[swift-evolution] [Draft] open and public protocols

[Adrian Zubarev]

struct A : _ExpressibleByBuiltinIntegerLiteral {
    init() {}
    init(_builtinIntegerLiteral value: _MaxBuiltinIntegerType) {}
}

struct B : ExpressibleByIntegerLiteral {
    init(integerLiteral value: A) {}
}

B(integerLiteral: A())
Here is another example. Am I supposed to do that? Definitely not. Your lovely question: Why not? Because the protocol starts with an underscore. So? Doesn’t prevent me from abusing all semi-hidden protocols.

Where is the enum now to stop me from doing this?

Enums are so heavily abused in Swift, just because they have a special ability not being extensible with a constructor.
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