Pavel Yaskevich d111f119d8 [ConstraintSystem] Detect and diagnose inability to infer type of closure parameter(s) ...

Detect situation when it's impossible to determine types for
closure parameters used in the body from the context. E.g.
when a call closure is associated with refers to a missing
member.

```swift
struct S {
}

S.foo { a, b in } // `S` doesn't have static member `foo`

let _ = { v in } // not enough context to infer type of `v`

_ = .foo { v in } // base type for `.foo` couldn't be determined
```

Resolves: [SR-12815](https://bugs.swift.org/browse/SR-12815)
Resolves: rdar://problem/63230293

2020-05-15 01:14:30 -07:00

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