Possible feature: deriving std::io::{Read, Write}

[saghm]

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I'm not sure if this has been proposed before, but has there been any thought to implementing support for deriving the Read and Write traits from std::io? I think it might be useful to save boilerplate when making an enum where each of the variants contains something that implements Read/Write.

[JelteF]

The first step would be to implement those for newtypes, which should be fairly simple. But the other part of your idea is quite interesting: deriving traits for an enum where each of the variants implement that trait. Deriving for an enum containing only newtypes like deriving for a newtype.