rustc-ap-rustc_cratesio_shim 255.0.0

Automatically published version of the package `rustc_cratesio_shim` in the rust-lang/rust repository from commit a2b991b5305b770c7d5288ab3aa231428511c530 The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish