rustc-ap-rustc_data_structures 21.0.0

Automatically published version of the package `rustc_data_structures` in the rust-lang/rust repository from commit 4e3901d35f6a8652f67111e7272263c9e62ab3e1
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Various data structures used by the Rust compiler. The intention is that code in here should be not be specific to rustc, so that it can be easily unit tested and so forth.

Note

This API is completely unstable and subject to change.