Google thinks Ken Thompson doesn't know C

Q: I know Google has a policy where every new employee has to get checked out on languages before they're allowed to check code in. Which means you had to get checked out on C [which you co-created].

Thompson: Yeah, I haven't been.

Q. You haven't been! You're not allowed to check in code?

Thompson: I'm not allowed to check in code, no... I just haven't done it. I've so far found no need to.

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https://www.youtube.com/watch?v=LBdRFWAYkBk