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[6.0][Conformance] Always downgrade redundant conformances to marker protocols to a warning. #75426

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Merged
hborla merged 2 commits into from
Jul 24, 2024
Merged

[6.0][Conformance] Always downgrade redundant conformances to marker protocols to a warning. #75426

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42277cf
[Conformance] Always downgrade redundant conformances to marker proto…
hborla Jul 23, 2024
39345fe
[NFC][Copyable] Update an expected error to a warning.
hborla Jul 23, 2024
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2 changes: 1 addition & 1 deletion lib/Sema/TypeCheckProtocol.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -6283,7 +6283,7 @@ void TypeChecker::checkConformancesInContext(IterableDeclContext *idc) {
}

if ((existingModule != dc->getParentModule() && conformanceInOrigModule) ||
isSendable) {
diag.Protocol->isMarkerProtocol()) {
// Warn about the conformance.
if (isSendable && SendableConformance &&
isa<InheritedProtocolConformance>(SendableConformance)) {
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2 changes: 1 addition & 1 deletion test/Parse/inverses.swift
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Expand Up @@ -143,7 +143,7 @@ struct Burrito<Filling: ~Copyable>: ~Copyable {}
extension Burrito: Alias {} // expected-error {{conformance to 'Copyable' must be declared in a separate extension}}
// expected-note@-1 {{'Burrito<Filling>' declares conformance to protocol 'Copyable' here}}

extension Burrito: Copyable & Edible & P {} // expected-error {{redundant conformance of 'Burrito<Filling>' to protocol 'Copyable'}}
extension Burrito: Copyable & Edible & P {} // expected-warning {{redundant conformance of 'Burrito<Filling>' to protocol 'Copyable'}}

struct Blah<T: ~Copyable>: ~Copyable {}
extension Blah: P, Q, Copyable, R {} // expected-error {{generic struct 'Blah' required to be 'Copyable' but is marked with '~Copyable'}}
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7 changes: 7 additions & 0 deletions test/decl/protocol/conforms/redundant_conformance.swift
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Expand Up @@ -86,3 +86,10 @@ class Class3 {
class SomeMockClass: Class3.ProviderThree { // okay
var someInt: Int = 5
}


class ImplicitCopyable {}

class InheritImplicitCopyable: ImplicitCopyable, Copyable {}
// expected-warning@-1 {{redundant conformance of 'InheritImplicitCopyable' to protocol 'Copyable'}}
// expected-note@-2 {{'InheritImplicitCopyable' inherits conformance to protocol 'Copyable' from superclass here}}