rustc-ap-rustc_cratesio_shim 278.0.0

Automatically published version of the package `rustc_cratesio_shim` in the rust-lang/rust repository from commit 10f42cbde015c44a019e8b6dceca472a1532f36a The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish