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In the included test case, conformance checking of Wrapper : B would pick up typealias Foo as a witness for the associated type B.Foo. However, this typealias Foo is defined in a constrained extension where T : A, and the underlying type references the associated type A.Foo on T. The resulting substitution is invalid when the conformance Wrapper : B is used in a context where T does not conform to A. Instead, we should ignore this typealias entirely, since it appears in an unusable constrained extension. Fixes <rdar://problem/60219705>, <https://bugs.swift.org/browse/SR-12327>, <https://bugs.swift.org/browse/SR-12663>.
58 lines
978 B
Swift
58 lines
978 B
Swift
// RUN: not %target-swift-frontend -emit-ir %s
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// Just make sure we don't crash.
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protocol Publicable {
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associatedtype PublicModel
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func publicized() -> PublicModel
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}
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protocol WithReturnType {
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associatedtype MainType
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associatedtype ReturnType
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func returnTheThing()
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}
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extension WithReturnType where MainType: Publicable {
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typealias ReturnType = MainType.PublicModel
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func returnTheThing() {
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print("publicable")
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}
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}
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extension WithReturnType {
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func returnTheThing() {
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print("not publicable")
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}
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}
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extension String: Publicable {
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struct PublicString {
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let inner: String
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init(str: String) {
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self.inner = "Public: \(str)"
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}
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}
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func publicized() -> PublicString {
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return PublicString(str: self)
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}
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}
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struct Controller<T> {
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}
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extension Controller: WithReturnType {
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typealias MainType = T
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}
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let controller = Controller<String>()
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controller.returnTheThing()
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