rustc-ap-rustc_cratesio_shim 254.0.0

Automatically published version of the package `rustc_cratesio_shim` in the rust-lang/rust repository from commit d6720cc810ea3dc9e051a95ff1a8dc9755c3bdb5 The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish