rustc-ap-rustc_cratesio_shim 506.0.0

Automatically published version of the package `rustc_cratesio_shim` in the rust-lang/rust repository from commit a96ba969156d257e5d5b692946fa8fe40ed6543a The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish
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