Victor Guerra 459181178e [Diagnostics] Add a fix-it for try instead of throws in function decl… (#27647) ...

* [Diagnostics] Add a fix-it for try instead of throws in function decls and types.

Sometimes one would misstype `throws` for `try` so we provide a fix-it for that.
It might happen in two cases:

In function declarations:
```swift
func foo() try {}
```

In function types:
```swift
let f = () try -> Int
```

Resolves SR-11574.

2019-10-17 01:19:28 +02:00

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