Huon Wilson b96aedaf64 [Sema] Match Swift 4.0/4.1 overloading behaviour for properties in extensions of generic types. ...

The patch that nailed down our semantics here missed an additional case that
required a compatibility hack: a property on a generic type and a same-named one
in an (unconstrained) extension:

    struct Foo<T> {
        var x: Int { return 0 }
    }
    extension Foo {
        var x: Bool { return false }
    }

Fixes rdar://problem/40685642.

2018-06-22 08:43:34 +10:00

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