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3ff1d34bf3
This likely affects other things too, but literals are where it appears most. Previously, the mid-solving literal types like Array<$T0> were just checked for whether they conformed to the protocol, without acknowledging that this might introduce requirements on $T0, instead the conditional requirements were checked against $T0, and so failed (there's no reason that $T0 should satisfy the requirements at all, it's a recently-constructed transient type variable). Instead, capture the requirements and add them as constraints to the type variable. Fixes https://bugs.swift.org/browse/SR-7192 and rdar://problem/38461036 and improves https://bugs.swift.org/browse/SR-6941.
131 lines
4.8 KiB
Swift
131 lines
4.8 KiB
Swift
// RUN: %target-typecheck-verify-swift -typecheck -verify
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// rdar://problem/38461036 , https://bugs.swift.org/browse/SR-7192 and highlights the real problem in https://bugs.swift.org/browse/SR-6941
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protocol SameType {}
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protocol Conforms {}
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struct Works: Hashable, Conforms {}
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struct Fails: Hashable {}
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extension Array: SameType where Element == Works {}
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extension Dictionary: SameType where Value == Works {}
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extension Array: Conforms where Element: Conforms {}
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extension Dictionary: Conforms where Value: Conforms {}
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let works = Works()
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let fails = Fails()
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func arraySameType() {
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let arrayWorks = [works]
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let arrayFails = [fails]
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let _: SameType = [works]
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let _: SameType = [fails]
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// expected-error@-1 {{value of type '[Fails]' does not conform to specified type 'SameType'}}
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let _: SameType = arrayWorks
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let _: SameType = arrayFails
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// expected-error@-1 {{value of type '[Fails]' does not conform to specified type 'SameType'}}
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let _: SameType = [works] as [Works]
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let _: SameType = [fails] as [Fails]
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// expected-error@-1 {{value of type '[Fails]' does not conform to specified type 'SameType'}}
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let _: SameType = [works] as SameType
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let _: SameType = [fails] as SameType
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// expected-error@-1 {{'[Fails]' is not convertible to 'SameType'}}
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let _: SameType = arrayWorks as SameType
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let _: SameType = arrayFails as SameType
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// expected-error@-1 {{'[Fails]' is not convertible to 'SameType'}}
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}
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func dictionarySameType() {
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let dictWorks: [Int : Works] = [0 : works]
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let dictFails: [Int : Fails] = [0 : fails]
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let _: SameType = [0 : works]
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let _: SameType = [0 : fails]
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// expected-error@-1 {{contextual type 'SameType' cannot be used with dictionary literal}}
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let _: SameType = dictWorks
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let _: SameType = dictFails
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// expected-error@-1 {{value of type '[Int : Fails]' does not conform to specified type 'SameType'}}
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let _: SameType = [0 : works] as [Int : Works]
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let _: SameType = [0 : fails] as [Int : Fails]
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// expected-error@-1 {{value of type '[Int : Fails]' does not conform to specified type 'SameType'}}
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let _: SameType = [0 : works] as SameType
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let _: SameType = [0 : fails] as SameType
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// expected-error@-1 {{'[Int : Fails]' is not convertible to 'SameType'}}
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let _: SameType = dictWorks as SameType
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let _: SameType = dictFails as SameType
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// expected-error@-1 {{'[Int : Fails]' is not convertible to 'SameType'}}
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}
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func arrayConforms() {
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let arrayWorks = [works]
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let arrayFails = [fails]
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let _: Conforms = [works]
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let _: Conforms = [fails]
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// expected-error@-1 {{value of type '[Fails]' does not conform to specified type 'Conforms'}}
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let _: Conforms = arrayWorks
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let _: Conforms = arrayFails
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// expected-error@-1 {{value of type '[Fails]' does not conform to specified type 'Conforms'}}
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let _: Conforms = [works] as [Works]
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let _: Conforms = [fails] as [Fails]
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// expected-error@-1 {{value of type '[Fails]' does not conform to specified type 'Conforms'}}
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let _: Conforms = [works] as Conforms
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let _: Conforms = [fails] as Conforms
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// expected-error@-1 {{'[Fails]' is not convertible to 'Conforms'}}
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let _: Conforms = arrayWorks as Conforms
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let _: Conforms = arrayFails as Conforms
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// expected-error@-1 {{'[Fails]' is not convertible to 'Conforms'}}
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}
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func dictionaryConforms() {
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let dictWorks: [Int : Works] = [0 : works]
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let dictFails: [Int : Fails] = [0 : fails]
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let _: Conforms = [0 : works]
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let _: Conforms = [0 : fails]
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// expected-error@-1 {{contextual type 'Conforms' cannot be used with dictionary literal}}
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let _: Conforms = dictWorks
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let _: Conforms = dictFails
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// expected-error@-1 {{value of type '[Int : Fails]' does not conform to specified type 'Conforms'}}
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let _: Conforms = [0 : works] as [Int : Works]
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let _: Conforms = [0 : fails] as [Int : Fails]
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// expected-error@-1 {{value of type '[Int : Fails]' does not conform to specified type 'Conforms'}}
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let _: Conforms = [0 : works] as Conforms
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let _: Conforms = [0 : fails] as Conforms
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// expected-error@-1 {{'[Int : Fails]' is not convertible to 'Conforms'}}
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let _: Conforms = dictWorks as Conforms
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let _: Conforms = dictFails as Conforms
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// expected-error@-1 {{'[Int : Fails]' is not convertible to 'Conforms'}}
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}
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func combined() {
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let _: Conforms = [[0: [1 : [works]]]]
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let _: Conforms = [[0: [1 : [fails]]]]
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// expected-error@-1 {{value of type '[[Int : [Int : [Fails]]]]' does not conform to specified type 'Conforms'}}
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// Needs self conforming protocols:
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let _: Conforms = [[0: [1 : [works]] as Conforms]]
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// expected-error@-1 {{value of type '[[Int : Conforms]]' does not conform to specified type 'Conforms'}}
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let _: Conforms = [[0: [1 : [fails]] as Conforms]]
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// expected-error@-1 {{'[Int : [Fails]]' is not convertible to 'Conforms'}}
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}
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