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8bbfaf38e0
In apple/swift#41054, we fixed an oversight which caused us to not notice when a user erased a concrete type to an existential using an unavailable conformance. Unfortunately, this is source-breaking and needs to be reduced to a warning in Swift 5 mode unless the user opts in. Fixes rdar://91940820.
85 lines
3.7 KiB
Swift
85 lines
3.7 KiB
Swift
// RUN: %target-typecheck-verify-swift -swift-version 5
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// REQUIRES: OS=macosx
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public protocol Horse {}
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func takesHorse<T : Horse>(_: T) {}
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func takesHorseExistential(_: Horse) {}
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extension Horse {
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func giddyUp() {}
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var isGalloping: Bool { true }
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}
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struct UsesHorse<T : Horse> {}
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// Availability with version
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public struct HasAvailableConformance1 {}
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@available(macOS 100, *)
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extension HasAvailableConformance1 : Horse {}
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// These availability violations are warnings because this test does not
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// pass the -enable-conformance-availability-errors flag. See the other
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// test case in test/Sema/conformance_availability.swift for the same
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// example but with this flag.
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func passAvailableConformance1(x: HasAvailableConformance1) { // expected-note 6{{add @available attribute to enclosing global function}}
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takesHorse(x) // expected-warning {{conformance of 'HasAvailableConformance1' to 'Horse' is only available in macOS 100 or newer}}
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// expected-note@-1 {{add 'if #available' version check}}
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takesHorseExistential(x) // expected-warning {{conformance of 'HasAvailableConformance1' to 'Horse' is only available in macOS 100 or newer}}
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// expected-note@-1 {{add 'if #available' version check}}
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x.giddyUp() // expected-warning {{conformance of 'HasAvailableConformance1' to 'Horse' is only available in macOS 100 or newer}}
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// expected-note@-1 {{add 'if #available' version check}}
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_ = x.isGalloping // expected-warning {{conformance of 'HasAvailableConformance1' to 'Horse' is only available in macOS 100 or newer}}
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// expected-note@-1 {{add 'if #available' version check}}
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_ = x[keyPath: \.isGalloping] // expected-warning {{conformance of 'HasAvailableConformance1' to 'Horse' is only available in macOS 100 or newer}}
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// expected-note@-1 {{add 'if #available' version check}}
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_ = UsesHorse<HasAvailableConformance1>.self // expected-warning {{conformance of 'HasAvailableConformance1' to 'Horse' is only available in macOS 100 or newer}}
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// expected-note@-1 {{add 'if #available' version check}}
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}
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@available(macOS 100, *)
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func passAvailableConformance1a(x: HasAvailableConformance1) {
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takesHorse(x)
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takesHorseExistential(x)
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x.giddyUp()
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_ = x.isGalloping
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_ = UsesHorse<HasAvailableConformance1>.self
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}
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// Explicit unavailability
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public struct HasAvailableConformance2 {}
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@available(*, unavailable)
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extension HasAvailableConformance2 : Horse {} // expected-note 6 {{conformance of 'HasAvailableConformance2' to 'Horse' has been explicitly marked unavailable here}}
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// Some availability diagnostics become warnings in Swift 5 mode without
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// -enable-conformance-availability-errors because they were incorrectly
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// accepted before and rejecting them would break source compatibility. Others
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// are unaffected because they have always been rejected.
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func passAvailableConformance2(x: HasAvailableConformance2) {
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takesHorse(x) // expected-error {{conformance of 'HasAvailableConformance2' to 'Horse' is unavailable}}
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takesHorseExistential(x) // expected-warning {{conformance of 'HasAvailableConformance2' to 'Horse' is unavailable; this is an error in Swift 6}}
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x.giddyUp() // expected-error {{conformance of 'HasAvailableConformance2' to 'Horse' is unavailable}}
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_ = x.isGalloping // expected-error {{conformance of 'HasAvailableConformance2' to 'Horse' is unavailable}}
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_ = x[keyPath: \.isGalloping] // expected-error {{conformance of 'HasAvailableConformance2' to 'Horse' is unavailable}}
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_ = UsesHorse<HasAvailableConformance2>.self // expected-error {{conformance of 'HasAvailableConformance2' to 'Horse' is unavailable}}
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}
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@available(*, unavailable)
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func passAvailableConformance2a(x: HasAvailableConformance2) {
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takesHorse(x)
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takesHorseExistential(x)
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x.giddyUp()
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_ = x.isGalloping
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_ = UsesHorse<HasAvailableConformance2>.self
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}
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