Rust pop quiz: `struct Foo {x: [u8], y: [u8]}`. `Box<Foo>` is:
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Also I don't think Foo can even exist even if only b was? Only generic types can really be unsized.
IIRC any struct can become unsized by containing an unsized type, but it must be the last field.
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the problem is there's no way to init it (without unsafe casts). You need to take a Foo<[u8; n]> and cast to Foo<[u8]>.
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Oh, you mean construction. Well. Yes.
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