rustc-ap-rustc_cratesio_shim 321.0.0

Automatically published version of the package `rustc_cratesio_shim` in the rust-lang/rust repository from commit abaa9344d4c10a45d7725534145007a8284dabe8 The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish