rustc-ap-serialize 576.0.0

Automatically published version of the package `serialize` in the rust-lang/rust repository from commit 59cc53e6e708e9b9e86822c1b4d69f28f6c45eae The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish

Support code for encoding and decoding types.