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eeb8f330f9
It's not clear whether we'll actually need this feature in the long run, but we certainly need it now because non-@usableFromInline members can (currently) satisfy public requirements when a @usableFromInline internal type conforms to a public protocol. In these cases, we'll treat the witnesses as present but opaque, and clients will perform dynamic dispatch when using them even when a generic function gets specialized. With this, we're able to generate a textual interface for the standard library, compile it back to a swiftmodule, and use it to build a Hello World program!