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Having now done some benchmarking, I would like to use shared_memory.
cargo-geiger is a subcommand you can install which will check all the crates in your dependency graph for unsafe blocks and print out a report (which also shows if a crate has #![forbid(unsafe_code)] or not). You can then inspect those crates' sources to judge their use of unsafe for yourself. I don't think it has a "check" mode that simply errors if your dependency graph contains unsafe though, it's more about just collecting that information.
To implement something that cannot be expressed in safe Rust, or at least cannot be expressed succinctly in safe Rust, like fundamental datastructures. The hashbrown crate contains a lot of unsafe code, but it's such high quality that it's now the backing implementation for std::collections::HashMap.
Is there a way for a lexer created with the logos crate (https://crates.io/crates/logos) to get the starting and ending positions for the tokens?
There's an issue on this that was never addressed. Personally I would just add a custom make setup and make test
Considering your question, I recommend reading the Rust book.