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We can't simply emit the desugared, expanded version of the requirements because there's no way to pretty-print the type `some ~Copyable` when the `~Copyable`'s get replaced with the absence of `Copyable`. We'd be left with just `some _` or need to invent a new top type so we can write `some Top`. Thus, it's best to simply reverse the expansion of default requirements when emitting a swiftinterface file.