Pavel Yaskevich c5ae6c96a9 [ConstraintSystem] Detect missing/extraneous arguments even if there is optional injection required ...

If parameter type is optional let's ignore that since argument could
be either optional itself or be injected into optional implicitly.

```swift
func foo(_: ((Int, Int) -> Void)!) {}

foo { _ in } // Missing second closure parameter
```

2020-02-05 12:11:01 -08:00

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