// Reject protocols with 'unavailable' requirements
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// if a protocol is not marked @objc.
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protocol NonObjCProto {
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@available(*,unavailable) func bad() // expected-error {{protocol members can only be marked unavailable in an @objc protocol}} expected-note {{protocol requires function 'bad()'}}
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func good()
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}
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class Bar : NonObjCProto { // expected-error {{type 'Bar' does not conform to protocol 'NonObjCProto'}}
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func good() {}
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}
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// Complain about unavailable witnesses (error in Swift 4, warning in Swift 3)
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protocol P {
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func foo(bar: Foo) // expected-note 2 {{requirement 'foo(bar:)' declared here}}
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}
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struct ConformsToP : P { // expected-error{{type 'ConformsToP' does not conform to protocol 'P'}}
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@available(*, unavailable)
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func foo(bar: Foo) { } // expected-error{{unavailable instance method 'foo(bar:)' was used to satisfy a requirement of protocol 'P'}}
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}
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struct ConformsToP2 {
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@available(*, unavailable)
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func foo(bar: Foo) { } // expected-note {{'foo(bar:)' declared here}}
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}
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extension ConformsToP2: P {} // expected-error{{type 'ConformsToP2' does not conform to protocol 'P'}}
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// expected-error@-1 {{unavailable instance method 'foo(bar:)' was used to satisfy a requirement of protocol 'P'}}
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@available(*, unavailable)
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struct ConformsToP3: P {
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func foo(bar: Foo) { }
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}
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// Ok, an unavailable decl should be allowed to witness a requirement when the
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// conforming type is itself unavailable.
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@available(*, unavailable)
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struct ConformsToP4: P {
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@available(*, unavailable)
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func foo(bar: Foo) { }
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}
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struct ConformsToP5 {}
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// Ok, an unavailable decl should be allowed to witness a requirement when the
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// conformance extension is itself unavailable.
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@available(*, unavailable)
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extension ConformsToP5: P {
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@available(*, unavailable)
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func foo(bar: Foo) { }
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}
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@available(*, unavailable)
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enum UnavailableEnum {
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struct ConformsToP6: P {
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@available(*, unavailable)
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func foo(bar: Foo) { }
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}
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}
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// Include message string from @available attribute if provided
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protocol Unavail {
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associatedtype T
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func req() // expected-note {{requirement 'req()' declared here}}
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}
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extension Unavail {
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func req() {}
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}
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extension Unavail where T == Self {
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@available(*, unavailable, message: "write it yourself") func req() {} // expected-note {{'req()' declared here}}
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}
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struct NonSelfT: Unavail {
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typealias T = Int
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}
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struct SelfT: Unavail { // expected-error {{type 'SelfT' does not conform to protocol 'Unavail'}}
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// expected-error@-1 {{unavailable instance method 'req()' was used to satisfy a requirement of protocol 'Unavail': write it yourself}}
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typealias T = SelfT
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}
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