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0a1905acba
This works around the fact that existential opening does not currently work correctly in cases where the argument isn't resolved before the applicable fn is solved.
53 lines
1.3 KiB
Swift
53 lines
1.3 KiB
Swift
// RUN: %target-typecheck-verify-swift
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protocol P {}
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func g(_: some P) {}
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// expected-note@-1 2{{required by global function 'g' where 'some P' = 'any P'}}
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// rdar://problem/160389221
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func good(_ x: Array<any P>) {
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Array(x).forEach { y in g(y) }
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}
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extension Array {
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var ffirst: Element? { fatalError() }
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func ffirst(wwhere: (Element) -> Bool) -> Element { fatalError() }
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}
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func bad(_ x: Array<any P>) {
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let y = x.ffirst!
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g(y) // ok
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let yy = x.ffirst
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g(yy!) // ok
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// FIXME: This is broken
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g(x.ffirst!)
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// expected-error@-1 {{type 'any P' cannot conform to 'P'}}
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// expected-note@-2 {{only concrete types such as structs, enums and classes can conform to protocols}}
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}
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func testSubscript() {
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struct S1<T> {
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subscript() -> T { fatalError() }
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}
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func foo(_ xs: S1<any P>) {
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g(xs[])
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}
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struct S2<T> {
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subscript() -> Int { fatalError() }
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subscript() -> T { fatalError() }
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}
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func foo(_ xs: S2<any P>) {
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// FIXME: This should work, if you fix this you can also remove the
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// dynamic member lookup hack in `addSubscriptConstraints`, we should always
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// just add the applicable fn as an unsolved constraint before the member.
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g(xs[])
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// expected-error@-1 {{type 'any P' cannot conform to 'P'}}
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// expected-note@-2 {{only concrete types such as structs, enums and classes can conform to protocols}}
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}
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}
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