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bd9b18ef65
This was fixed by pull request #26174, but the test case there was specific to property wrappers, while the fix also addresses issues with other ambiguity name lookups such as protocol names in an inheritance clause.
89 lines
4.1 KiB
Swift
89 lines
4.1 KiB
Swift
// RUN: %empty-directory(%t)
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// RUN: %target-swift-frontend -emit-module -o %t %S/Inputs/redundant_conformance_A.swift
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// RUN: %target-swift-frontend -emit-module -o %t -I %t %S/Inputs/redundant_conformance_B.swift
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// RUN: %target-typecheck-verify-swift -I %t
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import redundant_conformance_A
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import redundant_conformance_B
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extension ConformsToP
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: P1 { // expected-warning{{conformance of 'ConformsToP' to protocol 'P1' was already stated in the type's module 'redundant_conformance_A'}}
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typealias A = Double // expected-note{{type alias 'A' will not be used to satisfy the conformance to 'P1'}}
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func f() -> Double { return 0.0 } // expected-note{{instance method 'f()' will not be used to satisfy the conformance to 'P1'}}
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// expected-note@-1{{found this candidate}}
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}
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extension ConformsToP
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: P2 { // expected-warning{{conformance of 'ConformsToP' to protocol 'P2' was already stated in the protocol's module 'redundant_conformance_B'}}
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}
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extension OtherConformsToP : P1 { // expected-error{{redundant conformance of 'OtherConformsToP' to protocol 'P1'}}
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func f() -> Int { return 0 }
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}
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func testConformsToP(cp1: ConformsToP, ocp1: OtherConformsToP) {
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// Note:
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let _ = cp1.f() // expected-error{{ambiguous use of 'f()'}}
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let _ = ocp1.f() // okay: picks "our" OtherConformsToP.f()
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}
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// slightly different error messages for conditional conformances:
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extension GenericConformsToP: P1 where T: P1 {
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// expected-warning@-1{{conformance of 'GenericConformsToP<T>' to protocol 'P1' conflicts with that stated in the type's module 'redundant_conformance_A' and will be ignored; there cannot be more than one conformance, even with different conditional bounds}}
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typealias A = Double
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// expected-note@-1{{type alias 'A' will not be used to satisfy the conformance to 'P1'}}
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func f() -> Double { return 0.0 }
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// expected-note@-1{{instance method 'f()' will not be used to satisfy the conformance to 'P1'}}
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}
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extension GenericConformsToP: P2 where T: P1 {
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// expected-warning@-1{{conformance of 'GenericConformsToP<T>' to protocol 'P2' conflicts with that stated in the protocol's module 'redundant_conformance_B' and will be ignored; there cannot be more than one conformance, even with different conditional bounds}}
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}
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extension OtherGenericConformsToP: P1 where T: P1 {
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// expected-error@-1{{conflicting conformance of 'OtherGenericConformsToP<T>' to protocol 'P1'; there cannot be more than one conformance, even with different conditional bounds}}
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typealias A = Double
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func f() -> Double { return 0.0 }
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}
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extension GenericConditionalConformsToP: P1 {
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// expected-warning@-1{{conformance of 'GenericConditionalConformsToP<T>' to protocol 'P1' conflicts with that stated in the type's module 'redundant_conformance_A' and will be ignored; there cannot be more than one conformance, even with different conditional bounds}}
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typealias A = Double
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// expected-note@-1{{type alias 'A' will not be used to satisfy the conformance to 'P1'}}
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func f() -> Double { return 0.0 }
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// expected-note@-1{{instance method 'f()' will not be used to satisfy the conformance to 'P1'}}
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}
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extension GenericConditionalConformsToP: P2 {
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// expected-warning@-1{{conformance of 'GenericConditionalConformsToP<T>' to protocol 'P2' conflicts with that stated in the protocol's module 'redundant_conformance_B' and will be ignored; there cannot be more than one conformance, even with different conditional bounds}}
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}
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extension OtherGenericConditionalConformsToP: P1 {
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// expected-error@-1{{conflicting conformance of 'OtherGenericConditionalConformsToP<T>' to protocol 'P1'; there cannot be more than one conformance, even with different conditional bounds}}
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typealias A = Double
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func f() -> Double { return 0.0 }
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}
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// FB6114209: spurious ambiguity errors
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protocol MyUsefulProtocol {
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var someInt: Int { get }
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}
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class Class1 {
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typealias ProviderOne = MyUsefulProtocol
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}
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class Class2 {
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typealias ProviderTwo = MyUsefulProtocol
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}
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class Class3 {
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typealias ProviderThree = Class1.ProviderOne & Class2.ProviderTwo
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}
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class SomeMockClass: Class3.ProviderThree { // okay
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var someInt: Int = 5
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}
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