RustNL

Precise, consistent, and reliable code coverage by Jynn Nelson. Most existing coverage tools are aimed at "good enough" measurements, where percentages are used as a rough estimate, and the change in percentage is used to determine whether a code change hurts or helps total coverage. For Ferrocene, a safety-certified Rust compiler, rough estimates aren't enough. In this talk I describe how we made coverage precise enough that we can test in CI the exact source code lines that are covered, appli

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