rustc-ap-rustc_cratesio_shim 493.0.0

Automatically published version of the package `rustc_cratesio_shim` in the rust-lang/rust repository from commit ad3829fd66e1f0804fc51775e5d58d89f0de825c The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish