rustc-ap-serialize 121.0.0

Automatically published version of the package `serialize` in the rust-lang/rust repository from commit 91db9dcf3730207f63b3dfc33b2c438a769b7517 Thie publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish
docs.rs failed to build rustc-ap-serialize-121.0.0
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Support code for encoding and decoding types.