Fix solution application for keypath function subtype conversions #71737
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In swiftlang#39612 we added subtyping for keypaths-as-functions, but during application the implementation naively coerced the keypath expression itself to the inferred supertype, resulting in erroneous results. This patch updates the solution application logic to build the keypath-function conversion expression based entirely on the 'natural' keypath type, only converting to the inferred supertype at the end via the usual coerceToType machinery for function conversions.
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@swift-ci please test |
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@swift-ci please test source compatibility |
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@xedin would love your eyes here when you have a chance! |
xedin
approved these changes
Feb 19, 2024
| struct Test { | ||
| var codingStack: [CodingStackEntry] | ||
| var codingPath: [any CodingKey] { codingStack.map(\.key) } | ||
| // CHECK: keypath $KeyPath<CodingStackEntry, URICoderCodingKey>, (root $CodingStackEntry; stored_property #CodingStackEntry.key : $URICoderCodingKey) |
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Let's add a test-case with optional promotion as well for completeness.
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@swift-ci please build toolchain macOS platform |
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@swift-ci please test macOS platform |
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@swift-ci please test Linux platform |
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All of the source compatibility failures are macro related, including penny-bot |
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@xedin as in, there's an unrelated macro issue here? Or you suspect this patch is somehow interfering with macro logic? |
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Macro issue is unrelated, I saw this happen in other PRs. |
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@swift-ci please smoke test macOS platform |
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In #39612 we added subtyping for keypath-function conversions. However the implementation naively coerced the keypath expression itself to the inferred supertype, resulting in erroneous results. This patch updates the solution application logic to build the keypath-function conversion expression based entirely on the 'natural' keypath type, only converting to the inferred supertype at the end via the usual coerceToType machinery for function conversions.
Resolves #71423