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2e5799e26b
We don't allow things like
extension Type: P where Param: P {}
extension Type: P where Param: Q {}
or
extension Type: P where Param == Int {}
extension Type: P where Param == Float {}
or
extension Type: P where Param: P {}
extension Type: P where Param == SomethingThatIsntP {}
and the default error message "redundant conformance" message doesn't convey
this very well.
Fixes rdar://problem/36262409.
68 lines
3.7 KiB
Swift
68 lines
3.7 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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