David Farler 0c48f71384 Migrator/QoI: Function input type: Don't fix Void to (Void), but fix (Void) to () ...

```swift
func foo(f: Void) -> ()) {}
```

This compiler currently suggests we change this to:

```swift
func foo(f: (Void) -> ()) {}
```

That's `(()) -> ()`, almost certainly not what someone wants in Swift
4. We should suggest changing that to:
```swift
func foo(f: () -> ()) {}
```

Additionally,

```swift
func foo(f: (Void) -> ()) {}
```

Should trigger a warning that the `(Void)` input type is `(())`, and you
can't supply `()` to it in Swift 4, and suggest a fix-it change it to:

```swift
func foo(f: () -> ()) {}
```

rdar://problem/32143617

2017-05-13 17:36:28 -07:00

2.4 KiB

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