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This action is located at: https://github.com/RustCrypto/actions/blob/master/cross-install/action.yml It's used across the RustCrypto project for installing `cross` in CI. Installation is performed by fetching a pinned binary release from: https://github.com/cross-rs/cross/releases/ This eliminates problems that might occur when using `cargo install` such as: https://github.com/dalek-cryptography/curve25519-dalek/actions/runs/3786735408/jobs/6437902657 It's also marginally faster.