rustc-ap-rustc_cratesio_shim 208.0.0

Automatically published version of the package `rustc_cratesio_shim` in the rust-lang/rust repository from commit 6a1c0637ce44aeea6c60527f4c0e7fb33f2bcd0d The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish