Alex Hoppen d944b8bd49 [Refactoring] Use internal completion handler labels for async function's return type ...

If a completion handler specifies internal parameter labels, we can use those to label the elements of the tuple returned by the async alternative.

For example
```swift
func foo(completion: (_ first: String, _ second: String) -> Void) { }
```
gets refactored to
```swift
func foo() async -> (first: String, second: String) { }
```

Resolves rdar://77268040

2021-06-24 08:00:28 +02:00

270 KiB

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