Comment by ctmnt

You’re right, I should have been more careful in my reference to AWS. No need to be snarky about it.

Let me rephrase: aside from that one example from a couple years ago, I haven’t seen any examples of production code written in Lean. I’d be very interested in being proven wrong, this isn’t something I desire, just what I’ve observed. Have you seen any others?

More generally, you implicitly make a good point: writing important libraries in Lean and calling in from another language is probably the most likely use case. So not programs / apps / binaries written in Lean, but small critical components.