rustc-ap-rustc_cratesio_shim 257.0.0

Automatically published version of the package `rustc_cratesio_shim` in the rust-lang/rust repository from commit 6ff0b2ed163dab4389d88b14b5729514c11c682e The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish
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