RUSTSEC-2022-0058 (notice) on 2022-09-28: Library exclusively intended to inject UB into safe Rust.

Quoting from the crate description:

This crate is created purely to inject undefined behavior into stable, safe rust.

Specifically, the inconceivable! macro is insta-UB if the ub_inconceivable feature is enabled by any reverse dependency. The value this adds is questionable, and hides unsafe code from naive analysis.

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Crates in the crates.io registry are tarball snapshots uploaded by crates' publishers. The registry is not using crates' git repositories. There is absolutely no guarantee that the repository URL declared by the crate belongs to the crate, or that the code in the repository is the code inside the published tarball.

To review the actual code of the crate, it's best to use cargo crev open inconceivable. Alternatively, you can download the tarball of inconceivable v0.9.0 or view the source online.