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You can get a similar effect in Elixir with # TODO comments if you're using Credo.

It's just a code comment, but by default Credo will exit non-zero if it sees one so if Credo is part of your CI pipeline it will fail it by default.

I'm one of those annoying people who puts # TODO comments all over my code though, so I set Credo so that TODO's wouldn't fail the build.