Pavel Yaskevich 94977ee175 [TypeChecker] Improve contextual mismatch diagnostics for key path ...

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.

2019-04-26 10:59:01 -07:00

19 KiB

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