Pavel Yaskevich d6a3a31ae9 [ConstraintSystem] Detect and fix use of method references in key path ...

Referencing (instance or static) methods in the key path is not
currently allowed, solver should be responsible for early detection
and diagnosis of both standalone e.g. `\.foo` and chained
e.g. `\.foo.bar` (where foo is a method) references in key path
components.

```swift
struct S {
  func foo() -> Int { return 42 }
}

let _: KeyPath<S, Int> = \.foo
```

Resolves: rdar://problem/49413561

2019-04-22 14:56:15 -07:00

260 KiB

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