DST custom coercions. #982
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Custom coercions allow smart pointers to fully participate in the DST system. In particular, they allow practical use of `Rc<T>` and `Arc<T>` where `T` is unsized. This RFC subsumes part of [RFC 401 coercions](https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md).
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