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Expose `Concurrent` (private type in public i'face) #53410 introduced experimental support for custom test frameworks. Such frameworks may wish to build upon `library/test` by calling into its publicly exposed API (which I entirely understand is wholly unstable). However, any that wish to call `test::run_test` cannot currently do so because `test::options::Concurrent` (the type of its `concurrent` parameter) is not publicly exposed.