rustc-ap-rustc_cratesio_shim 451.0.0

Automatically published version of the package `rustc_cratesio_shim` in the rust-lang/rust repository from commit 180edc21eeca50d0d597de091c8eb712667b5dd2 The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish