Yuki Okushi 39af66f651
Rollup merge of #83160 - m-ou-se:deprecate-rustc-serialize-derives, r=petrochenkov
Deprecate RustcEncodable and RustcDecodable.

We can't remove the `RustcEncodable` and `RustcDecodable` derive macros from the prelude, but we can deprecate them.
2021-03-16 23:54:00 +09:00
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