rustc-ap-rustc_cratesio_shim 406.0.0

Automatically published version of the package `rustc_cratesio_shim` in the rust-lang/rust repository from commit f8860f217dda287600b2b2f1812d3026aa0d35d4 The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish