rustc-ap-serialize 616.0.0

Automatically published version of the package `serialize` in the rust-lang/rust repository from commit da59656b3b2e2469d9bdae3c9c9e8cbacdd5e6f6 The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish

Support code for encoding and decoding types.