[swift-evolution] [Draft Proposal] Improve protocol inheritance behaviour

[Nevin Brackett-Rozinsky]

Also, you don’t have to go through a superclass method to see the
problematic behavior. You can simply use a subclass instance in a variable
of superclass type:

let subclass: MyClass = MySubclass()
subclass.doTheSecondThing()
// Prints “The 'DEFAULT' 2nd method”

Nevin
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