Pavel Yaskevich b9a0ca6afb [ConstraintSystem] Detect and diagnose conversion failures related to collection element types ...

Detect and diagnose a contextual mismatch between expected
collection element type and the one provided (e.g. source
of the assignment or argument to a call) e.g.:

```swift
let _: [Int] = ["hello"]

func foo(_: [Int]) {}
foo(["hello"])
```

2019-05-14 17:33:11 -07:00

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