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Pavel Yaskevich cbadd7ffc2 [Diagnostics] Correctly identify location of requirement failure

Previously in situations like:

```swift
protocol P {}

struct S<T: P> {
  var value: T
}

_ = S(value: 42)
```

Diagnostic has reported a problem as related to "reference" to `init`
but the failing generic type requirement belongs to `S`, so a
better diagnostic in such case should mention `generic struct S`.

2019-08-16 22:02:37 -07:00

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 // RUN: %target-typecheck-verify-swift
 protocol P {}
 struct S<V> where V: P { // expected-note {{where 'V' = 'Double'}}
   var value: V
 }
 struct A {
   subscript<T>(_ v: S<T>) -> A {
     fatalError()
   }
 }
 func foo(_ v: Double) {
   _ = A()[S(value: v)]
  // expected-error@-1 {{generic struct 'S' requires that 'Double' conform to 'P'}}
 }