Answer: (d). Structs may only have one dynamically sized field, and it must be at the end. No fundamental reason why this cannot be improvedhttps://twitter.com/ManishEarth/status/826901138347683841 …
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You can't. It has to be generic (`Foo<T: ?Sized> {x: T}`) and then you can CoerceUnsized it.
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