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9695b1957a
If you have generic parameters <T, U> and requirements of the form: - T : P - T == ConcreteType<U> - T.[P]U : SomeClass - T.[P]U : SomeProto And furthermore SomeClass does not conform to SomeProto, we can't leave `T.[P]U : SomeClass` unsubstituted; we still have to replace `T` with `ConcreteType<U>` to transform the latter two requirements into: - U : SomeClass - U : SomeProto "Concrete contraction" is easily the hackiest part of the Requirement Machine; I need to come up with a more principled solution for the problem that it solves sooner or later. Fixes rdar://problem/94150249.
30 lines
634 B
Swift
30 lines
634 B
Swift
// RUN: %target-swift-frontend -typecheck %s -debug-generic-signatures 2>&1 | %FileCheck %s
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protocol P1 {
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associatedtype Value
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}
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protocol P2 {
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associatedtype Value
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}
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class G<Value> : P2 {}
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protocol P3 {}
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class C {}
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extension P1 where Value: P2 {
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typealias Element = Value.Value
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// Make sure we can resolve 'Element' to 'V' on the left hand side of 'Element: P3'.
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// CHECK-LABEL: .P1 extension.set()@
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// CHECK-NEXT: Generic signature: <Self, V where Self : P1, V : C, V : P3, Self.[P1]Value == G<V>>
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func set<V>() where Element: P3 & C, Value == G<V> {
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takeP3(V.self)
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}
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}
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func takeP3<T : P3>(_: T.Type) {}
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