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If we fail to build a generic signature (or requirement signature of a protocol) because of a request cycle or because Knuth-Bendix completion failed, we would create a placeholder signature with no requirements. However in a move-only world, a completely unconstrained generic parameter might generate spurious diagnostics when used in a copyable way. For this reason, let's outfit these placeholder signatures with a default set of conformance requirements to Copyable and Escapable.
18 lines
711 B
Swift
18 lines
711 B
Swift
// RUN: %target-typecheck-verify-swift
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// https://github.com/apple/swift/issues/49119
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protocol P {
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associatedtype A: P // expected-note {{protocol requires nested type 'A'; add nested type 'A' for conformance}}
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}
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struct Type<Param> {}
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extension Type: P where Param: P, Param.A == Type<Param> {
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// expected-error@-1 {{extension of generic struct 'Type' has self-referential generic requirements}}
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// expected-note@-2 {{through reference here}}
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// expected-error@-3 {{type 'Type<Param>' does not conform to protocol 'P'}}
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typealias A = Param
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// expected-note@-1 2{{through reference here}}
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// expected-note@-2 {{possibly intended match 'Type<Param>.A' (aka 'Param') does not conform to 'P'}}
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}
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