rustc-ap-rustc_macros 521.0.0

Automatically published version of the package `rustc_macros` in the rust-lang/rust repository from commit db592f4627251cfd8571a05cf8e06a56be9470c2 The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish
docs.rs failed to build rustc-ap-rustc_macros-521.0.0
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