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Kavon Farvardin
d46a86e5b1
A requirement defines the maximal effects that a witness can have. In some cases, we'd fail to properly reject such a witness with more effects, when that witness is valid for another requirement within that protocol. Thus, we'd hit an assertion failure in that case rather than permitting the valid program to compile. In a non-asserts compiler, we could end up failing to diagnose an invalid chosen witness and crash in IRGen. https://github.com/apple/swift/issues/73479 rdar://127669069
43 lines
1.2 KiB
Swift
43 lines
1.2 KiB
Swift
// RUN: %target-typecheck-verify-swift -verify-ignore-unrelated
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// https://github.com/swiftlang/swift/issues/86105
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protocol P {
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func perform(_ body: () -> Void) -> Void
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// expected-note@-1 {{protocol requires function 'perform' with type '(() -> Void) -> Void'}}
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}
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struct S {
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func perform<E: Error>(_ body: () throws(E) -> Void) throws(E) -> Void {
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// expected-note@-1 {{candidate throws, but protocol does not allow it}}
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try body()
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}
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}
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extension S: P {}
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// expected-error@-1 {{type 'S' does not conform to protocol 'P'}}
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// expected-note@-2 {{add stubs for conformance}}
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// https://github.com/swiftlang/swift/issues/73479
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protocol P1: AsyncIteratorProtocol {
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mutating func next() async -> Element?
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}
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struct S2: P1 {
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mutating func next() async -> Int? {
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return nil
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}
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}
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public protocol Functor<A> {
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associatedtype FA: Functor = Self
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associatedtype A
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func map<B>(_ f: (A) -> B) -> FA where FA.A == B // expected-note {{protocol requires function 'map' with type}}
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}
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extension Optional : Functor {
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// expected-error@-1 {{type 'Optional<Wrapped>' does not conform to protocol 'Functor'}}
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// expected-note@-2 {{add stubs for conformance}}
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public typealias A = Wrapped
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}
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