[5.1][TypeChecker] Improve contextual mismatch diagnostics for key path #24328
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Detect situations where key path doesn't have capability required
by the context e.g. read-only vs. writable, or either root or value
types are incorrect e.g.
```swift
struct S { let foo: Int }
let _: WritableKeyPath<S, Int> = \.foo
```
Here context requires a writable key path but `foo` property is
read-only.
(cherry picked from commit 94977ee)
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@swift-ci please test |
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Build failed |
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@swift-ci please test Linux platform |
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Build failed |
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Not my lucky day today... |
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@swift-ci please test Linux platform |
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Build failed |
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@swift-ci please test Linux platform |
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Detect situations where key path doesn't have capability required
by the context e.g. read-only vs. writable, or either root or value
types are incorrect e.g.
Here context requires a writable key path but
fooproperty isread-only.
(cherry picked from commit 94977ee)