Google's effort to mitigate memory-safety issues

You can use cargo-geiger (https://crates.io/crates/cargo-geiger) to get a report of how much 'unsafe' is used across a whole dependency tree. Unfortunately, the build for geiger is broken right now (https://github.com/rust-secure-code/cargo-geiger/issues/185). There is a workaround noted in the issue. Hopefully it will be fixed in the published version some time soon.