Here's the score for tokio without tests and examples: $ find . -name '*.rs' | grep -v -e test -e example | xargs -n1 sed '/mod test/q' | grep -v '^\s*//' |

Here's the score for tokio without tests and examples: $ find . -name '*.rs' | grep -v -e test -e example | xargs -n1 sed '/mod test/q' | grep -v '^\s*//' | grep -cF -e '.unwrap(' -e '.expect(' 224 I see a lot of unwrapping of locks. IIRC that only fails if another thread crashed while holding the lock, in which case crashing the current thread is often unobjectionable.