rustc-ap-rustc_cratesio_shim 315.0.0

Automatically published version of the package `rustc_cratesio_shim` in the rust-lang/rust repository from commit 748d354af3145d4292ea84142f73bb8114e3db12 The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish