Rust does not appear to "fail fast" for individual tests explains that --fail-fast applies only at the level of cargo test running multiple targets. Each test target, containing potentially many functions, runs to completion, at least if using the normal harness code.

I don't want to change the default but I do think it would be useful to have an option to stop after the first failure within a single test target. For example, cargo mutants really just wants to know if any tests fail.

Do you think there would be any objection in principle to a PR adding an option for this?

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