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16 lines
393 B
Swift
16 lines
393 B
Swift
// RUN: %target-swift-frontend -emit-ir %s
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// https://github.com/apple/swift/issues/56124
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protocol Projection {
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associatedtype Root
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associatedtype Path: PartialKeyPath<Root>
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static var path: Path { get }
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}
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struct ProjectKey<Key, Value>: Projection {
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typealias Root = (Key, Value)
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typealias Path = KeyPath<(Key, Value), Key>
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static var path: KeyPath<(Key, Value), Key> { \.0 }
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}
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